diff options
Diffstat (limited to 'src/cpcout.c')
| -rw-r--r-- | src/cpcout.c | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/src/cpcout.c b/src/cpcout.c index 27d5d82..e3e871d 100644 --- a/src/cpcout.c +++ b/src/cpcout.c @@ -19,7 +19,7 @@ ------------------------------------------------------------------------- - Commodore CPC tape output handler. + Amstrad CPC tape output handler. */ #include <stdlib.h> @@ -57,50 +57,41 @@ static Options options = {-1}; /* ---------------------------------------- PRIVATE FUNCTIONS */ -static void WriteByte(FILE *fp, Byte b) +static Byte WriteByte(FILE *fp, Byte b, Byte chk) { + chk ^= b; putc(b, fp); + return chk; } -static void WriteWord(FILE *fp, int w) +static Byte WriteWord(FILE *fp, int w, Byte chk) { - WriteByte(fp, w & 0xff); - WriteByte(fp, (w & 0xff00) >> 8); + chk = WriteByte(fp, w & 0xff, chk); + chk = WriteByte(fp, (w & 0xff00) >> 8, chk); + return chk; } -static void Write3(FILE *fp, unsigned long l) +static Byte Write3Word(FILE *fp, int w, Byte chk) { - int f; - - for(f = 0; f < 3; f++) - { - WriteByte(fp, l & 0xff); - l >>= 8u; - } -} - - -static void WriteLong(FILE *fp, unsigned long l) -{ - int f; - - for(f = 0; f < 4; f++) - { - WriteByte(fp, l & 0xff); - l >>= 8u; - } + chk = WriteByte(fp, w & 0xff, chk); + chk = WriteByte(fp, (w & 0xff00) >> 8, chk); + chk = WriteByte(fp, (w & 0xff0000) >> 16, chk); + return chk; } -static void WriteString(FILE *fp, const char *p, int len, - Byte fill, Codepage cp) +static Byte WriteString(FILE *fp, const char *p, int len, + Byte fill, Codepage cp, Byte chk) { while(len--) { - WriteByte(fp, *p ? CodeFromNative(cp, *p++) : CodeFromNative(cp, fill)); + chk = WriteByte(fp, *p ? CodeFromNative(cp, *p++) : + CodeFromNative(cp, fill), chk); } + + return chk; } @@ -152,10 +143,10 @@ int CPCOutput(const char *filename, const char *filename_bank, /* Output the binary files */ - WriteString(fp, "ZXTape!", 7, 0, CP_ASCII); - WriteByte(fp, 0x1a); - WriteByte(fp, 1); - WriteByte(fp, 13); + WriteString(fp, "ZXTape!", 7, 0, CP_ASCII, 0); + WriteByte(fp, 0x1a, 0); + WriteByte(fp, 1, 0); + WriteByte(fp, 13, 0); for(f = 0; f < count; f++) { @@ -177,36 +168,39 @@ int CPCOutput(const char *filename, const char *filename_bank, for(block = 0; block <= blocks; block++) { + Byte chk; int first, last; first = 0; last = 0; - WriteByte(fp, 0x11); /* Block type */ + WriteByte(fp, 0x11, 0); /* Block type */ + + WriteWord(fp, 0x626, 0); /* PILOT */ + WriteWord(fp, 0x34f, 0); /* SYNC1 */ + WriteWord(fp, 0x302, 0); /* SYNC2 */ + WriteWord(fp, 0x33a, 0); /* ZERO */ + WriteWord(fp, 0x673, 0); /* ONE */ + WriteWord(fp, 0xffe, 0); /* PILOT LEN */ + WriteByte(fp, 8, 0); /* USED BITS */ + WriteWord(fp, 0x10, 0); /* PAUSE */ + Write3Word(fp, 0x0041, 0); /* LEN */ - WriteWord(fp, 0x09cc); /* PILOT */ - WriteWord(fp, 0x0585); /* SYNC1 */ - WriteWord(fp, 0x04aa); /* SYNC2 */ - WriteWord(fp, 0x0505); /* ZERO */ - WriteWord(fp, 0x0a09); /* ONE */ - WriteWord(fp, 0x1000); /* PILOT LEN */ - WriteByte(fp, 0x08); /* NUM BITS IN LAST BYTE */ - WriteWord(fp, 0x07d0); /* PAUSE */ - Write3(fp, 0x0040); /* LEN */ + chk = 0; if (f == 0) { - WriteString(fp, filename, 16, 0, CP_ASCII); + chk = WriteString(fp, filename, 16, 0, CP_ASCII, chk); } else { char fn[16]; snprintf(fn, sizeof fn, filename_bank, bank[f]->number); - WriteString(fp, fn, 16, 0, CP_ASCII); + chk = WriteString(fp, fn, 16, 0, CP_ASCII, chk); } - WriteByte(fp, block+1); + chk = WriteByte(fp, block+1, chk); if (block == 0) { @@ -228,36 +222,42 @@ int CPCOutput(const char *filename, const char *filename_bank, blocklen = len % BLOCK_SIZE; } - WriteByte(fp, last); - WriteByte(fp, 2); - WriteWord(fp, blocklen); - WriteWord(fp, addr); - WriteByte(fp, first); - WriteWord(fp, len); - WriteWord(fp, options.start_addr); - WriteString(fp, "", 64 - 28, 0, CP_ASCII); + chk = WriteByte(fp, last, chk); + chk = WriteByte(fp, 2, chk); + chk = WriteWord(fp, blocklen, chk); + chk = WriteWord(fp, addr, chk); + chk = WriteByte(fp, first, chk); + chk = WriteWord(fp, len, chk); + chk = WriteWord(fp, options.start_addr, chk); + chk = WriteString(fp, "", 64 - 28, 0, CP_ASCII, chk); + + WriteByte(fp, chk, 0); addr += blocklen; /* Output file data */ - WriteByte(fp, 0x11); /* Block type */ - - WriteWord(fp, 0x09cc); /* PILOT */ - WriteWord(fp, 0x0585); /* SYNC1 */ - WriteWord(fp, 0x04aa); /* SYNC2 */ - WriteWord(fp, 0x0505); /* ZERO */ - WriteWord(fp, 0x0a09); /* ONE */ - WriteWord(fp, 0x1000); /* PILOT LEN */ - WriteByte(fp, 0x08); /* NUM BITS IN LAST BYTE */ - WriteWord(fp, 0x07d0); /* PAUSE */ - Write3(fp, blocklen); /* LEN */ + WriteByte(fp, 0x11, 0); /* Block type */ + + WriteWord(fp, 0x626, 0); /* PILOT */ + WriteWord(fp, 0x34f, 0); /* SYNC1 */ + WriteWord(fp, 0x302, 0); /* SYNC2 */ + WriteWord(fp, 0x33a, 0); /* ZERO */ + WriteWord(fp, 0x673, 0); /* ONE */ + WriteWord(fp, 0xffe, 0); /* PILOT LEN */ + WriteByte(fp, 8, 0); /* USED BITS */ + WriteWord(fp, 0x10, 0); /* PAUSE */ + Write3Word(fp, blocklen + 1, 0); /* LEN */ + + chk = 0; while(min < addr) { - WriteByte(fp, mem[min]); + chk = WriteByte(fp, mem[min], chk); min++; } + + WriteByte(fp, chk, 0); } } |