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NDSCart : Abstract out common code in LoadROM()

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Signed-off-by: Madhav Kanbur <abcdjdj@gmail.com>
This commit is contained in:
Madhav Kanbur
2021-01-10 14:34:16 +05:30
parent bbd5656952
commit 509a8aac3d
1 changed files with 35 additions and 35 deletions
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70
src/NDSCart.cpp
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@ -885,46 +885,15 @@ void DecryptSecureArea(u8* out)
} }
} }
static bool LoadROMCommon(u32 filelength, const char *sram, bool direct)
bool LoadROM(const char* path, const char* sram, bool direct)
{ {
// TODO: streaming mode? for really big ROMs or systems with limited RAM
// for now we're lazy
// also TODO: validate what we're loading!!
FILE* f = Platform::OpenFile(path, "rb");
if (!f)
{
return false;
}
NDS::Reset();
fseek(f, 0, SEEK_END);
u32 len = (u32)ftell(f);
CartROMSize = 0x200;
while (CartROMSize < len)
CartROMSize <<= 1;
u32 gamecode; u32 gamecode;
fseek(f, 0x0C, SEEK_SET); memcpy(&gamecode, CartROM + 0x0C, 4);
fread(&gamecode, 4, 1, f);
printf("Game code: %c%c%c%c\n", gamecode&0xFF, (gamecode>>8)&0xFF, (gamecode>>16)&0xFF, gamecode>>24); printf("Game code: %c%c%c%c\n", gamecode&0xFF, (gamecode>>8)&0xFF, (gamecode>>16)&0xFF, gamecode>>24);
u8 unitcode; u8 unitcode = CartROM[0x12];
fseek(f, 0x12, SEEK_SET);
fread(&unitcode, 1, 1, f);
CartIsDSi = (unitcode & 0x02) != 0; CartIsDSi = (unitcode & 0x02) != 0;
CartROM = new u8[CartROMSize];
memset(CartROM, 0, CartROMSize);
fseek(f, 0, SEEK_SET);
fread(CartROM, 1, len, f);
fclose(f);
//CartROM = f;
ROMListEntry romparams; ROMListEntry romparams;
if (!ReadROMParams(gamecode, &romparams)) if (!ReadROMParams(gamecode, &romparams))
{ {
@ -941,7 +910,7 @@ bool LoadROM(const char* path, const char* sram, bool direct)
else else
printf("ROM entry: %08X %08X\n", romparams.ROMSize, romparams.SaveMemType); printf("ROM entry: %08X %08X\n", romparams.ROMSize, romparams.SaveMemType);
if (romparams.ROMSize != len) printf("!! bad ROM size %d (expected %d) rounded to %d\n", len, romparams.ROMSize, CartROMSize); if (romparams.ROMSize != filelength) printf("!! bad ROM size %d (expected %d) rounded to %d\n", filelength, romparams.ROMSize, CartROMSize);
// generate a ROM ID // generate a ROM ID
// note: most games don't check the actual value // note: most games don't check the actual value
@ -1026,6 +995,37 @@ bool LoadROM(const char* path, const char* sram, bool direct)
return true; return true;
} }
bool LoadROM(const char* path, const char* sram, bool direct)
{
// TODO: streaming mode? for really big ROMs or systems with limited RAM
// for now we're lazy
// also TODO: validate what we're loading!!
FILE* f = Platform::OpenFile(path, "rb");
if (!f)
{
return false;
}
NDS::Reset();
fseek(f, 0, SEEK_END);
u32 len = (u32)ftell(f);
CartROMSize = 0x200;
while (CartROMSize < len)
CartROMSize <<= 1;
CartROM = new u8[CartROMSize];
memset(CartROM, 0, CartROMSize);
fseek(f, 0, SEEK_SET);
fread(CartROM, 1, len, f);
fclose(f);
return LoadROMCommon(len, sram, direct);
}
void RelocateSave(const char* path, bool write) void RelocateSave(const char* path, bool write)
{ {
// herp derp // herp derp