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| author | Juan J. Martinez <jjm@usebox.net> | 2021-05-03 08:21:10 +0100 |
|---|---|---|
| committer | Juan J. Martinez <jjm@usebox.net> | 2021-05-03 10:00:00 +0100 |
| commit | c3b0fa04a663fe233765b83d3be41a42aa08c25d (patch) | |
| tree | 0befda349001ef6ce306b39378f9c70ad917363e /tools/2CDT/src/tzxfile.c | |
| download | return-of-traxtor-cpc-c3b0fa04a663fe233765b83d3be41a42aa08c25d.tar.gz return-of-traxtor-cpc-c3b0fa04a663fe233765b83d3be41a42aa08c25d.zip | |
Diffstat (limited to 'tools/2CDT/src/tzxfile.c')
| -rw-r--r-- | tools/2CDT/src/tzxfile.c | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/tools/2CDT/src/tzxfile.c b/tools/2CDT/src/tzxfile.c new file mode 100644 index 0000000..3f550b0 --- /dev/null +++ b/tools/2CDT/src/tzxfile.c @@ -0,0 +1,445 @@ +/*
+ * 2CDT Copyright (c) Kevin Thacker
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+/* TZX file support */
+#include "tzxfile.h"
+/* header for TZX file */
+const unsigned char *TZX_FileHeader = (const unsigned char *)"ZXTape!\x1a";
+
+/* the internal format for the TZX is a link-list system.
+Blocks can be edited. A new file can be written with the new data */
+
+
+
+/**************************************/
+/* insert block after block specified */
+void TZX_InsertBlockAfter(TZX_FILE *pFile,TZX_BLOCK *pBlock, TZX_BLOCK *pPrev)
+{
+ /* setup block pointers */
+ pBlock->pPrev = pPrev;
+ pBlock->pNext = pPrev->pNext;
+
+ /* setup pointers for block before */
+ pPrev->pNext = pBlock;
+}
+
+/***************************************/
+/* insert block before block specified */
+void TZX_InsertBlockBefore(TZX_FILE *pFile, TZX_BLOCK *pBlock, TZX_BLOCK *pNext)
+{
+ /* setup block pointers */
+ pBlock->pNext = pNext;
+ pBlock->pPrev = pNext->pPrev;
+
+ /* setup pointers for block before */
+ pNext->pPrev = pBlock;
+
+ /* is block we are inserting after the first in the list? */
+ if (pFile->pFirstBlock == pNext)
+ {
+ /* yes. New block is now the start of the list */
+ pFile->pFirstBlock = pBlock;
+ }
+}
+
+
+/*****************************************/
+/* insert a block at the end of the file */
+void TZX_AddBlockToEndOfFile(TZX_FILE *pFile, TZX_BLOCK *pBlock)
+{
+ /* blocks in file? */
+ if (pFile->pFirstBlock==NULL)
+ {
+ /* no */
+ pFile->pFirstBlock = pBlock;
+ }
+ else
+ {
+ /* yes */
+ TZX_BLOCK *pCurrentBlock;
+
+ /* search for last block in list */
+ pCurrentBlock = pFile->pFirstBlock;
+
+ while (pCurrentBlock->pNext!=NULL)
+ pCurrentBlock = pCurrentBlock->pNext;
+
+ TZX_InsertBlockAfter(pFile,pBlock, pCurrentBlock);
+ }
+}
+
+/********************************/
+/* detach block from block list */
+void TZX_DetachBlock(TZX_FILE *pFile,TZX_BLOCK *pBlock)
+{
+ /* block before this block? */
+ if (pBlock->pPrev!=NULL)
+ {
+ /* yes */
+ pBlock->pPrev->pNext = pBlock->pNext;
+ }
+ else
+ {
+ /* no, this block is first in list */
+ pFile->pFirstBlock = pBlock->pNext;
+ }
+
+ /* block after this block? */
+ if (pBlock->pNext!=NULL)
+ {
+ /* yes */
+ pBlock->pNext->pPrev = pBlock->pPrev;
+ }
+}
+
+/************************/
+/* free data in a block */
+void TZX_FreeBlock(TZX_BLOCK *pBlock)
+{
+ /* free it */
+ free(pBlock);
+}
+
+
+
+/******************************/
+/* create a internal TZX file */
+
+TZX_FILE *TZX_CreateFile(unsigned char VersionMajor, unsigned char VersionMinor)
+{
+ TZX_FILE *pTZXFile;
+
+ /* alloc the header */
+ pTZXFile = malloc(sizeof(TZX_FILE));
+
+ if (pTZXFile!=NULL)
+ {
+ /* set version */
+ pTZXFile->VersionMajor = VersionMajor;
+ pTZXFile->VersionMinor = VersionMinor;
+
+ /* initialise block linked list */
+ pTZXFile->pFirstBlock = NULL;
+ }
+
+ return pTZXFile;
+}
+
+/*******************/
+/* free a TZX file */
+
+void TZX_FreeFile(TZX_FILE *pFile)
+{
+ TZX_BLOCK *pBlock;
+
+ pBlock = pFile->pFirstBlock;
+
+ while (pBlock!=NULL)
+ {
+ TZX_BLOCK *pNextBlock = pBlock->pNext;
+
+ /* remove block from list */
+ TZX_DetachBlock(pFile, pBlock);
+
+ /* free TZX block */
+ TZX_FreeBlock(pBlock);
+
+ pBlock = pNextBlock;
+ }
+
+ /* free TZX file header */
+ free(pFile);
+}
+
+/*****************************************************************************************************/
+/* write a TZX file */
+
+void TZX_WriteBlocks(TZX_FILE *pTZXFile, FILE *fh)
+{
+ TZX_BLOCK *pBlock;
+
+ /* get pointer to first block */
+ pBlock = pTZXFile->pFirstBlock;
+
+ /* write each block in turn to file */
+ while (pBlock!=NULL)
+ {
+ if (pBlock->pBlockHeader!=NULL)
+ {
+ BOOL BlockHasData;
+ int BlockHeaderSize;
+ unsigned char BlockID;
+
+ /* get block ID */
+ BlockID = pBlock->pBlockHeader[0];
+ /* get size of header */
+ BlockHeaderSize = TZX_GetBlockHeaderSize(BlockID);
+ /* does block have additional data ? */
+ BlockHasData = TZX_BlockHasData(BlockID);
+
+ if ((!BlockHasData) || ((BlockHasData) && (pBlock->pBlockData!=NULL)))
+ {
+ /* block requires data and has data, or block doesn't require data */
+
+ /* write the header */
+ fwrite(pBlock->pBlockHeader, BlockHeaderSize, sizeof(unsigned char), fh);
+
+ if (pBlock->pBlockData!=NULL)
+ {
+ /* write the data */
+
+ fwrite(pBlock->pBlockData, pBlock->DataBlockSize, sizeof(unsigned char), fh);
+ }
+ }
+ }
+
+ /* next block */
+ pBlock = pBlock->pNext;
+ }
+}
+
+
+void TZX_AppendFile(TZX_FILE *pTZXFile, unsigned char *pFilename)
+{
+ FILE *fh;
+
+ /* open TZX file */
+ fh = fopen((const char *)pFilename,"r+b");
+
+ if (fh!=NULL)
+ {
+ TZX_BLOCK *pBlock;
+
+ fseek(fh, 0, SEEK_END);
+
+ TZX_WriteBlocks(pTZXFile, fh);
+
+ /* close TZX file */
+ fclose(fh);
+ }
+}
+
+
+void TZX_WriteFile(TZX_FILE *pTZXFile, unsigned char *pFilename)
+{
+ FILE *fh;
+
+ /* open TZX file */
+ fh = fopen((const char *)pFilename,"wb");
+
+ if (fh!=NULL)
+ {
+ TZX_BLOCK *pBlock;
+
+ /* write header */
+ fwrite(TZX_FileHeader, 8, sizeof(unsigned char), fh);
+ /* write version numbers */
+ fwrite(&pTZXFile->VersionMajor, 1, sizeof(unsigned char), fh);
+ fwrite(&pTZXFile->VersionMinor, 1, sizeof(unsigned char), fh);
+
+ TZX_WriteBlocks(pTZXFile, fh);
+
+ /* close TZX file */
+ fclose(fh);
+ }
+}
+
+void TZX_SetupPauseBlock(TZX_BLOCK *pBlock,unsigned long PauseInMilliseconds)
+{
+ unsigned char *pHeader = TZX_GetBlockHeaderPtr(pBlock);
+
+ if (pHeader!=NULL)
+ {
+ if (pHeader[0] == TZX_PAUSE_BLOCK)
+ {
+ pHeader[1] = (unsigned char)PauseInMilliseconds;
+ pHeader[2] = (unsigned char)(PauseInMilliseconds>>8);
+ }
+ }
+}
+
+/*****************************************************************************************************/
+
+/* given a TZX block ID, this returns the size of the header */
+int TZX_GetBlockHeaderSize(unsigned char ID)
+{
+ switch (ID)
+ {
+ case TZX_STANDARD_SPEED_DATA_BLOCK:
+ return 4+1;
+ case TZX_TURBO_LOADING_DATA_BLOCK:
+ return 18+1;
+
+ case TZX_PAUSE_BLOCK:
+ return 2+1;
+ case TZX_PURE_DATA_BLOCK:
+ return 0x0a + 1;
+ case TZX_DIRECT_RECORDING_BLOCK:
+ return 0x08 + 1;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/*****************************************************************************************************/
+/* return TRUE if the block has additional data, false if not */
+BOOL TZX_BlockHasData(unsigned char ID)
+{
+ switch (ID)
+ {
+ case TZX_STANDARD_SPEED_DATA_BLOCK:
+ case TZX_TURBO_LOADING_DATA_BLOCK:
+ case TZX_PURE_DATA_BLOCK:
+ case TZX_DIRECT_RECORDING_BLOCK:
+ return TRUE;
+
+ case TZX_PAUSE_BLOCK:
+ return FALSE;
+
+ default:
+ break;
+ }
+
+ return FALSE;
+
+}
+
+/*****************************************************************************************************/
+/* set block size */
+void TZX_SetBlockSizeInHeader(TZX_BLOCK *pBlock, unsigned long Size)
+{
+ unsigned char ID = pBlock->pBlockHeader[0];
+ unsigned char *pBlockData;
+
+ pBlockData = &pBlock->pBlockHeader[1];
+
+ switch (ID)
+ {
+ case TZX_STANDARD_SPEED_DATA_BLOCK:
+ {
+ pBlockData[2] = (unsigned char)Size;
+ pBlockData[3] = (unsigned char)(Size>>8);
+
+ }
+ break;
+
+ case TZX_TURBO_LOADING_DATA_BLOCK:
+ {
+ pBlockData[0x0f] = (unsigned char)Size;
+ pBlockData[0x010] = (unsigned char)(Size>>8);
+ pBlockData[0x011] = (unsigned char)(Size>>16);
+
+ }
+ break;
+
+ case TZX_PURE_DATA_BLOCK:
+ {
+ pBlockData[0x07] = (unsigned char)Size;
+ pBlockData[0x08] = (unsigned char)(Size>>8);
+ pBlockData[0x09] = (unsigned char)(Size>>16);
+ }
+ break;
+
+ case TZX_DIRECT_RECORDING_BLOCK:
+ {
+ pBlockData[0x05] = (unsigned char)Size;
+ pBlockData[0x06] = (unsigned char)(Size>>8);
+ pBlockData[0x07] = (unsigned char)(Size>>16);
+ }
+ break;
+
+ default:
+ break;
+ }
+}
+
+
+/*****************************************************************************************************/
+/* create a block of the specified ID in the TZX image file */
+TZX_BLOCK *TZX_CreateBlock(unsigned char ID)
+{
+ TZX_BLOCK *pBlock;
+
+ pBlock = malloc(sizeof(TZX_BLOCK));
+
+ if (pBlock!=NULL)
+ {
+ int BlockHeaderSize;
+
+ /* reset block data */
+ memset(pBlock, 0, sizeof(TZX_BLOCK));
+
+ BlockHeaderSize = TZX_GetBlockHeaderSize(ID);
+
+ pBlock->pBlockHeader = malloc(BlockHeaderSize);
+
+ if (pBlock->pBlockHeader!=NULL)
+ {
+ pBlock->pBlockHeader[0] = ID;
+ }
+ }
+
+ return pBlock;
+}
+
+/*****************************************************************************************************/
+/* create a block of the specified ID in the TZX image file */
+void TZX_AddDataToBlock(TZX_BLOCK *pBlock, int DataSize)
+{
+ /* only add data if a header exists */
+ if (pBlock->pBlockHeader!=NULL)
+ {
+ /* get block id */
+ unsigned char BlockID = pBlock->pBlockHeader[0];
+
+ /* does this block ID have additional data? */
+ if (TZX_BlockHasData(BlockID))
+ {
+ /* allocate memory for the additional data */
+ pBlock->pBlockData = malloc(DataSize);
+
+ if (pBlock->pBlockData!=NULL)
+ {
+ pBlock->DataBlockSize = DataSize;
+
+ /* set size in TZX header */
+ TZX_SetBlockSizeInHeader(pBlock, DataSize);
+ }
+ }
+ }
+}
+
+/*****************************************************************************************************/
+/* get pointer to TZX data block */
+unsigned char *TZX_GetBlockDataPtr(TZX_BLOCK *pBlock)
+{
+ return pBlock->pBlockData;
+}
+
+/*****************************************************************************************************/
+/* get pointer to TZX data block */
+unsigned char *TZX_GetBlockHeaderPtr(TZX_BLOCK *pBlock)
+{
+ return pBlock->pBlockHeader;
+}
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