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#include <stdint.h>
#include <stdio.h>
#include <openssl/sha.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
// mwasmarm patcher v1.0
// Patches the Metrowerk C compiler assembler to stop the line ending bug.
char mwasmarm_unpatched_sha1[] = "9d63877c776245129b4727b41d3e9e63cfc9cd28";
char mwasmarm_patched_sha1[] = "f5dea73bf90791e104cb59458bebae8b08a55484";
void fatal_printf(char *str, ...) {
va_list args;
va_start(args, str);
vprintf(str, args);
va_end(args);
exit(1);
}
// return size in bytes
int get_file_size (FILE * fp) {
int curpos = ftell(fp);
fseek(fp, 0, SEEK_END);
int result = ftell(fp);
fseek(fp, curpos, SEEK_SET);
return result;
}
void print_help(void) {
printf("mwasmarm patcher usage: input (example: mwasmarm_patcher mwasmarm.exe)\n");
}
int main(int argc, char *argv[]) {
unsigned char temp[SHA_DIGEST_LENGTH];
char buf[SHA_DIGEST_LENGTH*2];
if (argc != 2) {
print_help();
} else {
// Open the file and sha1 read it.
FILE *f = fopen(argv[1], "rb+");
if(f == NULL) {
fatal_printf("ERROR: No file detected\n");
}
int fsize = get_file_size(f);
char *string = malloc(fsize + 1);
fread(string, 1, fsize, f);
// Check if sha1 matches either known assembler hashes.
SHA1(string, fsize, temp);
for (int i=0; i < SHA_DIGEST_LENGTH; i++) {
sprintf((char*)&(buf[i*2]), "%02x", temp[i]);
}
if(!strcmp(buf, mwasmarm_unpatched_sha1)) {
// Unpatched, perform the patch.
fseek(f, 0x57644, SEEK_SET);
fputc(0x05, f);
printf("Supported unpatched version detected: assembler patched\n");
} else if(!strcmp(buf, mwasmarm_patched_sha1)) {
printf("Supported patched version detected: no action needed\n");
} else {
fatal_printf("ERROR: Unsupported mwasmarm.exe version\n");
}
}
return 0;
}
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