M src/gb/core.c → src/gb/core.c

@@ -9,6 +9,7 @@ #include "core/core.h"
 #include "gb/gb.h"
 #include "gb/renderers/software.h"
 #include "util/memory.h"
+#include "util/patch.h"
 
 struct GBCore {
 	struct mCore d;
@@ -97,11 +98,15 @@ return GBLoadSave(core->board, vf);
 }
 
 static bool _GBCoreLoadPatch(struct mCore* core, struct VFile* vf) {
-	// TODO
-	UNUSED(core);
-	UNUSED(vf);
-	mLOG(GB, STUB, "Patches are not yet supported");
-	return false;
+	if (!vf) {
+		return false;
+	}
+	struct Patch patch;
+	if (!loadPatch(vf, &patch)) {
+		return false;
+	}
+	GBApplyPatch(core->board, &patch);
+	return true;
 }
 
 static void _GBCoreUnloadROM(struct mCore* core) {

M src/gb/gb.c → src/gb/gb.c

@@ -126,6 +126,24 @@ }
 	gb->memory.sram = 0;
 }
 
+void GBApplyPatch(struct GB* gb, struct Patch* patch) {
+	size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
+	if (!patchedSize) {
+		return;
+	}
+	if (patchedSize > 0x400000) {
+		patchedSize = 0x400000;
+	}
+	gb->memory.rom = anonymousMemoryMap(0x400000);
+	if (!patch->applyPatch(patch, gb->pristineRom, gb->pristineRomSize, gb->memory.rom, patchedSize)) {
+		mappedMemoryFree(gb->memory.rom, patchedSize);
+		gb->memory.rom = gb->pristineRom;
+		return;
+	}
+	gb->memory.romSize = patchedSize;
+	gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
+}
+
 void GBDestroy(struct GB* gb) {
 	GBUnloadROM(gb);