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xa: fix crash

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This commit is contained in:
bnnm 2024-01-05 17:33:36 +01:00
parent 9ea73c958e
commit 1442541585
1 changed files with 15 additions and 14 deletions
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29
src/meta/xa.c
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@ -30,7 +30,7 @@ VGMSTREAM* init_vgmstream_xa(STREAMFILE* sf) {
}
else {
/* non-blocked (ISO 2048 mode1/data) or incorrectly ripped: use TXTH */
goto fail;
return NULL;
}
/* .xa: common
@ -41,7 +41,7 @@ VGMSTREAM* init_vgmstream_xa(STREAMFILE* sf) {
* .xai: Quake II (PS1)
* (extensionless): bigfiles [Castlevania: Symphony of the Night (PS1)] */
if (!check_extensions(sf,"xa,str,pxa,grn,an2,,xai"))
goto fail;
return NULL;
/* Proper XA comes in raw (BIN 2352 mode2/form2) CD sectors, that contain XA subheaders.
* For headerless XA (ISO 2048 mode1/data) mode use TXTH. */
@ -138,15 +138,16 @@ fail:
static int xa_check_format(STREAMFILE *sf, off_t offset, int is_blocked) {
uint8_t frame_hdr[0x10];
int i, j, sector = 0, skip = 0;
off_t test_offset = offset;
const size_t sector_size = (is_blocked ? 0x900 : 0x800);
const size_t extra_size = (is_blocked ? 0x18 : 0x00);
const size_t frame_size = 0x80;
const int sector_max = 3;
const int skip_max = 32; /* videos interleave 7 or 15 sectors + 1 audio sector, maybe 31 too */
uint8_t frame_hdr[0x10];
int sector = 0, skip = 0;
uint32_t test_offset = offset;
/* test frames inside CD sectors */
while (sector < sector_max) {
if (is_blocked) {
@ -164,11 +165,11 @@ static int xa_check_format(STREAMFILE *sf, off_t offset, int is_blocked) {
test_offset += extra_size; /* header */
for (i = 0; i < (sector_size / frame_size); i++) {
for (int i = 0; i < (sector_size / frame_size); i++) {
read_streamfile(frame_hdr, test_offset, sizeof(frame_hdr), sf);
/* XA frame checks: filter indexes should be 0..3, and shifts 0..C */
for (j = 0; j < 16; j++) {
for (int j = 0; j < 16; j++) {
uint8_t header = get_u8(frame_hdr + j);
if (((header >> 4) & 0xF) > 0x03)
goto fail;
@ -180,11 +181,10 @@ static int xa_check_format(STREAMFILE *sf, off_t offset, int is_blocked) {
if (get_u32be(frame_hdr+0x00) != get_u32be(frame_hdr+0x04) ||
get_u32be(frame_hdr+0x08) != get_u32be(frame_hdr+0x0c))
goto fail;
/* blank frames should always use 0x0c0c0c0c due to how shift works, (in rare/unused file-channels it may be blank though) */
if (get_u32be(frame_hdr+0x00) == 0 &&
get_u32be(frame_hdr+0x04) == 0 &&
get_u32be(frame_hdr+0x08) == 0 &&
get_u32be(frame_hdr+0x0c) == 0)
/* blank frames should always use 0x0c0c0c0c due to how shift works, (in rare file-channels some frames may be blank though) */
if (i == 0 &&
get_u32be(frame_hdr+0x00) == 0 && get_u32be(frame_hdr+0x04) == 0 &&
get_u32be(frame_hdr+0x08) == 0 && get_u32be(frame_hdr+0x0c) == 0)
goto fail;
test_offset += 0x80;
@ -201,7 +201,7 @@ fail:
}
#define XA_MAX_CHANNELS 16
#define XA_MAX_CHANNELS 32 /* usually 08-16, seen ~24 in Langrisser V (PS1) */
typedef struct {
uint32_t info;
@ -270,9 +270,10 @@ static int xa_read_subsongs(STREAMFILE* sf, int target_subsong, uint32_t start,
if (xa_chan >= XA_MAX_CHANNELS) {
VGM_LOG("XA: too many channels: %x\n", xa_chan);
goto fail;
}
VGM_ASSERT((xa_submode & 0x01), "XA: end of audio at %x\n", offset); /* rare, signals last sector [Tetris (CD-i)] */
//;VGM_ASSERT((xa_submode & 0x01), "XA: end of audio at %x\n", offset); /* rare, signals last sector [Tetris (CD-i), Langrisser V (PS1)] */
//;VGM_ASSERT(is_eof, "XA: eof %02x%02x at %x\n", xa_file, xa_chan, offset); /* this sector still has data */
//;VGM_ASSERT(!is_audio, "XA: not audio at %x\n", offset);