/*
 * Copyright (C) 2012 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.
 */

#define _FILE_OFFSET_BITS 64
#define _LARGEFILE64_SOURCE 1
#define _GNU_SOURCE

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

#include <sparse/sparse.h>

#ifndef O_BINARY
#define O_BINARY 0
#endif

void usage()
{
  fprintf(stderr, "Usage: simg2simg <sparse image file> <sparse_image_file> <max_size>\n");
}

int main(int argc, char *argv[])
{
	int in;
	int out;
	int i;
	int ret;
	struct sparse_file *s;
	int64_t max_size;
	struct sparse_file **out_s;
	int files;
	char filename[4096];

	if (argc != 4) {
		usage();
		exit(-1);
	}

	max_size = atoll(argv[3]);

	in = open(argv[1], O_RDONLY | O_BINARY);
	if (in < 0) {
		fprintf(stderr, "Cannot open input file %s\n", argv[1]);
		exit(-1);
	}

	s = sparse_file_import(in, true, false);
	if (!s) {
		fprintf(stderr, "Failed to import sparse file\n");
		exit(-1);
	}

	files = sparse_file_resparse(s, max_size, NULL, 0);
	if (files < 0) {
		fprintf(stderr, "Failed to resparse\n");
		exit(-1);
	}

	out_s = calloc(sizeof(struct sparse_file *), files);
	if (!out_s) {
		fprintf(stderr, "Failed to allocate sparse file array\n");
		exit(-1);
	}

	files = sparse_file_resparse(s, max_size, out_s, files);
	if (files < 0) {
		fprintf(stderr, "Failed to resparse\n");
		exit(-1);
	}

	for (i = 0; i < files; i++) {
		ret = snprintf(filename, sizeof(filename), "%s.%d", argv[2], i);
		if (ret >= (int)sizeof(filename)) {
			fprintf(stderr, "Filename too long\n");
			exit(-1);
		}

		out = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
		if (out < 0) {
			fprintf(stderr, "Cannot open output file %s\n", argv[2]);
			exit(-1);
		}

		ret = sparse_file_write(out_s[i], out, false, true, false);
		if (ret) {
			fprintf(stderr, "Failed to write sparse file\n");
			exit(-1);
		}
		close(out);
	}

	close(in);

	exit(0);
}