/** Open specified .vtx file and read vtx file header
*
* Open specified .vtx file and read vtx file header in struct vtx
* Return value: true if success, else false
*/
int ayemu_vtx_open (ayemu_vtx_t *vtx, const char *filename)
{
char buf[2];
int error = 0;
int32_t int_regdata_size;
vtx->regdata = NULL;
if ((vtx->fp = vfs_fopen (filename, "rb")) == NULL) {
fprintf(stderr, "ayemu_vtx_open: Cannot open file %s: %s\n", filename, strerror(errno));
return 0;
}
if (vfs_fread(buf, 2, 1, vtx->fp) != 1) {
fprintf(stderr,"ayemu_vtx_open: Can't read from %s: %s\n", filename, strerror(errno));
error = 1;
}
buf[0] = tolower(buf[0]);
buf[1] = tolower(buf[1]);
if (strncmp(buf, "ay", 2) == 0)
vtx->hdr.chiptype = AYEMU_AY;
else if (strncmp (buf, "ym", 2) == 0)
vtx->hdr.chiptype = AYEMU_YM;
else {
fprintf (stderr, "File %s is _not_ VORTEX format!\nIt not begins from AY or YM.\n", filename);
error = 1;
}
/* read VTX header info in order format specified, see http:// ..... */
if (!error) error = read_byte(vtx->fp, &vtx->hdr.stereo);
if (!error) error = read_word16(vtx->fp, &vtx->hdr.loop);
if (!error) error = read_word32(vtx->fp, &vtx->hdr.chipFreq);
if (!error) error = read_byte(vtx->fp, &vtx->hdr.playerFreq);
if (!error) error = read_word16(vtx->fp, &vtx->hdr.year);
if (!error) {
error = read_word32(vtx->fp, &int_regdata_size);
vtx->hdr.regdata_size = (size_t) int_regdata_size;
}
if (!error) error = read_NTstring(vtx->fp, vtx->hdr.title);
if (!error) error = read_NTstring(vtx->fp, vtx->hdr.author);
if (!error) error = read_NTstring(vtx->fp, vtx->hdr.from);
if (!error) error = read_NTstring(vtx->fp, vtx->hdr.tracker);
if (!error) error = read_NTstring (vtx->fp, vtx->hdr.comment);
if (error) {
vfs_fclose(vtx->fp);
vtx->fp = NULL;
}
return !error;
}
static data_ptr_t read_header(data_ptr_t buf, ayemu_vtx_t **target, size_t size)
{
char hdr[3];
ayemu_vtx_t *vtx;
hdr[0] = tolower(*buf++);
hdr[1] = tolower(*buf++);
hdr[2] = '\0';
if (size < 20) {
fprintf(stderr, "ayemu_vtx_open: file size < 20 bytes - it is impossible\n");
return NULL;
}
vtx = (ayemu_vtx_t*) calloc(1, sizeof(ayemu_vtx_t));
if (strncmp(hdr, "ay", 2) == 0)
vtx->chiptype = AYEMU_AY;
else if (strncmp (hdr, "ym", 2) == 0)
vtx->chiptype = AYEMU_YM;
else {
trace ("File is _not_ VORTEX format!\n"
"It not begins with 'ay' or 'ym' string.\n");
goto clean_and_ret_null;
}
buf = read_byte(buf, &vtx->stereo);
buf = read_word16(buf, &vtx->loop);
buf = read_word32(buf, &vtx->chipFreq);
buf = read_byte(buf, &vtx->playerFreq);
buf = read_word16(buf, &vtx->year);
buf = read_word32(buf, &vtx->regdata_size);
buf = read_string(buf, &vtx->title);
buf = read_string(buf, &vtx->author);
buf = read_string(buf, &vtx->from);
buf = read_string(buf, &vtx->tracker);
buf = read_string(buf, &vtx->comment);
*target = vtx;
return buf;
clean_and_ret_null:
ayemu_vtx_free(vtx);
return NULL;
}