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Add encrypted .ogg from Ys VIII (PC)

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This commit is contained in:
bnnm 2018-04-20 17:02:56 +02:00
parent 84b1b31608
commit ab2cecf92d
3 changed files with 48 additions and 30 deletions
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1
src/formats.c
View File

@ -1000,6 +1000,7 @@ static const meta_info meta_info_list[] = {
{meta_OGG_ENO, "Ogg Vorbis (ENO header)"},
{meta_TXTP, "TXTP generic header"},
{meta_SMC_SMH, "Genki SMC+SMH header"},
{meta_OGG_YS8, "Ogg Vorbis (Ys VIII header)"},
#ifdef VGM_USE_FFMPEG
{meta_FFmpeg, "FFmpeg supported file format"},

76
src/meta/ogg_vorbis.c
View File

@ -111,8 +111,7 @@ static void psychic_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb
int i;
/* add 0x23 ('#') */
{
for (i = 0; i < bytes_read; i++)
for (i = 0; i < bytes_read; i++) {
((uint8_t*)ptr)[i] += 0x23;
}
}
@ -126,17 +125,14 @@ static void sngw_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, v
put_32bitBE(key, ov_streamfile->xor_value);
/* bytes are xor'd with key and nibble-swapped */
{
for (i = 0; i < bytes_read; i++) {
if (ov_streamfile->offset+i < 0x04) {
/* replace key in the first 4 bytes with "OggS" */
((uint8_t*)ptr)[i] = (uint8_t)header_id[(ov_streamfile->offset + i) % 4];
}
else {
uint8_t val = ((uint8_t*)ptr)[i] ^ key[(ov_streamfile->offset + i) % 4];
((uint8_t*)ptr)[i] = ((val << 4) & 0xf0) | ((val >> 4) & 0x0f);
}
/* bytes are xor'd with key and nibble-swapped, first "OggS" is changed */
for (i = 0; i < bytes_read; i++) {
if (ov_streamfile->offset+i < 0x04) {
((uint8_t*)ptr)[i] = (uint8_t)header_id[(ov_streamfile->offset + i) % 4];
}
else {
uint8_t val = ((uint8_t*)ptr)[i] ^ key[(ov_streamfile->offset + i) % 4];
((uint8_t*)ptr)[i] = ((val << 4) & 0xf0) | ((val >> 4) & 0x0f);
}
}
}
@ -150,9 +146,8 @@ static void isd_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, vo
int i;
/* bytes are xor'd with key */
{
for (i = 0; i < bytes_read; i++)
((uint8_t*)ptr)[i] ^= key[(ov_streamfile->offset + i) % 16];
for (i = 0; i < bytes_read; i++) {
((uint8_t*)ptr)[i] ^= key[(ov_streamfile->offset + i) % 16];
}
}
@ -162,16 +157,14 @@ static void l2sd_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, v
int i;
char *header_id = "OggS";
/* First "OggS" is changed */
{
for (i = 0; i < bytes_read; i++) {
if (ov_streamfile->offset+i < 0x04) {
/* replace key in the first 4 bytes with "OggS" */
((uint8_t*)ptr)[i] = (uint8_t)header_id[(ov_streamfile->offset + i) % 4];
}
else {
break;
}
/* first "OggS" is changed */
for (i = 0; i < bytes_read; i++) {
if (ov_streamfile->offset+i < 0x04) {
/* replace key in the first 4 bytes with "OggS" */
((uint8_t*)ptr)[i] = (uint8_t)header_id[(ov_streamfile->offset + i) % 4];
}
else {
break;
}
}
}
@ -210,6 +203,17 @@ static void eno_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, vo
}
}
static void ys8_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, void *datasource) {
size_t bytes_read = size*nmemb;
ogg_vorbis_streamfile * const ov_streamfile = datasource;
int i;
/* bytes are xor'd with key and nibble-swapped */
for (i = 0; i < bytes_read; i++) {
uint8_t val = ((uint8_t*)ptr)[i] ^ ov_streamfile->xor_value;
((uint8_t*)ptr)[i] = ((val << 4) & 0xf0) | ((val >> 4) & 0x0f);
}
}
/* Ogg Vorbis, by way of libvorbisfile; may contain loop comments */
VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
@ -225,6 +229,7 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
int is_l2sd = 0;
int is_rpgmvo = 0;
int is_eno = 0;
int is_ys8 = 0;
/* check extension */
@ -252,9 +257,7 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
/* check standard Ogg Vorbis */
if (is_ogg) {
/* check Psychic Software obfuscation (Darkwind: War on Wheels PC) */
if (read_32bitBE(0x00,streamFile) == 0x2c444430) {
if (read_32bitBE(0x00,streamFile) == 0x2c444430) { /* Psychic Software obfuscation [Darkwind: War on Wheels (PC)] */
is_psychic = 1;
ovmi.decryption_callback = psychic_ogg_decryption_callback;
}
@ -262,8 +265,12 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
is_l2sd = 1;
ovmi.decryption_callback = l2sd_ogg_decryption_callback;
}
else if (read_32bitBE(0x00,streamFile) == 0x048686C5) { /* XOR'ed + bitswapped "OggS" [Ys VIII (PC)] */
is_ys8 = 1;
ovmi.decryption_callback = ys8_ogg_decryption_callback;
}
else if (read_32bitBE(0x00,streamFile) != 0x4f676753) { /* "OggS" */
goto fail; /* not known (ex. Wwise) */
goto fail; /* unknown/not ogg (ex. Wwise) */
}
}
@ -326,6 +333,11 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
start_offset = 0x01;
}
/* check Ys VIII (PC) */
if (is_ys8) {
ovmi.xor_value = 0xF0;
ovmi.decryption_callback = ys8_ogg_decryption_callback;
}
if (is_um3) {
ovmi.meta_type = meta_OGG_UM3;
@ -343,6 +355,8 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
ovmi.meta_type = meta_OGG_RPGMV;
} else if (is_eno) {
ovmi.meta_type = meta_OGG_ENO;
} else if (is_ys8) {
ovmi.meta_type = meta_OGG_YS8;
} else {
ovmi.meta_type = meta_OGG_VORBIS;
}
@ -500,6 +514,8 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, ov_callb
loop_length_found = 1;
}
}
;VGM_LOG("OGG: user_comment=%s\n", user_comment);
}
}

1
src/vgmstream.h
View File

@ -670,6 +670,7 @@ typedef enum {
meta_OGG_ENO, /* Ogg Vorbis with encryption [Metronomicon (PC)] */
meta_TXTP, /* generic text playlist */
meta_SMC_SMH, /* Wangan Midnight (System 246) */
meta_OGG_YS8, /* Ogg Vorbis with encryption (Ys VIII PC) */
#ifdef VGM_USE_FFMPEG
meta_FFmpeg,