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mkdos33fs: we were starting catalog at 11/1 instead of 11/f

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this confuses some of the tools
This commit is contained in:
Vince Weaver 2016-12-06 23:38:13 -05:00
parent a83c485a88
commit a868c4957b
1 changed files with 61 additions and 64 deletions
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125
dos33fs-utils/mkdos33fs.c
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@ -148,72 +148,69 @@ int main(int argc, char **argv) {
/* clear buffer */
for(i=0;i<block_size;i++) buffer[i]=0;
/* Create VTOC */
buffer[VTOC_DOS_RELEASE]=0x3; /* fake dos 3.3 */
buffer[VTOC_CATALOG_T]=17;
buffer[VTOC_CATALOG_S]=1; /* 1st Catalog typically at 0x11/0x1 */
buffer[VTOC_DISK_VOLUME]=254; /* typical volume 254 */
buffer[VTOC_MAX_TS_PAIRS]=((block_size-0xc)/2)&0xff;
/* Number of T/S pairs fitting */
/* in a T/S list sector */
/* Note, overflows if block_size>524 */
buffer[VTOC_LAST_ALLOC_T]=18; /* last track space was allocated */
/* Start at middle, work way out */
buffer[VTOC_ALLOC_DIRECT]=1; /* Working our way outward */
buffer[VTOC_NUM_TRACKS]=num_tracks;
buffer[VTOC_S_PER_TRACK]=num_sectors;
buffer[VTOC_BYTES_PER_SL]=block_size&0xff;
buffer[VTOC_BYTES_PER_SH]=(block_size>>8)&0xff;
/* Set sector bitmap so whole disk is free */
for(i=VTOC_FREE_BITMAPS;i<block_size;i+=4) {
buffer[i]=0xff;
buffer[i+1]=0xff;
if (num_sectors>16) {
buffer[i+2]=0xff;
buffer[i+3]=0xff;
}
}
/* reserve track 0 */
/* No user data can be stored here as track=0 is special case */
/* end of file indicator */
buffer[VTOC_FREE_BITMAPS]=0x00;
buffer[VTOC_FREE_BITMAPS+1]=0x00;
buffer[VTOC_FREE_BITMAPS+2]=0x00;
buffer[VTOC_FREE_BITMAPS+3]=0x00;
/* Create VTOC */
buffer[VTOC_DOS_RELEASE]=0x3; /* fake dos 3.3 */
buffer[VTOC_CATALOG_T]=0x11;
buffer[VTOC_CATALOG_S]=0xf; /* 1st Catalog typically at 0x11/0xf */
buffer[VTOC_DISK_VOLUME]=254; /* typical volume 254 */
buffer[VTOC_MAX_TS_PAIRS]=((block_size-0xc)/2)&0xff;
/* Number of T/S pairs fitting */
/* in a T/S list sector */
/* Note, overflows if block_size>524 */
buffer[VTOC_LAST_ALLOC_T]=0x12; /* last track space was allocated */
/* Start at middle, work way out */
buffer[VTOC_ALLOC_DIRECT]=1; /* Working our way outward */
buffer[VTOC_NUM_TRACKS]=num_tracks;
buffer[VTOC_S_PER_TRACK]=num_sectors;
buffer[VTOC_BYTES_PER_SL]=block_size&0xff;
buffer[VTOC_BYTES_PER_SH]=(block_size>>8)&0xff;
/* if copying dos reserve tracks 1 and 2 as well */
if (copy_dos) {
buffer[VTOC_FREE_BITMAPS+4]=0x00;
buffer[VTOC_FREE_BITMAPS+5]=0x00;
buffer[VTOC_FREE_BITMAPS+6]=0x00;
buffer[VTOC_FREE_BITMAPS+7]=0x00;
buffer[VTOC_FREE_BITMAPS+8]=0x00;
buffer[VTOC_FREE_BITMAPS+9]=0x00;
buffer[VTOC_FREE_BITMAPS+10]=0x00;
buffer[VTOC_FREE_BITMAPS+11]=0x00;
}
/* reserve track 17 */
/* reserved for vtoc and catalog stuff */
buffer[VTOC_FREE_BITMAPS+17*4]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+1]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+2]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+3]=0x00;
/* Write out VTOC to disk */
lseek(fd,((17*num_sectors)+0)*block_size,SEEK_SET);
result=write(fd,buffer,block_size);
if (result<0) fprintf(stderr,"Error writing!\n");
/* Set sector bitmap so whole disk is free */
for(i=VTOC_FREE_BITMAPS;i<block_size;i+=4) {
buffer[i]=0xff;
buffer[i+1]=0xff;
if (num_sectors>16) {
buffer[i+2]=0xff;
buffer[i+3]=0xff;
}
}
/* reserve track 0 */
/* No user data can be stored here as track=0 is special case */
/* end of file indicator */
buffer[VTOC_FREE_BITMAPS]=0x00;
buffer[VTOC_FREE_BITMAPS+1]=0x00;
buffer[VTOC_FREE_BITMAPS+2]=0x00;
buffer[VTOC_FREE_BITMAPS+3]=0x00;
close(fd);
end_of_program:
return 0;
/* if copying dos reserve tracks 1 and 2 as well */
if (copy_dos) {
buffer[VTOC_FREE_BITMAPS+4]=0x00;
buffer[VTOC_FREE_BITMAPS+5]=0x00;
buffer[VTOC_FREE_BITMAPS+6]=0x00;
buffer[VTOC_FREE_BITMAPS+7]=0x00;
buffer[VTOC_FREE_BITMAPS+8]=0x00;
buffer[VTOC_FREE_BITMAPS+9]=0x00;
buffer[VTOC_FREE_BITMAPS+10]=0x00;
buffer[VTOC_FREE_BITMAPS+11]=0x00;
}
/* reserve track 17 (0x11) */
/* reserved for vtoc and catalog stuff */
buffer[VTOC_FREE_BITMAPS+17*4]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+1]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+2]=0x00;
buffer[VTOC_FREE_BITMAPS+17*4+3]=0x00;
/* Write out VTOC to disk */
lseek(fd,((17*num_sectors)+0)*block_size,SEEK_SET);
result=write(fd,buffer,block_size);
if (result<0) fprintf(stderr,"Error writing!\n");
close(fd);
end_of_program:
return 0;
}