static void *psygnosis_c_track0_write_raw(
struct disk *d, unsigned int tracknr, struct stream *s)
{
struct track_info *ti = &d->di->track[tracknr];
uint16_t dat[V1_METABLK_WORDS+1], raw[2];
char *ablk, *block;
unsigned int i, metablk_words, ver;
init_track_info(ti, TRKTYP_amigados);
ablk = handlers[TRKTYP_amigados]->write_raw(d, tracknr, s);
if ((ablk == NULL) || (ti->type != TRKTYP_amigados))
goto fail;
for (ver = 1; ver <= 2; ver++) {
stream_reset(s);
metablk_words = (ver == 1) ? V1_METABLK_WORDS : V2_METABLK_WORDS;
while (stream_next_bit(s) != -1) {
if ((uint16_t)s->word != 0x428a)
continue;
ti->data_bitoff = s->index_offset - 15;
if ((ver == 2) &&
((stream_next_bits(s, 16) == -1) ||
((uint16_t)s->word != 0xaaaa)))
continue;
for (i = 0; i < (metablk_words + 1); i++) {
if (stream_next_bytes(s, raw, 4) == -1)
break;
mfm_decode_bytes(bc_mfm_even_odd, 2, raw, &dat[i]);
}
if (checksum(&dat[1], metablk_words, ver) != be16toh(dat[0]))
continue;
init_track_info(ti, TRKTYP_psygnosis_c_track0);
ti->len += metablk_words*2;
ti->total_bits = 105500;
block = memalloc(ti->len);
memcpy(block, ablk, 512*11);
memcpy(&block[512*11], &dat[1], metablk_words*2);
memfree(ablk);
return block;
}
}
fail:
memfree(ablk);
return NULL;
}
static struct container *eadf_open(struct disk *d)
{
struct disk_header dhdr;
struct track_header thdr;
struct disk_info *di;
struct track_info *ti;
unsigned int i;
lseek(d->fd, 0, SEEK_SET);
read_exact(d->fd, &dhdr, sizeof(dhdr));
if (strncmp(dhdr.sig, "UAE-1ADF", sizeof(dhdr.sig)))
return NULL;
d->di = di = memalloc(sizeof(*di));
di->nr_tracks = be16toh(dhdr.nr_tracks);
di->track = memalloc(di->nr_tracks * sizeof(struct track_info));
for (i = 0; i < di->nr_tracks; i++) {
ti = &di->track[i];
read_exact(d->fd, &thdr, sizeof(thdr));
thdr.type = be16toh(thdr.type);
if (thdr.type != 1) {
warnx("Bad track type %u in Ext-ADF", thdr.type);
goto cleanup_error;
}
init_track_info(ti, TRKTYP_raw);
ti->len = be32toh(thdr.len);
if (ti->len == 0) {
init_track_info(ti, TRKTYP_unformatted);
ti->total_bits = TRK_WEAK;
} else {
ti->dat = memalloc(ti->len);
ti->total_bits = be32toh(thdr.bitlen);
}
}
for (i = 0; i < di->nr_tracks; i++) {
ti = &di->track[i];
read_exact(d->fd, ti->dat, ti->len);
}
return &container_eadf;
cleanup_error:
for (i = 0; i < di->nr_tracks; i++)
memfree(di->track[i].dat);
memfree(di->track);
memfree(di);
d->di = NULL;
return NULL;
}
static void *interceptor_software_write_raw(
struct disk *d, unsigned int tracknr, struct stream *s)
{
struct track_info *ti = &d->di->track[tracknr];
char *ablk;
unsigned int i;
init_track_info(ti, TRKTYP_amigados);
ablk = handlers[TRKTYP_amigados]->write_raw(d, tracknr, s);
if ((ablk == NULL) || (ti->type != TRKTYP_amigados))
goto fail;
stream_reset(s);
while (stream_next_bit(s) != -1) {
/* Sync word 0xa144 precedes the AmigaDOS block by ~2000 bits. */
if ((uint16_t)s->word != 0xa144)
continue;
ti->data_bitoff = s->index_offset_bc - 15;
/* Check for a decent-length zero sequence after the sync. */
for (i = 0; i < 32; i++)
if ((stream_next_bits(s, 32) == -1)
|| mfm_decode_word(s->word))
break;
if (i != 32)
continue;
/* Skip 104400 bits after the sync pattern. Check for 0xa145
* fill pattern, repeating. */
stream_next_bits(s, 104400-32*32);
if (s->word != 0xa145a145)
continue;
init_track_info(ti, TRKTYP_interceptor_software);
ti->total_bits = 105550;
return ablk;
}
fail:
memfree(ablk);
return NULL;
}
static void adf_init_track(struct track_info *ti)
{
unsigned int i;
init_track_info(ti, TRKTYP_amigados);
ti->dat = memalloc(ti->len);
ti->data_bitoff = 1024;
ti->total_bits = DEFAULT_BITS_PER_TRACK;
set_all_sectors_invalid(ti);
for (i = 0; i < ti->len/4; i++)
memcpy(ti->dat+i*4, "NDOS", 4);
}