RIJNDAEL GUARD v2.56 [FINAL]

[h3kt0r]

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===============================================================================
                        RIJNDAEL GUARD v2.56 (32-BIT)
===============================================================================
 Release Date : September 2026
 Language    : Coded in Native IWBasic 2.5
 Platform    : Windows 7 / 8 / 10 / 11 (x86/x64)
 Category    : Security / File Encryption & Shredding Utility
 Author      : Yannick Dalissier
 Status      : Freeware / Single-File Portable Executable
===============================================================================

 DESCRIPTION:
 ------------
 Compact, high-performance security tool providing hardware-accelerated 256-Bit
 CFB Rijndael encryption, integrated ZLIB stream compression, and SSD-friendly
 Win32 block streaming file shredding in a fully self-contained single file.

 KEY FEATURES:
 -------------
  - 256-Bit CFB Rijndael Engine with AES-NI Hardware Acceleration
  - 1000-Iteration PBKDF2-Style Key Stretching & Dual Offset Header Markers
  - Real-Time ZLIB Stream Compression / Expansion (1 MB / 64 KB Chunk Streaming)
  - SSD-Optimized 1 MB Win32 Block Shredder (Zero-fill with File Truncation)
  - Memory Security with Explicit Buffer Sanitation (WipeBuffer)
  - Embedded Binary PNG Assets via DATA Statements & GDI+ Memory Streams
  - Seamless 3-Panel Sliding Stage Viewport ([About] <-> [Main] <-> [Help])
  - Custom Inline HTML Help Parser & Scrolling Vertical Marquee Engine
  - Native Win32 Double-Buffered Canvas with Overflow-Safe Progress Marquee
  - Native Settings & Window Position Persistence (R256.ini)
  - Full Keyboard Accelerator Navigation (<Ctrl>+A, <Ctrl>+H, <Ctrl>+M, <ESC>)

===============================================================================
    [ 100% Single-File Portable - No Resource Scripts - Zero Storage Footprint ]
===============================================================================

There was an update, and this release is the final version, meaning this program won't be updated anymore.

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===============================================================================
                     RIJNDAEL GUARD - VERSION HISTORY
===============================================================================
[v2.56 - Final] - 2026-09-23
-------------------------------------------------------------------------------
MAJOR HARDWARE ACCELERATION & STREAMING ENGINE OVERHAUL

* Hardware Crypto Engine (Intel AES-NI)
  - Integrated 14-round 256-bit AES-NI hardware vector acceleration via inline
    x86 assembly using raw machine opcode byte emission ($EMIT / db opcodes
    0x66 0x0F 0x38 0xDC / 0xDD).
  - Achieved full hardware processing throughput for CFB-256 block mode,
    bypassing high-frequency software lookup tables and byte-shift emulation.

* Hardware Detection & Reliability (Win32 SEH Probe)
  - Implemented a zero-dependency Structured Exception Handling (SEH) hardware
    probe (ProbeAESNI) via standard 32-bit Win32 TIB chain (FS:[0]).
  - Safely tests raw silicon instruction execution at runtime, correctly
    identifying active hardware pipelines even when masked by BIOS policies,
    hypervisors, or incomplete CPUID feature flags.
  - Guarantees instant, seamless fallback to 32-bit software emulation on legacy
    processors (Core 2 Duo, Pentium IV) with zero crash dialogs.

* Stream Pipeline & I/O Optimizations
  - Expanded primary thread streaming buffer from 64 KB to 1 MB (1,048,576 bytes)
    to leverage native Windows file system read-ahead and write-behind caching.
  - Inlined the 256-bit CFB assembly transformation directly into the stream
    processing loop, eliminating millions of high-frequency subroutine call
    frames and stack setup/teardown cycles.
  - Implemented the `g_aesArgs` global parameter bridge to guarantee thread-safe,
    fail-safe memory operand passes into NASM blocks across all compilation passes.
  - Throttled GUI window invalidations (InvalidateRect) and thread yielding
    to execute strictly on 1% progress boundary changes, freeing the CPU thread
    for unthrottled streaming.

* Performance Metrics (Baseline: Intel Core i7-3520M @ 2.90 GHz)
  - 480 MB File Stream: Reduced encryption/decryption time from ~6 minutes
    (software emulation) down to ~2.8 seconds (AES-NI accelerated).
  - Average CPU Load: Dropped from 25% single-core saturation to <1% idle load.
  - Throughput: Scaled effective I/O processing bandwidth from ~1.32 MB/s up to
    160+ MB/s (bus-speed bound).
   
-------------------------------------------------------------------------------
Version 2.56 [Build Fix] - September 2026
-------------------------------------------------------------------------------
[FIXED] High-Volume Stream Stack Corruption / Crash
        - Resolved an issue where processing large files (>137 MB) caused an
          unhandled access violation and application crash during sustained
          cipher iterations.
        - Cause: Local stack buffer `tmpState` inside `CipherEngine()` was
          vulnerable to index overshoots during shift-row transformations on
          32-bit block configurations, corrupting the call stack over
          millions of loop executions.
        - Fix: Expanded internal `tmpState` scratch buffer allocation and
          implemented strict index boundary clamping (`idx < 64`) prior to
          state assignments.

[OPTIMIZED] Core Cipher Engine Memory Overhead
        - Verified zero-leak memory footprint ($O(1)$ constant spatial complexity)
          holding flat at ~20 MB RAM during multi-gigabyte processing passes.
        - Validated full stream inversion accuracy and byte-for-byte fidelity
          on large ISO container decryption.

-------------------------------------------------------------------------------
And here is the full source-code !

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/*
 * Rijndael Guard - Native GDI+ Skinned Engine (3-Panel Viewport Stage)
 * Target Environment: IWBasic 2.5 + Native GDI+ Flat API + Win32 ZLIB
 * Filename: R256.iwb
 */

AUTODEFINE "Off"

$INCLUDE "windowssdk.inc"
$INCLUDE "gdiplus.inc"

' Link against standard static/import zlib library
$USE "zlib.lib"

' ===============================================================================
' ZLIB 1.2.x DLL EXPORTS & STRUCTURES
' ===============================================================================
TYPE z_stream
    POINTER next_in
    INT     avail_in
    INT     total_in
    POINTER next_out
    INT     avail_out
    INT     total_out
    POINTER msg
    POINTER state
    POINTER zalloc
    POINTER zfree
    POINTER opaque
    INT     data_type
    INT     adler
    INT     reserved
ENDTYPE

CONST Z_OK            = 0
CONST Z_STREAM_END    = 1
CONST Z_NO_FLUSH      = 0
CONST Z_FINISH        = 4
CONST Z_DEFLATED      = 8
CONST MAX_WBITS       = 15

' ===============================================================================
' ZLIB 1.2.x DLL EXPORTS (Strict IWBasic DECLARE CDECL Syntax)
' ===============================================================================
DECLARE CDECL IMPORT, deflateInit2_ ALIAS "deflateInit2_"(strm AS POINTER, level AS INT, method AS INT, windowBits AS INT, memLevel AS INT, strategy AS INT, version AS POINTER, stream_size AS INT), INT
DECLARE CDECL IMPORT, deflate(strm AS POINTER, flush AS INT), INT
DECLARE CDECL IMPORT, deflateEnd(strm AS POINTER), INT
' ===============================================================================
' ZLIB EXTERN DECLARATIONS
' ===============================================================================
DECLARE CDECL EXTERN gzopen(path AS STRING, mode AS STRING), INT
DECLARE CDECL EXTERN gzwrite(gzFile AS INT, buf AS POINTER, length AS INT), INT
DECLARE CDECL EXTERN gzread(gzFile AS INT, buf AS POINTER, length AS INT), INT
DECLARE CDECL EXTERN gzclose(gzFile AS INT), INT
DECLARE CDECL EXTERN gzflush(gzFile AS INT, flush AS INT), INT
' Win32 API Import Alias (Resolves collision with IWBasic LINE command)
DECLARE IMPORT, LineToWin32 ALIAS LineTo(hdc AS UINT, x AS INT, y AS INT), INT
' Unique alias to avoid any language keyword collision
DECLARE IMPORT, Win32ShowWindow ALIAS ShowWindow(hwnd AS UINT, nCmdShow AS INT), INT

' ===============================================================================
' CONSTANTS, CONTROL IDS & VIEWPORT STAGE DEFINITIONS
' ===============================================================================
CONST NCOLS = 8
CONST NKEYS = 8
CONST BLOCKBYTES = 32
CONST KEYBYTES = 32
CONST ROUNDS = 14

' GUI Control IDs
CONST ID_FILE_EDIT     = 11
CONST ID_ZIPFIRST_CHK  = 15
CONST ID_PASS_EDIT     = 21
CONST ID_SHOWPASS_CHK  = 31

' Viewport Panel Identifiers
CONST PAGE_ABOUT = 0
CONST PAGE_MAIN  = 1
CONST PAGE_HELP  = 2

' Viewport Stage Geometry
CONST VIEWPORT_Y      = 65
CONST VIEWPORT_WIDTH  = 440
CONST VIEWPORT_HEIGHT = 278

' Win32 API Custom Constants
CONST INVALID_FILE_ATTRIBUTES = -1

' RGB Color Constants for Hybrid GDI/GDI+ Renderer
CONST RGB_BG_DARK     = 0x170F0B    ' Deep Slate Obsidian (BGR)
CONST RGB_HEADER_BG   = 0x2C1C15    ' Top Banner Glass (BGR)
CONST RGB_EDIT_BG     = 0x2C1C15    ' Dark Input Field Fill (BGR)
CONST RGB_CYAN_ACCENT = 0xF8BD38    ' Cyber Cyan Accent (BGR)
CONST RGB_GOLD_ACCENT = 0x20A5DA    ' Goldenrod Accent (BGR)
CONST RGB_GREEN_BTN   = 0x81B910    ' Protect Green (BGR)
CONST RGB_PANEL_BORDER= 0x3B291E    ' Subdued Border Lines (BGR)
CONST RGB_TEXT_WHITE  = 0xFCFAF8    ' Clean White (BGR)
CONST RGB_TEXT_MUTED  = 0xB8A394    ' Slate Muted (BGR)
CONST RGB_ALERT_RED   = 0x2626DC    ' Flashing Alert Red (BGR)
CONST RGB_BTN_DISABLED= 0x505050    ' Disabled State Dark Grey (BGR)

' ARGB Color Constants for GDI+ Linear Gradients & Rounded Controls (0xAARRGGBB)
CONST ARGB_CYAN_GLOW  = 0xFF38BDF8
CONST ARGB_GOLD_BTN   = 0xFFDAA520
CONST ARGB_HEADER_BG  = 0xFF151C2C
CONST ARGB_EDIT_BG    = 0xFF151C2C
CONST ARGB_FOOTER_TOP = 0xFF1E1510
CONST ARGB_FOOTER_BOT = 0xFF120C08
CONST ARGB_GREEN_BTN  = 0xFF10B981
CONST ARGB_TEXT_WHITE = 0xFFF8FAFC
CONST ARGB_SCANLINE   = 0x12000000  ' Soft semi-transparent black scanline overlay
CONST ARGB_SHADOW_COLOR = 0x50000000' Subtle alpha drop shadow
CONST ARGB_BTN_DISABLED = 0xFF353535' Disabled Button ARGB

' ZLIB Constants
CONST Z_SYNC_FLUSH = 2

' Buffer allocation to 1 MB (1,048,576 bytes)
CONST STREAM_BUF_SIZE = 1048576

' ===============================================================================
' GDI+ & WIN32 STRUCTURES
' ===============================================================================
TYPE GdiplusStartupInput
    INT GdiplusVersion
    POINTER DebugEventCallback
    INT SuppressBackgroundThread
    INT SuppressExternalCodecs
ENDTYPE

TYPE wRECT
    INT left
    INT top
    INT right
    INT bottom
ENDTYPE

TYPE SIZESTRUCT
    INT cx
    INT cy
ENDTYPE

TYPE PAINTSTRUCT
    INT hdc
    INT fErase
    wRECT rcPaint
    INT fRestore
    INT fIncUpdate
    CHAR rgbReserved[32]
ENDTYPE

TYPE LARGE_INTEGER
    INT LowPart
    INT HighPart
ENDTYPE

TYPE THREAD_ARGS
    STRING password
    INT encryptMode
ENDTYPE

' ===============================================================================
' INTERNAL PROGRAM SUBROUTINE DECLARATIONS
' ===============================================================================
DECLARE Handler(), INT
DECLARE CompressFileGzWin32(STRING srcFile, STRING outFile), INT
DECLARE ExpandFileGzWin32(STRING gzFile, STRING outFile), INT
DECLARE GetFileSize64(hFile AS INT), DOUBLE
DECLARE HasSufficientDiskSpace(filePath AS STRING, bytesNeeded AS DOUBLE), INT
DECLARE FastShredFileWin32(STRING filePath, DOUBLE totalBytes)
DECLARE StartWorkerThread(STRING password, INT encryptMode)
DECLARE CheckFileStatusAndMarker(STRING filePath)
DECLARE InitAES_Engine(), INT
DECLARE GenerateTables()
DECLARE xtime(bVal AS INT), INT
DECLARE KeySched()
DECLARE CipherEngine()
DECLARE TestCipherInversion(), INT
DECLARE GetFileNameOnly(fullPath AS STRING), STRING
DECLARE IsSystemPath(fPath AS STRING), INT
DECLARE LogAction(msg AS STRING)
DECLARE SaveLogBufferToDisk()
DECLARE LoadSettings()
DECLARE SaveSettings(lastDir AS STRING)
DECLARE ProcessFileThreaded(password AS STRING, encryptMode AS INT)
DECLARE RenderGDIPlusUI(hdc AS INT)
DECLARE RenderAboutPanel(hdc AS INT)
DECLARE RenderHelpPanel(hdc AS INT)
DECLARE RenderCustomScrollbar(memDC AS UINT, gfx AS POINTER)
DECLARE SlideViewportToPage(INT targetPage)
DECLARE DrawGdiPlusButton(gfx AS POINTER, x AS FLOAT, y AS FLOAT, w AS FLOAT, h AS FLOAT, r AS FLOAT, bgClr AS UINT, borderClr AS UINT, textClr AS UINT, btnText AS STRING, hFont AS UINT, memDC AS UINT)
DECLARE InitGDIPlus(), INT
DECLARE ShutdownGDIPlus()
DECLARE WipeBuffer(buf AS POINTER, size AS INT)
DECLARE StretchKey(password AS STRING, outKeyBuf AS POINTER)
DECLARE SubclassProc(hwnd AS UINT, uMsg AS UINT, wp AS UINT, lp AS UINT), INT
DECLARE EditSubclassProc(hwnd AS UINT, uMsg AS UINT, wp AS UINT, lp AS UINT), INT
DECLARE StripEditBorders(ctrlId AS INT)

' ===============================================================================
' UNIFIED ENCAPSULATED APPLICATION STATE STRUCTURE
' ===============================================================================
TYPE APP_STATE
    WINDOW win

' Window Position Tracking (for INI persistence)
    INT winX
    INT winY

    ' Stage Viewport Panel Offsets & Tracking
    INT activePage      ' 0 = About, 1 = Main (Default), 2 = Help
    INT isAnimating     ' Transition lock flag
    INT stageX          ' Current horizontal stage offset X
   
    ' Heap Allocated Memory Pointers
    POINTER pPwrTab
    POINTER pLogTab
    POINTER pSBox
    POINTER pKeyArray
    POINTER pCFBBuf
    POINTER pDropBuf
    POINTER pLogBuffer

    ' Memory Size & Tracking
    INT logBufSize
    INT logBufUsed
    INT gdiToken
    INT gdiRefCount
    INT isProcessing
    INT hasZlibDll
    INT isProtectedMarker

    ' Win32 Handles & Old WndProcs
    UINT pOldWndProc
    UINT pOldFileEditProc
    UINT pOldPassEditProc
    UINT hEditBrush
    UINT hDarkBrush
    UINT hEditFont

    ' Interactive UI State & Visual Flags
    INT hoverBtn     ' 0=None, 1=Browse, 2=Protect, 3=Restore
    INT hoverLink    ' 0=None, 1=Help, 2=Mail, 3=About
    INT focusedEdit  ' 0=None, 1=File Edit, 2=Pass Edit
    INT progressPos  ' 0 to 100 percentage
    INT alertFlash   ' 1 = Draw Red Alert Marquee, 0 = Normal Marquee
   
    STRING statusMsg
    STRING iniPath
    STRING logPath

    ' Interactive Bounding Rectangles
    wRECT rcLinkHelp
    wRECT rcLinkMail
    wRECT rcLinkAbout

' Custom Help Viewport Scroll State
    INT scrollY         ' Active vertical scroll offset in pixels (0 to maxScrollY)
    INT maxScrollY      ' Maximum scrollable height (Content Height - Viewport Height)
    INT isDraggingThumb ' 1 = User is holding and dragging the scrollbar thumb
    INT dragStartMouseY ' Mouse Y coordinate when thumb drag initiated
    INT dragStartScroll ' Scroll offset when thumb drag initiated
    wRECT rcThumb       ' Active bounding box of the rendered thumb

' Help screen
    POINTER pGpBookIcon
STRING htmlBuf[4000]
    STRING tokenBuf[256]

' About Scroller
INT aboutScrollY ' Vertical offset for About marquee scroller
    STRING aboutText[1024] ' Clean heap allocation for static terminal string
POINTER pGpAboutLogo


INT hasAESNI        ' Hardware detection status
ENDTYPE

' A global symbol for a large buffer and threaded file processing
GLOBAL INT g_aesArgs[5]

' Marquee Credits Array (20 Lines)
GLOBAL STRING g_credits[20]
GLOBAL INT g_creditsCount

' Global Encapsulated Application State Instance
APP_STATE g_app
THREAD_ARGS g_ThreadData

' ===============================================================================
' DISK SPACE PRE-CHECK HELPER
' ===============================================================================

SUB HasSufficientDiskSpace(filePath AS STRING, bytesNeeded AS DOUBLE), INT
    LARGE_INTEGER freeBytes, totalBytes, totalFree
    DOUBLE freeDouble = 0.0
    STRING driveRoot = ""
   
    IF MID$(filePath, 2, 1) = ":" THEN
        driveRoot = LEFT$(filePath, 3)
    ELSE
        driveRoot = GETSTARTPATH
    ENDIF

    IF GetDiskFreeSpaceExA(driveRoot, &freeBytes, &totalBytes, &totalFree) <> 0 THEN
        IF freeBytes.LowPart < 0 THEN
            freeDouble = (4294967296.0 + freeBytes.LowPart) + (freeBytes.HighPart * 4294967296.0)
        ELSE
            freeDouble = freeBytes.LowPart + (freeBytes.HighPart * 4294967296.0)
        ENDIF

        IF freeDouble >= (bytesNeeded * 1.05) THEN RETURN 1
    ENDIF

    RETURN 0
ENDSUB

' ===============================================================================
' FILE STATUS & CRYPTOGRAPHIC MARKER INSPECTOR
' ===============================================================================

SUB CheckFileStatusAndMarker(STRING filePath)
    INT hFile = INVALID_HANDLE_VALUE
    DEF headerBytes[16] AS CHAR
    INT bytesRead = 0
    STRING marker = ""
    INT i

    g_app.isProtectedMarker = 0

    IF LEN(filePath) = 0 THEN RETURN

    IF GetFileAttributesA(filePath) = INVALID_FILE_ATTRIBUTES THEN
        g_app.statusMsg = "Warning: Target file no longer exists on disk!"
        InvalidateRect(g_app.win.hwnd, NULL, 0)
        RETURN
    ENDIF

    hFile = CreateFileA(filePath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFile <> INVALID_HANDLE_VALUE THEN
        ReadFile(hFile, &headerBytes, 16, &bytesRead, 0)
        CloseHandle(hFile)

        IF bytesRead >= 9 THEN
            marker = ""
            FOR i = 0 TO 8
                marker = marker + CHR$(headerBytes[i] & 0xFF)
            NEXT i

            IF marker = "RGUARD256" THEN
                g_app.isProtectedMarker = 1
                g_app.statusMsg = "File Tagged: Already Protected with RGUARD256."
            ELSE
                g_app.statusMsg = "File Tagged: Unprotected Raw Payload."
            ENDIF
        ENDIF
    ENDIF

    InvalidateRect(g_app.win.hwnd, NULL, 0)
ENDSUB

' ===============================================================================
' 64-BIT FILE SIZE HELPER
' ===============================================================================

SUB GetFileSize64(hFile AS INT), DOUBLE
    LARGE_INTEGER liSize
    DOUBLE dblSize = 0.0
   
    IF GetFileSizeEx(hFile, &liSize) <> 0 THEN
        IF liSize.LowPart < 0 THEN
            dblSize = (4294967296.0 + liSize.LowPart) + (liSize.HighPart * 4294967296.0)
        ELSE
            dblSize = liSize.LowPart + (liSize.HighPart * 4294967296.0)
        ENDIF
    ENDIF
   
    RETURN dblSize
ENDSUB

' ===============================================================================
' HIGH-SPEED WIN32 BLOCK SHREDDER (1 MB Streaming Pipeline)
' ===============================================================================
SUB FastShredFileWin32(STRING filePath, DOUBLE totalBytes)
    UINT hFile = INVALID_HANDLE_VALUE
    POINTER pWipeBuf = NULL
    INT wipeChunkSize = 1048576 ' 1 MB High-Throughput Buffer
    UINT bytesWritten = 0
    INT pass, numPasses = 1     ' 1 pass is optimal for SSDs (change to 3 if HDD mandated)
    DOUBLE bytesWiped = 0.0

    ' Allocate 1 MB alignment buffer
    IF ALLOCMEM(pWipeBuf, 1, wipeChunkSize) <> 0 THEN RETURN

    ' Open handle ONCE in unbuffered sequential write mode (FILE_FLAG_SEQUENTIAL_SCAN = 0x08000000)
    hFile = CreateFileA(filePath, GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | 0x08000000, 0)
    IF hFile <> INVALID_HANDLE_VALUE AND hFile <> -1 THEN

        FOR pass = 1 TO numPasses
            g_app.statusMsg = "Sanitizing data ..." '(Pass " + STR$(pass) + "/" + STR$(numPasses) + ")..."
            InvalidateRect(g_app.win.hwnd, NULL, 0)

            ' Fast memory fill using standard zeroing or byte pattern
            ' (Pass 1 = 0x00, Pass 2 = 0xFF, Pass 3 = 0x55)
            CHAR fillVal = 0x00
            IF pass = 2 THEN fillVal = 0xFF
            IF pass = 3 THEN fillVal = 0x55

            ' Fill 1 MB buffer instantly using Win32 API FillMemory
            FillMemory(pWipeBuf, wipeChunkSize, fillVal)

            ' Rewind file pointer to beginning for subsequent passes
            SetFilePointer(hFile, 0, 0, 0) ' 0 = FILE_BEGIN

            bytesWiped = 0.0
            WHILE bytesWiped < totalBytes
                INT toWrite = wipeChunkSize
                IF (totalBytes - bytesWiped) < wipeChunkSize THEN
                    toWrite = INT(totalBytes - bytesWiped)
                ENDIF

                WriteFile(hFile, pWipeBuf, toWrite, &bytesWritten, 0)
                bytesWiped = bytesWiped + toWrite
            ENDWHILE
        NEXT pass

        ' Ensure data is committed to platter/NAND before closing
        FlushFileBuffers(hFile)
        CloseHandle(hFile)

        ' Truncate file length to 0 bytes to destroy file footprint before deletion
        hFile = CreateFileA(filePath, GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
        IF hFile <> INVALID_HANDLE_VALUE AND hFile <> -1 THEN
            SetFilePointer(hFile, 0, 0, 0)
            SetEndOfFile(hFile)
            CloseHandle(hFile)
        ENDIF

        ' Unlink file from file system table
        DeleteFileA(filePath)
    ENDIF

    FREEMEM pWipeBuf
ENDSUB

' ===============================================================================
' NATIVE WIN32 + ZLIB COMPRESSION ENGINE
' ===============================================================================
/*
SUB CompressFileGzWin32(STRING srcFile, STRING outFile), INT
    INT hFileIn = INVALID_HANDLE_VALUE
    INT gzHandle = 0
    POINTER memChunk = NULL
    INT chunkSize = 65536
    DOUBLE fileLen = 0.0
    DOUBLE bytesReadTotal = 0.0
    INT bytesRead = 0
    INT res = 0
    INT flushCounter = 0

    hFileIn = CreateFileA(srcFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFileIn = INVALID_HANDLE_VALUE THEN RETURN 0

    fileLen = GetFileSize64(hFileIn)
    IF fileLen <= 0.0 THEN
        CloseHandle(hFileIn)
        RETURN 0
    ENDIF

    IF ALLOCMEM(memChunk, 1, chunkSize) <> 0 THEN
        CloseHandle(hFileIn)
        RETURN 0
    ENDIF

    DELETEFILE outFile
    gzHandle = gzopen(outFile, "wb9")
    IF gzHandle = 0 THEN
        FREEMEM memChunk
        CloseHandle(hFileIn)
        RETURN 0
    ENDIF

    DO
        bytesRead = 0
        res = ReadFile(hFileIn, memChunk, chunkSize, &bytesRead, NULL)
        IF (res <> 0) AND (bytesRead > 0) THEN
            gzwrite(gzHandle, memChunk, bytesRead)
            bytesReadTotal = bytesReadTotal + bytesRead
           
            flushCounter++
            IF flushCounter >= 1024 THEN
                gzflush(gzHandle, Z_SYNC_FLUSH)
                flushCounter = 0
            ENDIF
        ENDIF
    UNTIL (res = 0) OR (bytesRead = 0)

    CloseHandle(hFileIn)
    gzclose(gzHandle)
    FREEMEM memChunk

    RETURN 1
ENDSUB
*/
SUB ExpandFileGzWin32(STRING gzFile, STRING outFile), INT
    INT hFileOut = INVALID_HANDLE_VALUE
    INT hFileGz = INVALID_HANDLE_VALUE
    INT gzHandle = 0
    POINTER memChunk = NULL
    INT chunkSize = 65536
    INT bytesRead = 0
    INT bytesWritten = 0
   
    ' Overflow-safe variables (in KB)
    INT totalGzKB = 0, totalReadKB = 0
    INT totalGzSize = 0, totalRead = 0, currentPercent = 0

    ' 1. Fetch compressed file size
    hFileGz = CreateFileA(gzFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFileGz <> INVALID_HANDLE_VALUE THEN
        totalGzSize = GetFileSize(hFileGz, NULL)
        CloseHandle(hFileGz)
    ENDIF

    ' Convert to KB to prevent totalRead * 100 integer overflow on files > 20 MB
    totalGzKB = totalGzSize / 1024

    ' 2. Open GZIP stream via ZLIB
    gzHandle = gzopen(gzFile, "rb")
    IF gzHandle = 0 THEN RETURN 0

    ' 3. Allocate 64 KB streaming buffer
    IF ALLOCMEM(memChunk, 1, chunkSize) <> 0 THEN
        gzclose(gzHandle)
        RETURN 0
    ENDIF

    ' 4. Create output destination file
    hFileOut = CreateFileA(outFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFileOut = INVALID_HANDLE_VALUE THEN
        FREEMEM memChunk
        gzclose(gzHandle)
        RETURN 0
    ENDIF

    ' 5. Decompress stream with overflow-safe percentage calculations
    DO
        bytesRead = gzread(gzHandle, memChunk, chunkSize)
        IF bytesRead > 0 THEN
            WriteFile(hFileOut, memChunk, bytesRead, &bytesWritten, NULL)

            totalRead = totalRead + bytesRead
            totalReadKB = totalRead / 1024

            ' Compute overflow-safe 0-100 percentage
            IF totalGzKB > 0 THEN
                currentPercent = (totalReadKB * 100) / totalGzKB
            ELSEIF totalGzSize > 0 THEN
                currentPercent = (totalRead * 100) / totalGzSize
            ENDIF

            ' Strictly clamp bounds between 0 and 100
            IF currentPercent < 0 THEN currentPercent = 0
            IF currentPercent > 100 THEN currentPercent = 100

            ' Update UI progress bar and status marquee message
            IF currentPercent <> g_app.progressPos THEN
                g_app.progressPos = currentPercent
                g_app.statusMsg = "Expanding ZLIB Payload... " + STR$(currentPercent) + "%"
               
                ' Force immediate repaint of window canvas
                InvalidateRect(g_app.win.hwnd, NULL, 0)
                UpdateWindow(g_app.win.hwnd)
            ENDIF
        ENDIF
    UNTIL bytesRead <= 0

    ' Cleanup
    CloseHandle(hFileOut)
    FREEMEM memChunk
    gzclose(gzHandle)

    RETURN 1
ENDSUB

' ===============================================================================
' PERSISTENT SETTINGS & IN-MEMORY DEFERRED LOGGING ROUTINES
' ===============================================================================

SUB LogAction(msg AS STRING)
    STRING entryStr
    INT strLen
    POINTER pTarget

    ' 1. Custom ISO-style timestamp formatting via IWBasic DATE$
    entryStr = "[" + DATE$("yyyy-MM-dd") + " " + TIME$ + "] " + msg + "\r\n"
    strLen = LEN(entryStr)

    ' 2. Fast heap buffer copy without character-by-character loop overhead
    IF g_app.pLogBuffer <> NULL AND (g_app.logBufUsed + strLen) < g_app.logBufSize THEN
        pTarget = g_app.pLogBuffer + g_app.logBufUsed
       
        ' Direct block copy into heap memory
        #<STRING>pTarget = entryStr
       
        ' Advance position index
        g_app.logBufUsed = g_app.logBufUsed + strLen
    ENDIF
ENDSUB

SUB SaveLogBufferToDisk()
    UINT hFile
    UINT bytesWritten
    STRING szPath
    POINTER pBuf

    IF g_app.pLogBuffer <> NULL AND g_app.logBufUsed > 0 THEN
        ' Assign to local pointer
        pBuf = g_app.pLogBuffer

        IF LEN(g_app.logPath) > 0 THEN
            szPath = g_app.logPath
        ELSE
            szPath = GETSTARTPATH + "R256.log"
        ENDIF

        ' Open file in append mode (GENERIC_WRITE = 0x40000000, OPEN_ALWAYS = 4)
        hFile = CreateFileA(szPath, 0x40000000, 1, 0, 4, 0x80, 0)
       
        IF hFile <> 0 AND hFile <> -1 THEN
            ' Seek to end of file (FILE_END = 2)
            SetFilePointer(hFile, 0, 0, 2)
           
            ' Write raw heap buffer to disk
            WriteFile(hFile, pBuf, g_app.logBufUsed, &bytesWritten, 0)
            CloseHandle(hFile)
           
            g_app.logBufUsed = 0
        ENDIF
    ENDIF
ENDSUB

' ===============================================================================
' STACKNOTES-STYLE INI PARSER FOR R256
' ===============================================================================
SUB LoadSettings()
    FILE inifile
    STRING regel, value
    STRING r256Path = GETSTARTPATH
    STRING iniPath = r256Path + "R256.ini"
   
    STRING loadedPath = ""
    INT winX = -9999, winY = -9999

    IF OPENFILE(inifile, iniPath, "R") = 0 THEN
        WHILE EOF(inifile) = 0
            READ inifile, value
            regel = LTRIM$(RTRIM$(value))
            value = "0"

            ' Split Key=Value pair at '='
            IF INSTR(regel, "=") <> 0 THEN
                value = RIGHT$(regel, LEN(regel) - INSTR(regel, "="))
                value = LTRIM$(RTRIM$(value))
            ENDIF

            ' Parse R256 key tags
            IF INSTR(regel, "[LastDir]") <> 0 THEN loadedPath = value
            IF INSTR(regel, "[WinX]") > 0 THEN winX = VAL(value)
            IF INSTR(regel, "[WinY]") > 0 THEN winY = VAL(value)
        ENDWHILE

        CLOSEFILE inifile
  ' messagebox 0, loadedPath, "debug",0|80
        ' Apply target file path to UI edit box
        IF LEN(loadedPath) > 0 THEN
            SETCONTROLTEXT(g_app.win, ID_FILE_EDIT, loadedPath)
            CheckFileStatusAndMarker(loadedPath)
            g_app.statusMsg = "Restored last target path from settings."
            LogAction("Persisted path loaded from R256.ini: " + loadedPath)
        ENDIF

        ' Apply window position if valid
        IF winX > -9000 AND winY > -9000 THEN
            SetWindowPos(g_app.win.hwnd, 0, winX, winY, 0, 0, SWP_NOSIZE | SWP_NOZORDER)
            LogAction("Restored window position to: X=" + STR$(winX) + ", Y=" + STR$(winY))
        ENDIF
    ENDIF
ENDSUB

' ===============================================================================
' FAIL-SAFE APP SETTINGS SAVER
' Reads directly from ID_FILE_EDIT control and persists state to R256.ini
' ===============================================================================
SUB SaveSettings(lastDir AS STRING)
    FILE inifile
    wRECT rcWin
    STRING targetPath = lastDir
    STRING iniPath = GETSTARTPATH + "R256.ini"


    targetPath = GETCONTROLTEXT(g_app.win, ID_FILE_EDIT)
' messagebox 0, targetpath, "debug",0|80

    IF OPENFILE(inifile, iniPath, "W") = 0 THEN
        WRITE inifile, "[Configuration]"
        WRITE inifile, "[LastDir]=" + targetPath

        IF g_app.win.hwnd <> 0 AND GetWindowRect(g_app.win.hwnd, &rcWin) <> 0 THEN
            IF rcWin.left > -10000 AND rcWin.top > -10000 THEN
                WRITE inifile, "[WinX]=" + STR$(rcWin.left)
                WRITE inifile, "[WinY]=" + STR$(rcWin.top)
            ELSE
                WRITE inifile, "[WinX]=0"
                WRITE inifile, "[WinY]=0"
            ENDIF
        ELSE
            WRITE inifile, "[WinX]=0"
            WRITE inifile, "[WinY]=0"
        ENDIF

        CLOSEFILE inifile
        LogAction("Saved settings to R256.ini")
    ENDIF
ENDSUB
' ===============================================================================
' SECURE MEMORY SANITIZATION & KEY STRETCHING HELPERS
' ===============================================================================

SUB WipeBuffer(buf AS POINTER, size AS INT)
    INT i
    IF buf <> NULL AND size > 0 THEN
        FOR i = 0 TO size - 1
            #<CHAR>(buf + i) = 0
        NEXT i
    ENDIF
ENDSUB

SUB xtime(bVal AS INT), INT
    INT res = ((bVal & 0xFF) << 1) & 0xFF
    IF (bVal & 0x80) THEN res = (res || 0x1B) & 0xFF
    RETURN res & 0xFF
ENDSUB

SUB GenerateTables()
    INT i, p = 1, x, q, logVal
    POINTER pPwr, pLog, pSBox
   
    FOR i = 0 TO 255
        pPwr = g_app.pPwrTab + i
        pLog = g_app.pLogTab + (p & 0xFF)
       
        #<CHAR>pPwr = p & 0xFF
        #<CHAR>pLog = i & 0xFF
        p = (p || xtime(p)) & 0xFF
    NEXT i

    FOR i = 0 TO 255
        IF i = 0 THEN
            p = 0
        ELSE
            pLog = g_app.pLogTab + i
            logVal = #<CHAR>pLog & 0xFF
            logVal = (255 - logVal) % 255
            IF logVal < 0 THEN logVal = logVal + 255
           
            pPwr = g_app.pPwrTab + logVal
            p = #<CHAR>pPwr & 0xFF
        ENDIF
       
        q = p
        FOR x = 1 TO 4
            q = (((q << 1) & 0xFF) | ((q >> 7) & 0xFF)) & 0xFF
            p = (p || q) & 0xFF
        NEXT x
       
        pSBox = g_app.pSBox + i
        #<CHAR>pSBox = (p || 0x63) & 0xFF
    NEXT i
ENDSUB

SUB StretchKey(password AS STRING, outKeyBuf AS POINTER)
    DEF salt[16] AS CHAR
    DEF workingKey[32] AS CHAR
    INT i, iter, pwdLen = LEN(password)
    INT mixVal, sIdx, kIdx
    POINTER pSBoxByte, pOutByte

    salt[0] = 0x52 : salt[1] = 0x69 : salt[2] = 0x6A : salt[3] = 0x6E
    salt[4] = 0x64 : salt[5] = 0x61 : salt[6] = 0x65 : salt[7] = 0x6C
    salt[8] = 0x53 : salt[9] = 0x61 : salt[10]= 0x74 : salt[11]= 0x32
    salt[12]= 0x35 : salt[13]= 0x36 : salt[14]= 0x21 : salt[15]= 0x21

    FOR i = 0 TO KEYBYTES - 1
        IF i < pwdLen THEN
            workingKey[i] = ASC(MID$(password, i + 1, 1)) || salt[i % 16]
        ELSE
            workingKey[i] = salt[i % 16]
        ENDIF
    NEXT i

    FOR iter = 1 TO 1000
        FOR i = 0 TO KEYBYTES - 1
            kIdx = (i + iter) % 32
            sIdx = (i + iter) % 16
            mixVal = workingKey[kIdx] & 0xFF
            mixVal = xtime(mixVal || salt[sIdx]) & 0xFF
           
            pSBoxByte = g_app.pSBox + mixVal
            workingKey[i] = (#<CHAR>pSBoxByte & 0xFF) || workingKey[i]
        NEXT i
    NEXT iter

    FOR i = 0 TO KEYBYTES - 1
        pOutByte = outKeyBuf + i
        #<CHAR>pOutByte = workingKey[i] & 0xFF
    NEXT i

    WipeBuffer(&workingKey, 32)
    WipeBuffer(&salt, 16)
ENDSUB

' ===============================================================================
' CORE AES MATH & CIPHER ENGINE
' ===============================================================================

SUB InitAES_Engine(), INT
    ALLOCMEM(g_app.pPwrTab, 256, 1)
    ALLOCMEM(g_app.pLogTab, 256, 1)
    ALLOCMEM(g_app.pSBox, 256, 1)
    ALLOCMEM(g_app.pKeyArray, 2048, 1)
    ALLOCMEM(g_app.pCFBBuf, 128, 1)
    ALLOCMEM(g_app.pDropBuf, 1024, 1)
   
    IF g_app.pPwrTab = NULL OR g_app.pLogTab = NULL OR g_app.pSBox = NULL OR g_app.pKeyArray = NULL OR g_app.pCFBBuf = NULL OR g_app.pDropBuf = NULL THEN RETURN 0
   
    GenerateTables()
    RETURN 1
ENDSUB

SUB KeySched()
    INT dl = 1, i, al, bx, keyColumn
    POINTER pKey, pSBoxByte, pPrevKey
   
    pKey = g_app.pKeyArray + KEYBYTES

    FOR i = 0 TO 447
        keyColumn = i % 32
       
        bx = -4
        IF keyColumn = 3 THEN bx = -3

        pPrevKey = pKey + bx
        al = #<CHAR>pPrevKey & 0xFF

        IF keyColumn = 0 THEN
            pSBoxByte = g_app.pSBox + al
            al = #<CHAR>pSBoxByte & 0xFF
            al = (al || dl) & 0xFF
            dl = xtime(dl)
        ELSEIF keyColumn = 16 THEN
            pSBoxByte = g_app.pSBox + al
            al = #<CHAR>pSBoxByte & 0xFF
        ENDIF

        pPrevKey = pKey - KEYBYTES
        al = (al || (#<CHAR>pPrevKey & 0xFF)) & 0xFF
        #<CHAR>pKey = al & 0xFF

        pKey++
    NEXT i
ENDSUB

' ===============================================================================
' HARDWARE PROBE VIA STRUCTURED EXCEPTION HANDLING (SEH)
' Attempts to execute a single aesenc instruction on dummy memory.
' Returns 1 if hardware executes it, 0 if an illegal instruction exception fires.
' ===============================================================================
SUB IsAESNI_Supported(), INT
    INT isHWSupported = 0

    _asm
        push ebx
        push ecx
        push edx

        ; Reserve 32 bytes on stack for dummy XMM memory test
        sub esp, 32
        mov eax, esp

        ; Set up Win32 32-bit SEH Exception Frame
        push dword _seh_handler     ; Pointer to exception recovery handler
        push dword [fs:0]           ; Pointer to previous SEH frame head
        mov dword [fs:0], esp       ; Install our frame as active head

        ; --- PROBE TEST INSTRUCTION ---
        movdqu xmm0, [eax]
        movdqu xmm1, [eax + 16]
       
        ; Raw hex opcodes for: aesenc xmm0, xmm1
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        ; Execution succeeded! CPU executed aesenc without throwing an exception.
        mov dword [ebp - 4], 1      ; First local variable (isHWSupported) sits at [ebp - 4]
        jmp _seh_cleanup

    _seh_handler:
        ; --- EXCEPTION RECOVERY ROUTINE ---
        ; Triggered if STATUS_ILLEGAL_INSTRUCTION (0xC000001D) occurs.
        mov ecx, dword [esp + 12]   ; ECX = ContextRecord pointer
       
        ; Redirect EIP in ContextRecord to resume execution at _seh_fail
        mov dword [ecx + 0xB8], _seh_fail  ; 0xB8 = EIP offset in 32-bit CONTEXT struct
       
        xor eax, eax                ; ExceptionContinueExecution = 0
        ret

    _seh_fail:
        ; Exception caught: CPU lacks active AES-NI execution pipeline
        mov dword [ebp - 4], 0

    _seh_cleanup:
        ; Restore original SEH chain head
        pop dword [fs:0]
        add esp, 4                  ; Drop handler pointer
        add esp, 32                 ; Clean up dummy stack memory

        pop edx
        pop ecx
        pop ebx
    _endasm

    RETURN isHWSupported
ENDSUB

' ===============================================================================
' AES-NI HARDWARE BLOCK ENCRYPTION (256-BIT)
' Encrypts a single 16-byte block in-place using CPU hardware instructions.
'
' Parameters:
'   pBlock : POINTER to 16 bytes of input plaintext (overwritten with ciphertext)
'   pKey   : POINTER to expanded key array (240 bytes / 15 round keys)
' ===============================================================================
SUB AESNI_EncryptBlock(POINTER pBlock, POINTER pKey)
    IF pBlock = NULL OR pKey = NULL THEN RETURN

    POINTER pDataBlock = pBlock
    POINTER pKeyData = pKey

    _asm
        push eax
        push edx

        ; Fetch parameters directly from the IWBasic stack frame (EBP + offset)
        ; [ebp + 8]  = 1st parameter (pBlock)
        ; [ebp + 12] = 2nd parameter (pKey)
        mov eax, dword [ebp + 8]
        mov edx, dword [ebp + 12]

        ; 1. Load 16-byte data block into XMM0 register
        movdqu xmm0, [eax]

        ; 2. Initial Round Key XOR (AddRoundKey)
        movdqu xmm1, [edx]
        pxor xmm0, xmm1

        ; 3. Rounds 1 to 13 (Hardware SubBytes + ShiftRows + MixColumns + AddRoundKey)
  movdqu xmm1, [edx + 16]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 32]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 48]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 64]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 80]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 96]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 112]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 128]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 144]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 160]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 176]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 192]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        movdqu xmm1, [edx + 208]
        db 0x66, 0x0F, 0x38, 0xDC, 0xC1

        ; 4. Final Round 14 (aesenclast xmm0, xmm1 -> 66 0F 38 DD C1)
        movdqu xmm1, [edx + 224]
        db 0x66, 0x0F, 0x38, 0xDD, 0xC1

        ; 5. Write encrypted 16-byte ciphertext back to pBlock
        movdqu [eax], xmm0

        ; Restore general registers
        pop edx
        pop eax
    _endasm
ENDSUB

SUB CipherEngine()
    INT round, i, c, r, shift, a, b, d, e, bVal, idx
    POINTER pRK, pCFBByte, pSBoxByte, pRKByte
    DEF tmpState[64] AS CHAR ' Expanded to 64 bytes for safety against index overshoot

    ' If CPU supports AES-NI, execute hardware pipeline
    IF g_app.hasAESNI THEN
        AESNI_EncryptBlock(g_app.pCFBBuf, g_app.pKeyArray)
    ELSE
        ' Software Emulation Fallback
        pRK = g_app.pKeyArray

        FOR i = 0 TO BLOCKBYTES - 1
            pCFBByte = g_app.pCFBBuf + i
            pRKByte = pRK + i
            bVal = ((#<CHAR>pCFBByte & 0xFF) || (#<CHAR>pRKByte & 0xFF)) & 0xFF
            pSBoxByte = g_app.pSBox + bVal
            #<CHAR>pCFBByte = #<CHAR>pSBoxByte & 0xFF
        NEXT i

        FOR round = 1 TO ROUNDS - 1
            pRK = g_app.pKeyArray + (round * BLOCKBYTES)

            FOR r = 0 TO 3
                IF r = 0 THEN shift = 0
                IF r = 1 THEN shift = 1
                IF r = 2 THEN shift = 3
                IF r = 3 THEN shift = 4

                FOR c = 0 TO NCOLS - 1
                    pCFBByte = g_app.pCFBBuf + r + (c * 4)
                    idx = r + (((c + shift) % NCOLS) * 4)
                    IF idx >= 0 AND idx < 64 THEN
                        tmpState[idx] = #<CHAR>pCFBByte & 0xFF
                    ENDIF
                NEXT c
            NEXT r

            FOR i = 0 TO BLOCKBYTES - 1
                pCFBByte = g_app.pCFBBuf + i
                #<CHAR>pCFBByte = tmpState[i] & 0xFF
            NEXT i

            FOR c = 0 TO NCOLS - 1
                i = c * 4
                pCFBByte = g_app.pCFBBuf + i
                a = #<CHAR>pCFBByte & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 1
                b = #<CHAR>pCFBByte & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 2
                d = #<CHAR>pCFBByte & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 3
                e = #<CHAR>pCFBByte & 0xFF

                pCFBByte = g_app.pCFBBuf + i
                #<CHAR>pCFBByte = (xtime(a) || (xtime(b) || b) || d || e) & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 1
                #<CHAR>pCFBByte = (a || xtime(b) || (xtime(d) || d) || e) & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 2
                #<CHAR>pCFBByte = (a || b || xtime(d) || (xtime(e) || e)) & 0xFF
               
                pCFBByte = g_app.pCFBBuf + i + 3
                #<CHAR>pCFBByte = ((xtime(a) || a) || b || d || xtime(e)) & 0xFF
            NEXT c

            FOR i = 0 TO BLOCKBYTES - 1
                pCFBByte = g_app.pCFBBuf + i
                pRKByte = pRK + i
                bVal = ((#<CHAR>pCFBByte & 0xFF) || (#<CHAR>pRKByte & 0xFF)) & 0xFF
                pSBoxByte = g_app.pSBox + bVal
                #<CHAR>pCFBByte = #<CHAR>pSBoxByte & 0xFF
            NEXT i
        NEXT round

        pRK = g_app.pKeyArray + (ROUNDS * BLOCKBYTES)
        FOR i = 0 TO BLOCKBYTES - 1
            pCFBByte = g_app.pCFBBuf + i
            pRKByte = pRK + i
            #<CHAR>pCFBByte = ((#<CHAR>pCFBByte & 0xFF) || (#<CHAR>pRKByte & 0xFF)) & 0xFF
        NEXT i

        WipeBuffer(&tmpState, 64)
    ENDIF
ENDSUB

SUB TestCipherInversion(), INT
    DEF testData[32] AS CHAR
    DEF origData[32] AS CHAR
    DEF nextCFB[32] AS CHAR
    STRING pwd = "TestPassword"
    INT i
    POINTER pCFBByte

    FOR i = 0 TO 31
        testData[i] = (i + 65) & 0xFF
        origData[i] = testData[i]
    NEXT i

    StretchKey(pwd, g_app.pKeyArray)
    FOR i = 0 TO 31
        pCFBByte = g_app.pCFBBuf + i
        #<CHAR>pCFBByte = 0x41
    NEXT i
    KeySched()

    CipherEngine()
    FOR i = 0 TO 31
        pCFBByte = g_app.pCFBBuf + i
        INT bInE = testData[i] & 0xFF
        INT bOutE = (bInE || (#<CHAR>pCFBByte & 0xFF)) & 0xFF
        testData[i] = bOutE
        nextCFB[i] = bOutE
    NEXT i

    StretchKey(pwd, g_app.pKeyArray)
    FOR i = 0 TO 31
        pCFBByte = g_app.pCFBBuf + i
        #<CHAR>pCFBByte = 0x41
    NEXT i
    KeySched()

    CipherEngine()
    FOR i = 0 TO 31
        pCFBByte = g_app.pCFBBuf + i
        INT bInD = testData[i] & 0xFF
        INT bOutD = (bInD || (#<CHAR>pCFBByte & 0xFF)) & 0xFF
        testData[i] = bOutD
    NEXT i

    FOR i = 0 TO 31
        IF testData[i] <> origData[i] THEN RETURN 0
    NEXT i

    WipeBuffer(g_app.pKeyArray, 2048)
    WipeBuffer(g_app.pCFBBuf, 128)
    WipeBuffer(&testData, 32)
    WipeBuffer(&origData, 32)
    WipeBuffer(&nextCFB, 32)

    RETURN 1
ENDSUB

' ===============================================================================
' WIN32 BORDER STRIPPING SUBROUTINE
' ===============================================================================

SUB StripEditBorders(ctrlId AS INT)
    UINT hwndCtrl, styleVal, exStyleVal
   
    hwndCtrl = GETCONTROLHANDLE(g_app.win, ctrlId)
    IF hwndCtrl = 0 THEN RETURN

    styleVal = GetWindowLongA(hwndCtrl, GWL_STYLE)
    styleVal = styleVal & (~WS_BORDER)
    SetWindowLongA(hwndCtrl, GWL_STYLE, styleVal)

    exStyleVal = GetWindowLongA(hwndCtrl, GWL_EXSTYLE)
    exStyleVal = exStyleVal & (~WS_EX_CLIENTEDGE)
    SetWindowLongA(hwndCtrl, GWL_EXSTYLE, exStyleVal)

    SetWindowPos(hwndCtrl, 0, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | 0x0010)
ENDSUB

' ===============================================================================
' EDIT CONTROL SUBCLASS WNDPROC
' ===============================================================================

SUB EditSubclassProc(hwnd AS UINT, uMsg AS UINT, wp AS UINT, lp AS UINT), INT
    UINT oldProc
   
    IF hwnd = GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT) THEN
        oldProc = g_app.pOldFileEditProc
    ELSE
        oldProc = g_app.pOldPassEditProc
    ENDIF

    SELECT uMsg
        CASE WM_KEYDOWN
            ' Esc & Hotkey forwarding
            IF wp = 0x1B OR (GetKeyState(0x11) & 0x8000) THEN
                SendMessageA(g_app.win.hwnd, WM_KEYDOWN, wp, lp)
                RETURN 0
            ENDIF

            ' Forward Viewport Navigation Keys when on Help Page
            IF g_app.activePage = PAGE_HELP THEN
                IF wp = 0x21 OR wp = 0x22 OR wp = 0x26 OR wp = 0x28 OR wp = 0x24 OR wp = 0x23 THEN
                    SendMessageA(g_app.win.hwnd, WM_KEYDOWN, wp, lp)
                    RETURN 0
                ENDIF
            ENDIF

        CASE WM_SETFOCUS
            IF hwnd = GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT) THEN
                g_app.focusedEdit = 1
            ELSE
                g_app.focusedEdit = 2
            ENDIF
            InvalidateRect(g_app.win.hwnd, NULL, 0)

        CASE WM_KILLFOCUS
            g_app.focusedEdit = 0
            InvalidateRect(g_app.win.hwnd, NULL, 0)
    ENDSELECT

    RETURN CallWindowProcA(oldProc, hwnd, uMsg, wp, lp)
ENDSUB

' ===============================================================================
' GDI+ LIFECYCLE MANAGEMENT
' ===============================================================================

SUB InitGDIPlus(), INT
    IF g_app.gdiRefCount = 0 THEN
        GdiplusStartupInput gdipInput
        gdipInput.GdiplusVersion = 1
        gdipInput.DebugEventCallback = NULL
        gdipInput.SuppressBackgroundThread = 0
        gdipInput.SuppressExternalCodecs = 0
       
        IF GdiplusStartup(&g_app.gdiToken, &gdipInput, NULL) <> 0 THEN RETURN 0
    ENDIF
    g_app.gdiRefCount = g_app.gdiRefCount + 1
    RETURN 1
ENDSUB

SUB ShutdownGDIPlus()
    IF g_app.gdiRefCount > 0 THEN
        g_app.gdiRefCount = g_app.gdiRefCount - 1
        IF g_app.gdiRefCount = 0 AND g_app.gdiToken <> 0 THEN
            GdiplusShutdown(g_app.gdiToken)
            g_app.gdiToken = 0
        ENDIF
    ENDIF
ENDSUB

' ===============================================================================
' GDI+ ROUNDED BUTTON VECTOR HELPER
' ===============================================================================

SUB DrawGdiPlusButton(gfx AS POINTER, x AS FLOAT, y AS FLOAT, w AS FLOAT, h AS FLOAT, r AS FLOAT, bgClr AS UINT, borderClr AS UINT, textClr AS UINT, btnText AS STRING, hFont AS UINT, memDC AS UINT)
    POINTER pPath = NULL, pBrush = NULL, pPen = NULL
    FLOAT diameter = r * 2.0
    wRECT rcText

    GdipCreatePath(0, &pPath)
    IF pPath <> NULL THEN
        GdipAddPathArc(pPath, x, y, diameter, diameter, 180.0, 90.0)
        GdipAddPathArc(pPath, x + w - diameter, y, diameter, diameter, 270.0, 90.0)
        GdipAddPathArc(pPath, x + w - diameter, y + h - diameter, diameter, diameter, 0.0, 90.0)
        GdipAddPathArc(pPath, x, y + h - diameter, diameter, diameter, 90.0, 90.0)
        GdipClosePathFigure(pPath)
        GdipCreateSolidFill(bgClr, &pBrush)
        IF pBrush <> NULL THEN
            GdipFillPath(gfx, pBrush, pPath)
            GdipDeleteBrush(pBrush)
        ENDIF
        GdipCreatePen1(borderClr, 1.2, 2, &pPen)
        IF pPen <> NULL THEN
            GdipDrawPath(gfx, pPen, pPath)
            GdipDeletePen(pPen)
        ENDIF
        GdipDeletePath(pPath)
    ENDIF

    rcText.left = INT(x) : rcText.top = INT(y) : rcText.right = INT(x + w) : rcText.bottom = INT(y + h)
    SetBkMode(memDC, 1)
    SetTextColor(memDC, textClr)
    SelectObject(memDC, hFont)
    DrawTextA(memDC, btnText, -1, &rcText, 0x00000025)
ENDSUB

' ===============================================================================
' VIEWPORT STAGE PANELS: PANEL 0 (ABOUT) & PANEL 2 (CATFOOD GDI HELP)
' ===============================================================================
' CENTERED VERTICAL MARQUEE ABOUT PANEL (Starts directly at Bottom Edge)
' ===============================================================================
SUB RenderAboutPanel(hdc AS INT)
    UINT hFontHeader, hFontBody, hOldFont
    wRECT rcLine
    INT startY = 0, currentY = 0, lineH = 18, count = 0
    UINT txtColor = RGB_TEXT_WHITE

    ' GDI+ Gradient Overlay Pointers
    POINTER pGfx = NULL, pTopBrush = NULL, pBtmBrush = NULL
    POINTL pt1, pt2
    UINT colSolidDark, colTransDark

    ' Logo positioning dimensions
    INT logoW = 220, logoH = 39
    INT logoPadding = 1  ' Gap between logo and first text line
    INT logoX = 0, logoY = 0

    ' 1. Lock GDI drawing strictly inside About Viewport bounds
    SaveDC(hdc)
    IntersectClipRect(hdc, 0, VIEWPORT_Y, VIEWPORT_WIDTH, VIEWPORT_Y + VIEWPORT_HEIGHT)

    ' Baseline startY = top edge of the entire scroll block (the logo top)
    ' When aboutScrollY = 0, logoY sits EXACTLY at the bottom edge of the viewport
    startY = (VIEWPORT_Y + VIEWPORT_HEIGHT) - g_app.aboutScrollY

    logoY = startY
    logoX = (VIEWPORT_WIDTH - logoW) / 2

    ' Text starts directly below logo + padding
    currentY = startY + logoH + logoPadding

    ' 2. Initialize Single GDI+ Graphics Object for whole frame
    GdipCreateFromHDC(hdc, &pGfx)

    ' Draw Logo
    IF pGfx <> NULL AND g_app.pGpAboutLogo <> NULL THEN
        IF (logoY + logoH) > VIEWPORT_Y AND logoY < (VIEWPORT_Y + VIEWPORT_HEIGHT) THEN
            GdipDrawImageRectI(pGfx, g_app.pGpAboutLogo, logoX, logoY, logoW, logoH)
        ENDIF
    ENDIF

    ' 3. Render Marquee Text Array
    hFontHeader = CreateFontA(-14, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")
    hFontBody   = CreateFontA(-12, 0, 0, 0, 400, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")

    SetBkMode(hdc, 1) ' TRANSPARENT

    FOR count = 0 TO (g_creditsCount - 1)
        IF LEN(g_credits[count]) > 0 THEN
            IF count = 0 THEN
                txtColor = RGB_CYAN_ACCENT
                hOldFont = SelectObject(hdc, hFontHeader)
            ELSEIF count = 1 OR count = 13 THEN
                txtColor = RGB_GOLD_ACCENT
                hOldFont = SelectObject(hdc, hFontHeader)
            ELSEIF count = 3 OR count = 8 OR count = 12 THEN
                txtColor = RGB_TEXT_MUTED
                hOldFont = SelectObject(hdc, hFontBody)
            ELSEIF count = 9 OR count = 10 THEN
                txtColor = RGB_CYAN_ACCENT
                hOldFont = SelectObject(hdc, hFontBody)
            ELSEIF count = 17 THEN
                txtColor = RGB_TEXT_MUTED
                hOldFont = SelectObject(hdc, hFontBody)
            ELSE
                txtColor = RGB_TEXT_WHITE
                hOldFont = SelectObject(hdc, hFontBody)
            ENDIF

            SetTextColor(hdc, txtColor)

            rcLine.left = 10
            rcLine.top = currentY
            rcLine.right = VIEWPORT_WIDTH - 10
            rcLine.bottom = currentY + lineH + 2

            DrawTextA(hdc, g_credits[count], -1, &rcLine, 0x00000801)

            SelectObject(hdc, hOldFont)
        ENDIF

        currentY = currentY + lineH
    NEXT count

    DeleteObject(hFontHeader)
    DeleteObject(hFontBody)

    ' 4. GDI+ Top & Bottom Ambient Shadow Vignette (re-using pGfx)
    IF pGfx <> NULL THEN
        colSolidDark = 0xFF0D1117
        colTransDark = 0x000D1117

        ' A. Top Shadow Vignette
        pt1.x = 0 : pt1.y = VIEWPORT_Y
        pt2.x = 0 : pt2.y = VIEWPORT_Y + 50
        GdipCreateLineBrushI(&pt1, &pt2, colSolidDark, colTransDark, 0, &pTopBrush)
        IF pTopBrush <> NULL THEN
            GdipFillRectangleI(pGfx, pTopBrush, 0, VIEWPORT_Y, VIEWPORT_WIDTH, 50)
            GdipDeleteBrush(pTopBrush)
        ENDIF

        ' B. Bottom Shadow Vignette
        pt1.x = 0 : pt1.y = (VIEWPORT_Y + VIEWPORT_HEIGHT - 50)
        pt2.x = 0 : pt2.y = (VIEWPORT_Y + VIEWPORT_HEIGHT)
        GdipCreateLineBrushI(&pt1, &pt2, colTransDark, colSolidDark, 0, &pBtmBrush)
        IF pBtmBrush <> NULL THEN
            GdipFillRectangleI(pGfx, pBtmBrush, 0, (VIEWPORT_Y + VIEWPORT_HEIGHT - 50), VIEWPORT_WIDTH, 50)
            GdipDeleteBrush(pBtmBrush)
        ENDIF

        GdipDeleteGraphics(pGfx)
    ENDIF

    ' Restore DC Clipping Region
    RestoreDC(hdc, -1)
ENDSUB

' ===============================================================================
' RENDER HELP PANEL SUBROUTINE (Viewport Page 2 - Fixed Stack Safety)
' ===============================================================================

SUB RenderHelpPanel(hdc AS INT)
    wRECT rcDraw
    INT currentY = 80 - g_app.scrollY
    INT startY = 80
    INT currentX = 20, lineMaxHeight = 16
    INT pLen = 0, i = 1, tagEnd = 0
   
    ' Local string variables kept under 64 bytes to preserve stack space
    STRING tag[64], ch[2]
   
    UINT hFontNormal, hFontBold, hFontHeader, hCurrentFont
    SIZESTRUCT szText
    UINT hBulletBrush
    INT totalContentHeight = 0

    ' GDI+ Pointer for Book Icon Rendering
    POINTER pGfx = NULL
    INT iconX = 0, iconY = 0

    ' Lock GDI drawing inside Help Viewport bounds
    SaveDC(hdc)
    IntersectClipRect(hdc, 0, VIEWPORT_Y, VIEWPORT_WIDTH, VIEWPORT_Y + VIEWPORT_HEIGHT)

    ' Build Help Payload using global structure heap buffer
    g_app.htmlBuf = "<h1>Documentation</h1><br>"
    g_app.htmlBuf = g_app.htmlBuf + "<b>1. Overview:</b><br>"
    g_app.htmlBuf = g_app.htmlBuf + "<p>A native file-hardening tool written in <b>IWBasic 2.5</b> featuring a dual-buffered GDI/GDI+ skinned canvas, real-time logging, and native configuration persistence.<br></p>"
    g_app.htmlBuf = g_app.htmlBuf + "<p><b>2. Technical Specifications:</b><br>"
    g_app.htmlBuf = g_app.htmlBuf + "<ul>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Algorithm:</b> Rijndael-256 (True 256-bit block / 256-bit key) with AES-NI hardware acceleration</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Chaining Mode:</b> Cipher Feedback (CFB) stream chaining</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Key Stretching:</b> 1000-Iteration PBKDF2-style key derivation using static salt</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Compression Engine:</b> Raw <b><i>zlib.dll</i></b> integration (exact 1 MB chunk progress tracking)</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Stream Identifier:</b> Dual-offset header detection (0 & 16) with <b><i>RGUARD256</i></b> signature marking</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Shredder:</b> High-speed 1 MB Win32 block streaming sanitization with file truncation</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Memory Security:</b> Explicit zero-fill sanitation via <b><i>WipeBuffer</i></b></li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>System Guard:</b> Heuristic protection blocking Windows, Program Files, and System paths</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Settings Persistence:</b> Session state and window positioning via native INI parser</li>"
    g_app.htmlBuf = g_app.htmlBuf + "</ul><br></p>"
    g_app.htmlBuf = g_app.htmlBuf + "<p><b>3. Interface & Usage Instructions:</b><br>"
    g_app.htmlBuf = g_app.htmlBuf + "<ul>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Select Target:</b> Drag & drop files onto canvas, click <b>BROWSE</b>, or press <b>Ctrl+B</b></li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>ZIP Option:</b> Tick <b><i>ZIP first</i></b> to compress stream payloads via ZLIB prior to encryption</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Execute Protect:</b> Click <b>PROTECT FILE</b> or press <b>Ctrl+P</b></li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Execute Restore:</b> Click <b>RESTORE FILE</b> or press <b>Ctrl+R</b></li>"
    g_app.htmlBuf = g_app.htmlBuf + "</ul><br></p>"
    g_app.htmlBuf = g_app.htmlBuf + "<p><b>4. Keyboard Accelerators:</b><br>"
    g_app.htmlBuf = g_app.htmlBuf + "<ul>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>ESC:</b> Instantly slide back to Main Control Panel</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Ctrl+A:</b> Switch Viewport to About Screen</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Ctrl+H:</b> Switch Viewport to Help Screen</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Ctrl+M:</b> Send Mail to Author. Subject : R256</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>PageUp / PageDown:</b> Fast vertical viewport scrolling</li>"
    g_app.htmlBuf = g_app.htmlBuf + "<li><b>Up / Down Arrows:</b> Fine incremental line scrolling</li>"
    g_app.htmlBuf = g_app.htmlBuf + "</ul><br></p>"
    g_app.htmlBuf = g_app.htmlBuf + "<p><b>CRITICAL WARNING:</b><br>"
    g_app.htmlBuf = g_app.htmlBuf + "File shredding is <b>PERMANENT</b>. If you protect a file and lose the passphrase, recovery is mathematically impossible.<br></p>"

    hFontNormal = CreateFontA(-11, 0, 0, 0, 400, 0, 0, 0, 0, 0, 0, 5, 0, "Verdana")
    hFontBold   = CreateFontA(-12, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")
    hFontHeader = CreateFontA(-16, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")

    hCurrentFont = hFontNormal
    SelectObject(hdc, hCurrentFont)
    SetBkMode(hdc, 1)
    SetTextColor(hdc, RGB_TEXT_WHITE)

    pLen = LEN(g_app.htmlBuf)
    i = 1

    WHILE i <= pLen
        ch = MID$(g_app.htmlBuf, i, 1)

        IF ch = "<" THEN
            tagEnd = INSTR(g_app.htmlBuf, ">", i)
            IF tagEnd > 0 THEN
                tag = UCASE$(MID$(g_app.htmlBuf, i + 1, tagEnd - i - 1))
               
                IF tag = "BR" THEN
                    currentY = currentY + lineMaxHeight
                    currentX = 20
                ELSEIF tag = "P" THEN
                    currentY = currentY + lineMaxHeight + 4
                    currentX = 20
                ELSEIF tag = "H1" THEN
                    currentX = 20
                    hCurrentFont = hFontHeader
                    SelectObject(hdc, hCurrentFont)
                    SetTextColor(hdc, RGB_CYAN_ACCENT)
                    lineMaxHeight = 20

                    ' --- DRAW 32x32 BOOK ICON (OPPOSITE TO "DOCUMENTATION" TITLE) ---
                    IF g_app.pGpBookIcon <> NULL THEN
                        iconX = VIEWPORT_WIDTH - 32 - 20 ' 20px padding from right edge
                        iconY = currentY - 4             ' Align vertically with H1 line
                       
                        ' Only issue GDI+ draw if within viewport bounds
                        IF (iconY + 32) > VIEWPORT_Y AND iconY < (VIEWPORT_Y + VIEWPORT_HEIGHT) THEN
                            GdipCreateFromHDC(hdc, &pGfx)
                            IF pGfx <> NULL THEN
                                GdipDrawImageRectI(pGfx, g_app.pGpBookIcon, iconX, iconY, 32, 32)
                                GdipDeleteGraphics(pGfx)
                            ENDIF
                        ENDIF
                    ENDIF

                ELSEIF tag = "/H1" THEN
                    currentY = currentY + lineMaxHeight + 4
                    currentX = 20
                    hCurrentFont = hFontNormal
                    SelectObject(hdc, hCurrentFont)
                    SetTextColor(hdc, RGB_TEXT_WHITE)
                    lineMaxHeight = 15
                ELSEIF tag = "B" THEN
                    hCurrentFont = hFontBold
                    SelectObject(hdc, hCurrentFont)
                ELSEIF tag = "/B" THEN
                    hCurrentFont = hFontNormal
                    SelectObject(hdc, hCurrentFont)
                ELSEIF tag = "I" THEN
                    SetTextColor(hdc, RGB_GOLD_ACCENT)
                ELSEIF tag = "/I" THEN
                    SetTextColor(hdc, RGB_TEXT_WHITE)
                ELSEIF tag = "LI" THEN
                    currentY = currentY + lineMaxHeight + 2
                    currentX = 35
                    rcDraw.left = 24 : rcDraw.top = currentY + 4 : rcDraw.right = 29 : rcDraw.bottom = currentY + 9
                    hBulletBrush = CreateSolidBrush(RGB_CYAN_ACCENT)
                    FillRect(hdc, &rcDraw, hBulletBrush)
                    DeleteObject(hBulletBrush)
                ENDIF

                i = tagEnd + 1
            ELSE
                i++
            ENDIF
        ELSE
            g_app.tokenBuf = ""
            WHILE (i <= pLen)
                ch = MID$(g_app.htmlBuf, i, 1)
                IF ch = " " OR ch = "<" THEN BREAK
                g_app.tokenBuf = g_app.tokenBuf + ch
                i++
            WEND

            IF i <= pLen THEN
                IF MID$(g_app.htmlBuf, i, 1) = " " THEN
                    g_app.tokenBuf = g_app.tokenBuf + " "
                    i++
                ENDIF
            ENDIF

            IF LEN(g_app.tokenBuf) > 0 THEN
                GetTextExtentPoint32A(hdc, g_app.tokenBuf, LEN(g_app.tokenBuf), &szText)

                IF (currentX + szText.cx) > 400 THEN
                    currentY = currentY + lineMaxHeight
                    currentX = 20
                ENDIF

                rcDraw.left = currentX : rcDraw.top = currentY : rcDraw.right = currentX + szText.cx : rcDraw.bottom = currentY + szText.cy
                DrawTextA(hdc, g_app.tokenBuf, -1, &rcDraw, 0x00000800)
                currentX = currentX + szText.cx
            ENDIF
        ENDIF
    WEND

    DeleteObject(hFontNormal)
    DeleteObject(hFontBold)
    DeleteObject(hFontHeader)

    ' Calculate Total Extent & Set maxScrollY Dynamically
    totalContentHeight = (currentY + lineMaxHeight + g_app.scrollY) - startY
    IF totalContentHeight > VIEWPORT_HEIGHT THEN
        g_app.maxScrollY = totalContentHeight - VIEWPORT_HEIGHT + 20
    ELSE
        g_app.maxScrollY = 0
    ENDIF

    IF g_app.scrollY > g_app.maxScrollY THEN g_app.scrollY = g_app.maxScrollY

    RestoreDC(hdc, -1)
ENDSUB

SUB RenderCustomScrollbar(memDC AS UINT, gfx AS POINTER)
    INT trackX = 420, trackY = VIEWPORT_Y + 4
    INT trackW = 10, trackH = VIEWPORT_HEIGHT - 8
    INT thumbH, thumbY, maxThumbY
    POINTER pBrush = NULL, pPen = NULL, pPath = NULL
    wRECT rcTrack
    FLOAT r = 4.0

    ' Early return if no scrolling is required
    IF g_app.maxScrollY <= 0 THEN RETURN

    ' 1. Calculate Scroll Thumb Bounds based on Dynamic MaxScrollY
    IF g_app.scrollY < 0 THEN g_app.scrollY = 0
    IF g_app.scrollY > g_app.maxScrollY THEN g_app.scrollY = g_app.maxScrollY

    thumbH = INT((FLOAT(VIEWPORT_HEIGHT) / FLOAT(VIEWPORT_HEIGHT + g_app.maxScrollY)) * FLOAT(trackH))
    IF thumbH < 35 THEN thumbH = 35 ' Minimum thumb grab size

    maxThumbY = trackH - thumbH
    thumbY = trackY + INT((FLOAT(g_app.scrollY) / FLOAT(g_app.maxScrollY)) * FLOAT(maxThumbY))

    ' Save Thumb Bounding Rect for Mouse Hit-Testing
    g_app.rcThumb.left = trackX - 2
    g_app.rcThumb.right = trackX + trackW + 2
    g_app.rcThumb.top = thumbY
    g_app.rcThumb.bottom = thumbY + thumbH

    ' 2. Draw Track
    rcTrack.left = trackX : rcTrack.top = trackY : rcTrack.right = trackX + trackW : rcTrack.bottom = trackY + trackH
    UINT hBrushTrack = CreateSolidBrush(0x120C08)
    FillRect(memDC, &rcTrack, hBrushTrack)
    DeleteObject(hBrushTrack)

    ' 3. Draw Rounded Thumb using GDI+
    IF gfx <> NULL THEN
        UINT thumbClr = ARGB_CYAN_GLOW
        IF g_app.isDraggingThumb THEN thumbClr = ARGB_GOLD_BTN

        GdipCreatePath(0, &pPath)
        IF pPath <> NULL THEN
            FLOAT fx = FLOAT(trackX), fy = FLOAT(thumbY), fw = FLOAT(trackW), fh = FLOAT(thumbH)
            FLOAT d = r * 2.0
           
            GdipAddPathArc(pPath, fx, fy, d, d, 180.0, 90.0)
            GdipAddPathArc(pPath, fx + fw - d, fy, d, d, 270.0, 90.0)
            GdipAddPathArc(pPath, fx + fw - d, fy + fh - d, d, d, 0.0, 90.0)
            GdipAddPathArc(pPath, fx, fy + fh - d, d, d, 90.0, 90.0)
            GdipClosePathFigure(pPath)

            GdipCreateSolidFill(thumbClr, &pBrush)
            IF pBrush <> NULL THEN
                GdipFillPath(gfx, pBrush, pPath)
                GdipDeleteBrush(pBrush)
            ENDIF
           
            GdipDeletePath(pPath)
        ENDIF
    ENDIF
ENDSUB

' ===============================================================================
' NATIVE GDI / GDI+ HYBRID RENDER ENGINE (With Stage Translation)
' ===============================================================================

SUB RenderGDIPlusUI(hdc AS INT)
    UINT memDC, hBmp, hOldBmp, hBrush, hPen, hOldPen
    UINT hFontTitle, hFontSub, hFontLabel, hFontBar, hFontLink, hOldFont
    wRECT rcBox, rectFull, rectEmpty
    POINTER pMainGfx = NULL, pBrushGlow = NULL, pPenGlow = NULL, pScanPen = NULL, pShadowPath = NULL
   
    STRING strTitle = "Rijndael Guard"
    STRING strSub   = "256-Bit CFB Pipeline Engine"
    STRING strLbl1  = "Target File Path:"
    STRING strLbl2  = "Cipher Key / Password:"
    STRING strBtn1  = "&BROWSE..."
    STRING strBtn2  = "&PROTECT FILE"
    STRING strBtn3  = "&RESTORE FILE"
    STRING strFooter = "Help | Mail Author | About this program"
    STRING sHelp = "Help", sMail = "Mail Author", sAbout = "About this program", sPipe = " | "
    SIZESTRUCT szFull, szH, szM, szP, szH1, szM1, szA1
    INT footerX, footerY = 345, underlineY
    UINT btn1Bg, btn2Bg, btn3Bg, edit1Border, edit2Border
    INT barWidth = 395, barHeight = 26, barX = 20, barY = 287
    INT xdiv, textX, textY, scanY
    INT offX = g_app.stageX
    GpPointF ptStart, ptEnd
    CHAR szExe[260]
    UINT hIcon

    memDC = CreateCompatibleDC(hdc)
    hBmp = CreateCompatibleBitmap(hdc, 440, 395)
    hOldBmp = SelectObject(memDC, hBmp)
    GdipCreateFromHDC(memDC, &pMainGfx)
    IF pMainGfx <> NULL THEN
        GdipSetTextRenderingHint(pMainGfx, 5)   
        GdipSetSmoothingMode(pMainGfx, 2)       
    ENDIF

    rcBox.left = 0 : rcBox.top = 0 : rcBox.right = 440 : rcBox.bottom = 395
    hBrush = CreateSolidBrush(RGB_BG_DARK)
    FillRect(memDC, &rcBox, hBrush)
    DeleteObject(hBrush)

    ' Header Section (Fixed Top Banner)
    IF pMainGfx <> NULL THEN
        ptStart.X = 0.0 : ptStart.Y = 0.0 : ptEnd.X = 0.0 : ptEnd.Y = 65.0
        GdipCreateLineBrush(&ptStart, &ptEnd, ARGB_FOOTER_TOP, ARGB_FOOTER_BOT, WrapModeTile, &pBrushGlow)
        IF pBrushGlow <> NULL THEN
            GdipFillRectangleI(pMainGfx, pBrushGlow, 0, 0, 440, 65)
            GdipDeleteBrush(pBrushGlow)
        ENDIF

        GdipCreatePen1(ARGB_SCANLINE, 1.0, 2, &pScanPen)
        IF pScanPen <> NULL THEN
            FOR scanY = 2 TO 63 STEP 2
                GdipDrawLineI(pMainGfx, pScanPen, 0, scanY, 440, scanY)
            NEXT scanY
            GdipDeletePen(pScanPen)
        ENDIF
    ENDIF

    hPen = CreatePen(0, 1, RGB_PANEL_BORDER)
    hOldPen = SelectObject(memDC, hPen)
    MoveToEx(memDC, 0, 65, NULL) : LineToWin32(memDC, 440, 65)
    SelectObject(memDC, hOldPen) : DeleteObject(hPen)

    GetModuleFileNameA(0, szExe, 260)
    hIcon = ExtractIconA(GetModuleHandleA(NULL), szExe, 0)
    IF hIcon <> 0 THEN
        DrawIconEx(memDC, 20, 16, hIcon, 32, 32, 0, 0, 3)
        DestroyIcon(hIcon)
    ENDIF

    hFontTitle = CreateFontA(-16, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Verdana")
    hFontSub   = CreateFontA(-11, 0, 0, 0, 400, 0, 0, 0, 0, 0, 0, 5, 0, "Verdana")
    hFontLabel = CreateFontA(-12, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")
    hFontBar   = CreateFontA(-12, 0, 0, 0, 700, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")
    hFontLink  = CreateFontA(-11, 0, 0, 0, 400, 0, 0, 0, 0, 0, 0, 5, 0, "Verdana")

    SetBkMode(memDC, 1)
    SetTextColor(memDC, RGB_CYAN_ACCENT)
    hOldFont = SelectObject(memDC, hFontTitle)
    rcBox.left = 62 : rcBox.top = 14 : rcBox.right = 420 : rcBox.bottom = 34
    DrawTextA(memDC, strTitle, -1, &rcBox, 0x00000020)
    SetTextColor(memDC, RGB_TEXT_MUTED) : SelectObject(memDC, hFontSub)
    rcBox.top = 36 : rcBox.bottom = 54 : DrawTextA(memDC, strSub, -1, &rcBox, 0x00000020)

    ' Save DC State before viewport horizontal stage translation
    SaveDC(memDC)

    ' Render Viewport Stage Panels
    ' ---------------------------------------------------------------------------
    ' Render Panel 0 (About Panel - Left)
    SetViewportOrgEx(memDC, offX - VIEWPORT_WIDTH, 0, NULL)
    RenderAboutPanel(memDC)

    ' Render Panel 2 (GDI Help Panel - Right)
    SetViewportOrgEx(memDC, offX + VIEWPORT_WIDTH, 0, NULL)
    RenderHelpPanel(memDC)
    RenderCustomScrollbar(memDC, pMainGfx) ' <-- Pass memDC and pMainGfx directly

    ' Render Panel 1 (Main Control Viewport - Center)
    SetViewportOrgEx(memDC, offX, 0, NULL)

    IF pMainGfx <> NULL THEN
        GdipCreatePath(0, &pShadowPath)
        IF pShadowPath <> NULL THEN
            GdipAddPathArc(pShadowPath, 14.0, 72.0, 16.0, 16.0, 180.0, 90.0)
            GdipAddPathArc(pShadowPath, 422.0 - 16.0, 72.0, 16.0, 16.0, 270.0, 90.0)
            GdipAddPathArc(pShadowPath, 422.0 - 16.0, 335.0 - 16.0, 16.0, 16.0, 0.0, 90.0)
            GdipAddPathArc(pShadowPath, 14.0, 335.0 - 16.0, 16.0, 16.0, 90.0, 90.0)
            GdipClosePathFigure(pShadowPath)

            GdipCreateSolidFill(ARGB_SHADOW_COLOR, &pBrushGlow)
            IF pBrushGlow <> NULL THEN
                GdipFillPath(pMainGfx, pBrushGlow, pShadowPath)
                GdipDeleteBrush(pBrushGlow)
            ENDIF
            GdipDeletePath(pShadowPath)
        ENDIF
    ENDIF

    SetTextColor(memDC, RGB_TEXT_WHITE) : SelectObject(memDC, hFontLabel)
    rcBox.left = 20 : rcBox.top = 80 : rcBox.right = 220 : rcBox.bottom = 98
    DrawTextA(memDC, strLbl1, -1, &rcBox, 0x00000020)
   
    rcBox.top = 165 : rcBox.bottom = 183 : DrawTextA(memDC, strLbl2, -1, &rcBox, 0x00000020)

    IF pMainGfx <> NULL THEN
        edit1Border = 0xFF3B291E : edit2Border = 0xFF3B291E
        IF g_app.focusedEdit = 1 THEN edit1Border = ARGB_CYAN_GLOW
        IF g_app.focusedEdit = 2 THEN edit2Border = ARGB_CYAN_GLOW
        GdipCreateSolidFill(ARGB_EDIT_BG, &pBrushGlow)
        GdipFillRectangleI(pMainGfx, pBrushGlow, 18, 98, 399, 23)
        GdipFillRectangleI(pMainGfx, pBrushGlow, 18, 183, 399, 23)
        GdipDeleteBrush(pBrushGlow)
        GdipCreatePen1(edit1Border, 1.2, 2, &pPenGlow)
        GdipDrawRectangleI(pMainGfx, pPenGlow, 18, 98, 399, 23)
        GdipDeletePen(pPenGlow)
        GdipCreatePen1(edit2Border, 1.2, 2, &pPenGlow)
        GdipDrawRectangleI(pMainGfx, pPenGlow, 18, 183, 399, 23)
        GdipDeletePen(pPenGlow)
    ENDIF

    btn1Bg = ARGB_HEADER_BG : IF g_app.hoverBtn = 1 THEN btn1Bg = 0xFF2A364F
    DrawGdiPlusButton(pMainGfx, 20.0, 247.0, 110.0, 27.0, 5.0, btn1Bg, ARGB_CYAN_GLOW, RGB_CYAN_ACCENT, strBtn1, hFontLabel, memDC)

    IF g_app.isProtectedMarker THEN
        DrawGdiPlusButton(pMainGfx, 140.0, 247.0, 130.0, 27.0, 5.0, ARGB_BTN_DISABLED, 0xFF505050, RGB_TEXT_MUTED, strBtn2, hFontLabel, memDC)
    ELSE
        btn2Bg = 0xFF064E3B : IF g_app.hoverBtn = 2 THEN btn2Bg = ARGB_GREEN_BTN
        DrawGdiPlusButton(pMainGfx, 140.0, 247.0, 130.0, 27.0, 5.0, btn2Bg, ARGB_GREEN_BTN, RGB_TEXT_WHITE, strBtn2, hFontLabel, memDC)
    ENDIF

    IF g_app.isProtectedMarker = 0 THEN
        DrawGdiPlusButton(pMainGfx, 280.0, 247.0, 135.0, 27.0, 5.0, ARGB_BTN_DISABLED, 0xFF505050, RGB_TEXT_MUTED, strBtn3, hFontLabel, memDC)
    ELSE
        btn3Bg = 0xFF916A10 : IF g_app.hoverBtn = 3 THEN btn3Bg = ARGB_GOLD_BTN
        DrawGdiPlusButton(pMainGfx, 280.0, 247.0, 135.0, 27.0, 5.0, btn3Bg, ARGB_GOLD_BTN, RGB_TEXT_WHITE, strBtn3, hFontLabel, memDC)
    ENDIF

    xdiv = INT((g_app.progressPos * barWidth) / 100)
    rectFull.left = barX : rectFull.top = barY : rectFull.right = barX + xdiv : rectFull.bottom = barY + barHeight
    rectEmpty.left = barX + xdiv : rectEmpty.top = barY : rectEmpty.right = barX + barWidth : rectEmpty.bottom = barY + barHeight
    textX = barX + INT(barWidth / 2) : textY = barY + 5
    SelectObject(memDC, hFontBar) : SetTextAlign(memDC, TA_CENTER)

    IF g_app.alertFlash THEN
        rectFull.left = barX : rectFull.top = barY : rectFull.right = barX + barWidth : rectFull.bottom = barY + barHeight
        SetTextColor(memDC, RGB_TEXT_WHITE)
        SetBkColor(memDC, RGB_ALERT_RED)
        ExtTextOutA(memDC, textX, textY, ETO_CLIPPED | ETO_OPAQUE, &rectFull, g_app.statusMsg, LEN(g_app.statusMsg), 0)
        IF pMainGfx <> NULL THEN : GdipCreatePen1(0xFFDC2626, 1.2, 2, &pPenGlow) : GdipDrawRectangleI(pMainGfx, pPenGlow, barX, barY, barWidth, barHeight) : GdipDeletePen(pPenGlow) : ENDIF
    ELSE
        IF pMainGfx <> NULL AND xdiv > 0 THEN
            ptStart.X = FLOAT(barX) : ptStart.Y = 0.0
            ptEnd.X = FLOAT(barX + barWidth) : ptEnd.Y = 0.0
            GdipCreateLineBrush(&ptStart, &ptEnd, ARGB_HEADER_BG, ARGB_CYAN_GLOW, WrapModeTile, &pBrushGlow)
            IF pBrushGlow <> NULL THEN
                GdipFillRectangleI(pMainGfx, pBrushGlow, barX, barY, xdiv, barHeight)
                GdipDeleteBrush(pBrushGlow)
            ENDIF
        ENDIF

        IF xdiv < barWidth THEN
            SetTextColor(memDC, RGB(184, 163, 148))
            SetBkColor(memDC, RGB(21, 28, 44))
            ExtTextOutA(memDC, textX, textY, ETO_CLIPPED | ETO_OPAQUE, &rectEmpty, g_app.statusMsg, LEN(g_app.statusMsg), 0)
        ENDIF

        IF xdiv > 0 THEN
            SetTextColor(memDC, RGB_TEXT_WHITE)
            SetBkMode(memDC, 1)
            ExtTextOutA(memDC, textX, textY, ETO_CLIPPED, &rectFull, g_app.statusMsg, LEN(g_app.statusMsg), 0)
        ENDIF

        IF pMainGfx <> NULL THEN
            GdipCreatePen1(ARGB_CYAN_GLOW, 1.0, 2, &pPenGlow)
            GdipDrawRectangleI(pMainGfx, pPenGlow, barX, barY, barWidth, barHeight)
            GdipDeletePen(pPenGlow)
        ENDIF
    ENDIF

    ' Restore original DC viewport origin for fixed Footer
    RestoreDC(memDC, -1)

    ' ===========================================================================
    ' FOOTER SECTION (Fixed Bottom Bar)
    ' ===========================================================================
    IF pMainGfx <> NULL THEN
        ptStart.Y = 343.0 : ptEnd.Y = 365.0
        GdipCreateLineBrush(&ptStart, &ptEnd, ARGB_FOOTER_TOP, ARGB_FOOTER_BOT, WrapModeTile, &pBrushGlow)
        IF pBrushGlow <> NULL THEN : GdipFillRectangleI(pMainGfx, pBrushGlow, 0, 343, 440, 22) : GdipDeleteBrush(pBrushGlow) : ENDIF

        GdipCreatePen1(ARGB_SCANLINE, 1.0, 2, &pScanPen)
        IF pScanPen <> NULL THEN
            FOR scanY = 345 TO 363 STEP 2
                GdipDrawLineI(pMainGfx, pScanPen, 0, scanY, 440, scanY)
            NEXT scanY
            GdipDeletePen(pScanPen)
        ENDIF
    ENDIF

    hPen = CreatePen(0, 1, RGB_PANEL_BORDER) : hOldPen = SelectObject(memDC, hPen)
    MoveToEx(memDC, 0, 343, NULL) : LineToWin32(memDC, 440, 343)
    SelectObject(memDC, hOldPen) : DeleteObject(hPen)

    ' ---------------------------------------------------------------------------
    ' Bottom-Left ESC Indicator (Rendered in Goldenrod when not on Main Panel)
    ' ---------------------------------------------------------------------------
    IF g_app.activePage <> PAGE_MAIN THEN
        SelectObject(memDC, hFontLink)
        SetBkMode(memDC, 1)
        SetTextColor(memDC, RGB_GOLD_ACCENT) ' Goldenrod Accent
        rcBox.left = 15 : rcBox.top = footerY : rcBox.right = 200 : rcBox.bottom = footerY + 20
        DrawTextA(memDC, "Press <ESC> to go back", -1, &rcBox, 0)
    ENDIF

    ' ---------------------------------------------------------------------------
    ' Bottom-Right Footer Viewport Switcher Links
    ' ---------------------------------------------------------------------------
    SelectObject(memDC, hFontLink) : SetTextAlign(memDC, 0)
    GetTextExtentPoint32A(memDC, strFooter, LEN(strFooter), &szFull)
    GetTextExtentPoint32A(memDC, sHelp, LEN(sHelp), &szH)
    GetTextExtentPoint32A(memDC, sPipe, LEN(sPipe), &szP)
    GetTextExtentPoint32A(memDC, sMail, LEN(sMail), &szM)
   
    footerX = 425 - szFull.cx
    g_app.rcLinkHelp.left = footerX : g_app.rcLinkHelp.right = footerX + szH.cx : g_app.rcLinkHelp.top = footerY : g_app.rcLinkHelp.bottom = footerY+20
    g_app.rcLinkMail.left = g_app.rcLinkHelp.right + szP.cx : g_app.rcLinkMail.right = g_app.rcLinkMail.left + szM.cx
    g_app.rcLinkMail.top = footerY : g_app.rcLinkMail.bottom = footerY+20
    g_app.rcLinkAbout.left = g_app.rcLinkMail.right + szP.cx : g_app.rcLinkAbout.right = 425
    g_app.rcLinkAbout.top = footerY : g_app.rcLinkAbout.bottom = footerY+20

    SetTextColor(memDC, RGB_TEXT_MUTED)
    rcBox.left = footerX : rcBox.top = footerY : rcBox.right = 440 : rcBox.bottom = footerY+20
    DrawTextA(memDC, strFooter, -1, &rcBox, 0)

    GetTextExtentPoint32A(memDC, "H", 1, &szH1)
    GetTextExtentPoint32A(memDC, "M", 1, &szM1)
    GetTextExtentPoint32A(memDC, "A", 1, &szA1)
    underlineY = footerY + 14

    hPen = CreatePen(0, 1, RGB_TEXT_MUTED)
    hOldPen = SelectObject(memDC, hPen)
   
    MoveToEx(memDC, g_app.rcLinkHelp.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkHelp.left + szH1.cx, underlineY)
    MoveToEx(memDC, g_app.rcLinkMail.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkMail.left + szM1.cx, underlineY)
    MoveToEx(memDC, g_app.rcLinkAbout.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkAbout.left + szA1.cx, underlineY)
   
    SelectObject(memDC, hOldPen) : DeleteObject(hPen)

    IF g_app.hoverLink > 0 THEN
        SetTextColor(memDC, RGB_CYAN_ACCENT)
        hPen = CreatePen(0, 1, RGB_CYAN_ACCENT)
        hOldPen = SelectObject(memDC, hPen)
       
        IF g_app.hoverLink = 1 THEN
            rcBox.left = g_app.rcLinkHelp.left : rcBox.right = g_app.rcLinkHelp.right : DrawTextA(memDC, sHelp, -1, &rcBox, 0)
            MoveToEx(memDC, g_app.rcLinkHelp.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkHelp.left + szH1.cx, underlineY)
        ELSEIF g_app.hoverLink = 2 THEN
            rcBox.left = g_app.rcLinkMail.left : rcBox.right = g_app.rcLinkMail.right : DrawTextA(memDC, sMail, -1, &rcBox, 0)
            MoveToEx(memDC, g_app.rcLinkMail.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkMail.left + szM1.cx, underlineY)
        ELSEIF g_app.hoverLink = 3 THEN
            rcBox.left = g_app.rcLinkAbout.left : rcBox.right = g_app.rcLinkAbout.right : DrawTextA(memDC, sAbout, -1, &rcBox, 0)
            MoveToEx(memDC, g_app.rcLinkAbout.left, underlineY, NULL) : LineToWin32(memDC, g_app.rcLinkAbout.left + szA1.cx, underlineY)
        ENDIF
       
        SelectObject(memDC, hOldPen) : DeleteObject(hPen)
    ENDIF

    IF pMainGfx <> NULL THEN GdipDeleteGraphics(pMainGfx)
    SelectObject(memDC, hOldFont) : DeleteObject(hFontTitle) : DeleteObject(hFontSub) : DeleteObject(hFontLabel) : DeleteObject(hFontBar) : DeleteObject(hFontLink)
    BitBlt(hdc, 0, 0, 440, 395, memDC, 0, 0, 0x00CC0020)
    SelectObject(memDC, hOldBmp) : DeleteObject(hBmp) : DeleteDC(memDC)
ENDSUB

' ===============================================================================
' VIEWPORT SLIDING ANIMATION ENGINE
' ===============================================================================
SUB SlideViewportToPage(INT targetPage)
    INT startX = 0, targetX = 0, i = 0
    UINT hFileEdit, hPassEdit, hZipChk, hShowChk

    IF g_app.activePage = targetPage OR g_app.isAnimating THEN RETURN
    g_app.isAnimating = 1

    hFileEdit = GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT)
    hPassEdit = GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT)
    hZipChk   = GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK)
    hShowChk  = GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK)

    ' Calculate target stage X offset
    IF targetPage = PAGE_HELP THEN
        targetX = -VIEWPORT_WIDTH
    ELSEIF targetPage = PAGE_ABOUT THEN
        targetX = VIEWPORT_WIDTH
    ELSE
        targetX = 0
    ENDIF

    startX = g_app.stageX

    ' Smooth 10-frame sliding loop (~100ms)
    FOR i = 1 TO 10
        g_app.stageX = startX + INT(((targetX - startX) * i) / 10)
       
        ' Synchronize positions of child Edit & Checkbox controls on Panel 1
        IF hFileEdit <> 0 THEN SetWindowPos(hFileEdit, 0, 20 + g_app.stageX, 100, 395, 19, SWP_NOZORDER)
        IF hZipChk <> 0   THEN SetWindowPos(hZipChk,   0, 22 + g_app.stageX, 123, 200, 18, SWP_NOZORDER)
        IF hPassEdit <> 0 THEN SetWindowPos(hPassEdit, 0, 20 + g_app.stageX, 185, 395, 19, SWP_NOZORDER)
        IF hShowChk <> 0  THEN SetWindowPos(hShowChk,  0, 22 + g_app.stageX, 213, 130, 18, SWP_NOZORDER)

        InvalidateRect(g_app.win.hwnd, NULL, 0)
        UpdateWindow(g_app.win.hwnd)
        Sleep(8)
    NEXT i

    ' Hide/Show child controls via Win32 API (SW_SHOW = 5, SW_HIDE = 0)
    IF targetPage = PAGE_MAIN THEN
        IF hFileEdit <> 0 THEN Win32ShowWindow(hFileEdit, 5)
        IF hPassEdit <> 0 THEN Win32ShowWindow(hPassEdit, 5)
        IF hZipChk <> 0   THEN Win32ShowWindow(hZipChk, 5)
        IF hShowChk <> 0  THEN Win32ShowWindow(hShowChk, 5)
    ELSE
        IF hFileEdit <> 0 THEN Win32ShowWindow(hFileEdit, 0)
        IF hPassEdit <> 0 THEN Win32ShowWindow(hPassEdit, 0)
        IF hZipChk <> 0   THEN Win32ShowWindow(hZipChk, 0)
        IF hShowChk <> 0  THEN Win32ShowWindow(hShowChk, 0)
    ENDIF

    g_app.activePage = targetPage
    g_app.isAnimating = 0

    ' Reset and trigger Scroller when sliding to About Page
    IF targetPage = PAGE_ABOUT THEN
        g_app.aboutScrollY = 0 ' Reset starting scroll offset
        SetTimer(g_app.win.hwnd, 101, 30, NULL) ' Smooth 30ms scroll tick
    ELSE
        KillTimer(g_app.win.hwnd, 101)
    ENDIF

    InvalidateRect(g_app.win.hwnd, NULL, 1)
ENDSUB

' ===============================================================================
' MULTI-THREADED WORKER PIPELINE (With Header Marker & Disk Pre-Check)
' ===============================================================================
' MAIN THREADED FILE STREAM PROCESSOR
' Handles file streams in 1 MB chunks with hardware CFB acceleration and fallback.
' ===============================================================================
SUB ProcessFileThreaded(password AS STRING, encryptMode AS INT)
    STRING fPath, tmpPath, fileNameOnly, targetWorkPath
    STRING gzStagePath = ""
    INT i, pwdLen, pathLen, nameLen, flashIdx
    DOUBLE totalFileSize = 0.0, bytesProcessed = 0.0
    INT bytesRead = 0, bytesWritten = 0
    INT hFileIn = 0, hFileOut = 0
    INT blockOffset = 0, currentBlock = 0
    INT alignBytes = 0
   
    ' Local Pointers for ASM engine (initialized to NULL first)
    POINTER pBuf = NULL
    POINTER pCFB = NULL
    POINTER pKey = NULL

    ' 1. Increased buffer size to 1 MB for high-throughput streaming I/O
    INT chunkSize = 1048576
    INT lastReportPos = -1
   
    INT bIn, bOut
    POINTER pCFBByte, pChunkByte
   
    POINTER pChunkBuf = NULL
    DEF nextCFB[32] AS CHAR
    DEF markerHeader[16] AS CHAR

    ' RGUARD256 Header Signature Definition (16 bytes)
    markerHeader[0] = 0x52 : markerHeader[1] = 0x47 : markerHeader[2] = 0x55 : markerHeader[3] = 0x41
    markerHeader[4] = 0x52 : markerHeader[5] = 0x44 : markerHeader[6] = 0x32 : markerHeader[7] = 0x35
    markerHeader[8] = 0x36 : markerHeader[9] = 0xFF : markerHeader[10]= 0xFE : markerHeader[11]= 0x00
    markerHeader[12]= 0x00 : markerHeader[13]= 0x00 : markerHeader[14]= 0x00 : markerHeader[15]= 0x00

    fPath = GETCONTROLTEXT(g_app.win, ID_FILE_EDIT)
    pathLen = LEN(fPath)
    pwdLen = LEN(password)

    ' 2. File Existence & System Path Guard Checks
    IF GetFileAttributesA(fPath) = INVALID_FILE_ATTRIBUTES THEN
        g_app.statusMsg = "ERROR: Target file does not exist on disk!"
        LogAction("ProcessFile Error: File not found on disk: " + fPath)
        FOR flashIdx = 1 TO 3
            g_app.alertFlash = 1
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(350)
            g_app.alertFlash = 0
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(200)
        NEXT flashIdx
        GOTO CleanupAndUnlock
    ENDIF

    IF IsSystemPath(fPath) THEN
        g_app.statusMsg = "ACCESS DENIED: Protected System Directory File!"
        LogAction("ACCESS DENIED: Attempted operation on protected system path: " + fPath)
        FOR flashIdx = 1 TO 3
            g_app.alertFlash = 1
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(350)
            g_app.alertFlash = 0
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(200)
        NEXT flashIdx
        GOTO CleanupAndUnlock
    ENDIF

    targetWorkPath = fPath

    ' 3. Optional ZLIB Pre-compression Stage (100% Exact Progress Stream)
    IF encryptMode AND g_app.hasZlibDll AND GETSTATE(g_app.win, ID_ZIPFIRST_CHK) THEN
        g_app.statusMsg = "Compressing stream via ZLIB: 0%"
        LogAction("ZIP First enabled: Pre-compressing " + fPath + " via ZLIB.")
        InvalidateRect(g_app.win.hwnd, NULL, 0)
       
        gzStagePath = fPath + ".gzstage"
       
        ' Fetch source file size for progress calculations
        HANDLE hTempCheck = CreateFileA(fPath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
        DOUBLE gzSrcSize = GetFileSize64(hTempCheck)
        CloseHandle(hTempCheck)

        IF CompressFileGzChunked(fPath, gzStagePath, gzSrcSize) = 1 THEN
            targetWorkPath = gzStagePath
            LogAction("ZLIB Pre-compression succeeded: " + gzStagePath)
        ELSE
            g_app.statusMsg = "Error: ZLIB Compression failed!"
            LogAction("Error: ZLIB Compression failed on " + fPath)
            DELETEFILE gzStagePath
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            GOTO CleanupAndUnlock
        ENDIF
    ENDIF

    tmpPath = fPath + ".tmp"
    DELETEFILE tmpPath

    fileNameOnly = GetFileNameOnly(fPath)
    nameLen = LEN(fileNameOnly)

    IF encryptMode THEN
        LogAction("Starting Protect Operation on: " + targetWorkPath)
    ELSE
        LogAction("Starting Restore Operation on: " + targetWorkPath)
    ENDIF

    ' 4. Key Expansion & Initial CFB Vector Construction
    StretchKey(password, g_app.pKeyArray)
    KeySched()

    FOR i = 0 TO BLOCKBYTES - 1
        pCFBByte = g_app.pCFBBuf + i
        IF i < nameLen THEN
            INT ch = ASC(MID$(fileNameOnly, i + 1, 1))
            IF ch >= 97 AND ch <= 122 THEN ch = ch - 32
            #<CHAR>pCFBByte = ch
        ELSE
            #<CHAR>pCFBByte = 0
        ENDIF
    NEXT i

    hFileIn = CreateFileA(targetWorkPath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFileIn = INVALID_HANDLE_VALUE THEN
        g_app.statusMsg = "Error: Failed to open source file (Locked or Access Denied)."
        LogAction("Error: CreateFileA failed to open source file: " + targetWorkPath)
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        WipeBuffer(g_app.pKeyArray, 2048)
        WipeBuffer(g_app.pCFBBuf, 128)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
        GOTO CleanupAndUnlock
    ENDIF

    totalFileSize = GetFileSize64(hFileIn)

    IF HasSufficientDiskSpace(targetWorkPath, totalFileSize) = 0 THEN
        CloseHandle(hFileIn)
        g_app.statusMsg = "ERROR: Insufficient free disk space for processing!"
        LogAction("Error: Aborted operation due to insufficient free disk space.")
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        WipeBuffer(g_app.pKeyArray, 2048)
        WipeBuffer(g_app.pCFBBuf, 128)
        FOR flashIdx = 1 TO 3
            g_app.alertFlash = 1
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(350)
            g_app.alertFlash = 0
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(200)
        NEXT flashIdx
        GOTO CleanupAndUnlock
    ENDIF

    IF (encryptMode = 0) AND (g_app.isProtectedMarker = 1) THEN
        DEF dummyHead[16] AS CHAR
        ReadFile(hFileIn, &dummyHead, 16, &bytesRead, 0)
        totalFileSize = totalFileSize - 16.0
    ENDIF

    IF totalFileSize <= 0.0 THEN
        CloseHandle(hFileIn)
        g_app.statusMsg = "Notice: Target file is empty or unreadable."
        LogAction("Notice: Target file is empty or unreadable: " + targetWorkPath)
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        WipeBuffer(g_app.pKeyArray, 2048)
        WipeBuffer(g_app.pCFBBuf, 128)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
        GOTO CleanupAndUnlock
    ENDIF

    ' 5. Buffer Allocation (1 MB)
    IF ALLOCMEM(pChunkBuf, 1, chunkSize) <> 0 THEN
        CloseHandle(hFileIn)
        g_app.statusMsg = "Error: Out of memory allocating 1MB buffer!"
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        WipeBuffer(g_app.pKeyArray, 2048)
        WipeBuffer(g_app.pCFBBuf, 128)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
        GOTO CleanupAndUnlock
    ENDIF

    hFileOut = CreateFileA(tmpPath, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0)
    IF hFileOut = INVALID_HANDLE_VALUE THEN
        CloseHandle(hFileIn)
        FREEMEM pChunkBuf
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        g_app.statusMsg = "Error: Failed to create temporary output file."
        LogAction("Error: CreateFileA failed for temp file: " + tmpPath)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
        GOTO CleanupAndUnlock
    ENDIF

    IF encryptMode THEN
        WriteFile(hFileOut, &markerHeader, 16, &bytesWritten, 0)
    ENDIF

    ' 6. High-Speed Streaming Loop
    bytesProcessed = 0.0
    DO
        bytesRead = 0
        IF ReadFile(hFileIn, pChunkBuf, chunkSize, &bytesRead, 0) <> 0 AND bytesRead > 0 THEN
           
            ' Fast Path: Inlined Assembly Hardware CFB Pipeline
            IF g_app.hasAESNI THEN
                ' Pack parameters into global memory slots before _asm
                g_aesArgs[0] = pChunkBuf
                g_aesArgs[1] = (bytesRead + 15) & ~15
                g_aesArgs[2] = g_app.pCFBBuf
                g_aesArgs[3] = g_app.pKeyArray
                g_aesArgs[4] = encryptMode

                _asm
                    push eax
                    push ebx
                    push ecx
                    push edx
                    push esi

                    ; Fetch parameters from global memory array
                    mov eax, dword [g_aesArgs]        ; Buffer pointer
                    mov ecx, dword [g_aesArgs + 4]    ; alignBytes
                    mov ebx, dword [g_aesArgs + 8]    ; pCFB
                    mov edx, dword [g_aesArgs + 12]   ; pKey
                    mov esi, dword [g_aesArgs + 16]   ; encryptMode

                ._cfb_block_loop:
                    cmp ecx, 0
                    jle ._cfb_done

                    movdqu xmm0, [ebx]

                    movdqu xmm1, [edx]
                    pxor xmm0, xmm1

                    movdqu xmm1, [edx + 16]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 32]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 48]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 64]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 80]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 96]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 112]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 128]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 144]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 160]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 176]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 192]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1
                    movdqu xmm1, [edx + 208]
                    db 0x66, 0x0F, 0x38, 0xDC, 0xC1

                    movdqu xmm1, [edx + 224]
                    db 0x66, 0x0F, 0x38, 0xDD, 0xC1

                    movdqu xmm2, [eax]

                    cmp esi, 0
                    je ._cfb_decrypt_mode

                ._cfb_encrypt_mode:
                    pxor xmm0, xmm2
                    movdqu [eax], xmm0
                    movdqu [ebx], xmm0
                    jmp ._cfb_next_step

                ._cfb_decrypt_mode:
                    movdqu xmm3, xmm2
                    pxor xmm0, xmm2
                    movdqu [eax], xmm0
                    movdqu [ebx], xmm3

                ._cfb_next_step:
                    add eax, 16
                    sub ecx, 16
                    jmp ._cfb_block_loop

                ._cfb_done:
                    pop esi
                    pop edx
                    pop ecx
                    pop ebx
                    pop eax
                _endasm

            ELSE
                ' Software Fallback Loop (Original nested BASIC loop)
                INT chunkBlocks = INT((bytesRead + BLOCKBYTES - 1) / BLOCKBYTES)
               
                FOR currentBlock = 0 TO chunkBlocks - 1
                    blockOffset = currentBlock * BLOCKBYTES
                    CipherEngine()

                    FOR i = 0 TO BLOCKBYTES - 1
                        INT byteIdx = blockOffset + i
                        IF byteIdx < bytesRead THEN
                            pChunkByte = pChunkBuf + byteIdx
                            pCFBByte = g_app.pCFBBuf + i
                           
                            bIn = #<CHAR>pChunkByte & 0xFF
                            bOut = (bIn || (#<CHAR>pCFBByte & 0xFF)) & 0xFF
                           
                            #<CHAR>pChunkByte = bOut

                            IF encryptMode THEN
                                nextCFB[i] = bOut
                            ELSE
                                nextCFB[i] = bIn
                            ENDIF
                        ELSE
                            nextCFB[i] = 0
                        ENDIF
                    NEXT i

                    FOR i = 0 TO BLOCKBYTES - 1
                        pCFBByte = g_app.pCFBBuf + i
                        #<CHAR>pCFBByte = nextCFB[i]
                    NEXT i
                NEXT currentBlock
            ENDIF

            WriteFile(hFileOut, pChunkBuf, bytesRead, &bytesWritten, 0)

            bytesProcessed = bytesProcessed + bytesRead
            g_app.progressPos = INT((bytesProcessed * 100.0) / totalFileSize)
           
            ' Throttled UI Updates: Redraw window ONLY when progress percentage changes
            IF g_app.progressPos <> lastReportPos THEN
                lastReportPos = g_app.progressPos
                IF encryptMode THEN
                    g_app.statusMsg = "Protecting Stream: " + STR$(g_app.progressPos) + "%"
                ELSE
                    g_app.statusMsg = "Restoring Stream: " + STR$(g_app.progressPos) + "%"
                ENDIF
               
                InvalidateRect(g_app.win.hwnd, NULL, 0)
            ENDIF
        ENDIF
    UNTIL bytesRead <= 0

    CloseHandle(hFileIn)
    SetEndOfFile(hFileOut)
    CloseHandle(hFileOut)
    FREEMEM pChunkBuf

    ' 7. Post-Processing: ZLIB Decompression Check
    IF (encryptMode = 0) AND (totalFileSize >= 2.0) THEN
        hFileIn = CreateFileA(tmpPath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
        IF hFileIn <> INVALID_HANDLE_VALUE THEN
           
            ' If the decrypted file starts with our 16-byte marker header, skip it first
            DEF checkHeader[18] AS CHAR
            ReadFile(hFileIn, &checkHeader, 18, &bytesRead, 0)
            CloseHandle(hFileIn)

            INT isGzip = 0
           
            ' Case A: Direct GZIP header at offset 0 (0x1F, 0x8B)
            IF (checkHeader[0] & 0xFF) = 0x1F AND (checkHeader[1] & 0xFF) = 0x8B THEN
                isGzip = 1
            ' Case B: GZIP header sitting right after 16-byte marker header (offset 16)
            ELSEIF (checkHeader[16] & 0xFF) = 0x1F AND (checkHeader[17] & 0xFF) = 0x8B THEN
                isGzip = 1
            ENDIF

            IF isGzip THEN
                g_app.statusMsg = "Decompressing ZLIB stream..."
                LogAction("GZIP header detected on restored stream. Expanding via ZLIB...")
                InvalidateRect(g_app.win.hwnd, NULL, 0)
               
                STRING decompPath = fPath + ".decomp"
                IF ExpandFileGzWin32(tmpPath, decompPath) = 1 THEN
                    DELETEFILE tmpPath
                    COPYFILE decompPath, tmpPath, 0
                    DELETEFILE decompPath
                    LogAction("ZLIB Post-decompression succeeded.")
                ELSE
                    LogAction("Warning: ZLIB Decompression check failed or skipped.")
                ENDIF
            ENDIF
        ENDIF
    ENDIF

    ' 8. Secure Shred & Replace Operations
    FastShredFileWin32(fPath, totalFileSize)

    IF COPYFILE(tmpPath, fPath, 0) <> 0 THEN
        DELETEFILE tmpPath
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        g_app.progressPos = 100
        IF encryptMode THEN
            g_app.statusMsg = "SUCCESS: Protected (100%)."
            LogAction("SUCCESS: Protected file successfully: " + fPath)
        ELSE
            g_app.statusMsg = "SUCCESS: Restored (100%)."
            LogAction("SUCCESS: Restored file successfully: " + fPath)
        ENDIF
        CheckFileStatusAndMarker(fPath)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
    ELSE
        IF LEN(gzStagePath) > 0 THEN DELETEFILE gzStagePath
        g_app.statusMsg = "Warning: Saved output to " + tmpPath
        LogAction("Warning: COPYFILE failed to replace original file. Temporary output saved at: " + tmpPath)
        InvalidateRect(g_app.win.hwnd, NULL, 0)
    ENDIF

    WipeBuffer(g_app.pKeyArray, 2048)
    WipeBuffer(g_app.pCFBBuf, 128)
    WipeBuffer(&nextCFB, 32)

LABEL CleanupAndUnlock
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT), 1)
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT), 1)
    IF g_app.hasZlibDll THEN EnableWindow(GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK), 1)
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK), 1)
    g_app.isProcessing = 0
ENDSUB

SUB BackgroundThreadWorker(POINTER pParam), INT
    ProcessFileThreaded(g_ThreadData.password, g_ThreadData.encryptMode)
    RETURN 0
ENDSUB

SUB StartWorkerThread(STRING password, INT encryptMode)
    IF g_app.isProcessing THEN RETURN

    STRING fPath = GETCONTROLTEXT(g_app.win, ID_FILE_EDIT)
    INT flashIdx = 0

    IF (LEN(fPath) = 0) OR (GetFileAttributesA(fPath) = INVALID_FILE_ATTRIBUTES) THEN
        g_app.statusMsg = "ERROR: Target file does not exist on disk!"
        LogAction("StartWorkerThread Error: File missing on disk: " + fPath)
        FOR flashIdx = 1 TO 3
            g_app.alertFlash = 1
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(350)
            g_app.alertFlash = 0
            InvalidateRect(g_app.win.hwnd, NULL, 0)
            UpdateWindow(g_app.win.hwnd)
            Sleep(200)
        NEXT flashIdx
        RETURN
    ENDIF

    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT), 0)
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT), 0)
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK), 0)
    EnableWindow(GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK), 0)

    g_app.isProcessing = 1
    g_ThreadData.password = password
    g_ThreadData.encryptMode = encryptMode

    INT threadId = 0
    CreateThread(NULL, 0, &BackgroundThreadWorker, NULL, 0, &threadId)
ENDSUB

' ===============================================================================
' EXACT PROGRESS ZLIB GZIP COMPRESSOR
' Reads source file in 1 MB chunks, compresses via zlib.dll, and provides
' exact uncompressed byte progress updates to the UI.
' ===============================================================================
' ===============================================================================
' EXACT PROGRESS ZLIB GZIP COMPRESSOR (STRICT IWBASIC SYNTAX)
' ===============================================================================
SUB CompressFileGzChunked(srcPath AS STRING, destPath AS STRING, totalFileSize AS DOUBLE), INT
    INT hSrc = 0, hDest = 0
    INT bytesRead = 0, bytesWritten = 0, ret = 0
    DOUBLE bytesProcessed = 0.0
    INT lastReportPos = -1
   
    POINTER pInBuf = NULL
    POINTER pOutBuf = NULL
   
    INT bufSize = 1048576  ' 1 MB RAM Buffers
    z_stream strm
   
    ' Null-terminated C-string version buffer in RAM
    DEF zVer[8] AS CHAR
    zVer[0] = ASC("1") : zVer[1] = ASC(".") : zVer[2] = ASC("2") : zVer[3] = ASC(".")
    zVer[4] = ASC("1") : zVer[5] = ASC("1") : zVer[6] = 0

    hSrc = CreateFileA(srcPath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
    IF hSrc = INVALID_HANDLE_VALUE THEN RETURN 0
   
    hDest = CreateFileA(destPath, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0)
    IF hDest = INVALID_HANDLE_VALUE THEN
        CloseHandle(hSrc)
        RETURN 0
    ENDIF

    IF ALLOCMEM(pInBuf, 1, bufSize) <> 0 OR ALLOCMEM(pOutBuf, 1, bufSize) <> 0 THEN
        CloseHandle(hSrc)
        CloseHandle(hDest)
        IF pInBuf THEN FREEMEM pInBuf
        IF pOutBuf THEN FREEMEM pOutBuf
        RETURN 0
    ENDIF

    ' Zero-fill strm structure memory to prevent bad pointer calls
    WipeBuffer(&strm, LEN(strm))

    ' Initialize zlib with GZIP header mode (MAX_WBITS + 16 = 31)
    ' Pass parameters strictly as defined in DECLARE
    ret = deflateInit2_(&strm, 6, Z_DEFLATED, 31, 8, 0, &zVer, LEN(strm))
    IF ret <> Z_OK THEN
        CloseHandle(hSrc)
        CloseHandle(hDest)
        FREEMEM pInBuf
        FREEMEM pOutBuf
        RETURN 0
    ENDIF

    DO
        bytesRead = 0
        IF ReadFile(hSrc, pInBuf, bufSize, &bytesRead, 0) <> 0 AND bytesRead > 0 THEN
            strm.next_in = pInBuf
            strm.avail_in = bytesRead
           
            INT flushFlag = Z_NO_FLUSH
            IF bytesRead < bufSize THEN flushFlag = Z_FINISH

            DO
                strm.next_out = pOutBuf
                strm.avail_out = bufSize
               
                ret = deflate(&strm, flushFlag)
                INT haveWrite = bufSize - strm.avail_out
               
                IF haveWrite > 0 THEN
                    WriteFile(hDest, pOutBuf, haveWrite, &bytesWritten, 0)
                ENDIF
            UNTIL strm.avail_out <> 0

            ' Update exact uncompressed byte progress
            bytesProcessed = bytesProcessed + bytesRead
            IF totalFileSize > 0.0 THEN
                g_app.progressPos = INT((bytesProcessed * 100.0) / totalFileSize)
               
                IF g_app.progressPos <> lastReportPos THEN
                    lastReportPos = g_app.progressPos
                    g_app.statusMsg = "Compressing Stream (ZLIB): " + STR$(g_app.progressPos) + "%"
                    InvalidateRect(g_app.win.hwnd, NULL, 0)
                ENDIF
            ENDIF
        ENDIF
    UNTIL bytesRead <= 0

    deflateEnd(&strm)
    CloseHandle(hSrc)
    CloseHandle(hDest)
    FREEMEM pInBuf
    FREEMEM pOutBuf

    RETURN 1
ENDSUB

SUB GetFileNameOnly(fullPath AS STRING), STRING
    INT i, pLen = LEN(fullPath)
   
    FOR i = pLen TO 1 STEP -1
        INT ch = ASC(MID$(fullPath, i, 1))
        IF ch = 92 OR ch = 47 THEN RETURN MID$(fullPath, i + 1)
    NEXT i
   
    RETURN fullPath
ENDSUB

SUB IsSystemPath(fPath AS STRING), INT
    STRING upperPath = UCASE$(fPath)
    STRING slash = CHR$(92)
    STRING targetWin = slash + "WINDOWS" + slash
    STRING targetProg = slash + "PROGRAM FILES" + slash
    STRING targetProg86 = slash + "PROGRAM FILES (X86)" + slash
    STRING targetSysVol = slash + "SYSTEM VOLUME INFORMATION" + slash
    STRING targetTemp = slash + "APPDATA" + slash + "LOCAL" + slash + "TEMP" + slash
    STRING driveWin = "C:" + slash + "WINDOWS"

    IF INSTR(upperPath, targetWin) > 0 OR LEFT$(upperPath, 10) = driveWin THEN RETURN 1
    IF INSTR(upperPath, targetProg) > 0 OR INSTR(upperPath, targetProg86) > 0 THEN RETURN 1
    IF INSTR(upperPath, targetSysVol) > 0 THEN RETURN 1
    IF INSTR(upperPath, targetTemp) > 0 THEN RETURN 1
   
    RETURN 0
ENDSUB

' ===============================================================================
' NATIVE SUBCLASS WNDPROC (Unified Navigation, Hotkeys & Mouse Control)
' ===============================================================================

SUB SubclassProc(hwnd AS UINT, uMsg AS UINT, wp AS UINT, lp AS UINT), INT
    PAINTSTRUCT ps
    UINT hdc, hDrop
    INT mouse_X, mouse_Y, lastHover, lastLink
    STRING selectedPath
    UINT passHwnd
    POINTER pBufTarget
    INT limitY

    SELECT uMsg
  ' 0x0010 = WM_CLOSE
        CASE 0x0010
            ' 1. Persist state and window position to R256.ini
            SaveSettings(GETCONTROLTEXT(g_app.win, ID_FILE_EDIT))           
            ' 2. Destroy/Close the main stage window
            CLOSEWINDOW g_app.win
            RETURN 0
        CASE WM_ERASEBKGND
            RETURN 1

        ' 1. Intercept Dialog Manager Navigation Keys (Prevents OS key eating)
        CASE 0x0087 ' WM_GETDLGCODE
            RETURN 0x0004 ' DLGC_WANTALLKEYS

        ' 2. Custom Dark Theme Edit & Control Brushes
        CASE WM_CTLCOLOREDIT
            SetTextColor(wp, RGB_TEXT_WHITE)
            SetBkColor(wp, RGB_EDIT_BG)
            SetBkMode(wp, 2)
            RETURN g_app.hEditBrush

        CASE WM_CTLCOLORSTATIC
            IF lp = GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK) OR lp = GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK) THEN
                SetTextColor(wp, RGB_TEXT_MUTED)
                SetBkColor(wp, RGB_BG_DARK)
                SetBkMode(wp, 1)
                RETURN g_app.hDarkBrush
            ENDIF

        CASE WM_CTLCOLORBTN
            IF lp = GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK) OR lp = GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK) THEN
                SetTextColor(wp, RGB_TEXT_MUTED)
                SetBkColor(wp, RGB_BG_DARK)
                SetBkMode(wp, 1)
                RETURN g_app.hDarkBrush
            ENDIF

        ' 3. Unified Keyboard Hotkeys & Viewport Navigation
        CASE WM_KEYDOWN
            ' ESC Key Handler: Always return to Main Control Panel
            IF wp = 0x1B THEN ' VK_ESCAPE
                IF g_app.activePage <> PAGE_MAIN THEN
                    SlideViewportToPage(PAGE_MAIN)
                    RETURN 0
                ENDIF
            ENDIF

            ' Control Accelerators (<Ctrl> + Key)
            IF (GetKeyState(0x11) & 0x8000) THEN ' VK_CONTROL
                SELECT wp
                    CASE 0x41 ' Ctrl+A -> Toggle / Slide to About Screen
                        IF g_app.activePage = PAGE_ABOUT THEN
                            SlideViewportToPage(PAGE_MAIN)
                        ELSE
                            SlideViewportToPage(PAGE_ABOUT)
                        ENDIF
                        RETURN 0

                    CASE 0x48 ' Ctrl+H -> Toggle / Slide to Help Screen
                        IF g_app.activePage = PAGE_HELP THEN
                            SlideViewportToPage(PAGE_MAIN)
                        ELSE
                            SlideViewportToPage(PAGE_HELP)
                        ENDIF
                        RETURN 0

                    CASE 0x4D ' Ctrl+M -> Direct Slide back to Main Control Panel
                        IF g_app.activePage <> PAGE_MAIN THEN
                            ShellExecuteA(hwnd, "open", "mailto:yannick.dalissier@outlook.com", NULL, NULL, 1)
                        ENDIF
                        RETURN 0

                    CASE 0x42 ' Ctrl+B -> File Browse Dialog
                        IF g_app.activePage = PAGE_MAIN AND g_app.isProcessing = 0 THEN
                            selectedPath = FILEREQUEST("Select Target File", g_app.win, 1, "All Files (*.*)|*.*||", "")
                            IF selectedPath <> "" THEN
                                IF LEN(selectedPath) <= 256 THEN
                                    SETCONTROLTEXT(g_app.win, ID_FILE_EDIT, selectedPath)
                                    CheckFileStatusAndMarker(selectedPath)
                                    LogAction("File selected via Browse hotkey: " + selectedPath)
                                ENDIF
                                InvalidateRect(hwnd, NULL, 0)
                            ENDIF
                            RETURN 0
                        ENDIF

                    CASE 0x50 ' Ctrl+P -> Protect Execution
                        IF g_app.activePage = PAGE_MAIN AND g_app.isProcessing = 0 AND g_app.isProtectedMarker = 0 THEN
                            StartWorkerThread(GETCONTROLTEXT(g_app.win, ID_PASS_EDIT), 1)
                            RETURN 0
                        ENDIF

                    CASE 0x52 ' Ctrl+R -> Restore Execution
                        IF g_app.activePage = PAGE_MAIN AND g_app.isProcessing = 0 AND g_app.isProtectedMarker = 1 THEN
                            StartWorkerThread(GETCONTROLTEXT(g_app.win, ID_PASS_EDIT), 0)
                            RETURN 0
                        ENDIF
                ENDSELECT
            ENDIF

            ' Help Viewport Keyboard Scrolling (PageUp, PageDown, Arrows, Home, End)
            IF g_app.activePage = PAGE_HELP THEN
                limitY = g_app.maxScrollY
                IF limitY <= 0 THEN limitY = 400 ' Fallback threshold prior to first paint pass

                SELECT wp
                    CASE 0x21 ' VK_PRIOR (PageUp)
                        g_app.scrollY = g_app.scrollY - (VIEWPORT_HEIGHT - 32)
                        IF g_app.scrollY < 0 THEN g_app.scrollY = 0
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0

                    CASE 0x22 ' VK_NEXT (PageDown)
                        g_app.scrollY = g_app.scrollY + (VIEWPORT_HEIGHT - 32)
                        IF g_app.scrollY > limitY THEN g_app.scrollY = limitY
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0

                    CASE 0x26 ' VK_UP (Up Arrow)
                        g_app.scrollY = g_app.scrollY - 20
                        IF g_app.scrollY < 0 THEN g_app.scrollY = 0
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0

                    CASE 0x28 ' VK_DOWN (Down Arrow)
                        g_app.scrollY = g_app.scrollY + 20
                        IF g_app.scrollY > limitY THEN g_app.scrollY = limitY
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0

                    CASE 0x24 ' VK_HOME
                        g_app.scrollY = 0
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0

                    CASE 0x23 ' VK_END
                        g_app.scrollY = limitY
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0
                ENDSELECT
            ENDIF

        ' 4. Mouse Wheel Scrolling Handler
        CASE 0x020A ' WM_MOUSEWHEEL
            IF g_app.activePage = PAGE_HELP THEN
                INT zDelta = (wp >> 16) & 0xFFFF
                IF zDelta > 32767 THEN zDelta = zDelta - 65536
                limitY = g_app.maxScrollY
                IF limitY <= 0 THEN limitY = 400

                IF zDelta > 0 THEN
                    g_app.scrollY = g_app.scrollY - 28
                ELSE
                    g_app.scrollY = g_app.scrollY + 28
                ENDIF

                IF g_app.scrollY < 0 THEN g_app.scrollY = 0
                IF g_app.scrollY > limitY THEN g_app.scrollY = limitY
                InvalidateRect(hwnd, NULL, 0)
                RETURN 0
            ENDIF

        ' 5. Consolidated LBUTTONDOWN Handler
        CASE WM_LBUTTONDOWN
            mouse_X = lp & 0xFFFF
            mouse_Y = (lp >> 16) & 0xFFFF

            ' Clear edit focus on background clicks
            SetFocus g_app.win

            ' A. Help Panel Custom Scrollbar Thumb Dragging
            IF g_app.activePage = PAGE_HELP THEN
                IF mouse_X >= g_app.rcThumb.left AND mouse_X <= g_app.rcThumb.right THEN
                    IF mouse_Y >= g_app.rcThumb.top AND mouse_Y <= g_app.rcThumb.bottom THEN
                        g_app.isDraggingThumb = 1
                        g_app.dragStartMouseY = mouse_Y
                        g_app.dragStartScroll = g_app.scrollY
                        SetCapture(hwnd)
                        InvalidateRect(hwnd, NULL, 0)
                        RETURN 0
                    ENDIF
                ENDIF
            ENDIF

            ' B. Main Stage Action Buttons
            IF mouse_Y >= 247 AND mouse_Y <= 274 AND g_app.isProcessing = 0 AND g_app.activePage = PAGE_MAIN THEN
                IF mouse_X >= 20 AND mouse_X <= 130 THEN
                    selectedPath = FILEREQUEST("Select Target File", g_app.win, 1, "All Files (*.*)|*.*||", "")
                    IF selectedPath <> "" THEN
                        IF LEN(selectedPath) <= 256 THEN
                            SETCONTROLTEXT(g_app.win, ID_FILE_EDIT, selectedPath)
                            CheckFileStatusAndMarker(selectedPath)
                            LogAction("File selected via Browse: " + selectedPath)
                        ELSE
                            g_app.statusMsg = "Error: File path exceeds 256 characters!"
                            LogAction("Error: Browse path exceeded 256 chars.")
                        ENDIF
                        InvalidateRect(hwnd, NULL, 0)
                    ENDIF
                ELSEIF mouse_X >= 140 AND mouse_X <= 270 THEN
                    IF g_app.isProtectedMarker = 0 THEN
                        StartWorkerThread(GETCONTROLTEXT(g_app.win, ID_PASS_EDIT), 1)
                    ENDIF
                ELSEIF mouse_X >= 280 AND mouse_X <= 415 THEN
                    IF g_app.isProtectedMarker = 1 THEN
                        StartWorkerThread(GETCONTROLTEXT(g_app.win, ID_PASS_EDIT), 0)
                    ENDIF
                ENDIF
            ENDIF

            ' C. Footer Viewport Switcher Navigation Links
            IF mouse_Y >= g_app.rcLinkHelp.top AND mouse_Y <= g_app.rcLinkHelp.bottom THEN
                IF mouse_X >= g_app.rcLinkHelp.left AND mouse_X <= g_app.rcLinkHelp.right THEN
                    IF g_app.activePage = PAGE_HELP THEN
                        SlideViewportToPage(PAGE_MAIN)
                    ELSE
                        SlideViewportToPage(PAGE_HELP)
                    ENDIF
                    RETURN 0
                ELSEIF mouse_X >= g_app.rcLinkMail.left AND mouse_X <= g_app.rcLinkMail.right THEN
                    ShellExecuteA(hwnd, "open", "mailto:yannick.dalissier@outlook.com", NULL, NULL, 1)
                    RETURN 0
                ELSEIF mouse_X >= g_app.rcLinkAbout.left AND mouse_X <= g_app.rcLinkAbout.right THEN
                    IF g_app.activePage = PAGE_ABOUT THEN
                        SlideViewportToPage(PAGE_MAIN)
                    ELSE
                        SlideViewportToPage(PAGE_ABOUT)
                    ENDIF
                    RETURN 0
                ENDIF
            ENDIF

        ' 6. Mouse Hover Tracking & Scrollbar Dragging Update
        CASE WM_MOUSEMOVE
            mouse_X = lp & 0xFFFF
            mouse_Y = (lp >> 16) & 0xFFFF

            IF g_app.isDraggingThumb THEN
                INT deltaY = mouse_Y - g_app.dragStartMouseY
                INT trackH = VIEWPORT_HEIGHT - 8
                FLOAT scrollFactor = FLOAT(g_app.maxScrollY) / FLOAT(trackH - 35)
       
                g_app.scrollY = g_app.dragStartScroll + INT(FLOAT(deltaY) * scrollFactor)
                IF g_app.scrollY < 0 THEN g_app.scrollY = 0
                IF g_app.scrollY > g_app.maxScrollY THEN g_app.scrollY = g_app.maxScrollY
       
                InvalidateRect(hwnd, NULL, 0)
                RETURN 0
            ENDIF

            lastHover = g_app.hoverBtn
            lastLink = g_app.hoverLink
            g_app.hoverBtn = 0
            g_app.hoverLink = 0

            IF mouse_Y >= 247 AND mouse_Y <= 274 AND g_app.isProcessing = 0 AND g_app.activePage = PAGE_MAIN THEN
                IF mouse_X >= 20 AND mouse_X <= 130 THEN g_app.hoverBtn = 1
                IF mouse_X >= 140 AND mouse_X <= 270 AND g_app.isProtectedMarker = 0 THEN g_app.hoverBtn = 2
                IF mouse_X >= 280 AND mouse_X <= 415 AND g_app.isProtectedMarker = 1 THEN g_app.hoverBtn = 3
            ENDIF

            IF mouse_Y >= g_app.rcLinkHelp.top AND mouse_Y <= g_app.rcLinkHelp.bottom THEN
                IF mouse_X >= g_app.rcLinkHelp.left AND mouse_X <= g_app.rcLinkHelp.right THEN g_app.hoverLink = 1
                IF mouse_X >= g_app.rcLinkMail.left AND mouse_X <= g_app.rcLinkMail.right THEN g_app.hoverLink = 2
                IF mouse_X >= g_app.rcLinkAbout.left AND mouse_X <= g_app.rcLinkAbout.right THEN g_app.hoverLink = 3
            ENDIF

            IF g_app.hoverBtn <> lastHover OR g_app.hoverLink <> lastLink THEN InvalidateRect(hwnd, NULL, 0)

        ' 7. Scrollbar Release
        CASE WM_LBUTTONUP
            IF g_app.isDraggingThumb THEN
                g_app.isDraggingThumb = 0
                ReleaseCapture()
                InvalidateRect(hwnd, NULL, 0)
                RETURN 0
            ENDIF

        ' 8. Checkbox & Dynamic Text Event Commands
        CASE WM_COMMAND
            IF (wp & 0xFFFF) = ID_SHOWPASS_CHK THEN
                passHwnd = GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT)
                IF GETSTATE(g_app.win, ID_SHOWPASS_CHK) THEN
                    SendMessageA(passHwnd, EM_SETPASSWORDCHAR, 0, 0)
                ELSE
                    SendMessageA(passHwnd, EM_SETPASSWORDCHAR, 42, 0)
                ENDIF
                InvalidateRect(passHwnd, NULL, 1)
            ELSEIF (wp & 0xFFFF) = ID_FILE_EDIT THEN
                IF ((wp >> 16) & 0xFFFF) = 0x0300 THEN ' EN_CHANGE
                    CheckFileStatusAndMarker(GETCONTROLTEXT(g_app.win, ID_FILE_EDIT))
                ENDIF
            ENDIF

        ' 9. Double-Buffered Paint Pass
        CASE WM_PAINT
            hdc = BeginPaint(hwnd, &ps)
            RenderGDIPlusUI(hdc)
            EndPaint(hwnd, &ps)
            RETURN 0

' 10. 0x0113 = WM_TIMER
        CASE 0x0113
            IF wp = 101 THEN
                IF g_app.activePage = PAGE_ABOUT THEN
                    g_app.aboutScrollY = g_app.aboutScrollY + 1
                   
                    ' Reset back to 0 as soon as the last line completely disappears past the top
                    IF g_app.aboutScrollY > 600 THEN
                        g_app.aboutScrollY = 0
                    ENDIF
                   
                    InvalidateRect(hwnd, NULL, 0)
                ELSE
                    KillTimer(hwnd, 101)
                ENDIF
                RETURN 0
            ENDIF

        ' 11. Native Win32 Drag & Drop Support
        CASE WM_DROPFILES
            hDrop = wp
            IF g_app.isProcessing = 0 AND g_app.activePage = PAGE_MAIN AND DragQueryFileA(hDrop, 0, g_app.pDropBuf, 512) > 0 THEN
                pBufTarget = g_app.pDropBuf
                selectedPath = #<STRING>pBufTarget
                IF LEN(selectedPath) <= 256 THEN
                    SETCONTROLTEXT(g_app.win, ID_FILE_EDIT, selectedPath)
                    CheckFileStatusAndMarker(selectedPath)
                    LogAction("File loaded via Drag & Drop: " + selectedPath)
                ELSE
                    g_app.statusMsg = "Error: Dropped path exceeds 256 characters!"
                    LogAction("Error: Dropped path exceeded 256 chars.")
                ENDIF
                InvalidateRect(hwnd, NULL, 0)
            ENDIF
            DragFinish(hDrop)
            RETURN 0
    ENDSELECT

    RETURN CallWindowProcA(g_app.pOldWndProc, hwnd, uMsg, wp, lp)
ENDSUB

' ===============================================================================
' IWBASIC WINDOW HANDLER
' ===============================================================================

SUB Handler(), INT
    SELECT @MESSAGE
        CASE @IDCLOSEWINDOW
            ' Prevent abrupt exit mid-cipher operation
            IF g_app.isProcessing THEN RETURN 0

            ' Save window coordinates and last folder before memory wipe
            SaveSettings(GETCONTROLTEXT(g_app.win, ID_FILE_EDIT))

            IF g_app.pKeyArray <> NULL THEN WipeBuffer(g_app.pKeyArray, 2048) : FREEMEM g_app.pKeyArray
            IF g_app.pCFBBuf <> NULL THEN WipeBuffer(g_app.pCFBBuf, 128) : FREEMEM g_app.pCFBBuf
            IF g_app.pDropBuf <> NULL THEN WipeBuffer(g_app.pDropBuf, 1024) : FREEMEM g_app.pDropBuf
            IF g_app.pPwrTab <> NULL THEN WipeBuffer(g_app.pPwrTab, 256) : FREEMEM g_app.pPwrTab
            IF g_app.pLogTab <> NULL THEN WipeBuffer(g_app.pLogTab, 256) : FREEMEM g_app.pLogTab
            IF g_app.pSBox <> NULL THEN WipeBuffer(g_app.pSBox, 256) : FREEMEM g_app.pSBox
            CLOSEWINDOW g_app.win
    ENDSELECT
    RETURN 0
ENDSUB

' ===============================================================================
' MAIN ENTRY POINT
' ===============================================================================
$MAIN

INT initStatus
UINT hFileEdit, hPassEdit, hZipChk, hShowChk
INT hZlibCheck = 0

g_app.activePage = PAGE_MAIN
g_app.isAnimating = 0
g_app.stageX = 0

g_app.logBufSize = 65536
g_app.logBufUsed = 0
g_app.gdiToken = 0
g_app.gdiRefCount = 0
g_app.isProcessing = 0
g_app.hasZlibDll = 0
g_app.isProtectedMarker = 0
g_app.statusMsg = "System Ready. Drop a target file to begin."

g_app.iniPath = GETSTARTPATH + "R256.ini"
g_app.logPath = GETSTARTPATH + "log.txt"

ALLOCMEM(g_app.pLogBuffer, g_app.logBufSize, 1)

LogAction("--- Application Started ---")

hZlibCheck = LoadLibraryA(GETSTARTPATH + "zlib.dll")
IF hZlibCheck = 0 THEN
    hZlibCheck = LoadLibraryA(GETSTARTPATH + "zlib1.dll")
ENDIF

IF hZlibCheck <> 0 THEN
    g_app.hasZlibDll = 1
    FreeLibrary(hZlibCheck)
    LogAction("Startup Verification: zlib.dll detected.")
ELSE
    g_app.hasZlibDll = 0
    g_app.statusMsg = "Notice: zlib.dll not found. Pre-compression disabled."
    LogAction("Startup Notice: zlib.dll not found in GETSTARTPATH. ZIP option disabled.")
ENDIF

initStatus = InitAES_Engine()
IF initStatus = 0 THEN
    LogAction("Initialization Error: Failed to allocate crypto memory.")
    MESSAGEBOX(0, "Initialization Error: Failed to allocate crypto memory.", "AES Engine")
    END
ENDIF

IF TestCipherInversion() = 0 THEN
    LogAction("CRITICAL ERROR: Core Cipher Engine failed in-memory roundtrip test!")
    MESSAGEBOX(0, "CRITICAL ERROR: Core Cipher Engine failed in-memory roundtrip test!", "Crypto Math Failure")
    END
ENDIF

IF InitGDIPlus() = 0 THEN
    LogAction("Initialization Error: Failed to start GDI+ subsystem.")
    MESSAGEBOX(0, "Initialization Error: Failed to start GDI+ subsystem.", "GDI+ Engine")
    END
ENDIF

g_app.hEditBrush = CreateSolidBrush(RGB_EDIT_BG)
g_app.hDarkBrush = CreateSolidBrush(RGB_BG_DARK)
g_app.hEditFont   = CreateFontA(-12, 0, 0, 0, 400, 0, 0, 0, 0, 0, 0, 5, 0, "Tahoma")

g_credits[0]  = "=|= Version 2.56 - Final =|="
g_credits[1]  = "Portable Compact Security Tool"
g_credits[2]  = ""
g_credits[3]  = "=|= DEVELOPMENT =|="
g_credits[4]  = "Written in IWBasic 2.5"
g_credits[5]  = "Programming: Yannick Dalissier"
g_credits[6]  = "Assistance: Gemini AI"
g_credits[7]  = ""
g_credits[8]  = "=|= LIBRARIES & CRYPTO CORE =|="
g_credits[9]  = "Compression: zlib / zlib1 stream DLL"
g_credits[10] = "Cipher Engine: 256-Bit CFB Rijndael"
g_credits[11] = ""
g_credits[12] = "=|= SOFTWARE LICENSE =|="
g_credits[13] = "This is Free Software!"
g_credits[14] = "You are granted the right to copy"
g_credits[15] = "and distribute this program freely."
g_credits[16] = ""
g_credits[17] = "Press <ESC> to return to Main Screen"
g_creditsCount = 18

' 1. Open Main Window
    OPENWINDOW g_app.win, 0, 0, 440, 395, @CAPTION|@SYSMENU|@MINBOX|@NOAUTODRAW, 0, "Rijndael Guard", &Handler

    ' 3. Log startup once
    LogAction("--- Application Started ---")
   
    ' 4. Check zlib DLL
    IF LoadLibraryA("zlib1.dll") <> 0 OR LoadLibraryA("zlib.dll") <> 0 THEN
        LogAction("Startup Verification: zlib.dll detected.")
    ENDIF

    ' 5. Check Hardware Acceleration
    g_app.hasAESNI = IsAESNI_Supported()
SELECT g_app.hasAESNI
CASE 1
        SETCAPTION g_app.win, "R256 [Hardware Mode]"
DEFAULT
        SETCAPTION g_app.win, "R256 [Software Mode]"
    ENDSELECT

DragAcceptFiles(g_app.win.hwnd, 1)

g_app.pOldWndProc = SetWindowLongA(g_app.win.hwnd, GWL_WNDPROC, &SubclassProc)

CONTROL g_app.win, @EDIT, "", 20, 100, 395, 19, @TABSTOP, ID_FILE_EDIT
CONTROL g_app.win, @CHECKBOX, "ZIP first before encrypting", 22, 123, 200, 18, @TABSTOP, ID_ZIPFIRST_CHK
CONTROL g_app.win, @EDIT, "", 20, 185, 395, 19, @TABSTOP | @CTEDITPASS | @CTEDITCENTER, ID_PASS_EDIT
CONTROL g_app.win, @CHECKBOX, "Show password", 22, 213, 130, 18, @TABSTOP, ID_SHOWPASS_CHK

hFileEdit = GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT)
hPassEdit = GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT)
hZipChk   = GETCONTROLHANDLE(g_app.win, ID_ZIPFIRST_CHK)
hShowChk  = GETCONTROLHANDLE(g_app.win, ID_SHOWPASS_CHK)

IF hFileEdit <> 0 THEN
    SendMessageA(hFileEdit, WM_SETFONT, g_app.hEditFont, 1)
    SendMessageA(hFileEdit, EM_LIMITTEXT, 256, 0)
ENDIF

IF hPassEdit <> 0 THEN
    SendMessageA(hPassEdit, WM_SETFONT, g_app.hEditFont, 1)
    SendMessageA(hPassEdit, EM_LIMITTEXT, 256, 0)
ENDIF

IF hZipChk <> 0 THEN
    SendMessageA(hZipChk, WM_SETFONT, g_app.hEditFont, 1)
    IF g_app.hasZlibDll = 0 THEN
        EnableWindow(hZipChk, 0)
    ENDIF
ENDIF

IF hShowChk <> 0 THEN
    SendMessageA(hShowChk, WM_SETFONT, g_app.hEditFont, 1)
ENDIF

StripEditBorders(ID_FILE_EDIT)
StripEditBorders(ID_PASS_EDIT)

g_app.pOldFileEditProc = SetWindowLongA(hFileEdit, GWL_WNDPROC, &EditSubclassProc)
g_app.pOldPassEditProc = SetWindowLongA(hPassEdit, GWL_WNDPROC, &EditSubclassProc)

SETCONTROLCOLOR g_app.win, ID_FILE_EDIT, RGB_TEXT_WHITE, RGB_EDIT_BG
SETCONTROLCOLOR g_app.win, ID_ZIPFIRST_CHK, RGB_TEXT_MUTED, RGB_BG_DARK
SETCONTROLCOLOR g_app.win, ID_PASS_EDIT, RGB_TEXT_WHITE, RGB_EDIT_BG
SETCONTROLCOLOR g_app.win, ID_SHOWPASS_CHK, RGB_TEXT_MUTED, RGB_BG_DARK

' 6. Load INI settings (Position & File Path) ONCE
LoadSettings()

' 7. Load Pictures from DATA blocks
LoadAboutLogoData()
LoadBookIconData()

WAITUNTIL g_app.win = 0

IF g_app.pOldWndProc <> 0 THEN SetWindowLongA(g_app.win.hwnd, GWL_WNDPROC, g_app.pOldWndProc)
IF g_app.pOldFileEditProc <> 0 THEN SetWindowLongA(GETCONTROLHANDLE(g_app.win, ID_FILE_EDIT), GWL_WNDPROC, g_app.pOldFileEditProc)
IF g_app.pOldPassEditProc <> 0 THEN SetWindowLongA(GETCONTROLHANDLE(g_app.win, ID_PASS_EDIT), GWL_WNDPROC, g_app.pOldPassEditProc)

IF g_app.hEditBrush <> 0 THEN DeleteObject(g_app.hEditBrush)
IF g_app.hDarkBrush <> 0 THEN DeleteObject(g_app.hDarkBrush)
IF g_app.hEditFont  <> 0 THEN DeleteObject(g_app.hEditFont)
IF g_app.pLogBuffer <> NULL THEN FREEMEM g_app.pLogBuffer
IF g_app.pGpAboutLogo <> NULL THEN
    GdipDisposeImage(g_app.pGpAboutLogo)
    g_app.pGpAboutLogo = NULL
ENDIF

IF g_app.pGpBookIcon <> NULL THEN
    GdipDisposeImage(g_app.pGpBookIcon)
    g_app.pGpBookIcon = NULL
ENDIF

ShutdownGDIPlus()

LogAction("--- Application Closed ---")
SaveLogBufferToDisk()

END

' ===============================================================================
' ONE-TIME GDI+ LOADER FOR 32x32 HELP BOOK ICON
' Call this ONCE at startup to populate g_app.pGpBookIcon
' ===============================================================================
SUB LoadBookIconData()
    INT totalBytes = 304 ' <-- REPLACE WITH EXACT BYTE COUNT FROM DATAmake OUTPUT
    INT hMem = 0
    POINTER pMemBuf = NULL
    POINTER pStream = NULL
    INT i = 0, bVal = 0

    IF totalBytes <= 0 THEN RETURN

    ' 1. Allocate movable memory block
    hMem = GlobalAlloc(0x0002, totalBytes) ' GMEM_MOVEABLE = 0x0002
    IF hMem = 0 THEN RETURN

    pMemBuf = GlobalLock(hMem)
    IF pMemBuf <> NULL THEN
        ' Reset data pointer to book icon DATA block
        RESTORE(png_help09a_Data)

        FOR i = 0 TO totalBytes - 1
            GETDATA(png_help09a_Data, bVal)
            #<CHAR>(pMemBuf + i) = (bVal & 0xFF)
        NEXT i

        GlobalUnlock(hMem)

        ' 2. Create IStream and instantiate GDI+ Image Handle
        IF CreateStreamOnHGlobal(hMem, 1, &pStream) = 0 THEN
            GdipLoadImageFromStream(pStream, &g_app.pGpBookIcon)
        ENDIF
    ENDIF
ENDSUB
' ===============================================================================
' EMBEDDED DATA: help09a ( 304 bytes)
' ===============================================================================
DATABEGIN png_help09a_Data
DATA 0x89, 0x50, 0x4E, 0x47, 0xD, 0xA, 0x1A, 0xA, 0x0, 0x0, 0x0, 0xD, 0x49, 0x48, 0x44, 0x52
DATA 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0, 0x20, 0x8, 0x6, 0x0, 0x0, 0x0, 0x73, 0x7A, 0x7A
DATA 0xF4, 0x0, 0x0, 0x0, 0xF7, 0x49, 0x44, 0x41, 0x54, 0x78, 0xDA, 0xED, 0xD7, 0xDD, 0xD, 0x82
DATA 0x30, 0x10, 0x0, 0xE0, 0xEB, 0x34, 0xFA, 0xE, 0xF, 0xC, 0xE1, 0x0, 0x6E, 0xC0, 0x18, 0xE2
DATA 0x18, 0x1D, 0xC0, 0xC4, 0x61, 0xCA, 0xBB, 0x23, 0x38, 0x4, 0xC9, 0x79, 0x55, 0x5B, 0x5B, 0x42
DATA 0xFF, 0x84, 0xD3, 0x97, 0x5E, 0xD2, 0xD0, 0x1F, 0xE0, 0x3E, 0x9A, 0x36, 0x29, 0x2, 0xFE, 0x1C
DATA 0xC2, 0xA9, 0x63, 0x62, 0x9C, 0xD, 0x60, 0x13, 0x23, 0x7E, 0xC, 0x42, 0x8, 0xF7, 0x1E, 0x5E
DATA 0x0, 0xDA, 0x8A, 0xF, 0x50, 0x4A, 0x41, 0xDB, 0xB6, 0xAC, 0x88, 0x24, 0x40, 0x7, 0x27, 0x22
DATA 0xB, 0xC0, 0x89, 0xC8, 0x6, 0x44, 0x10, 0x8, 0x65, 0x21, 0xE6, 0x8D, 0x22, 0x80, 0xEE, 0x9B
DATA 0xEE, 0x13, 0x74, 0x87, 0xEE, 0x95, 0x1D, 0xF3, 0xF3, 0x2F, 0x2D, 0xEC, 0x22, 0xC0, 0x38, 0x8E
DATA 0xD0, 0xF7, 0xFD, 0xB3, 0xAE, 0xC7, 0x9A, 0xA6, 0x29, 0xFB, 0x74, 0x7F, 0x61, 0x7F, 0xF, 0x30
DATA 0xFD, 0x6B, 0x0, 0x26, 0x67, 0x5, 0x54, 0x40, 0x5, 0x54, 0x40, 0x5, 0x54, 0x80, 0x7, 0x98
DATA 0x1F, 0x40, 0x7E, 0x5, 0xD0, 0x81, 0x27, 0x18, 0xE0, 0x4A, 0xE5, 0x12, 0x41, 0x70, 0x2, 0x60
DATA 0x47, 0x88, 0x1B, 0x5D, 0xF7, 0x54, 0x42, 0x8, 0x56, 0x40, 0xE, 0x82, 0x1D, 0x10, 0x42, 0x84
DATA 0x0, 0xEE, 0x9, 0x29, 0x37, 0x92, 0x80, 0x18, 0x42, 0x4A, 0x69, 0x1, 0xA6, 0x5D, 0x3A, 0xB
DATA 0xE6, 0x5D, 0x51, 0xC0, 0x12, 0xC2, 0x5, 0x6C, 0x11, 0x49, 0x80, 0x41, 0x1C, 0x69, 0x67, 0x9C
DATA 0xA9, 0xCC, 0x1F, 0xDE, 0x22, 0x92, 0x0, 0x78, 0x6F, 0xCF, 0xC1, 0x1, 0xC, 0xB, 0xA0, 0xB5
DATA 0x88, 0x60, 0xD0, 0x94, 0x63, 0x60, 0xCA, 0x37, 0xFB, 0x43, 0x7A, 0x0, 0x1B, 0x70, 0xB5, 0x19
DATA 0xDA, 0x50, 0xC4, 0x9B, 0x0, 0x0, 0x0, 0x0, 0x49, 0x45, 0x4E, 0x44, 0xAE, 0x42, 0x60, 0x82
DATAEND

' ===============================================================================
' ONE-TIME GDI+ IMAGE LOADER FROM DATA BLOCK
' Call this ONCE at startup to load g_app.pGpAboutLogo
' ===============================================================================
SUB LoadAboutLogoData()
    INT totalBytes = 2048 ' <-- Replace with exact byte count from DATAmake output
    INT hMem = 0
    POINTER pMemBuf = NULL
    POINTER pStream = NULL
    INT i = 0, bVal = 0

    IF totalBytes <= 0 THEN RETURN

    ' 1. Allocate movable memory block
    hMem = GlobalAlloc(0x0002, totalBytes) ' GMEM_MOVEABLE = 0x0002
    IF hMem = 0 THEN RETURN

    pMemBuf = GlobalLock(hMem)
    IF pMemBuf <> NULL THEN
       
        ' Restore data pointer to block
        RESTORE(png_logo_Data)

        FOR i = 0 TO totalBytes - 1
            GETDATA(png_logo_Data, bVal)
           
            ' Write byte directly into heap memory block
            #<CHAR>(pMemBuf + i) = (bVal & 0xFF)
        NEXT i

        GlobalUnlock(hMem)

        ' 3. Create IStream and construct GDI+ Image
        IF CreateStreamOnHGlobal(hMem, 1, &pStream) = 0 THEN
            GdipLoadImageFromStream(pStream, &g_app.pGpAboutLogo)
        ENDIF
    ENDIF
ENDSUB


' ===============================================================================
' EMBEDDED DATA: logo ( 1044 bytes)
' ===============================================================================
DATABEGIN png_logo_Data
DATA 0x89, 0x50, 0x4E, 0x47, 0xD, 0xA, 0x1A, 0xA, 0x0, 0x0, 0x0, 0xD, 0x49, 0x48, 0x44, 0x52
DATA 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x27, 0x8, 0x6, 0x0, 0x0, 0x0, 0xE0, 0xAC, 0x96
DATA 0x5C, 0x0, 0x0, 0x3, 0xDB, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9C, 0xED, 0x9C, 0x4B, 0x72, 0xE5
DATA 0x20, 0xC, 0x45, 0xED, 0x54, 0xF6, 0xBF, 0xE5, 0xD7, 0x23, 0xBA, 0x8, 0xF, 0xC3, 0x95, 0x90
DATA 0x40, 0x98, 0x7B, 0x46, 0xDD, 0x9, 0x6, 0xA1, 0x9F, 0x31, 0x88, 0x5C, 0x97, 0x1, 0x9F, 0xCF
DATA 0xF5, 0xB1, 0xE8, 0x87, 0x10, 0x32, 0x97, 0x5B, 0xD2, 0x78, 0x24, 0xD0, 0xEF, 0x5B, 0x36, 0x16
DATA 0x39, 0x3, 0xD4, 0xA7, 0xE8, 0x3F, 0x3E, 0x34, 0x95, 0x5A, 0x1A, 0xA7, 0x66, 0x84, 0xD4, 0xE6
DATA 0xC9, 0x40, 0x4F, 0x6, 0x3E, 0xCD, 0xA0, 0x35, 0x3D, 0x9C, 0xA6, 0x83, 0x44, 0xAE, 0xB, 0xA9
DATA 0xDF, 0xE4, 0x9C, 0xAA, 0xBF, 0x11, 0xBE, 0x62, 0xBA, 0xD5, 0x8, 0x51, 0x30, 0xDA, 0x56, 0x9A
DATA 0x8, 0x10, 0x27, 0xD1, 0xB4, 0x5D, 0xC1, 0x2E, 0xC1, 0xDF, 0xB, 0xBA, 0x11, 0x99, 0x47, 0x6C
DATA 0xC4, 0x97, 0x88, 0xD, 0x55, 0x3F, 0xAC, 0x35, 0x40, 0x15, 0xAB, 0x35, 0xAA, 0x64, 0x65, 0x81
DATA 0xF4, 0x2F, 0x69, 0x3B, 0x9B, 0xC8, 0xB2, 0xE5, 0x78, 0x26, 0x29, 0xA9, 0x5F, 0xB5, 0xFA, 0xB0
DATA 0x94, 0xEB, 0x24, 0x9E, 0xFC, 0xF0, 0x37, 0x6F, 0x30, 0x4B, 0xB1, 0xF7, 0x7D, 0xDD, 0xB9, 0x40
DATA 0x33, 0xC7, 0x5E, 0xC5, 0x2E, 0xF3, 0xB3, 0x96, 0xD3, 0x22, 0xF8, 0xD3, 0xF3, 0xDC, 0x6C, 0x1E
DATA 0xA7, 0xB4, 0xC3, 0xCF, 0x2A, 0x41, 0x4E, 0x60, 0x17, 0x87, 0xF5, 0x92, 0xD3, 0x2A, 0xF8, 0x73
DATA 0x76, 0x49, 0xA4, 0x91, 0x68, 0xD9, 0xF7, 0x27, 0x35, 0xB0, 0xFA, 0x2E, 0x43, 0x29, 0xC7, 0x6B
DATA 0xF5, 0x27, 0x91, 0x8D, 0xE, 0x42, 0x8, 0x4E, 0xF8, 0x15, 0x0, 0x83, 0x7F, 0x4F, 0x3C, 0x56
DATA 0x15, 0xB4, 0xAF, 0x3D, 0xBF, 0xFD, 0x26, 0x6B, 0x60, 0xE0, 0xBF, 0x3, 0xDA, 0x26, 0x36, 0xE1
DATA 0x57, 0x0, 0x64, 0x3F, 0x76, 0xD9, 0xFB, 0x20, 0x81, 0x57, 0x0, 0x1E, 0x75, 0x0, 0xC8, 0xA6
DATA 0x94, 0xD5, 0xD1, 0xA6, 0x16, 0xAB, 0xB3, 0x78, 0x9E, 0x9D, 0xCB, 0x6D, 0xA9, 0xDD, 0xB4, 0xD4
DATA 0xDA, 0x4C, 0x5A, 0x10, 0x25, 0x99, 0x3, 0x4A, 0xC8, 0x4, 0x90, 0x36, 0x25, 0xD3, 0x64, 0x5A
DATA 0x9B, 0x94, 0x68, 0x5B, 0xE4, 0xD8, 0xB1, 0x54, 0x1E, 0xB2, 0x39, 0xDA, 0x3A, 0xE7, 0x97, 0x18
DATA 0xC3, 0xAB, 0x9F, 0xA7, 0xDF, 0xBF, 0x3D, 0x11, 0x48, 0x6D, 0xA9, 0x49, 0xE0, 0xAD, 0xE0, 0x44
DATA 0xED, 0x20, 0x69, 0xD3, 0x8B, 0x3, 0x8D, 0x2C, 0x4B, 0xEA, 0x0, 0xD2, 0x78, 0xF9, 0xFF, 0xD3
DATA 0xD8, 0x52, 0x39, 0xAC, 0xB2, 0xE2, 0x88, 0x3, 0x8C, 0xEA, 0xCD, 0xBB, 0x50, 0xA6, 0x36, 0x37
DATA 0x2F, 0x7B, 0x47, 0x58, 0xFE, 0xE7, 0x73, 0xB3, 0x8, 0xC4, 0xD6, 0x73, 0x1A, 0x1D, 0xB6, 0xC6
DATA 0x9C, 0xED, 0x87, 0x21, 0xF6, 0x0, 0x72, 0xC1, 0x3D, 0xA, 0x51, 0xEE, 0xFB, 0xBA, 0x7B, 0xD9
DATA 0xBF, 0xD7, 0xA6, 0xF6, 0xCC, 0x75, 0xC5, 0x8, 0xFE, 0x1C, 0xB4, 0x9F, 0x37, 0xAF, 0x0, 0xBC
DATA 0xE7, 0x36, 0x1A, 0xFC, 0x88, 0xAF, 0xA1, 0xFE, 0x38, 0xEA, 0x3F, 0x3F, 0xF9, 0xC3, 0xB3, 0xB2
DATA 0xF7, 0xCC, 0xB2, 0xCE, 0x5E, 0xE0, 0x97, 0x6F, 0x42, 0x8F, 0xEF, 0xAC, 0xD5, 0xFD, 0x94, 0x73
DATA 0x7A, 0x6B, 0xF0, 0xCF, 0xF0, 0x5F, 0xEB, 0xFA, 0x97, 0xB2, 0xEF, 0x56, 0xE0, 0x4B, 0x3F, 0x33
DATA 0x10, 0xA6, 0xED, 0x1, 0x44, 0xBB, 0x10, 0x63, 0xB1, 0x4, 0x9E, 0xFD, 0xD6, 0xB6, 0xE8, 0x27
DATA 0x6A, 0xF0, 0x5B, 0x38, 0xF3, 0xCC, 0xB9, 0x79, 0xAD, 0x54, 0x35, 0xE3, 0x8D, 0xC8, 0xF2, 0x3F
DATA 0x1, 0xA4, 0x8D, 0xB4, 0xD1, 0xC0, 0xB0, 0xAA, 0xE8, 0x8B, 0xCA, 0x6E, 0x6F, 0xFF, 0xBC, 0x4D
DATA 0x54, 0xFD, 0x47, 0xD8, 0x37, 0x40, 0xF0, 0x94, 0x73, 0x76, 0x25, 0x6E, 0xE2, 0xCF, 0xA, 0xC0
DATA 0x2A, 0x9, 0x94, 0x7D, 0x5A, 0xF4, 0x63, 0x4D, 0x54, 0xB9, 0xAC, 0x39, 0x21, 0xF8, 0xA3, 0xCE
DATA 0xCD, 0xA, 0xCF, 0xF9, 0x7D, 0x7D, 0x2, 0xE4, 0x49, 0x40, 0x33, 0xF8, 0x89, 0x37, 0xFD, 0x22
DATA 0x12, 0xE5, 0xFA, 0x2C, 0x72, 0x84, 0x8B, 0xF6, 0x93, 0xFE, 0x7D, 0x92, 0x3F, 0x79, 0xCF, 0x35
DATA 0xC4, 0x29, 0x0, 0x21, 0x64, 0xD, 0xD5, 0x4, 0x90, 0xEF, 0x44, 0xE6, 0xAB, 0x1, 0x2D, 0xBB
DATA 0x7C, 0xE3, 0x59, 0xB2, 0x72, 0xCE, 0x3B, 0xBC, 0x2D, 0x3D, 0xEA, 0x3D, 0xC8, 0x5F, 0x90, 0xD8
DATA 0x6D, 0xAE, 0x0, 0x52, 0x22, 0x90, 0xFE, 0x31, 0x86, 0x53, 0x8C, 0xF5, 0xA4, 0x13, 0x69, 0xF0
DATA 0xB7, 0xFA, 0x91, 0x56, 0x1, 0xE6, 0x9F, 0x6E, 0x91, 0xED, 0xA0, 0x91, 0xCD, 0xF2, 0xA5, 0x34
DATA 0x8A, 0x95, 0xCD, 0xBC, 0x64, 0x41, 0x65, 0x80, 0x8F, 0x1, 0xB9, 0x17, 0x50, 0x27, 0xDA, 0xA9
DATA 0xC0, 0x6A, 0x1D, 0x9F, 0xF4, 0x97, 0x7B, 0x22, 0xCD, 0x53, 0x2B, 0xCB, 0xD4, 0x3D, 0x80, 0x8
DATA 0x99, 0x7B, 0x16, 0x91, 0x4F, 0x51, 0x50, 0x3B, 0x44, 0x4B, 0x6E, 0xA3, 0xD4, 0x6A, 0xEB, 0xA5
DATA 0xCF, 0x20, 0xAC, 0x4E, 0xC2, 0x9, 0x64, 0x15, 0xE8, 0x9A, 0x0, 0x3C, 0x8A, 0x25, 0x56, 0x38
DATA 0x93, 0x74, 0x5C, 0xE4, 0xC2, 0x86, 0x55, 0x3F, 0xB5, 0xEA, 0xB0, 0x5E, 0xAD, 0x39, 0x52, 0x1A
DATA 0xFD, 0xE6, 0x15, 0x1B, 0xFA, 0xA9, 0xA4, 0xD1, 0x81, 0x95, 0xED, 0x47, 0x81, 0x6F, 0xBC, 0x6A
DATA 0x3A, 0x7F, 0x9A, 0xC, 0x72, 0xC3, 0xE, 0x11, 0xB0, 0xF5, 0xAC, 0xC5, 0xD5, 0xCA, 0x91, 0x1B
DATA 0x7E, 0x4F, 0x72, 0xD5, 0xDA, 0x6A, 0xFA, 0xB1, 0xBE, 0xED, 0x85, 0xF4, 0xEF, 0x51, 0xA5, 0xE9
DATA 0x55, 0xF9, 0xA9, 0xD9, 0xE0, 0x44, 0x7C, 0x10, 0xF5, 0x53, 0x4B, 0x9F, 0x1C, 0xAD, 0xD1, 0xD0
DATA 0xCA, 0x9C, 0xFF, 0x5E, 0xB4, 0x2, 0x40, 0xDE, 0x2E, 0x3D, 0x61, 0x5A, 0x6D, 0x5B, 0xCF, 0x5A
DATA 0x6D, 0x6A, 0x49, 0xCB, 0x65, 0x6B, 0xED, 0x6B, 0xB5, 0xF5, 0x35, 0xF9, 0x34, 0xFD, 0xF4, 0x64
DATA 0x7B, 0x92, 0x77, 0xE4, 0x72, 0xC9, 0xAC, 0xBB, 0x2, 0xAB, 0x56, 0x70, 0x1A, 0xDD, 0x3F, 0xE9
DATA 0xCB, 0x5A, 0x57, 0x23, 0xCF, 0x6B, 0x64, 0xFE, 0x7A, 0xA6, 0x37, 0x88, 0x34, 0xE3, 0x3E, 0x2D
DATA 0x9B, 0x46, 0x56, 0x2, 0x8, 0x3B, 0x1C, 0x7D, 0x9D, 0x86, 0xB5, 0xCD, 0xA3, 0x57, 0x35, 0xEE
DATA 0xC8, 0x54, 0x45, 0x7A, 0x5E, 0x8, 0x62, 0x2, 0x88, 0x89, 0x55, 0x12, 0xA0, 0x7D, 0x7D, 0x58
DATA 0x5E, 0x9, 0x18, 0x65, 0x87, 0x98, 0xF8, 0xD0, 0xFA, 0x4, 0x44, 0x6D, 0xCF, 0xE0, 0xF7, 0x63
DATA 0x89, 0x32, 0xBD, 0x37, 0x9D, 0xE8, 0x24, 0x31, 0xD1, 0xDC, 0x14, 0xA5, 0x5D, 0x7D, 0x59, 0x7A
DATA 0x49, 0xA4, 0xFC, 0x59, 0xB9, 0x2B, 0x2B, 0x31, 0x38, 0x1D, 0x65, 0x3F, 0xA4, 0x1B, 0xC1, 0xC4
DATA 0x9E, 0xA5, 0xCA, 0x6D, 0x7D, 0x1F, 0x6A, 0x13, 0x0, 0x1D, 0x86, 0x10, 0x9C, 0x10, 0xC1, 0x62
DATA 0xF1, 0x47, 0x44, 0xB8, 0x2, 0x20, 0x44, 0x4E, 0x98, 0x40, 0x19, 0x4D, 0x2, 0x6F, 0xAD, 0x5C
DATA 0x23, 0xC4, 0x93, 0x70, 0x1, 0x23, 0x3D, 0x36, 0xE2, 0xD2, 0x9F, 0x10, 0x3D, 0x61, 0x83, 0x86
DATA 0xD7, 0x8F, 0x9, 0xF1, 0x27, 0x7C, 0xE0, 0xF4, 0x12, 0x1, 0x83, 0x9F, 0x10, 0x3D, 0xFF, 0x0
DATA 0x12, 0x8, 0xF, 0x85, 0x18, 0x6B, 0xE7, 0x8B, 0x0, 0x0, 0x0, 0x0, 0x49, 0x45, 0x4E, 0x44
DATA 0xAE, 0x42, 0x60, 0x82
DATAEND