Coming in Jan...

[Wrathchild]

Here's a little C program I made today:

 

#include <stdio.h>

#include <string.h>



#define ATR_HDR_LEN 16

#define SECTOR_LEN 128L



#define atrsector(fp,x) fseek(fp,SECTOR_LEN*((x)-1)+ATR_HDR_LEN,SEEK_SET)



struct entry {

char type;

unsigned char len_lo;

unsigned char len_hi;

unsigned char sec_lo;

unsigned char sec_hi;

char fname[8];

char f_ext[3];

};



typedef struct entry ENTRY;



unsigned char directory[SECTOR_LEN*4];

unsigned char secbuf[SECTOR_LEN];



int main(int argc, char *argv[])

{

FILE *fp = fopen("Eidolon.atr","rb");

FILE *fo;

char *dp;

ENTRY *ep;

int togo, sector,l;

char f_out[12], *p;

atrsector(fp,0x16A);

fread(directory, SECTOR_LEN, 4, fp);

dp = directory;

while (1)

{

 ep = (ENTRY*)dp;

 if (ep->type != 'B') break;

 togo = (ep->len_hi&3) * 256 + ep->len_lo;

 sector = ep->sec_hi * 256 + ep->sec_lo;

 memcpy(f_out, ep->fname, 8);

 f_out[8] = '';

 p = strchr(f_out,' ');

 if (p) *p = '';

 strcat(f_out,".");

 strncat(f_out, ep->f_ext, 3);

 printf("Filename: %sn", f_out);

 fo = fopen(f_out, "wb");

 do {

 	printf("Sector: %03X", sector);

 	atrsector(fp, sector);

 	fread(secbuf, SECTOR_LEN, 1, fp);

 	l = secbuf[SECTOR_LEN-1];

 	printf(" Length: %dn", l);

 	fwrite(secbuf, 1, l, fo);

 	sector = secbuf[SECTOR_LEN-3] & 3;

 	sector *= 256;

 	sector += secbuf[SECTOR_LEN-2];

 } while (--togo > 0);

 fclose(fo);

 dp += 16;

}

fclose(fp);

}

 

This dumps out the sub files from 'The Eidolon' atr disk image I have.

 

Now to arrange them on a cart and replace the file load routines (e.g. $A051). :wink:

 

Regards,

 

Mark

[Wrathchild]

Odd this... using gcc under cygwin this program works

but using VC++ (v6) it endlessly reloops though files.

Can anyone see why?