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MDS v2 structures and decode/crypto utilities from Marisa-Chan's repository in preparation for MDS v2/MDX support implementation.

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This commit is contained in:
OBattler
2026-01-18 03:56:57 +01:00
parent 605a1443de
commit 51effd0453
67 changed files with 21470 additions and 8 deletions
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66
src/cdrom/cdrom_image.c
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@@ -175,6 +175,20 @@ typedef struct
uint32_t trk_blocks_offs;
} mds_sess_block_t; /* 24 bytes */
/* MDF v2.01 session block. */
typedef struct
{
int64_t sess_start;
uint16_t sess_id;
uint8_t all_blocks_num;
uint8_t non_track_blocks_num;
uint16_t first_trk;
uint16_t last_trk;
uint32_t pad;
uint32_t trk_blocks_offs;
int64_t sess_end;
} mds_v2_sess_block_t; /* 24 bytes */
typedef struct
{
uint8_t trk_mode;
@@ -220,6 +234,17 @@ typedef struct
uint32_t pad0;
} mds_footer_t; /* 16 bytes */
/* MDF v2.01 track footer block. */
typedef struct
{
uint32_t fn_offs;
uint32_t pad; /* Always wide */
uint32_t pad0;
uint32_t pad1;
uint64_t trk_sectors;
uint64_t pad2;
} mds_v2_footer_t; /* 16 bytes */
typedef struct
{
uint32_t type;
@@ -1949,6 +1974,7 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
track_index_t *ci = NULL;
track_file_t *tf = NULL;
int is_viso = 0;
int version = 1;
int last_t = -1;
int error;
char pathname[MAX_FILENAME_LENGTH];
@@ -1956,9 +1982,11 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
mds_hdr_t mds_hdr = { 0 };
mds_sess_block_t mds_sess_block = { 0 };
mds_v2_sess_block_t mds_v2_sess_block = { 0 };
mds_trk_block_t mds_trk_block = { 0 };
mds_trk_ex_block_t mds_trk_ex_block = { 0 };
mds_footer_t mds_footer = { 0 };
mds_v2_footer_t mds_v2_footer = { 0 };
mds_dpm_block_t mds_dpm_block = { 0 };
uint32_t mds_dpm_blocks_num = 0x00000000;
uint32_t mds_dpm_block_offs = 0x00000000;
@@ -2006,6 +2034,7 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
#else
warning("\"%s\" is a Daemon Tools encrypted MDS which is not supported\n", mdsfile);
#endif
version = 2;
fclose(fp);
return 0;
}
@@ -2083,9 +2112,18 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
}
for (int s = 0; s < mds_hdr.sess_num; s++) {
fseek(fp, mds_hdr.sess_blocks_offs + (s * sizeof(mds_sess_block_t)), SEEK_SET);
if (fread(&mds_sess_block, 1, sizeof(mds_sess_block_t), fp) != sizeof(mds_sess_block_t))
return 0;
if (version == 2) {
fseek(fp, mds_hdr.sess_blocks_offs + (s * sizeof(mds_v2_sess_block_t)), SEEK_SET);
if (fread(&mds_v2_sess_block, 1, sizeof(mds_v2_sess_block_t), fp) != sizeof(mds_v2_sess_block_t))
return 0;
memcpy(&mds_sess_block, &mds_v2_sess_block, sizeof(mds_sess_block_t));
mds_sess_block.sess_start = (int32_t) mds_v2_sess_block.sess_start;
mds_sess_block.sess_end = (int32_t) mds_v2_sess_block.sess_end;
} else {
fseek(fp, mds_hdr.sess_blocks_offs + (s * sizeof(mds_sess_block_t)), SEEK_SET);
if (fread(&mds_sess_block, 1, sizeof(mds_sess_block_t), fp) != sizeof(mds_sess_block_t))
return 0;
}
for (int t = 0; t < mds_sess_block.all_blocks_num; t++) {
fseek(fp, mds_sess_block.trk_blocks_offs + (t * sizeof(mds_trk_block_t)), SEEK_SET);
@@ -2127,9 +2165,17 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
uint32_t astart2 = mds_trk_block.start_sect + mds_trk_ex_block.trk_sectors;
if (mds_trk_block.footer_offs != 0ULL) for (uint32_t ff = 0; ff < mds_trk_block.files_num; ff++) {
fseek(fp, mds_trk_block.footer_offs + (ff * sizeof(mds_footer_t)), SEEK_SET);
if (fread(&mds_footer, 1, sizeof(mds_footer_t), fp) != sizeof(mds_footer_t))
return 0;
if (version == 2) {
fseek(fp, mds_trk_block.footer_offs + (ff * sizeof(mds_v2_footer_t)), SEEK_SET);
if (fread(&mds_v2_footer, 1, sizeof(mds_v2_footer_t), fp) != sizeof(mds_v2_footer_t))
return 0;
memcpy(&mds_footer, &mds_v2_footer, sizeof(mds_footer));
mds_footer.fn_is_wide = 1;
} else {
fseek(fp, mds_trk_block.footer_offs + (ff * sizeof(mds_footer_t)), SEEK_SET);
if (fread(&mds_footer, 1, sizeof(mds_footer_t), fp) != sizeof(mds_footer_t))
return 0;
}
uint16_t wfn[2048] = { 0 };
char fn[2048] = { 0 };
@@ -2149,7 +2195,10 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
break;
}
if (!stricmp(fn, "*.mdf")) {
if (strlen(fn) == 0)
/* This is in MDX files - the file name string is empty. */
strcpy(fn, mdsfile);
else if (!stricmp(fn, "*.mdf")) {
strcpy(fn, mdsfile);
fn[strlen(mdsfile) - 3] = 'm';
fn[strlen(mdsfile) - 2] = 'd';
@@ -2681,7 +2730,8 @@ image_open(cdrom_t *dev, const char *path)
if (img != NULL) {
int ret;
const int is_cue = ((ext == 4) && !stricmp(path + strlen(path) - ext + 1, "CUE"));
const int is_mds = ((ext == 4) && !stricmp(path + strlen(path) - ext + 1, "MDS"));
const int is_mds = ((ext == 4) && (!stricmp(path + strlen(path) - ext + 1, "MDS") ||
!stricmp(path + strlen(path) - ext + 1, "MDX")));
char n[1024] = { 0 };
sprintf(n, "CD-ROM %i Image", dev->id + 1);