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mgba
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Serialize ROM CRC32 for error checking

This commit is contained in:
Jeffrey Pfau 2014-07-20 15:10:59 -07:00
parent b4d6d11d19
commit 7a0f86ae99
4 changed files with 13 additions and 2 deletions
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5
src/gba/gba-serialize.c
View File

@ -14,6 +14,8 @@ const uint32_t GBA_SAVESTATE_MAGIC = 0x01000000;
void GBASerialize(struct GBA* gba, struct GBASerializedState* state) {
state->versionMagic = GBA_SAVESTATE_MAGIC;
state->biosChecksum = gba->biosChecksum;
state->romCrc32 = gba->romCrc32;
state->id = ((struct GBACartridge*) gba->memory.rom)->id;
memcpy(state->title, ((struct GBACartridge*) gba->memory.rom)->title, sizeof(state->title));
@ -46,6 +48,9 @@ void GBADeserialize(struct GBA* gba, struct GBASerializedState* state) {
GBALog(gba, GBA_LOG_WARN, "Savestate is for a different game");
return;
}
if (state->romCrc32 != gba->romCrc32) {
GBALog(gba, GBA_LOG_WARN, "Savestate is for a different version of the game");
}
memcpy(gba->cpu->gprs, state->cpu.gprs, sizeof(gba->cpu->gprs));
gba->cpu->cpsr = state->cpu.cpsr;
gba->cpu->spsr = state->cpu.spsr;

6
src/gba/gba-serialize.h
View File

@ -10,7 +10,8 @@ const uint32_t GBA_SAVESTATE_MAGIC;
/* Savestate format:
* 0x00000 - 0x00003: Version Magic (0x01000000)
* 0x00004 - 0x00007: BIOS checksum (e.g. 0xBAAE187F for official BIOS)
* 0x00008 - 0x0000F: Reserved (leave zero)
* 0x00008 - 0x0000B: ROM CRC32
* 0x0000C - 0x0000F: Reserved (leave zero)
* 0x00010 - 0x0001B: Game title (e.g. METROID4USA)
* 0x0001C - 0x0001F: Game code (e.g. AMTE)
* 0x00020 - 0x0012F: CPU state:
@ -133,7 +134,8 @@ const uint32_t GBA_SAVESTATE_MAGIC;
struct GBASerializedState {
uint32_t versionMagic;
uint32_t biosChecksum;
uint32_t reservedHeader[2];
uint32_t romCrc32;
uint32_t reservedHeader;
char title[12];
uint32_t id;

3
src/gba/gba.c
View File

@ -6,6 +6,7 @@
#include "gba-sio.h"
#include "gba-thread.h"
#include "util/crc32.h"
#include "util/memory.h"
#include "util/patch.h"
#include "util/vfs.h"
@ -390,6 +391,7 @@ void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char
gba->memory.rom = gba->pristineRom;
gba->activeFile = fname;
gba->memory.romSize = gba->pristineRomSize;
gba->romCrc32 = crc32(gba->memory.rom, gba->memory.romSize);
GBASavedataInit(&gba->memory.savedata, sav);
GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
_checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
@ -429,6 +431,7 @@ void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
return;
}
gba->memory.romSize = patchedSize;
gba->romCrc32 = crc32(gba->memory.rom, gba->memory.romSize);
}
void GBATimerUpdateRegister(struct GBA* gba, int timer) {

1
src/gba/gba.h
View File

@ -101,6 +101,7 @@ struct GBA {
struct GBARRContext* rr;
void* pristineRom;
size_t pristineRomSize;
uint32_t romCrc32;
struct VFile* romVf;
struct VFile* biosVf;