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pcecd: detect US BIOS even if not bitswapped.

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This commit is contained in:
sorgelig
2020-06-03 22:25:00 +08:00
parent 6c95f84fea
commit bcff26e588
1 changed files with 16 additions and 10 deletions
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26
support/pcecd/pcecd.cpp
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@@ -140,14 +140,13 @@ static char us_sig[] =
static int load_bios(char *biosname, const char *cuename)
{
uint32_t size = FileLoad(biosname, 0, 0);
if (!size) return 0;
fileTYPE f;
if (!FileOpen(&f, biosname)) return 0;
uint8_t us_cart = 0;
uint32_t start = size & 0x3FF;
uint8_t us_cart = 0, swap = 0;
uint32_t start = f.size & 0x3FF;
uint32_t size = f.size;
if (size >= 262144)
{
@@ -156,7 +155,7 @@ static int load_bios(char *biosname, const char *cuename)
FileSeek(&f, start + size - 26, SEEK_SET);
memset(buf, 0, sizeof(buf));
FileReadAdv(&f, buf, 26);
us_cart = !memcmp(buf, us_sig, sizeof(us_sig)) ? 1 : 0;
swap = !memcmp(buf, us_sig, sizeof(us_sig)) ? 1 : 0;
}
user_io_set_index(0);
@@ -165,18 +164,25 @@ static int load_bios(char *biosname, const char *cuename)
while (size)
{
uint16_t chunk = (size > sizeof(buf)) ? sizeof(buf) : size;
int chunk = (size > sizeof(buf)) ? sizeof(buf) : size;
size -= chunk;
FileReadAdv(&f, buf, chunk);
if (us_cart)
if (swap)
{
for (uint32_t i = 0; i < chunk; i++)
for (int i = 0; i < chunk; i++)
{
unsigned char c = buf[i];
buf[i] = ((c & 1) << 7) | ((c & 2) << 5) | ((c & 4) << 3) | ((c & 8) << 1) | ((c & 16) >> 1) | ((c & 32) >> 3) | ((c & 64) >> 5) | ((c & 128) >> 7);
}
}
else if (f.size >= 262144)
{
for (int i = 0; i < chunk - 8; i++)
{
if (!memcmp(buf + i, "ALL DATA", 8)) us_cart = 1;
}
}
user_io_file_tx_write((uint8_t*)buf, chunk);
}
@@ -184,7 +190,7 @@ static int load_bios(char *biosname, const char *cuename)
user_io_file_mount(buf, 0, 1);
user_io_set_download(0);
pcecdd.SetRegion(us_cart);
pcecdd.SetRegion(swap | us_cart);
return 1;
}