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https://github.com/AppleWin/AppleWin.git
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Extended .do & .po support for 140KB+n*4KB disk images
where n=[35..40]
This commit is contained in:
tomch
parent
44872bf99e
commit
a73a1a9b2e
@ -1,10 +1,12 @@
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#pragma once
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#define DRIVE_1 0
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#define DRIVE_2 1
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#define DRIVE_1 0
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#define DRIVE_2 1
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#define DRIVES 2
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#define TRACKS 35
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#define DRIVES 2
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#define TRACKS_STANDARD 35
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#define TRACKS_EXTRA 5 // Allow up to a 40-track .dsk image (160KB)
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#define TRACKS (TRACKS_STANDARD+TRACKS_EXTRA)
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extern BOOL enhancedisk;
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extern string DiskPathFilename[2];
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@ -155,7 +155,7 @@ LPBYTE Code62 (int sector) {
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// STARTING AT 4K INTO THE WORK BUFFER.
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{
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LPBYTE sectorbase = workbuffer+(sector << 8);
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LPBYTE resultptr = workbuffer+0x1000;
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LPBYTE resultptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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BYTE offset = 0xAC;
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while (offset != 0x02) {
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BYTE value = 0;
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@ -180,8 +180,8 @@ LPBYTE Code62 (int sector) {
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// BLOCK OF 343 BYTES STARTING AT 5K INTO THE WORK BUFFER.
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{
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BYTE savedval = 0;
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LPBYTE sourceptr = workbuffer+0x1000;
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LPBYTE resultptr = workbuffer+0x1400;
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LPBYTE sourceptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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LPBYTE resultptr = workbuffer+TRACK_DENIBBLIZED_SIZE+0x400;
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int loop = 342;
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while (loop--) {
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*(resultptr++) = savedval ^ *sourceptr;
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@ -196,14 +196,14 @@ LPBYTE Code62 (int sector) {
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// ZERO BITS. THE CONVERTED BLOCK OF 343 BYTES IS STORED STARTING AT 4K
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// INTO THE WORK BUFFER.
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{
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LPBYTE sourceptr = workbuffer+0x1400;
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LPBYTE resultptr = workbuffer+0x1000;
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LPBYTE sourceptr = workbuffer+TRACK_DENIBBLIZED_SIZE+0x400;
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LPBYTE resultptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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int loop = 343;
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while (loop--)
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*(resultptr++) = diskbyte[(*(sourceptr++)) >> 2];
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}
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return workbuffer+0x1000;
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return workbuffer+TRACK_DENIBBLIZED_SIZE;
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}
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//===========================================================================
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@ -225,8 +225,8 @@ void Decode62 (LPBYTE imageptr) {
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// USING OUR TABLE, CONVERT THE DISK BYTES BACK INTO 6-BIT BYTES
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{
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LPBYTE sourceptr = workbuffer+0x1000;
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LPBYTE resultptr = workbuffer+0x1400;
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LPBYTE sourceptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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LPBYTE resultptr = workbuffer+TRACK_DENIBBLIZED_SIZE+0x400;
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int loop = 343;
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while (loop--)
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*(resultptr++) = sixbitbyte[*(sourceptr++) & 0x7F];
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@ -236,8 +236,8 @@ void Decode62 (LPBYTE imageptr) {
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// TO UNDO THE EFFECTS OF THE CHECKSUMMING PROCESS
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{
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BYTE savedval = 0;
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LPBYTE sourceptr = workbuffer+0x1400;
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LPBYTE resultptr = workbuffer+0x1000;
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LPBYTE sourceptr = workbuffer+TRACK_DENIBBLIZED_SIZE+0x400;
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LPBYTE resultptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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int loop = 342;
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while (loop--) {
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*resultptr = savedval ^ *(sourceptr++);
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@ -247,8 +247,8 @@ void Decode62 (LPBYTE imageptr) {
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// CONVERT THE 342 6-BIT BYTES INTO 256 8-BIT BYTES
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{
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LPBYTE lowbitsptr = workbuffer+0x1000;
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LPBYTE sectorbase = workbuffer+0x1056;
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LPBYTE lowbitsptr = workbuffer+TRACK_DENIBBLIZED_SIZE;
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LPBYTE sectorbase = workbuffer+TRACK_DENIBBLIZED_SIZE+0x56;
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BYTE offset = 0xAC;
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while (offset != 0x02) {
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if (offset >= 0xAC)
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@ -272,7 +272,7 @@ void Decode62 (LPBYTE imageptr) {
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//===========================================================================
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void DenibblizeTrack (LPBYTE trackimage, BOOL dosorder, int nibbles) {
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ZeroMemory(workbuffer,0x1000);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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// SEARCH THROUGH THE TRACK IMAGE FOR EACH SECTOR. FOR EVERY SECTOR
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// WE FIND, COPY THE NIBBLIZED DATA FOR THAT SECTOR INTO THE WORK
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@ -299,13 +299,13 @@ void DenibblizeTrack (LPBYTE trackimage, BOOL dosorder, int nibbles) {
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int loop = 0;
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int tempoffset = offset;
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while (loop < 384) {
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*(workbuffer+0x1000+loop++) = *(trackimage+tempoffset++);
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*(workbuffer+TRACK_DENIBBLIZED_SIZE+loop++) = *(trackimage+tempoffset++);
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if (tempoffset >= nibbles)
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tempoffset = 0;
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}
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if (byteval[2] == 0x96)
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sector = ((*(workbuffer+0x1004) & 0x55) << 1)
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| (*(workbuffer+0x1005) & 0x55);
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sector = ((*(workbuffer+TRACK_DENIBBLIZED_SIZE+4) & 0x55) << 1)
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| (*(workbuffer+TRACK_DENIBBLIZED_SIZE+5) & 0x55);
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else if (byteval[2] == 0xAD) {
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Decode62(workbuffer+(sectornumber[dosorder][sector] << 8));
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sector = 0;
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@ -317,7 +317,7 @@ void DenibblizeTrack (LPBYTE trackimage, BOOL dosorder, int nibbles) {
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//===========================================================================
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DWORD NibblizeTrack (LPBYTE trackimagebuffer, BOOL dosorder, int track) {
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ZeroMemory(workbuffer+4096,4096);
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ZeroMemory(workbuffer+TRACK_DENIBBLIZED_SIZE,TRACK_DENIBBLIZED_SIZE);
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LPBYTE imageptr = trackimagebuffer;
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BYTE sector = 0;
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@ -422,6 +422,28 @@ DWORD AplDetect (LPBYTE imageptr, DWORD imagesize) {
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((length+4+((256-((length+4) & 255)) & 255)) == imagesize));
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}
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//===========================================================================
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static bool IsValidImageSize(DWORD uImageSize)
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{
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if ((TRACKS>TRACKS_STANDARD) && (uImageSize > TRACKS*TRACK_DENIBBLIZED_SIZE))
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return false; // >160KB
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if (uImageSize >= TRACKS_STANDARD*TRACK_DENIBBLIZED_SIZE)
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{
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// Is uImageSize == 140KB + n*4K?
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const bool bStandardSize = (((uImageSize - TRACKS_STANDARD*TRACK_DENIBBLIZED_SIZE) % TRACK_DENIBBLIZED_SIZE) == 0);
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if (bStandardSize)
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return true;
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}
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const bool bInvalidSize = ( ((uImageSize < 143105) || (uImageSize > 143364)) &&
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(uImageSize != 143403) &&
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(uImageSize != 143488) );
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return !bInvalidSize;
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}
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/****************************************************************************
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*
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* DOS ORDER (DO) FORMAT IMPLEMENTATION
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@ -429,10 +451,10 @@ DWORD AplDetect (LPBYTE imageptr, DWORD imagesize) {
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***/
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//===========================================================================
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DWORD DoDetect (LPBYTE imageptr, DWORD imagesize) {
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if (((imagesize < 143105) || (imagesize > 143364)) &&
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(imagesize != 143403) && (imagesize != 143488))
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return 0;
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DWORD DoDetect (LPBYTE imageptr, DWORD imagesize)
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{
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if (!IsValidImageSize(imagesize))
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return 0;
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// CHECK FOR A DOS ORDER IMAGE OF A DOS DISKETTE
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{
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@ -463,9 +485,9 @@ DWORD DoDetect (LPBYTE imageptr, DWORD imagesize) {
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//===========================================================================
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void DoRead (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimagebuffer, int *nibbles) {
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SetFilePointer(ptr->file,ptr->offset+(track << 12),NULL,FILE_BEGIN);
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ZeroMemory(workbuffer,4096);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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DWORD bytesread;
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ReadFile(ptr->file,workbuffer,4096,&bytesread,NULL);
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ReadFile(ptr->file,workbuffer,TRACK_DENIBBLIZED_SIZE,&bytesread,NULL);
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*nibbles = NibblizeTrack(trackimagebuffer,1,track);
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if (!enhancedisk)
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SkewTrack(track,*nibbles,trackimagebuffer);
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@ -473,11 +495,11 @@ void DoRead (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimagebuf
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//===========================================================================
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void DoWrite (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimage, int nibbles) {
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ZeroMemory(workbuffer,4096);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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DenibblizeTrack(trackimage,1,nibbles);
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SetFilePointer(ptr->file,ptr->offset+(track << 12),NULL,FILE_BEGIN);
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DWORD byteswritten;
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WriteFile(ptr->file,workbuffer,4096,&byteswritten,NULL);
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WriteFile(ptr->file,workbuffer,TRACK_DENIBBLIZED_SIZE,&byteswritten,NULL);
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}
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/****************************************************************************
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@ -529,9 +551,9 @@ void IieRead (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimagebu
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if (*(ptr->header+13) <= 2) {
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IieConvertSectorOrder(ptr->header+14);
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SetFilePointer(ptr->file,(track << 12)+30,NULL,FILE_BEGIN);
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ZeroMemory(workbuffer,4096);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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DWORD bytesread;
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ReadFile(ptr->file,workbuffer,4096,&bytesread,NULL);
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ReadFile(ptr->file,workbuffer,TRACK_DENIBBLIZED_SIZE,&bytesread,NULL);
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*nibbles = NibblizeTrack(trackimagebuffer,2,track);
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}
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@ -610,10 +632,10 @@ void Nib2Write (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimage
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***/
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//===========================================================================
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DWORD PoDetect (LPBYTE imageptr, DWORD imagesize) {
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if (((imagesize < 143105) || (imagesize > 143364)) &&
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(imagesize != 143488))
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return 0;
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DWORD PoDetect (LPBYTE imageptr, DWORD imagesize)
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{
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if (!IsValidImageSize(imagesize))
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return 0;
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// CHECK FOR A PRODOS ORDER IMAGE OF A DOS DISKETTE
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{
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@ -644,9 +666,9 @@ DWORD PoDetect (LPBYTE imageptr, DWORD imagesize) {
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//===========================================================================
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void PoRead (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimagebuffer, int *nibbles) {
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SetFilePointer(ptr->file,ptr->offset+(track << 12),NULL,FILE_BEGIN);
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ZeroMemory(workbuffer,4096);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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DWORD bytesread;
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ReadFile(ptr->file,workbuffer,4096,&bytesread,NULL);
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ReadFile(ptr->file,workbuffer,TRACK_DENIBBLIZED_SIZE,&bytesread,NULL);
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*nibbles = NibblizeTrack(trackimagebuffer,0,track);
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if (!enhancedisk)
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SkewTrack(track,*nibbles,trackimagebuffer);
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@ -654,11 +676,11 @@ void PoRead (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimagebuf
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//===========================================================================
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void PoWrite (imageinfoptr ptr, int track, int quartertrack, LPBYTE trackimage, int nibbles) {
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ZeroMemory(workbuffer,4096);
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ZeroMemory(workbuffer,TRACK_DENIBBLIZED_SIZE);
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DenibblizeTrack(trackimage,0,nibbles);
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SetFilePointer(ptr->file,ptr->offset+(track << 12),NULL,FILE_BEGIN);
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DWORD byteswritten;
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WriteFile(ptr->file,workbuffer,4096,&byteswritten,NULL);
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WriteFile(ptr->file,workbuffer,TRACK_DENIBBLIZED_SIZE,&byteswritten,NULL);
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}
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/****************************************************************************
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@ -732,7 +754,7 @@ void ImageDestroy () {
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//===========================================================================
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void ImageInitialize () {
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workbuffer = (LPBYTE)VirtualAlloc(NULL,0x2000,MEM_COMMIT,PAGE_READWRITE);
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workbuffer = (LPBYTE)VirtualAlloc(NULL, TRACK_DENIBBLIZED_SIZE*2, MEM_COMMIT, PAGE_READWRITE);
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}
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//===========================================================================
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@ -1,8 +1,8 @@
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#pragma once
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#define TRACKS 35
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#define IMAGETYPES 7
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#define NIBBLES 6656
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#define TRACK_DENIBBLIZED_SIZE 4096
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BOOL ImageBoot (HIMAGE);
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void ImageClose (HIMAGE);
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