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GBA: Detect when a BIOS file is not actually a BIOS file

This commit is contained in:
Jeffrey Pfau 2015-01-04 19:02:53 -08:00
parent 98a6510b92
commit 4fdb4991f4
3 changed files with 19 additions and 1 deletions
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2
src/gba/gba-thread.c
View File

@ -146,7 +146,7 @@ static THREAD_ENTRY _GBAThreadRun(void* context) {
if (threadContext->rom) {
GBALoadROM(&gba, threadContext->rom, threadContext->save, threadContext->fname);
if (threadContext->bios) {
if (threadContext->bios && GBAIsBIOS(threadContext->bios)) {
GBALoadBIOS(&gba, threadContext->bios);
}

17
src/gba/gba.c
View File

@ -680,6 +680,23 @@ bool GBAIsROM(struct VFile* vf) {
return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
}
bool GBAIsBIOS(struct VFile* vf) {
if (vf->seek(vf, 0, SEEK_SET) < 0) {
return false;
}
uint32_t interruptTable[7];
if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
return false;
}
int i;
for (i = 0; i < 7; ++i) {
if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
return false;
}
}
return true;
}
void GBAGetGameCode(struct GBA* gba, char* out) {
memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
}

1
src/gba/gba.h
View File

@ -170,6 +170,7 @@ void GBALoadBIOS(struct GBA* gba, struct VFile* vf);
void GBAApplyPatch(struct GBA* gba, struct Patch* patch);
bool GBAIsROM(struct VFile* vf);
bool GBAIsBIOS(struct VFile* vf);
void GBAGetGameCode(struct GBA* gba, char* out);
void GBAGetGameTitle(struct GBA* gba, char* out);