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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void performFileIO(const char *infile)
{
  FILE *FileIn, *FileOut;
  char inBuffer[BUFSIZ];
  char tempBuffer[4], *tempptr;
  char outStringData[256];
  int currentFile = 1, position = 0;
  // marks the header of a file found within the input file
  const unsigned char pattern[] = {0xFF, 0x57, 0x50, 0x43};
  long int fileLength;

  // properly open the binary file for reading
  FileIn = fopen(infile, "rb");

  if (FileIn == NULL) {
    printf("The file could not be opened, please check your file and location before trying again.\n");
    exit(1);
  }

  printf("Enter the name and path for the output file: ");
  gets(inBuffer);
  FileOut = fopen(inBuffer, "w+b");

  // position the file marker at the beginning of file
  fseek(FileIn, 0, SEEK_SET); 

  while (!feof(FileIn))
  {
    position++;

    if (fgetc(FileIn) == pattern[0]) {
      tempBuffer[0] = pattern[0];
      fread(tempBuffer + 1, sizeof(pattern) - 1, 1, FileIn);

      if (memcmp(pattern, tempBuffer, sizeof(pattern)) == 0) {
        printf("Match Found.\n");

        fseek(FileIn, 21, SEEK_CUR); // find the file size
        fread(tempBuffer, sizeof(pattern), 1, FileIn); // four byte size of file found
        fileLength = (tempBuffer[0] + tempBuffer[1] + tempBuffer[2] + tempBuffer[3]);

        // retract to the pattern header
        fseek(FileIn, -25, SEEK_CUR);
        printf("%d\n", fileLength); // test -> returns -55 

        //fread(tempptr, sizeof(char), total, FileIn);
        //fread(tempptr, sizeof(char), sizeof((int)*tempBuffer), FileIn);  // read up to the full length of file
        //sprintf(outStringData, "%-5i\tOffset: %-12i\tSize: %02x%02x%02x%02x\n", currentFile++, position - 1,
        //tempBuffer[0], tempBuffer[1], tempBuffer[2], tempBuffer[3]);
        //fwrite(outStringData, sizeof(char), strlen(outStringData), FileOut);
        //fwrite(tempptr, sizeof(*tempBuffer), strlen(tempptr), FileOut);
        //fwrite(tempptr, sizeof(char), sizeof((int)*tempBuffer), FileOut);
        //fwrite(tempptr, sizeof(char), fileLength, FileOut);

        fwrite(tempptr, sizeof(char) * fileLength, 1, FileOut);
        break; // just to test one run through a matched loop
        continue;
      }

      fseek(FileIn, -3, SEEK_CUR);
    }
  }

  // close the files and at the same time flush the buffers
  fclose(FileIn);
  fclose(FileOut);
}

// program entry point
int main(int argc, char *argv[])
{
  char buffer[BUFSIZ];

  printf("Please enter the name and path of the binary file: ");
  gets(buffer);

  performFileIO(buffer);

  printf("\n Done!\n Press enter to exit\n");
  getchar();

  return 0;
}