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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 v1.1
// Patches the Metrowerk C compiler assembler to stop the line ending bug.
// Changelog:
// v1.1: Added patch definitions and looped over them to find the matching
// definition as well as the version.
struct PatchDef {
char *version;
char *sha1before;
char *sha1after;
int offsetPatch;
int newByte;
};
struct PatchDef gPatchDefs[] = {
// mwasmarm 1.2/base definition
{
"mwasmarm 1.2/base",
"87f942cc0a0e90e73550d8d6f3fffcdeb5f69fa5",
"2f1ccff22eaa443bb79235ca6477d3b86bdfd7e4",
0x57614,
0x5
},
// mwasmarm 2.0/base definition
{
"mwasmarm 2.0/base",
"9d63877c776245129b4727b41d3e9e63cfc9cd28",
"f5dea73bf90791e104cb59458bebae8b08a55484",
0x57644,
0x5
},
// mwasmarm 2.0/sp2p4 definition
{
"mwasmarm 2.0/sp2p4",
"448cb0c7f1ace4393e9a9562f819f7a9f049be83",
"c82161527277b991a1b77e14617a93bcd19cf95c",
0x57834,
0x5
},
{
}
};
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();
return 1;
} 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]);
}
for(int i = 0; gPatchDefs[i].sha1before != NULL; i++) {
// check if already patched for the current loop.
if(!strcmp(buf, gPatchDefs[i].sha1after)) {
printf("Supported patched version detected (%s): no action needed\n", gPatchDefs[i].version);
return 0;
} else if(!strcmp(buf, gPatchDefs[i].sha1before)) {
fseek(f, gPatchDefs[i].offsetPatch, SEEK_SET);
fputc(gPatchDefs[i].newByte, f);
printf("Supported unpatched version detected (%s): assembler patched\n", gPatchDefs[i].version);
return 0;
}
}
fatal_printf("ERROR: Unsupported mwasmarm.exe version\n");
}
return 0;
}
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