/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <sparse/sparse.h>

#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef O_BINARY
#define O_BINARY 0
#endif

void usage() {
  fprintf(stderr, "Usage: simg2img <sparse_image_files> <raw_image_file>\n");
}

int main(int argc, char* argv[]) {
  int in;
  int out;
  int i;
  struct sparse_file* s;

  if (argc < 3) {
    usage();
    exit(EXIT_FAILURE);
  }

  out = open(argv[argc - 1], O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
  if (out < 0) {
    fprintf(stderr, "Cannot open output file %s\n", argv[argc - 1]);
    exit(EXIT_FAILURE);
  }

  for (i = 1; i < argc - 1; i++) {
    if (strcmp(argv[i], "-") == 0) {
      in = STDIN_FILENO;
    } else {
      in = open(argv[i], O_RDONLY | O_BINARY);
      if (in < 0) {
        fprintf(stderr, "Cannot open input file %s\n", argv[i]);
        exit(EXIT_FAILURE);
      }
    }

    s = sparse_file_import(in, true, false);
    if (!s) {
      fprintf(stderr, "Failed to read sparse file\n");
      exit(EXIT_FAILURE);
    }

    if (lseek(out, 0, SEEK_SET) == -1) {
      perror("lseek failed");
      exit(EXIT_FAILURE);
    }

    if (sparse_file_write(s, out, false, false, false) < 0) {
      fprintf(stderr, "Cannot write output file\n");
      exit(EXIT_FAILURE);
    }
    sparse_file_destroy(s);
    close(in);
  }

  close(out);

  exit(EXIT_SUCCESS);
}