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Fixes #129 Find Volume from disk image (#132)

This commit is contained in:
Stefan Arentz 2017-01-13 21:41:44 -05:00 committed by GitHub
parent 7acae93861
commit af139f2e2c
1 changed files with 19 additions and 1 deletions
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20
src/dsk.c
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@ -428,6 +428,19 @@ struct ewm_dsk_t *ewm_dsk_create(struct cpu_t *cpu) {
return dsk;
}
static uint8_t dsk_defourxfour(uint8_t h, uint8_t l) {
return ((h << 1) | 0x01) & l;
}
static uint8_t dsk_locate_volume_number(struct ewm_dsk_track_t *track) {
for (int i = 0; i < track->length / 2; i++) {
if (track->data[i+0] == 0xd5 && track->data[i+1] == 0xaa && track->data[i+2] == 0x96) {
return dsk_defourxfour(track->data[i+3], track->data[i+4]);
}
}
return 0;
}
int ewm_dsk_set_disk_data(struct ewm_dsk_t *dsk, uint8_t index, bool readonly, void *data, size_t length, int type) {
if (type == EWM_DSK_TYPE_UNKNOWN) {
return -1;
@ -458,7 +471,7 @@ int ewm_dsk_set_disk_data(struct ewm_dsk_t *dsk, uint8_t index, bool readonly, v
}
drive->loaded = true;
drive->volume = 254; // TODO Find Volume from disk image. Or does this not matter? I guess this gets lost in .dsk files.
drive->volume = 254; // Default volume number
drive->track = 0;
drive->head = 0;
drive->phase = 0;
@ -475,6 +488,11 @@ int ewm_dsk_set_disk_data(struct ewm_dsk_t *dsk, uint8_t index, bool readonly, v
drive->tracks[t].data = malloc(6656);
memcpy(drive->tracks[t].data, data + (t * 6656), 6656);
}
uint8_t volume = dsk_locate_volume_number(&drive->tracks[0]);
if (volume != 0) {
drive->volume = volume;
}
}
return 0;