Initial import for public releaseHEADmain

4 files changed, 1850 insertions, 0 deletions

diff --git a/tools/2CDT/src/2cdt.c b/tools/2CDT/src/2cdt.c
new file mode 100644
index 0000000..c3fb520
--- /dev/null
+++ b/tools/2CDT/src/2cdt.c
@@ -0,0 +1,1290 @@
+/*
+ *  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.
+ */
+
+
+/* The following program is designed to create a .tzx/.cdt from a tape-file stored
+on the PC */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef UNIX
+#include <sys/io.h>
+#else
+#include <io.h>
+#endif
+#include "defs.h"
+#include "tzxfile.h"
+#include "getopt.h"

+
+#if defined(_MSC_VER) || defined(__BORLANDC__)

+typedef unsigned __int64 ulong64;

+typedef signed __int64 long64;

+#else

+typedef unsigned long long ulong64;

+typedef signed long long long64;

+#endif

+
+enum
+{
+    CPC_METHOD_BLOCKS = 0,
+    CPC_METHOD_HEADERLESS,
+    CPC_METHOD_SPECTRUM,
+};
+
+static int ExecutionAddress;
+static BOOL ExecutionAddressOverride;
+static int LoadAddress;
+static BOOL  LoadAddressOverride;
+static int Type;
+static BOOL TypeOverride;
+static int Pause;
+static BOOL BuggyEmuExtraPause;
+
+#define MAXFILELEN 16
+
+static int BaudRate;                /* baud rate to write data */
+static int TZXWriteMethod;          /* method to write data into TZX file */
+static BOOL BlankBeforeUse;         /* blank existing CDT file before use */
+static int CPCMethod = CPC_METHOD_BLOCKS;
+
+/* I am using a enum, so that I can poke data into structures without
+worrying how the compiler has aligned it */
+enum
+{
+	CPC_TAPE_HEADER_FILENAME_BYTE0 = 0,
+	CPC_TAPE_HEADER_FILENAME_BYTE1,
+	CPC_TAPE_HEADER_FILENAME_BYTE2,
+	CPC_TAPE_HEADER_FILENAME_BYTE3,
+	CPC_TAPE_HEADER_FILENAME_BYTE4,
+	CPC_TAPE_HEADER_FILENAME_BYTE5,
+	CPC_TAPE_HEADER_FILENAME_BYTE6,
+	CPC_TAPE_HEADER_FILENAME_BYTE7,
+	CPC_TAPE_HEADER_FILENAME_BYTE8,
+	CPC_TAPE_HEADER_FILENAME_BYTE9,
+	CPC_TAPE_HEADER_FILENAME_BYTE10,
+	CPC_TAPE_HEADER_FILENAME_BYTE11,
+	CPC_TAPE_HEADER_FILENAME_BYTE12,
+	CPC_TAPE_HEADER_FILENAME_BYTE13,
+	CPC_TAPE_HEADER_FILENAME_BYTE14,
+	CPC_TAPE_HEADER_FILENAME_BYTE15,
+	CPC_TAPE_HEADER_BLOCK_NUMBER,
+	CPC_TAPE_HEADER_LAST_BLOCK_FLAG,
+	CPC_TAPE_HEADER_FILE_TYPE,
+	CPC_TAPE_HEADER_DATA_LENGTH_LOW,
+	CPC_TAPE_HEADER_DATA_LENGTH_HIGH,
+	CPC_TAPE_HEADER_DATA_LOCATION_LOW,
+	CPC_TAPE_HEADER_DATA_LOCATION_HIGH,
+	CPC_TAPE_HEADER_FIRST_BLOCK_FLAG,
+	CPC_TAPE_HEADER_DATA_LOGICAL_LENGTH_LOW,
+	CPC_TAPE_HEADER_DATA_LOGICAL_LENGTH_HIGH,
+	CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_LOW,
+	CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_HIGH,
+} CPC_TAPE_HEADER_ENUM;
+
+/* size of header */
+#define CPC_TAPE_HEADER_SIZE	64
+
+/* load a file into memory */
+BOOL	Host_LoadFile(const char *Filename, unsigned char **pLocation, unsigned long *pLength)
+{
+	FILE	*fh;
+	unsigned char	*pData;
+
+	*pLocation = NULL;
+	*pLength = 0;
+
+	if (Filename!=NULL)
+	{
+		if (strlen(Filename)!=0)
+		{
+			fh = fopen(Filename,"rb");
+
+			if (fh!=NULL)
+			{
+				int FileSize;
+
+#ifdef WIN32
+				int FNo;
+
+				FNo = _fileno(fh);
+				FileSize = _filelength(FNo);
+#else
+				unsigned long CurrentPosition;
+				CurrentPosition = ftell(fh);
+				fseek(fh, 0, SEEK_END);
+				FileSize = ftell(fh);
+				fseek(fh, CurrentPosition, SEEK_SET);
+#endif
+				if (FileSize!=0)
+				{
+					pData = (unsigned char *)malloc(FileSize);
+
+					if (pData!=NULL)
+					{
+						if (fread(pData,1,FileSize,fh)==FileSize)
+						{
+							*pLocation = pData;
+							*pLength = FileSize;
+							fclose(fh);
+							return TRUE;
+						}
+
+						free(pData);
+					}
+				}
+
+				fclose(fh);
+			}
+		}
+	}
+
+	return FALSE;
+}
+
+
+/* calculate checksum as AMSDOS would for the first 66 bytes of a datablock */
+/* this is used to determine if a file has a AMSDOS header */
+unsigned int AMSDOS_CalculateChecksum(unsigned char *pHeader)
+{
+        unsigned int Checksum;
+        int i;
+
+        Checksum = 0;
+
+        for (i=0; i<67; i++)
+        {
+                unsigned int CheckSumByte;
+
+                CheckSumByte = pHeader[i] & 0x0ff;
+
+                Checksum+=CheckSumByte;
+        }
+
+        return Checksum;
+}
+
+/* CRC code shamelessly taken from Pierre Guerrier's AIFF decoder! */
+#define kCRCpoly  4129  /* used for binary long division in CRC */
+
+/* CRC polynomial: X^16+X^12+X^5+1 */
+unsigned int CRCupdate(unsigned int CRC, unsigned char new)
+{
+ unsigned int aux = CRC ^ (new << 8);
+ int i;
+
+ for(i=0; i<8; i++)
+   if (aux & 0x8000)
+       aux = (aux <<= 1) ^ kCRCpoly;
+     else
+       aux <<= 1;
+
+ return(aux);
+}
+
+/*
+ID : 11  -  Turbo loading data block
+-------
+        This block is very similar  to  the  normal  TAP  block but  with  some
+        additional   info  on  the  timings  and  other  important differences.
+        The same tape encoding is used as for the standard speed data block.
+        If a  block should  use some  non-standard  sync or  pilot  tones  (for
+        example all sorts of protection schemes) then use the next three blocks
+        to describe it.
+
+00 2  Length of PILOT pulse                                              [2168]
+02 2  Length of SYNC First pulse                                          [667]
+04 2  Length of SYNC Second pulse                                         [735]
+06 2  Length of ZERO bit pulse                                            [855]
+08 2  Length of ONE bit pulse                                            [1710]
+0A 2  Length of PILOT tone (in PILOT pulses)           [8064 Header, 3220 Data]
+0C 1  Used bits in last byte (other bits should be 0)                       [8]
+      i.e. if this is 6 then the bits (x) used in last byte are: xxxxxx00
+0D 2  Pause After this block in milliseconds (ms)                        [1000]
+0F 3  Length of following data
+12 x  Data; format is as for TAP (MSb first)
+
+- Length: [0F,10,11]+12
+*/
+
+/* 2 pulses per bit, tone is composed of 1 bits */
+#define CPC_PILOT_TONE_NUM_WAVES	(2048)
+#define CPC_PILOT_TONE_NUM_PULSES (CPC_PILOT_TONE_NUM_WAVES*2)
+
+#define CPC_NOPS_PER_FRAME (19968)
+#define CPC_NOPS_PER_SECOND	(CPC_NOPS_PER_FRAME*50)
+#define CPC_T_STATES	(CPC_NOPS_PER_SECOND*4)
+
+#define T_STATE_CONVERSION_FACTOR (TZX_T_STATES<<8)/(CPC_T_STATES>>8)
+/* pause between each block */
+#define CPC_PAUSE_AFTER_BLOCK_IN_MS	2500
+/* pause between tape header and data for block */
+#define CPC_PAUSE_AFTER_HEADER_IN_MS 14
+
+void InitialiseStandardSpeedDataBlock(TZX_BLOCK *pBlock, int Pause)
+{
+	unsigned char *pHeader = TZX_GetBlockHeaderPtr(pBlock);
+
+	if (pHeader!=NULL)
+	{
+		/* check it is a turbo-loading data block */
+		if (pHeader[0] == TZX_STANDARD_SPEED_DATA_BLOCK)
+		{
+			pHeader++;
+
+			pHeader[0x00] = (Pause & 0x0ff);
+			pHeader[0x01] = (Pause>>8);
+
+
+		}
+	}
+}
+
+void	CPC_InitialiseTurboLoadingDataBlock(TZX_BLOCK *pBlock, int BaudRate,int Pause)
+{
+	unsigned char *pHeader = TZX_GetBlockHeaderPtr(pBlock);
+
+	if (pHeader!=NULL)
+	{
+		/* check it is a turbo-loading data block */
+		if (pHeader[0] == TZX_TURBO_LOADING_DATA_BLOCK)
+		{
+			int ZeroPulseLengthInMicroseconds;
+			long64 ZeroPulseLengthInCPCTStates;
+			int OnePulseLength;
+			int ZeroPulseLength;
+
+			pHeader++;
+			/* equation from CPC firmware guide:
+			Average baud rate: = 1 000 000/(3*half zero length) = 333 333/Half zero length
+			*/
+
+			ZeroPulseLengthInMicroseconds = 333333/BaudRate;
+			ZeroPulseLengthInCPCTStates = ZeroPulseLengthInMicroseconds<<2;
+
+			ZeroPulseLength = (ZeroPulseLengthInCPCTStates*
+							(T_STATE_CONVERSION_FACTOR>>8))>>8;
+
+			/* one pulse is twice the size of a zero pulse */
+			OnePulseLength = ZeroPulseLength<<1;
+
+			/* PILOT pulse on CPC is a one bit */
+			pHeader[0x00] = (unsigned char)OnePulseLength;
+			pHeader[0x01] = (unsigned char)(OnePulseLength>>8);
+
+			/* SYNC on CPC is a zero bit, both sync pulses will be the same */
+			pHeader[0x02] = pHeader[0x04] = (unsigned char)ZeroPulseLength;
+			pHeader[0x03] = pHeader[0x05] = (unsigned char)(ZeroPulseLength>>8);
+
+			/* write zero pulse length */
+			pHeader[0x06] = (unsigned char)ZeroPulseLength;
+			pHeader[0x07] = (unsigned char)(ZeroPulseLength>>8);
+
+			/* write one pulse length */
+			pHeader[0x08] = (unsigned char)OnePulseLength;
+			pHeader[0x09] = (unsigned char)(OnePulseLength>>8);
+
+			/* PILOT pulse is same as 1 Pulse */
+			/* pilot tone is 2048 bits long */
+			pHeader[0x0a] = CPC_PILOT_TONE_NUM_PULSES & 0x0ff;
+			pHeader[0x0b] = (CPC_PILOT_TONE_NUM_PULSES>>8);
+
+			/* the end of the block will be the trailer bytes. Say all bits are
+			used, although, because it doesn't contain useful data it doesn't matter */
+			pHeader[0x0c] = 8;
+
+			pHeader[0x0d] = (Pause & 0x0ff);
+			pHeader[0x0e] = (Pause>>8);
+
+
+		}
+	}
+}
+
+
+
+void WriteStandardSpeedDataBlock(TZX_FILE *pFile, unsigned char SyncPattern, unsigned char *pData, int DataSize, int Pause)
+{
+	TZX_BLOCK *pBlock;
+	unsigned char *pBlockData;
+
+	pBlock = TZX_CreateBlock(TZX_STANDARD_SPEED_DATA_BLOCK);
+	InitialiseStandardSpeedDataBlock(pBlock, Pause);
+
+	if (pBlock!=NULL)
+	{
+	    /* one byte for sync, one byte for checksum */
+        int TZX_DataBlockSize = DataSize+2;
+
+		/* add block to end of file */
+		TZX_AddBlockToEndOfFile(pFile,pBlock);
+
+		/* allocate data in block */
+		TZX_AddDataToBlock(pBlock, TZX_DataBlockSize);
+
+		pBlockData= TZX_GetBlockDataPtr(pBlock);
+
+		if (pBlockData!=NULL)
+		{
+		    char CheckSum = SyncPattern;
+            int i;
+
+            /* write pattern */
+			*pBlockData = SyncPattern;
+			++pBlockData;
+
+            for (i=0; i<DataSize; i++)
+            {
+                char ch = *pData;
+                ++pData;
+                CheckSum^=ch;
+                *pBlockData = ch;
+                ++pBlockData;
+            }
+            *pBlockData = CheckSum&0x0ff;
+		}
+	}
+}
+
+
+#define CPC_DATA_CHUNK_SIZE 256
+#define CPC_DATA_BLOCK_SIZE 2048
+
+/* write a block of data to a file */
+void	CPC_WriteTurboLoadingDataBlock(TZX_FILE *pFile, unsigned char SyncPattern, unsigned char *pData, int DataSize, int Pause)
+{
+	TZX_BLOCK *pBlock;
+	unsigned char *pBlockData;
+
+	int NumChunks;
+	int TZX_DataBlockSize;
+
+	/* divide into complete 256 byte blocks */
+	NumChunks = (DataSize+255)>>8;
+
+	/* each tape block is split into 256 chunks, each chunk has a CRC */
+
+	/* size of all chunks, plus CRC's for each block */
+	TZX_DataBlockSize =
+		/* size of all chunks */
+		(NumChunks<<8) +
+		/* size of CRC's for all chunks */
+		(NumChunks<<1) +
+		/* size of trailer in bytes */
+		4 +
+		/* size of sync pattern */
+		1;
+
+
+
+	pBlock = TZX_CreateBlock(TZX_TURBO_LOADING_DATA_BLOCK);
+	CPC_InitialiseTurboLoadingDataBlock(pBlock, BaudRate,Pause);
+
+
+	if (pBlock!=NULL)
+	{
+		/* add block to end of file */
+		TZX_AddBlockToEndOfFile(pFile,pBlock);
+
+		/* allocate data in block */
+		TZX_AddDataToBlock(pBlock, TZX_DataBlockSize);
+
+		pBlockData= TZX_GetBlockDataPtr(pBlock);
+
+		if (pBlockData!=NULL)
+		{
+			int i,j;
+			unsigned char *pDataPtr;
+			int DataSizeRemaining;
+			unsigned char *pBlockPtr;
+			unsigned short CRC;
+
+			pDataPtr = pData;
+			DataSizeRemaining = DataSize;
+			pBlockPtr = pBlockData;
+
+			/* write pattern */
+			pBlockPtr[0] = SyncPattern;
+			pBlockPtr++;
+
+			/* write each chunk in turn and calculate CRC */
+			for (i=0; i<NumChunks; i++)
+			{
+				/* copy data into block */
+				if (DataSizeRemaining<CPC_DATA_CHUNK_SIZE)
+				{
+					/* less than CPC_DATA_CHUNK_SIZE */
+					/* copy data, and fill rest with zeros */
+
+					/* copy less than 256 bytes */
+					memcpy(pBlockPtr, pDataPtr, DataSizeRemaining);
+					/* fill reset of chunk with zero's */
+					memset(pBlockPtr + DataSizeRemaining, 0, CPC_DATA_CHUNK_SIZE-DataSizeRemaining);
+					/* update source pointer */
+					pDataPtr+=DataSizeRemaining;
+					/* update size remaining - nothing */
+					DataSizeRemaining = 0;
+				}
+				else
+				{
+					/* greater or equal to CPC_DATA_CHUNK_SIZE */
+					/* copy CPC_DATA_CHUNK_SIZE max */
+					memcpy(pBlockPtr, pDataPtr, CPC_DATA_CHUNK_SIZE);
+					/* update source pointer */
+					pDataPtr += CPC_DATA_CHUNK_SIZE;
+					/* update size remaining */
+					DataSizeRemaining-=CPC_DATA_CHUNK_SIZE;
+				}
+
+				/* reset CRC */
+				CRC = 0x0ffff;
+
+				/* calculate CRC for block */
+				for (j=0; j<CPC_DATA_CHUNK_SIZE; j++)
+				{
+					char ch;
+
+					ch = pBlockPtr[0];
+					pBlockPtr++;
+					CRC = CRCupdate(CRC, ch);
+				}
+
+				/* store CRC inverted */
+				pBlockPtr[0] = (CRC>>8)^0x0ff;
+				pBlockPtr++;
+				pBlockPtr[0] = CRC^0x0ff;
+				pBlockPtr++;
+			}
+
+
+			/* write trailer */
+			memset(pBlockPtr, 0x0ff, 4);
+		}
+	}
+}
+
+/*
+ID : 14  -  Pure data block
+-------
+        This is the same as in the turbo loading data block, except that it has
+        no pilot or sync pulses.
+
+00 2  Length of ZERO bit pulse
+02 2  Length of ONE bit pulse
+04 1  Used bits in LAST Byte
+05 2  Pause after this block in milliseconds (ms)
+07 3  Length of following data
+0A x  Data
+*/
+
+void	CPC_InitialisePureDataBlock(TZX_BLOCK *pBlock, int BaudRate, int Pause)
+{
+	unsigned char *pHeader = TZX_GetBlockHeaderPtr(pBlock);
+
+	if (pHeader!=NULL)
+	{
+		/* check it is a turbo-loading data block */
+		if (pHeader[0] == TZX_PURE_DATA_BLOCK)
+		{
+			int ZeroPulseLengthInMicroseconds;
+			long64 ZeroPulseLengthInCPCTStates;
+			int OnePulseLength;
+			int ZeroPulseLength;
+
+			pHeader++;
+			/* equation from CPC firmware guide:
+			Average baud rate: = 1 000 000/(3*half zero length) = 333 333/Half zero length
+			*/
+
+			ZeroPulseLengthInMicroseconds = 333333/BaudRate;
+			ZeroPulseLengthInCPCTStates = ZeroPulseLengthInMicroseconds<<2;
+
+			ZeroPulseLength = (ZeroPulseLengthInCPCTStates*
+							(T_STATE_CONVERSION_FACTOR>>8))>>8;
+
+			/* one pulse is twice the size of a zero pulse */
+			OnePulseLength = ZeroPulseLength<<1;
+			/* write zero pulse length */
+			pHeader[0x00] = ZeroPulseLength;
+			pHeader[0x01] = ZeroPulseLength>>8;
+
+			/* write one pulse length */
+			pHeader[0x02] = OnePulseLength;
+			pHeader[0x03] = OnePulseLength>>8;
+
+			/* the end of the block will be the trailer bytes. Say all bits are
+			used, although, because it doesn't contain useful data it doesn't matter */
+			pHeader[0x04] = 8;
+
+			/* write pause */
+			pHeader[0x05] = (Pause & 0x0ff);
+			pHeader[0x06] = (Pause>>8) & 0x0ff;
+
+
+		}
+	}
+}
+
+
+/* the following is for a bitstream */
+unsigned char *pData;
+unsigned long ByteCount;
+unsigned long BitCount;
+
+/* initialise bit stream with buffer to write data to */
+void	BitStream_Initialise(unsigned char *pBuffer)
+{
+	pData = pBuffer;
+	ByteCount = 0;
+	BitCount = 0;
+}
+
+/* write bit to stream */
+void	BitStream_WriteBit(int Bit)
+{
+	unsigned char Data;
+
+	/* get current data written */
+	Data = pData[ByteCount];
+	Data &= ~(1<<(7-BitCount));
+	Data |= (Bit<<(7-BitCount));
+	pData[ByteCount] = Data;
+
+	/* increment bit count */
+	BitCount++;
+	/* if we overrun 8-bits, then bit 3 will be set, add this on */
+	ByteCount += (BitCount>>3);
+	/* mask off bit count */
+	BitCount &= 0x07;
+}
+
+/* write byte to stream */
+void	BitStream_WriteByte(unsigned char Byte)
+{
+	int b;
+	int Bit;
+	unsigned char LocalByte;
+
+	LocalByte = Byte;
+
+	for (b=0; b<8; b++)
+	{
+		Bit = LocalByte & 0x080;
+		Bit = Bit>>7;
+		BitStream_WriteBit(Bit);
+		LocalByte = LocalByte<<1;
+	}
+}
+
+
+
+/* write a block of data to a file */
+void	CPC_WritePureDataBlock(TZX_FILE *pFile, unsigned char SyncPattern, unsigned char *pData, int DataSize, int Pause)
+{
+	TZX_BLOCK *pBlock;
+	unsigned char *pBlockData;
+
+	int NumChunks;
+	int TZX_DataBlockSize;
+
+	/* divide into complete 256 byte blocks */
+	NumChunks = (DataSize+255)>>8;
+
+	/* each tape block is split into 256 chunks, each chunk has a CRC */
+
+	/* size of all chunks, plus CRC's for each block */
+	TZX_DataBlockSize =
+		/* size of all chunks */
+		(NumChunks<<8) +
+		/* size of CRC's for all chunks */
+		(NumChunks<<1) +
+		/* size of trailer in bytes */
+		4 +
+		/* size of sync pattern */
+		1;
+
+	TZX_DataBlockSize+=
+		/* pilot tone - CPC_PILOT_TONE_NUM_WAVES 1 bit's, a zero bit then data as before ... */
+		((CPC_PILOT_TONE_NUM_WAVES + 1)+7)>>3;
+
+	pBlock = TZX_CreateBlock(TZX_PURE_DATA_BLOCK);
+	CPC_InitialisePureDataBlock(pBlock, BaudRate,Pause);
+
+
+	if (pBlock!=NULL)
+	{
+		/* add block to end of file */
+		TZX_AddBlockToEndOfFile(pFile,pBlock);
+
+		/* allocate data in block */
+		TZX_AddDataToBlock(pBlock, TZX_DataBlockSize);
+
+		pBlockData= TZX_GetBlockDataPtr(pBlock);
+
+		if (pBlockData!=NULL)
+		{
+			int i,j;
+			unsigned char *pDataPtr;
+			int DataSizeRemaining;
+			unsigned char *pBlockPtr;
+			unsigned short CRC;
+
+			pDataPtr = pData;
+			DataSizeRemaining = DataSize;
+			pBlockPtr = pBlockData;
+
+			BitStream_Initialise(pBlockPtr);
+
+			/* write leader */
+			for (i=0; i<CPC_PILOT_TONE_NUM_WAVES; i++)
+			{
+				BitStream_WriteBit(1);
+			}
+
+			BitStream_WriteBit(0);
+
+
+			BitStream_WriteByte(SyncPattern);
+
+			/* write each chunk in turn and calculate CRC */
+			for (i=0; i<NumChunks; i++)
+			{
+				int BlockSizeToWrite;
+
+				/* copy data into block */
+				if (DataSizeRemaining<CPC_DATA_CHUNK_SIZE)
+				{
+					BlockSizeToWrite = DataSizeRemaining;
+				}
+				else
+				{
+					BlockSizeToWrite = CPC_DATA_CHUNK_SIZE;
+				}
+
+				CRC = 0x0ffff;
+
+				for (j=0; j<BlockSizeToWrite; j++)
+				{
+					char ch;
+
+					/* get byte */
+					ch = pDataPtr[0];
+					pDataPtr++;
+					/* update CRC */
+					CRC = CRCupdate(CRC, ch);
+					/* write byte to stream */
+					BitStream_WriteByte(ch);
+				}
+
+				if (BlockSizeToWrite!=CPC_DATA_CHUNK_SIZE)
+				{
+					/* write padding zero's */
+					for (j=0; j<(CPC_DATA_CHUNK_SIZE-BlockSizeToWrite); j++)
+					{
+						char ch;
+
+						ch = 0;
+						/* update CRC */
+						CRC = CRCupdate(CRC, ch);
+						/* write byte to stream */
+						BitStream_WriteByte(ch);
+					}
+				}
+
+				DataSizeRemaining-=BlockSizeToWrite;
+
+				CRC = CRC^0x0ffff;
+
+				BitStream_WriteByte((CRC>>8));
+				BitStream_WriteByte(CRC);
+			}
+
+			/* write trailer */
+			for (i=0; i<32; i++)
+			{
+				BitStream_WriteBit(1);
+			}
+		}
+	}
+}
+
+/* write a data block in format specified */
+void	CPC_WriteDataBlock(TZX_FILE *pFile, unsigned char SyncByte, unsigned char *pData, unsigned long DataSize, int Pause)
+{
+	switch (TZXWriteMethod)
+	{
+		case TZX_TURBO_LOADING_DATA_BLOCK:
+		{
+			CPC_WriteTurboLoadingDataBlock(pFile, SyncByte, pData, DataSize,Pause);
+		}
+		break;
+
+		case TZX_PURE_DATA_BLOCK:
+		{
+			/* write header */
+			CPC_WritePureDataBlock(pFile, SyncByte, pData, DataSize,Pause);
+		}
+		break;
+	}
+}
+
+#define UTILITY_NAME "2CDT"
+
+void	DisplayInfo()
+{
+		printf("%s will transfer files into a .CDT/.TZX tape image, in Amstrad CPC/CPC+\r\n", UTILITY_NAME);
+		printf("KC Compact form.\r\n\r\n");
+		printf("Usage: %s [arguments] <input filename> <.cdt image>\r\n\r\n", UTILITY_NAME);
+		printf("-n              - Blank CDT file before use\n");
+        printf("-b <number>	    - Specify Baud rate (default 2000)\n");
+		printf("-s <0 or 1>     - Specify 'Speed Write'.\n");
+		printf("                  0 = 1000 baud, 1 = 2000 baud (default)\n");
+		printf("-t <method>     - TZX Block Write Method.\n");
+		printf("                  0 = Pure Data, 1 = Turbo Loading (default)\n");
+		printf("-m <method>     - Data method\n");
+        printf("                  0 = blocks (default)\n");
+        printf("                  1 = headerless (Firmware function: CAS READ - &BCA1) \n");
+        printf("                  2 = spectrum \n");

+        printf("                  3 = Two blocks. First block of 2K, second block has remainder\n");
+        printf("                  4 = Two blocks. First block of 1 byte, second block has remainder\n");

+		printf("-X <number> 	= Define or override execution address (default is &1000 if no header)\r\n");
+		printf("-L <number> 	= Define or override load address (default is &1000 if no header)\r\n");
+ 		printf("-F <number> 	= Define or override file type (0=BASIC, 2=Binary (default if no header)) etc. Applies to Data method 0\r\n");
+ 		printf("-p <number> 	= Set initial pause in milliseconds (default 3000ms)\r\n");
+ 		printf("-P 				= Add a 1ms pause for buggy emulators that ignore first block\r\n");
+		printf("-r <tape filename>\n");
+        printf("                - Add <input filename> as <tape filename> to CDT (rename file)\n");

+}
+
+extern char *optarg;
+

+int ReadNumberParameter(char *param)

+{

+    int Length = strlen(param);

+    BOOL bIsHex = FALSE;

+    int Offset = 0;

+    unsigned long Value = 0;

+    char ch;

+

+    if (Length==0)

+        return 0;

+

+    /* check for common prefixs for hex numbers */

+    if ((Length>1) && ((param[0]=='&') || (param[0]=='$')))

+    {

+        Offset = 1;

+        bIsHex = TRUE;

+    }

+    else if ((Length>2) && (param[0]=='0') && ((param[1]=='x') || (param[1]=='X')))

+    {

+        Offset = 2;

+        bIsHex = TRUE;

+    }

+

+    if (!bIsHex)

+    {

+        return atoi(param);

+    }

+

+    ch = param[Offset];

+    while (ch!='\0')

+    {

+        Value = Value<<4;

+        if ((ch>='0') && (ch<='9'))

+        {

+            Value = Value | (ch-'0');

+        }

+        else if ((ch>='a') && (ch<='f'))

+        {

+            Value = Value | ((ch-'a')+10);

+        }

+        else if ((ch>='A') && (ch<='F'))

+        {

+            Value = Value | ((ch-'A')+10);

+        }

+        Offset++;

+        ch = param[Offset];

+    }

+

+    return Value;

+}

+
+int		main(int argc, char *argv[])
+{
+    unsigned char *pTapeFilename = NULL;
+
+	if (argc==1)
+	{
+		DisplayInfo();
+	}
+	else
+	{
+		TZX_FILE *pTZXFile;
+		unsigned char *pSourceFilename;
+		unsigned char *pDestFilename;
+		unsigned char *pData;
+		unsigned long DataLength;
+        char c;
+
+		/* initialise defaults */
+		BaudRate = 2000;
+		Pause = 3000;
+		Type = 2;
+		TypeOverride = FALSE;
+		LoadAddressOverride = FALSE;
+		TZXWriteMethod = TZX_TURBO_LOADING_DATA_BLOCK;
+        BlankBeforeUse = FALSE;
+        ExecutionAddress = LoadAddress = 0x01000;
+		ExecutionAddressOverride = FALSE;
+		LoadAddressOverride = FALSE;
+

+		printf("-n              - Blank CDT file before use\n");

+        printf("-b <number>	    - Specify Baud rate (default 2000)\n");

+		printf("-s <0 or 1>     - Specify 'Speed Write'.\n");

+		printf("                  0 = 1000 baud, 1 = 2000 baud (default)\n");

+		printf("-t <method>     - TZX Block Write Method.\n");

+		printf("                  0 = Pure Data, 1 = Turbo Loading (default)\n");

+		printf("-m <method>     - Data method\n");

+        printf("                  0 = blocks (default)\n");

+        printf("                  1 = headerless (Firmware function: CAS READ - &BCA1) \n");

+        printf("                  2 = spectrum \n");

+        printf("                  3 = Two blocks. First block of 2K, second block has remainder\n");

+        printf("                  4 = Two blocks. First block of 1 byte, second block has remainder\n");

+		printf("-X <number> 	= Define or override execution address (default is &1000 if no header)\r\n");

+		printf("-L <number> 	= Define or override load address (default is &1000 if no header)\r\n");

+ 		printf("-F <number> 	= Define or override file type (0=BASIC, 2=Binary (default if no header)) etc. Applies to Data method 0\r\n");

+ 		printf("-p <number> 	= Set initial pause in milliseconds (default 3000ms)\r\n");

+ 		printf("-P 				= Add a 1ms pause for buggy emulators that ignore first block\r\n");

+		printf("-r <tape filename>\n");

+        printf("                - Add <input filename> as <tape filename> to CDT (rename file)\n");

+

+
+        do
+        {
+            c = getopt(argc, argv,"r:nb:p:m:t:F:L:s:X:p:P");
+
+            switch (c)
+            {
+                case 'm':
+                {
+                    int nMethod = atoi(optarg);
+                    CPCMethod = nMethod;
+
+                }
+                break;
+
+                case 'p':
+                {
+	                Pause = atoi(optarg);

+	                if (Pause<0)

+	                {

+	                    Pause = 0;

+	                }
+               }
+               break;
+
+                case 'r':
+                {
+                    pTapeFilename = optarg;
+                }
+                break;
+
+                case 'n':
+                {
+                    BlankBeforeUse = TRUE;
+                }
+                break;
+
+                case 'b':
+                {
+                    int Baud = atoi(optarg);
+                    if ((Baud>0) && (Baud<6000))
+                        BaudRate = Baud;
+                }
+                break;
+
+                case 'X':
+                {
+	                ExecutionAddress = ReadNumberParameter(optarg) & 0x0ffff;
+	                ExecutionAddressOverride = TRUE;
+                }
+                break;

+
+                case 'L':

+                {

+	                LoadAddress = ReadNumberParameter(optarg) & 0x0ffff;

+	                LoadAddressOverride = TRUE;

+                }

+                break;

+
+                case 's':
+                {
+                    int SpeedWrite = atoi(optarg);
+                    if (SpeedWrite==1)
+                    {
+                        BaudRate = 2000;
+                    }
+                    else
+                    {
+                        BaudRate = 1000;
+                    }
+                }
+                break;
+
+                case 'F':
+                {
+	                Type = atoi(optarg) & 0x0ff;
+	                TypeOverride = TRUE;
+
+
+                }
+                break;
+
+

+                case 'P':
+                {
+	                BuggyEmuExtraPause = TRUE;
+
+                }
+                break;
+
+                case 't':
+                {
+                    int nMethod = atoi(optarg);
+                    if (nMethod==0)
+                    {
+                        TZXWriteMethod = TZX_PURE_DATA_BLOCK;
+                    }
+                    else if (nMethod==1)
+                    {
+                        TZXWriteMethod = TZX_TURBO_LOADING_DATA_BLOCK;
+                    }
+                    else if (nMethod==2)
+                    {
+                        TZXWriteMethod = TZX_STANDARD_SPEED_DATA_BLOCK;
+                    }
+                }
+                break;
+
+                default:
+                {
+                }
+                break;
+            }
+
+        }
+        while (c!=-1);
+
+        if ((argc-optind)==0)
+        {
+            printf("No source file or destination file have been specified!\n");
+            exit(1);
+        }
+
+        if ((argc-optind)==1)
+        {
+            printf("No destination file has been specified\n");
+            exit(1);
+        }
+
+        pSourceFilename = argv[optind];
+        pDestFilename = argv[optind+1];
+
+		/* create TZX file */
+		pTZXFile = TZX_CreateFile(TZX_VERSION_MAJOR,TZX_VERSION_MINOR);
+
+		if (pTZXFile!=NULL)
+		{
+			int nFile;
+
+
+			if (BlankBeforeUse)
+			{
+				TZX_BLOCK *pBlock;
+
+				/* if buggy emu, add an extra small pause */
+				if (BuggyEmuExtraPause)
+                {
+					pBlock = TZX_CreateBlock(TZX_PAUSE_BLOCK);
+
+					if (pBlock!=NULL)
+					{
+						/* add a 1ms initial pause for buggy emus */
+						TZX_SetupPauseBlock(pBlock, 1);
+						TZX_AddBlockToEndOfFile(pTZXFile,pBlock);
+					}
+				}
+
+
+				/* correct pause */
+				pBlock = TZX_CreateBlock(TZX_PAUSE_BLOCK);
+
+				if (pBlock!=NULL)
+				{
+					TZX_SetupPauseBlock(pBlock, Pause);
+					TZX_AddBlockToEndOfFile(pTZXFile,pBlock);
+				}
+			}
+
+
+            if (Host_LoadFile(pSourceFilename, &pData, &DataLength))
+            {
+                int FileOffset;
+                int FileLengthRemaining;
+                int TapeBlockSize;
+                BOOL FirstBlock,LastBlock;
+                int BlockIndex;
+                unsigned short BlockLocation;
+
+                /* header for tape file */
+                unsigned char TapeHeader[CPC_TAPE_HEADER_SIZE];
+
+                /* calculate checksum from loaded file */
+                unsigned short CalculatedChecksum = (unsigned short)AMSDOS_CalculateChecksum(pData);
+
+                /* get stored checksum */
+                unsigned short StoredChecksum =
+                                    (pData[67] & 0x0ff) |
+                                     (pData[68] & 0x0ff)<<8;
+
+                FileOffset = 0;
+                FileLengthRemaining = DataLength;
+                BlockIndex = 1;
+                FirstBlock =TRUE;
+
+                /* insert a pause block - 1 second, this is added onto the end of the previous block */
+    /*            if (BlankBeforeUse == FALSE)
+                {
+                    TZX_BLOCK *pBlock;
+
+                    pBlock = TZX_CreateBlock(TZX_PAUSE_BLOCK);
+
+                    if (pBlock!=NULL)
+                    {
+                        TZX_SetupPauseBlock(pBlock, 2000);
+                        TZX_AddBlockToEndOfFile(pTZXFile,pBlock);
+                    }
+                }
+*/
+
+
+                /* clear tape header */
+                memset(TapeHeader, 0, CPC_TAPE_HEADER_SIZE);
+
+                /* checksum's match? */
+                if (CalculatedChecksum==StoredChecksum)
+                {

+                    /* copy file type */
+                    TapeHeader[CPC_TAPE_HEADER_FILE_TYPE] = pData[CPC_TAPE_HEADER_FILE_TYPE];
+                    /* copy execution address */
+                    TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_LOW] = pData[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_LOW];
+                    TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_HIGH] = pData[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_HIGH];
+                    /* copy data location */
+                    TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_LOW] = pData[CPC_TAPE_HEADER_DATA_LOCATION_LOW];
+                    TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_HIGH] = pData[CPC_TAPE_HEADER_DATA_LOCATION_HIGH];
+
+                    FileOffset+=128;
+                    FileLengthRemaining-=128;
+
+                    /* override execution address? */
+                    if (ExecutionAddressOverride)
+                    {
+						TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_LOW] = ExecutionAddress&0xFF;
+						TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_HIGH] = (ExecutionAddress>>8)&0xFF;
+                    }
+
+                    /* override type? */
+                    if (TypeOverride)
+                    {
+						TapeHeader[CPC_TAPE_HEADER_FILE_TYPE] = Type;
+                    }
+
+                    /* override load address? */
+                    if (LoadAddressOverride)
+                    {
+						TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_LOW] = LoadAddress&0xFF;
+						TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_HIGH] = (LoadAddress>>8)&0xFF;
+					}
+
+                }
+                else
+                {
+					/* set type */
+					TapeHeader[CPC_TAPE_HEADER_FILE_TYPE] = Type;
+
+					/* set execution address */
+					TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_LOW] = ExecutionAddress&0xFF;
+					TapeHeader[CPC_TAPE_HEADER_DATA_EXECUTION_ADDRESS_HIGH] = (ExecutionAddress>>8)&0xFF;
+
+					/* set load address */
+					TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_LOW] = LoadAddress&0xFF;
+					TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_HIGH] = (LoadAddress>>8)&0xFF;
+                }
+
+                if (pTapeFilename!=NULL)
+                {
+                    int i;
+                    int nLength = strlen(pTapeFilename);
+                    if (nLength>16)
+                        nLength = 16;
+                    for (i=0; i<nLength; i++)
+                    {
+                        TapeHeader[i] = toupper(pTapeFilename[i]);
+                    }
+                }
+                TapeHeader[CPC_TAPE_HEADER_DATA_LOGICAL_LENGTH_LOW] = (FileLengthRemaining & 0x0ff);
+                TapeHeader[CPC_TAPE_HEADER_DATA_LOGICAL_LENGTH_HIGH] = (FileLengthRemaining>>8) & 0x0ff;
+
+
+                BlockLocation = TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_LOW] |
+                                (TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_HIGH]<<8);
+
+                if (CPCMethod == CPC_METHOD_SPECTRUM)
+                {
+                    /* write data into block */
+                    WriteStandardSpeedDataBlock(pTZXFile, 0x0ff, &pData[FileOffset], FileLengthRemaining, 1000);
+                }
+                else
+                {
+                    do
+                    {
+                        unsigned char Flag;
+    /*
+                        CPC can't handle this one
+                        if (CPCMethod == CPC_METHOD_2BLOCKS)
+                        {
+                              if (FirstBlock)
+                              {
+                                    TapeBlockSize=CPC_DATA_BLOCK_SIZE;
+                                    LastBlock = FALSE;
+                              }
+                              else
+                              {
+                                    TapeBlockSize = FileLengthRemaining;
+                                    LastBlock = TRUE;
+                              }
+                        }
+                        else
+    */
+                        if (CPCMethod == CPC_METHOD_BLOCKS)
+                        {
+                            /* calc size of tape data block */
+                            if (FileLengthRemaining>CPC_DATA_BLOCK_SIZE)
+                            {
+                                TapeBlockSize = CPC_DATA_BLOCK_SIZE;
+                                LastBlock = FALSE;
+                            }
+                            else
+                            {
+                                TapeBlockSize = FileLengthRemaining;
+                                LastBlock = TRUE;
+                            }
+                        }
+                        else
+                        if (CPCMethod == CPC_METHOD_HEADERLESS)
+                        {
+                            TapeBlockSize = FileLengthRemaining;
+                        }
+
+
+
+                        /**** HEADER ****/
+                        /* SETUP TAPE RELATED DATA */
+                        /* block index */
+                        TapeHeader[CPC_TAPE_HEADER_BLOCK_NUMBER] = BlockIndex;
+
+                        /* first block? */
+                        if (FirstBlock)
+                        {
+                            FirstBlock = FALSE;
+
+                            Flag = 0x0ff;
+                        }
+                        else
+                        {
+                            Flag = 0;
+                        }
+
+                        TapeHeader[CPC_TAPE_HEADER_FIRST_BLOCK_FLAG] = Flag;
+
+                        /* last block? */
+                        if (LastBlock)
+                        {
+                            Flag = 0x0ff;
+                        }
+                        else
+                        {
+                            Flag = 0;
+                        }
+
+                        TapeHeader[CPC_TAPE_HEADER_LAST_BLOCK_FLAG] = Flag;
+
+                        /* size of data following */
+                        TapeHeader[CPC_TAPE_HEADER_DATA_LENGTH_LOW] = (unsigned char)TapeBlockSize;
+                        TapeHeader[CPC_TAPE_HEADER_DATA_LENGTH_HIGH] = (unsigned char)(TapeBlockSize>>8);
+
+                        /* location of block */
+                        TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_LOW] = (unsigned char)BlockLocation;
+                        TapeHeader[CPC_TAPE_HEADER_DATA_LOCATION_HIGH] = (unsigned char)(BlockLocation>>8);
+
+                        /* don't write a header if headerless */
+                        if (CPCMethod!=CPC_METHOD_HEADERLESS)
+                        {
+                            /* write header */
+                            CPC_WriteDataBlock(pTZXFile, 0x02c, TapeHeader, CPC_TAPE_HEADER_SIZE,10);
+                        }
+
+                        /* write data into block */
+                        CPC_WriteDataBlock(pTZXFile, 0x016, &pData[FileOffset], TapeBlockSize,CPC_PAUSE_AFTER_BLOCK_IN_MS);
+
+                        BlockLocation+=TapeBlockSize;
+                        BlockIndex++;
+                        FileOffset+=TapeBlockSize;
+                        FileLengthRemaining -= TapeBlockSize;
+                    }
+                    while (FileLengthRemaining!=0);
+                }
+
+                free(pData);
+            }
+
+			/* write file */
+			if (BlankBeforeUse)
+			{
+                TZX_WriteFile(pTZXFile, pDestFilename);
+			}
+			else
+			{
+			    TZX_AppendFile(pTZXFile, pDestFilename);
+			}
+
+			/* free it */
+			TZX_FreeFile(pTZXFile);
+		}
+		else
+		{
+			printf("Failed to open output file!\r\n");
+			exit(1);
+		}
+
+	}
+
+	exit(0);
+
+	return 0;
+}
diff --git a/tools/2CDT/src/defs.h b/tools/2CDT/src/defs.h
new file mode 100644
index 0000000..f042dde
--- /dev/null
+++ b/tools/2CDT/src/defs.h
@@ -0,0 +1,36 @@
+/* 
+ *  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.
+ */
+#ifndef __DEFS_HEADER_INCLUDED__
+#define __DEFS_HEADER_INCLUDED__
+
+
+typedef int BOOL;
+
+#ifndef TRUE
+#define TRUE (1==1)
+#endif
+
+#ifndef FALSE
+#define FALSE (1==0)
+#endif
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+#endif
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;

+}

diff --git a/tools/2CDT/src/tzxfile.h b/tools/2CDT/src/tzxfile.h
new file mode 100644
index 0000000..397f5d1
--- /dev/null
+++ b/tools/2CDT/src/tzxfile.h
@@ -0,0 +1,79 @@
+/* 

+ *  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.

+ */

+

+#ifndef __TZX_FILE_HEADER__

+#define __TZX_FILE_HEADER__

+

+#include "defs.h"

+

+#define TZX_VERSION_MAJOR	1

+#define TZX_VERSION_MINOR	10

+

+#define TZX_STANDARD_SPEED_DATA_BLOCK	0x010

+#define TZX_TURBO_LOADING_DATA_BLOCK	0x011

+#define TZX_PAUSE_BLOCK					0x020

+#define TZX_PURE_DATA_BLOCK				0x014

+#define TZX_DIRECT_RECORDING_BLOCK		0x015

+

+#define TZX_T_STATES 3500000

+

+

+#define TZX_HARDWARE_COMPUTER_CPC464	    0x015 /* Amstrad CPC 464 */

+#define TZX_HARDWARE_COMPUTER_CPC664		0x016 /* Amstrad CPC 664 */

+#define TZX_HARDWARE_COMPUTER_CPC6128		0x017 /* Amstrad CPC 6128 */

+#define TZX_HARDWARE_COMPUTER_CPC464PLUS	0x018 /* Amstrad CPC 464+ */

+#define TZX_HARDWARE_COMPUTER_CPC6128PLUS	0x019 /* Amstrad CPC 6128+ */

+

+typedef struct TZX_BLOCK

+{

+	/* previous TZX block */

+	struct TZX_BLOCK *pPrev;

+	/* next TZX block */

+	struct TZX_BLOCK *pNext;

+	/* pointer to header data allocated for this block */

+	unsigned char *pBlockHeader;

+	/* size of data block */

+	unsigned long DataBlockSize;

+	/* pointer to data added to this block */

+	unsigned char *pBlockData;

+} TZX_BLOCK;

+

+typedef struct TZX_FILE

+{

+	/* version of TZX file */

+	unsigned char VersionMajor;

+	unsigned char VersionMinor;

+	/* pointer to first block */

+	TZX_BLOCK *pFirstBlock;

+} TZX_FILE;

+

+void	TZX_WriteFile(TZX_FILE *pTZXFile, unsigned char *pFilename);

+unsigned char *TZX_GetBlockDataPtr(TZX_BLOCK *);

+unsigned char *TZX_GetBlockHeaderPtr(TZX_BLOCK *);

+

+TZX_FILE *TZX_CreateFile(unsigned char VersionMajor, unsigned char VersionMinor);

+void	TZX_FreeFile(TZX_FILE *pFile);

+void	TZX_AddDataToBlock(TZX_BLOCK *pBlock, int DataSize);

+unsigned char *TZX_GetDataBlockPtr(TZX_BLOCK *pBlock);

+void	TZX_AddBlockToEndOfFile(TZX_FILE *pFile, TZX_BLOCK *pBlock);

+int	TZX_GetBlockHeaderSize(unsigned char ID);

+BOOL TZX_BlockHasData(unsigned char ID);

+TZX_BLOCK *TZX_CreateBlock(unsigned char ID);

+void	TZX_SetupPauseBlock(TZX_BLOCK *pBlock,unsigned long PauseInMilliseconds);

+#endif

+