simg2simg.c

/*
 * 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);
}