/*
 * Copyright (c) 2011-2012, Centre National d'Etudes Spatiales (CNES), France 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * compare_raw_files.c
 *
 *  Created on: 31 August 2011
 *      Author: mickael
 *
 * This is equivalent to the UNIX `cmp` command
 */

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

#include "opj_getopt.h"

typedef struct test_cmp_parameters
{
  /**  */
  char* base_filename;
  /**  */
  char* test_filename;
} test_cmp_parameters;

/*******************************************************************************
 * Command line help function
 *******************************************************************************/
static void compare_raw_files_help_display(void) {
  fprintf(stdout,"\nList of parameters for the compare_raw_files function  \n");
  fprintf(stdout,"\n");
  fprintf(stdout,"  -b \t REQUIRED \t filename to the reference/baseline RAW image \n");
  fprintf(stdout,"  -t \t REQUIRED \t filename to the test RAW image\n");
  fprintf(stdout,"\n");
}

/*******************************************************************************
 * Parse command line
 *******************************************************************************/
static int parse_cmdline_cmp(int argc, char **argv, test_cmp_parameters* param)
{
  size_t sizemembasefile, sizememtestfile;
  int index;
  const char optlist[] = "b:t:";
  int c;

  /* Init parameters*/
  param->base_filename = NULL;
  param->test_filename = NULL;

  opj_opterr = 0;
  while ((c = opj_getopt(argc, argv, optlist)) != -1)
    switch (c)
      {
    case 'b':
      sizemembasefile = strlen(opj_optarg)+1;
      free(param->base_filename); /* handle dup option */
      param->base_filename = (char*) malloc(sizemembasefile);
      strcpy(param->base_filename, opj_optarg);
      /*printf("param->base_filename = %s [%d / %d]\n", param->base_filename, strlen(param->base_filename), sizemembasefile );*/
      break;
    case 't':
      sizememtestfile = strlen(opj_optarg) + 1;
      free(param->test_filename); /* handle dup option */
      param->test_filename = (char*) malloc(sizememtestfile);
      strcpy(param->test_filename, opj_optarg);
      /*printf("param->test_filename = %s [%d / %d]\n", param->test_filename, strlen(param->test_filename), sizememtestfile);*/
      break;
    case '?':
      if ((opj_optopt == 'b') || (opj_optopt == 't'))
        fprintf(stderr, "Option -%c requires an argument.\n", opj_optopt);
      else
        if (isprint(opj_optopt))	fprintf(stderr, "Unknown option `-%c'.\n", opj_optopt);
        else	fprintf(stderr, "Unknown option character `\\x%x'.\n", opj_optopt);
      return 1;
    default:
      fprintf(stderr, "WARNING -> this option is not valid \"-%c %s\"\n", c, opj_optarg);
      break;
      }

  if (opj_optind != argc) {
    for (index = opj_optind; index < argc; index++)
      fprintf(stderr,"Non-option argument %s\n", argv[index]);
    return 1;
  }

  return 0;
}

/*******************************************************************************
 * MAIN
 *******************************************************************************/
int main(int argc, char **argv)
{
  int pos = 0;
  test_cmp_parameters inParam;
  FILE *file_test=NULL, *file_base=NULL;
  unsigned char equal = 0U; /* returns error by default */

  /* Get parameters from command line*/
  if (parse_cmdline_cmp(argc, argv, &inParam))
  {
    compare_raw_files_help_display();
    goto cleanup;
  }

  file_test = fopen(inParam.test_filename, "rb");
  if (!file_test) {
    fprintf(stderr, "Failed to open %s for reading !!\n", inParam.test_filename);
    goto cleanup;
  }

  file_base = fopen(inParam.base_filename, "rb");
  if (!file_base) {
    fprintf(stderr, "Failed to open %s for reading !!\n", inParam.base_filename);
    goto cleanup;
  }

  /* Read simultaneously the two files*/
  equal = 1U;
  while (equal)
  {
    unsigned char value_test = 0;
    unsigned char eof_test = 0;
    unsigned char value_base = 0;
    unsigned char eof_base = 0;

    /* Read one byte*/
    if (!fread(&value_test, 1, 1, file_test)) {
      eof_test = 1;
    }

    /* Read one byte*/
    if (!fread(&value_base, 1, 1, file_base)) {
      eof_base = 1;
    }

    /* End of file reached by the two files?*/
    if (eof_test && eof_base)
      break;

    /* End of file reached only by one file?*/
    if (eof_test || eof_base)
    {
      fprintf(stdout,"Files have different sizes.\n");
      equal = 0;
    }

    /* Binary values are equal?*/
    if (value_test != value_base)
    {
      fprintf(stdout,"Binary values read in the file are different %x vs %x at position %d.\n", value_test, value_base, pos);
      equal = 0;
    }
    pos++;
  }

  if(equal) fprintf(stdout,"---- TEST SUCCEED: Files are equal ----\n");
cleanup:
  if(file_test) fclose(file_test);
  if(file_base) fclose(file_base);

  /* Free Memory */
  free(inParam.base_filename);
  free(inParam.test_filename);

  return equal ? EXIT_SUCCESS : EXIT_FAILURE;
}