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https://github.com/pret/pmd-red.git
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69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "global.h"
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static const char SPLASH[] = "Small IPS patch utility\n"
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"Created by PikalaxALT on 23 June 2019 All Rights Reserved\n";
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static const char HELP[] = "ips_patch [-h] ROM PATCH OUT\n"
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"\n"
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" ROM - input ROM file\n"
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" PATCH - IPS patch file to apply\n"
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" OUT - path to write patched ROM\n"
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"\n"
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"Options:\n"
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" -h - show this message and exit\n";
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int main(int argc, char ** argv) {
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// Show a friendly message
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puts(SPLASH);
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// If requested, show help message
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if (argc >= 2 && strcmp(argv[1], "-h") == 0) {
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puts(HELP);
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return 0;
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}
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// Enforce CLI syntax
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if (argc != 4) FATAL_ERROR("usage: %s [-h] ROM PATCH OUT\n", argv[0]);
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FILE * rom = fopen(argv[1], "rb");
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if (rom == NULL) FATAL_ERROR("failed to open file \"%s\" for reading\n", argv[1]);
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FILE * patch = fopen(argv[2], "rb");
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if (patch == NULL) FATAL_ERROR("failed to open file \"%s\" for reading\n", argv[2]);
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FILE * out = fopen(argv[3], "wb");
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if (patch == NULL) FATAL_ERROR("failed to open file \"%s\" for writing\n", argv[3]);
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// IPS magic header
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char magic[5];
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if (fread(magic, 1, 5, patch) != 5) FATAL_ERROR("read magic\n");
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if (memcmp(magic, "PATCH", 5) != 0) FATAL_ERROR("malformed IPS patch\n");
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// Read the ROM into allocated memory.
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fseek(rom, 0, SEEK_END);
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size_t romsize = ftell(rom);
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fseek(rom, 0, SEEK_SET);
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char * buffer = malloc(romsize);
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if (buffer == NULL) FATAL_ERROR("failed to allocate dest buffer\n");
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if (fread(buffer, 1, romsize, rom) != romsize) FATAL_ERROR("read ROM\n");
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fclose(rom);
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while (1) {
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uint32_t offset;
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size_t size;
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// Read each hunk into the buffer, overwriting previous data.
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// If two or more hunks overlap, the newest one is retained.
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// A good IPS patch creator will avoid this.
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offset = (unsigned char)getc(patch) << 16;
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offset |= (unsigned char)getc(patch) << 8;
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offset |= (unsigned char)getc(patch);
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if (offset == 0x454F46) break; // end sentinel "EOF"
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size = (unsigned char)getc(patch) << 8;
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size |= (unsigned char)getc(patch);
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if (offset + size > romsize) FATAL_ERROR("segment extends past end of ROM\n");
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if (fread(buffer + offset, 1, size, patch) != size) FATAL_ERROR("read segment\n");
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}
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fclose(patch);
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// Write the patched ROM
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fwrite(buffer, 1, romsize, out);
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fclose(out);
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free(buffer);
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return 0;
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}
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