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/*
* 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.
*/
#define _FILE_OFFSET_BITS 64
#define _LARGEFILE64_SOURCE 1
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <libgen.h>
#include <unistd.h>
#include <sparse/sparse.h>
#include "ext4_utils.h"
#include "make_ext4fs.h"
#include "allocate.h"
#if defined(__APPLE__) && defined(__MACH__)
#define off64_t off_t
#endif
#ifndef USE_MINGW /* O_BINARY is windows-specific flag */
#define O_BINARY 0
#endif
extern struct fs_info info;
static int verbose = 0;
static void usage(char *path)
{
fprintf(stderr, "%s [ options ] <image or block device> <output image>\n", path);
fprintf(stderr, "\n");
fprintf(stderr, " -c include CRC block\n");
fprintf(stderr, " -v verbose output\n");
fprintf(stderr, " -z gzip output\n");
fprintf(stderr, " -S don't use sparse output format\n");
}
static int build_sparse_ext(int fd, const char *filename)
{
unsigned int i;
unsigned int block;
int start_contiguous_block;
u8 *block_bitmap;
off64_t ret;
block_bitmap = malloc(info.block_size);
if (!block_bitmap)
critical_error("failed to allocate block bitmap");
if (aux_info.first_data_block > 0)
sparse_file_add_file(ext4_sparse_file, filename, 0,
info.block_size * aux_info.first_data_block, 0);
for (i = 0; i < aux_info.groups; i++) {
u32 first_block = aux_info.first_data_block + i * info.blocks_per_group;
u32 last_block = min(info.blocks_per_group, aux_info.len_blocks - first_block);
ret = lseek64(fd, (u64)info.block_size * aux_info.bg_desc[i].bg_block_bitmap,
SEEK_SET);
if (ret < 0)
critical_error_errno("failed to seek to block group bitmap %d", i);
ret = read(fd, block_bitmap, info.block_size);
if (ret < 0)
critical_error_errno("failed to read block group bitmap %d", i);
if (ret != (int)info.block_size)
critical_error("failed to read all of block group bitmap %d", i);
start_contiguous_block = -1;
for (block = 0; block < last_block; block++) {
if (start_contiguous_block >= 0) {
if (!bitmap_get_bit(block_bitmap, block)) {
u32 start_block = first_block + start_contiguous_block;
u32 len_blocks = block - start_contiguous_block;
sparse_file_add_file(ext4_sparse_file, filename,
(u64)info.block_size * start_block,
info.block_size * len_blocks, start_block);
start_contiguous_block = -1;
}
} else {
if (bitmap_get_bit(block_bitmap, block))
start_contiguous_block = block;
}
}
if (start_contiguous_block >= 0) {
u32 start_block = first_block + start_contiguous_block;
u32 len_blocks = last_block - start_contiguous_block;
sparse_file_add_file(ext4_sparse_file, filename,
(u64)info.block_size * start_block,
info.block_size * len_blocks, start_block);
}
}
return 0;
}
int main(int argc, char **argv)
{
int opt;
const char *in = NULL;
const char *out = NULL;
int gzip = 0;
int sparse = 1;
int infd, outfd;
int crc = 0;
while ((opt = getopt(argc, argv, "cvzS")) != -1) {
switch (opt) {
case 'c':
crc = 1;
break;
case 'v':
verbose = 1;
break;
case 'z':
gzip = 1;
break;
case 'S':
sparse = 0;
break;
}
}
if (optind >= argc) {
fprintf(stderr, "Expected image or block device after options\n");
usage(argv[0]);
exit(EXIT_FAILURE);
}
in = argv[optind++];
if (optind >= argc) {
fprintf(stderr, "Expected output image after input image\n");
usage(argv[0]);
exit(EXIT_FAILURE);
}
out = argv[optind++];
if (optind < argc) {
fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
usage(argv[0]);
exit(EXIT_FAILURE);
}
infd = open(in, O_RDONLY);
if (infd < 0)
critical_error_errno("failed to open input image");
read_ext(infd, verbose);
ext4_sparse_file = sparse_file_new(info.block_size, info.len);
build_sparse_ext(infd, in);
close(infd);
if (strcmp(out, "-")) {
outfd = open(out, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
if (outfd < 0) {
error_errno("open");
return EXIT_FAILURE;
}
} else {
outfd = STDOUT_FILENO;
}
write_ext4_image(outfd, gzip, sparse, crc);
close(outfd);
sparse_file_destroy(ext4_sparse_file);
return 0;
}
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