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casdir.c
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casdir.c
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/**************************************************************************/
/* */
/* file: casdir.c */
/* version: 1.31 (April 11, 2016) */
/* */
/* description: This tool displays the contents of a .cas file. The .cas */
/* format is the standard format for MSX to emulate tape */
/* recorders and can be used with most emulators. */
/* */
/* */
/* 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, or (at your option) */
/* any later version. See COPYING for more details. */
/* */
/* */
/* Copyright 2001-2016 Vincent van Dam (vincentd@erg.verweg.com) */
/* */
/**************************************************************************/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <memory.h>
char HEADER[8] = { 0x1F,0xA6,0xDE,0xBA,0xCC,0x13,0x7D,0x74 };
char ASCII[10] = { 0xEA,0xEA,0xEA,0xEA,0xEA,0xEA,0xEA,0xEA,0xEA,0xEA };
char BIN[10] = { 0xD0,0xD0,0xD0,0xD0,0xD0,0xD0,0xD0,0xD0,0xD0,0xD0 };
char BASIC[10] = { 0xD3,0xD3,0xD3,0xD3,0xD3,0xD3,0xD3,0xD3,0xD3,0xD3 };
enum next {
NEXT_NONE,
NEXT_ASCII,
NEXT_BINARY,
NEXT_DATA
};
int main(int argc, char* argv[])
{
FILE *ifile;
union {
uint8_t data[10];
struct binary_header_t {
uint16_t start, stop, exec;
} binary_header;
} buffer;
char filename[6];
long position;
int next = NEXT_NONE;
if (argc != 2) {
printf("usage: %s <ifile>\n",argv[0]);
exit(0);
}
if ( (ifile = fopen(argv[1],"rb")) == NULL) {
fprintf(stderr,"%s: failed opening %s\n",argv[0],argv[1]);
exit(1);
}
position=0;
while (fread(&buffer,1,8,ifile)==8) {
position += 8;
if (!memcmp(&buffer,HEADER,8)) {
switch (next) {
case NEXT_NONE:
default:
if (fread(&buffer,1,10,ifile)==10) {
if (!memcmp(&buffer,ASCII,10)) {
fread(filename,1,6,ifile); next=NEXT_ASCII;
printf("%.6s ascii\n",filename);
position += 16;
}
else if (!memcmp(&buffer,BIN,10)) {
fread(filename,1,6,ifile); next=NEXT_BINARY;
position += 16;
}
else if (!memcmp(&buffer,BASIC,10)) {
fread(filename,1,6,ifile); next=NEXT_DATA;
printf("%.6s basic\n", filename);
position += 16;
}
else {
printf("------ custom %.6x\n",(int)position);
fseek(ifile, -2, SEEK_CUR);
position += 8;
}
}
break;
case NEXT_ASCII:
while (fread(&buffer,1,8,ifile) == 8 &&
memchr(&buffer, 0x1a, 8) == NULL)
position += 8;
position += 8;
next = NEXT_NONE;
break;
case NEXT_BINARY:
if (fread(&buffer,1,8,ifile)==8) {
if (!buffer.binary_header.exec)
buffer.binary_header.exec=buffer.binary_header.start;
printf("%.6s binary %.4x,%.4x,%.4x\n",filename,
buffer.binary_header.start,
buffer.binary_header.stop,
buffer.binary_header.exec);
position += 8;
next=NEXT_NONE;
}
break;
case NEXT_DATA:
next=NEXT_NONE;
break;
}
}
}
fclose(ifile);
return 0;
}