M src/gba/ereader.c → src/gba/ereader.c

@@ -16,6 +16,7 @@ static void _eReaderReset(struct GBACartridgeHardware* hw);
 static void _eReaderWriteControl0(struct GBACartridgeHardware* hw, uint8_t value);
 static void _eReaderWriteControl1(struct GBACartridgeHardware* hw, uint8_t value);
 static void _eReaderReadData(struct GBACartridgeHardware* hw);
+static void _eReaderReedSolomon(const uint8_t* input, uint8_t* output);
 
 const int EREADER_NYBBLE_5BIT[16][5] = {
 	{ 0, 0, 0, 0, 0 },
@@ -102,6 +103,54 @@ 54014,
 	54679
 };
 
+static const uint8_t BLOCK_HEADER[2][0x18] = {
+	{ 0x00, 0x02, 0x00, 0x01, 0x40, 0x10, 0x00, 0x1c, 0x10, 0x6f, 0x40, 0xda, 0x39, 0x25, 0x8e, 0xe0, 0x7b, 0xb5, 0x98, 0xb6, 0x5b, 0xcf, 0x7f, 0x72 },
+	{ 0x00, 0x03, 0x00, 0x19, 0x40, 0x10, 0x00, 0x2c, 0x0e, 0x88, 0xed, 0x82, 0x50, 0x67, 0xfb, 0xd1, 0x43, 0xee, 0x03, 0xc6, 0xc6, 0x2b, 0x2c, 0x93 }
+};
+
+static const uint8_t RS_POW[] = {
+	0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x87, 0x89, 0x95, 0xad, 0xdd, 0x3d, 0x7a, 0xf4,
+	0x6f, 0xde, 0x3b, 0x76, 0xec, 0x5f, 0xbe, 0xfb, 0x71, 0xe2, 0x43, 0x86, 0x8b, 0x91, 0xa5, 0xcd,
+	0x1d, 0x3a, 0x74, 0xe8, 0x57, 0xae, 0xdb, 0x31, 0x62, 0xc4, 0x0f, 0x1e, 0x3c, 0x78, 0xf0, 0x67,
+	0xce, 0x1b, 0x36, 0x6c, 0xd8, 0x37, 0x6e, 0xdc, 0x3f, 0x7e, 0xfc, 0x7f, 0xfe, 0x7b, 0xf6, 0x6b,
+	0xd6, 0x2b, 0x56, 0xac, 0xdf, 0x39, 0x72, 0xe4, 0x4f, 0x9e, 0xbb, 0xf1, 0x65, 0xca, 0x13, 0x26,
+	0x4c, 0x98, 0xb7, 0xe9, 0x55, 0xaa, 0xd3, 0x21, 0x42, 0x84, 0x8f, 0x99, 0xb5, 0xed, 0x5d, 0xba,
+	0xf3, 0x61, 0xc2, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x07, 0x0e, 0x1c, 0x38, 0x70, 0xe0,
+	0x47, 0x8e, 0x9b, 0xb1, 0xe5, 0x4d, 0x9a, 0xb3, 0xe1, 0x45, 0x8a, 0x93, 0xa1, 0xc5, 0x0d, 0x1a,
+	0x34, 0x68, 0xd0, 0x27, 0x4e, 0x9c, 0xbf, 0xf9, 0x75, 0xea, 0x53, 0xa6, 0xcb, 0x11, 0x22, 0x44,
+	0x88, 0x97, 0xa9, 0xd5, 0x2d, 0x5a, 0xb4, 0xef, 0x59, 0xb2, 0xe3, 0x41, 0x82, 0x83, 0x81, 0x85,
+	0x8d, 0x9d, 0xbd, 0xfd, 0x7d, 0xfa, 0x73, 0xe6, 0x4b, 0x96, 0xab, 0xd1, 0x25, 0x4a, 0x94, 0xaf,
+	0xd9, 0x35, 0x6a, 0xd4, 0x2f, 0x5e, 0xbc, 0xff, 0x79, 0xf2, 0x63, 0xc6, 0x0b, 0x16, 0x2c, 0x58,
+	0xb0, 0xe7, 0x49, 0x92, 0xa3, 0xc1, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, 0xc7, 0x09, 0x12, 0x24,
+	0x48, 0x90, 0xa7, 0xc9, 0x15, 0x2a, 0x54, 0xa8, 0xd7, 0x29, 0x52, 0xa4, 0xcf, 0x19, 0x32, 0x64,
+	0xc8, 0x17, 0x2e, 0x5c, 0xb8, 0xf7, 0x69, 0xd2, 0x23, 0x46, 0x8c, 0x9f, 0xb9, 0xf5, 0x6d, 0xda,
+	0x33, 0x66, 0xcc, 0x1f, 0x3e, 0x7c, 0xf8, 0x77, 0xee, 0x5b, 0xb6, 0xeb, 0x51, 0xa2, 0xc3, 0x00,
+};
+
+static const uint8_t RS_REV[] = {
+	0xff, 0x00, 0x01, 0x63, 0x02, 0xc6, 0x64, 0x6a, 0x03, 0xcd, 0xc7, 0xbc, 0x65, 0x7e, 0x6b, 0x2a,
+	0x04, 0x8d, 0xce, 0x4e, 0xc8, 0xd4, 0xbd, 0xe1, 0x66, 0xdd, 0x7f, 0x31, 0x6c, 0x20, 0x2b, 0xf3,
+	0x05, 0x57, 0x8e, 0xe8, 0xcf, 0xac, 0x4f, 0x83, 0xc9, 0xd9, 0xd5, 0x41, 0xbe, 0x94, 0xe2, 0xb4,
+	0x67, 0x27, 0xde, 0xf0, 0x80, 0xb1, 0x32, 0x35, 0x6d, 0x45, 0x21, 0x12, 0x2c, 0x0d, 0xf4, 0x38,
+	0x06, 0x9b, 0x58, 0x1a, 0x8f, 0x79, 0xe9, 0x70, 0xd0, 0xc2, 0xad, 0xa8, 0x50, 0x75, 0x84, 0x48,
+	0xca, 0xfc, 0xda, 0x8a, 0xd6, 0x54, 0x42, 0x24, 0xbf, 0x98, 0x95, 0xf9, 0xe3, 0x5e, 0xb5, 0x15,
+	0x68, 0x61, 0x28, 0xba, 0xdf, 0x4c, 0xf1, 0x2f, 0x81, 0xe6, 0xb2, 0x3f, 0x33, 0xee, 0x36, 0x10,
+	0x6e, 0x18, 0x46, 0xa6, 0x22, 0x88, 0x13, 0xf7, 0x2d, 0xb8, 0x0e, 0x3d, 0xf5, 0xa4, 0x39, 0x3b,
+	0x07, 0x9e, 0x9c, 0x9d, 0x59, 0x9f, 0x1b, 0x08, 0x90, 0x09, 0x7a, 0x1c, 0xea, 0xa0, 0x71, 0x5a,
+	0xd1, 0x1d, 0xc3, 0x7b, 0xae, 0x0a, 0xa9, 0x91, 0x51, 0x5b, 0x76, 0x72, 0x85, 0xa1, 0x49, 0xeb,
+	0xcb, 0x7c, 0xfd, 0xc4, 0xdb, 0x1e, 0x8b, 0xd2, 0xd7, 0x92, 0x55, 0xaa, 0x43, 0x0b, 0x25, 0xaf,
+	0xc0, 0x73, 0x99, 0x77, 0x96, 0x5c, 0xfa, 0x52, 0xe4, 0xec, 0x5f, 0x4a, 0xb6, 0xa2, 0x16, 0x86,
+	0x69, 0xc5, 0x62, 0xfe, 0x29, 0x7d, 0xbb, 0xcc, 0xe0, 0xd3, 0x4d, 0x8c, 0xf2, 0x1f, 0x30, 0xdc,
+	0x82, 0xab, 0xe7, 0x56, 0xb3, 0x93, 0x40, 0xd8, 0x34, 0xb0, 0xef, 0x26, 0x37, 0x0c, 0x11, 0x44,
+	0x6f, 0x78, 0x19, 0x9a, 0x47, 0x74, 0xa7, 0xc1, 0x23, 0x53, 0x89, 0xfb, 0x14, 0x5d, 0xf8, 0x97,
+	0x2e, 0x4b, 0xb9, 0x60, 0x0f, 0xed, 0x3e, 0xe5, 0xf6, 0x87, 0xa5, 0x17, 0x3a, 0xa3, 0x3c, 0xb7,
+};
+
+static const uint8_t RS_GG[] = {
+	0x00, 0x4b, 0xeb, 0xd5, 0xef, 0x4c, 0x71, 0x00, 0xf4, 0x00, 0x71, 0x4c, 0xef, 0xd5, 0xeb, 0x4b
+};
+
+
 void GBAHardwareInitEReader(struct GBACartridgeHardware* hw) {
 	hw->devices |= HW_EREADER;
 	_eReaderReset(hw);
@@ -238,47 +287,124 @@ origin[EREADER_DOTCODE_STRIDE * (16 + i) + 2] = (addr >> (15 - i)) & 1;
 	}
 }
 
+static void _eReaderReedSolomon(const uint8_t* input, uint8_t* output) {
+	uint8_t rsBuffer[64] = {};
+	int i;
+	for (i = 0; i < 48; ++i) {
+		rsBuffer[63 - i] = input[i];
+	}
+	for (i = 0; i < 48; ++i) {
+		unsigned z = RS_REV[rsBuffer[63 - i] ^ rsBuffer[15]];
+		int j;
+		for (j = 15; j >= 0; --j) {
+			unsigned x = 0;
+			if (j != 0) {
+				x = rsBuffer[j - 1];
+			}
+			if (z != 0xFF) {
+				unsigned y = RS_GG[j];
+				if (y != 0xFF) {
+					y += z;
+					if (y >= 0xFF) {
+						y -= 0xFF;
+					}
+					x ^= RS_POW[y];
+				}
+			}
+			rsBuffer[j] = x;
+		}
+	}
+	for (i = 0; i < 16; ++i) {
+		output[15 - i] = ~rsBuffer[i];
+	}
+}
+
 void GBAHardwareEReaderScan(struct GBACartridgeHardware* hw, const void* data, size_t size) {
 	if (!hw->eReaderDots) {
 		hw->eReaderDots = anonymousMemoryMap(EREADER_DOTCODE_SIZE);
 	}
 	memset(hw->eReaderDots, 0, EREADER_DOTCODE_SIZE);
 
+	uint8_t blockRS[44][0x10];
+	bool parsed = false;
+	size_t blocks;
 	int base;
 	switch (size) {
+	case 2112:
+		parsed = true;
+		// Fallthrough
 	case 2912:
 		base = 25;
+		blocks = 28;
 		break;
+	case 1344:
+		parsed = true;
+		// Fallthrough
 	case 1872:
 		base = 1;
+		blocks = 18;
 		break;
 	default:
 		return;
 	}
 
 	size_t i;
-	for (i = 0; i < (size / 104) + 1; ++i) {
+	for (i = 0; i < blocks + 1; ++i) {
 		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
 		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 0]);
 		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 35]);
 		_eReaderAddress(origin, base + i);
 	}
-	for (i = 0; i < size / 104; ++i) {
+	if (parsed) {
+		for (i = 0; i < size / 48; ++i) {
+			_eReaderReedSolomon(&((const uint8_t*) data)[i * 48], blockRS[i]);
+		}
+	}
+	size_t blockId = 0;
+	size_t byteOffset = 0;
+	for (i = 0; i < blocks; ++i) {
 		uint8_t block[1040];
 		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
 		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 2]);
 		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 37]);
 
+		const uint8_t* blockData;
+		uint8_t parsedBlockData[104];
+		if (parsed) {
+			memset(parsedBlockData, 0, sizeof(*parsedBlockData));
+			const uint8_t* header = BLOCK_HEADER[size == 1344 ? 0 : 1];
+			parsedBlockData[0] = header[(2 * i) % 0x18];
+			parsedBlockData[1] = header[(2 * i) % 0x18 + 1];
+			int j;
+			for (j = 2; j < 104; ++j) {
+			    if (byteOffset >= 0x40) {
+			        break;
+			    }
+			    if (byteOffset >= 0x30) {
+			        parsedBlockData[j] = blockRS[blockId][byteOffset - 0x30];
+			    } else {
+			        parsedBlockData[j] = ((const uint8_t*) data)[blockId * 0x30 + byteOffset];
+			    }
+			    ++blockId;
+			    if (blockId * 0x30 >= size) {
+			        blockId = 0;
+			        ++byteOffset;
+			    }
+			}
+			blockData = parsedBlockData;
+		} else {
+			blockData = &((const uint8_t*) data)[i * 104];
+		}
 		int b;
 		for (b = 0; b < 104; ++b) {
 			const int* nybble5;
-			nybble5 = EREADER_NYBBLE_5BIT[((const uint8_t*) data)[i * 104 + b] >> 4];
+			nybble5 = EREADER_NYBBLE_5BIT[blockData[b] >> 4];
 			block[b * 10 + 0] = nybble5[0];
 			block[b * 10 + 1] = nybble5[1];
 			block[b * 10 + 2] = nybble5[2];
 			block[b * 10 + 3] = nybble5[3];
 			block[b * 10 + 4] = nybble5[4];
-			nybble5 = EREADER_NYBBLE_5BIT[((const uint8_t*) data)[i * 104 + b] & 0xF];
+			nybble5 = EREADER_NYBBLE_5BIT[blockData[b] & 0xF];
 			block[b * 10 + 5] = nybble5[0];
 			block[b * 10 + 6] = nybble5[1];
 			block[b * 10 + 7] = nybble5[2];