Extracts pl3 and hermes payloads from psgroove hex files (to be used in psfreedom)

hex2bin.c

static const char *PL_START = "000000000000FACEB003AABBCCDD";
static const char *PL3_START = "505347726F6F7665";
static const char *PL3_END = "1201000200000008AAAABBBB";
unsigned int PL_SIZE = 3822;

int hex2bin(char *hex_file, char *bin_file) {
  FILE *infile, *outfile;
  char line[100];
  char buffer[50*1024];
  char outc = 0;

  if ((infile = fopen(hex_file, "r")) == NULL) {
    return -1;
  }

  if ((outfile = fopen(bin_file, "wb")) == NULL) {
    fclose(infile);
    return -2;
  }

  unsigned int len = 0;
  while (fgets(line, sizeof(line), infile) != NULL) {
    if (len + 32 >= sizeof(buffer)) break; // prevent overflow
    strncat(buffer, line+9, 32);
    len += 32;
  }

  char *start = strstr(buffer, PL_START);

  // check for PL3
  if (start == NULL) {
    start = strstr(buffer, PL3_START);
    if (start != NULL) {
      char *end = strstr(buffer, PL3_END);
      if (end != NULL) {
        start += strlen(PL3_START);
        PL_SIZE = (end-start) / 2;
      } else {
        start = NULL;
      }
    }
  }

  // Can't find payload inside hex =(
  if (start == NULL) {
    fclose(infile);
    fclose(outfile);
    unlink(bin_file);
    return -3;
  }

  unsigned int pos;
  for (pos = 0; pos < PL_SIZE*2; pos += 2) {
    sscanf(start+pos, "%2hhx", &outc);
    fputc(outc, outfile);
  }

  fclose(infile);
  fclose(outfile);

  return 0;
}