mirror of https://github.com/mgba-emu/mgba.git
UPS patch loading support
This commit is contained in:
parent
f420232bbf
commit
a450b0470a
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@ -400,6 +400,9 @@ void GBALoadBIOS(struct GBA* gba, int fd) {
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void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
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void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
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size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
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size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
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if (!patchedSize) {
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return;
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}
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gba->memory.rom = anonymousMemoryMap(patchedSize);
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gba->memory.rom = anonymousMemoryMap(patchedSize);
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memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
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memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
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if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
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if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
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@ -0,0 +1,104 @@
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/*-
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* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
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* code or tables extracted from it, as desired without restriction.
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*
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* First, the polynomial itself and its table of feedback terms. The
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* polynomial is
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* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
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*
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* Note that we take it "backwards" and put the highest-order term in
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* the lowest-order bit. The X^32 term is "implied"; the LSB is the
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* X^31 term, etc. The X^0 term (usually shown as "+1") results in
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* the MSB being 1
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*
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* Note that the usual hardware shift register implementation, which
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* is what we're using (we're merely optimizing it by doing eight-bit
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* chunks at a time) shifts bits into the lowest-order term. In our
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* implementation, that means shifting towards the right. Why do we
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* do it this way? Because the calculated CRC must be transmitted in
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* order from highest-order term to lowest-order term. UARTs transmit
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* characters in order from LSB to MSB. By storing the CRC this way
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* we hand it to the UART in the order low-byte to high-byte; the UART
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* sends each low-bit to hight-bit; and the result is transmission bit
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* by bit from highest- to lowest-order term without requiring any bit
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* shuffling on our part. Reception works similarly
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*
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* The feedback terms table consists of 256, 32-bit entries. Notes
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*
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* The table can be generated at runtime if desired; code to do so
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* is shown later. It might not be obvious, but the feedback
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* terms simply represent the results of eight shift/xor opera
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* tions for all combinations of data and CRC register values
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*
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* The values must be right-shifted by eight bits by the "updcrc
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* logic; the shift must be unsigned (bring in zeroes). On some
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* hardware you could probably optimize the shift in assembler by
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* using byte-swap instructions
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* polynomial $edb88320
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*
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*
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* CRC32 code derived from work by Gary S. Brown.
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*/
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#include "util/crc32.h"
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static uint32_t crc32Table[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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uint32_t crc32(const void* buf, size_t size) {
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updateCrc32(0, buf, size);
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}
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uint32_t updateCrc32(uint32_t crc, const void* buf, size_t size) {
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const uint8_t* p = buf;
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crc = ~crc;
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for (size_t i = 0; i < size; ++i) {
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crc = crc32Table[(crc ^ p[i]) & 0xFF] ^ (crc >> 8);
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}
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return ~crc;
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}
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@ -0,0 +1,10 @@
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#ifndef CRC32_H
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#define CRC32_H
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#include <stdint.h>
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#include <string.h>
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uint32_t crc32(const void* buf, size_t size);
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uint32_t updateCrc32(uint32_t crc, const void* buf, size_t size);
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#endif
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@ -0,0 +1,135 @@
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#include "util/patch-ips.h"
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#include "util/crc32.h"
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#include "util/patch.h"
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#include <stdint.h>
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#include <unistd.h>
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enum {
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IN_CHECKSUM = -12,
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OUT_CHECKSUM = -8,
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PATCH_CHECKSUM = -4,
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BUFFER_SIZE = 1024
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};
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static size_t _UPSOutputSize(struct Patch* patch, size_t inSize);
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static int _UPSApplyPatch(struct Patch* patch, void* out, size_t outSize);
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static size_t _UPSDecodeLength(int fd);
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int loadPatchUPS(struct Patch* patch) {
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lseek(patch->patchfd, 0, SEEK_SET);
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char buffer[BUFFER_SIZE];
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if (read(patch->patchfd, buffer, 4) != 4) {
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return 0;
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}
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if (memcmp(buffer, "UPS1", 4) != 0) {
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return 0;
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}
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size_t filesize = lseek(patch->patchfd, 0, SEEK_END);
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uint32_t goodCrc32;
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lseek(patch->patchfd, PATCH_CHECKSUM, SEEK_END);
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if (read(patch->patchfd, &goodCrc32, 4) != 4) {
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return 0;
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}
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size_t blocksize;
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size_t alreadyRead = 0;
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lseek(patch->patchfd, 0, SEEK_SET);
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uint32_t crc = 0;
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while (alreadyRead < filesize + PATCH_CHECKSUM) {
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size_t toRead = sizeof(buffer);
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if (toRead + alreadyRead > filesize + PATCH_CHECKSUM) {
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toRead = filesize + PATCH_CHECKSUM - alreadyRead;
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}
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blocksize = read(patch->patchfd, buffer, toRead);
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alreadyRead += blocksize;
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crc = updateCrc32(crc, buffer, blocksize);
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if (blocksize < toRead) {
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return 0;
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}
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}
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if (crc != goodCrc32) {
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return 0;
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}
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patch->outputSize = _UPSOutputSize;
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patch->applyPatch = _UPSApplyPatch;
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return 1;
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}
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size_t _UPSOutputSize(struct Patch* patch, size_t inSize) {
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(void) (inSize);
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lseek(patch->patchfd, 4, SEEK_SET);
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if (_UPSDecodeLength(patch->patchfd) != inSize) {
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return 0;
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}
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return _UPSDecodeLength(patch->patchfd);
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}
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int _UPSApplyPatch(struct Patch* patch, void* out, size_t outSize) {
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// TODO: Input checksum
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size_t filesize = lseek(patch->patchfd, 0, SEEK_END);
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lseek(patch->patchfd, 4, SEEK_SET);
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_UPSDecodeLength(patch->patchfd); // Discard input size
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if (_UPSDecodeLength(patch->patchfd) != outSize) {
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return 0;
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}
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size_t offset = 0;
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size_t alreadyRead = 0;
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uint8_t* buf = out;
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while (alreadyRead < filesize + IN_CHECKSUM) {
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offset += _UPSDecodeLength(patch->patchfd);
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uint8_t byte;
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while (1) {
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if (read(patch->patchfd, &byte, 1) != 1) {
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return 0;
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}
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buf[offset] ^= byte;
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++offset;
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if (!byte) {
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break;
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}
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}
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alreadyRead = lseek(patch->patchfd, 0, SEEK_CUR);
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}
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uint32_t goodCrc32;
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lseek(patch->patchfd, OUT_CHECKSUM, SEEK_END);
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if (read(patch->patchfd, &goodCrc32, 4) != 4) {
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return 0;
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}
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lseek(patch->patchfd, 0, SEEK_SET);
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if (crc32(out, outSize) != goodCrc32) {
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return 0;
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}
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return 1;
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}
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size_t _UPSDecodeLength(int fd) {
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size_t shift = 1;
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size_t value = 0;
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uint8_t byte;
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while (1) {
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if (read(fd, &byte, 1) != 1) {
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break;
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}
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value += (byte & 0x7f) * shift;
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if (byte & 0x80) {
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break;
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}
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shift <<= 7;
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value += shift;
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}
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return value;
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}
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#ifndef PATCH_UPS_H
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#define PATCH_UPS_H
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struct Patch;
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int loadPatchUPS(struct Patch* patch);
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#endif
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#include "util/patch.h"
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#include "util/patch.h"
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#include "util/patch-ips.h"
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#include "util/patch-ips.h"
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#include "util/patch-ups.h"
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int loadPatch(int patchfd, struct Patch* patch) {
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int loadPatch(int patchfd, struct Patch* patch) {
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patch->patchfd = patchfd;
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patch->patchfd = patchfd;
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@ -9,6 +10,10 @@ int loadPatch(int patchfd, struct Patch* patch) {
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return 1;
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return 1;
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}
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}
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if (loadPatchUPS(patch)) {
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return 1;
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}
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patch->outputSize = 0;
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patch->outputSize = 0;
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patch->applyPatch = 0;
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patch->applyPatch = 0;
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return 0;
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return 0;
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