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PSX: add encryption map generation (markun).

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This commit is contained in:
Sorgelig
2022-02-06 23:02:12 +08:00
parent ec174d41e9
commit 96b3fa9275
1 changed files with 60 additions and 0 deletions
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60
support/psx/psx.cpp
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@@ -110,6 +110,57 @@ static int get_bin(const char *cue)
return res;
}
static uint32_t libCryptSectors[16] =
{
14105,
14231,
14485,
14579,
14649,
14899,
15056,
15130,
15242,
15312,
15378,
15628,
15919,
16031,
16101,
16167,
};
static uint32_t msfToLba(uint32_t m, uint32_t s, uint32_t f)
{
return (m * 60 + s) * 75 + f;
}
static uint8_t bcdToDec(uint8_t bcd)
{
return (bcd >> 4) * 10 + (bcd & 0x0F);
}
#define SBI_HEADER_SIZE 4
#define SBI_BLOCK_SIZE 14
static uint16_t libCryptMask(const char *sbifile)
{
int sz;
uint16_t mask = 0;
if ((sz = FileLoad(sbifile, buf, sizeof(buf))))
{
for (int i = 0;; i++)
{
int pos = SBI_HEADER_SIZE + i * SBI_BLOCK_SIZE;
if (pos >= sz) break;
uint32_t lba = msfToLba(bcdToDec(buf[pos]), bcdToDec(buf[pos + 1]), bcdToDec(buf[pos + 2]));
for (int m = 0; m < 16; m++) if (libCryptSectors[m] == lba) mask |= (1 << (15 - m));
}
}
return mask;
}
void psx_mount_cd(int f_index, int s_index, const char *filename)
{
static char last_dir[1024] = {};
@@ -154,6 +205,15 @@ void psx_mount_cd(int f_index, int s_index, const char *filename)
if (loaded)
{
strcpy(buf, filename);
strcpy((name_len > 4) ? buf + name_len - 4 : buf + name_len, ".sbi");
uint16_t mask = libCryptMask(buf);
user_io_set_index(250);
user_io_set_download(1);
user_io_file_tx_data((const uint8_t*)&mask, 2);
user_io_set_download(0);
user_io_set_index(f_index);
process_ss(filename, name_len != 0);