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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 _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include "ext4_utils.h"
#include "output_file.h"
#include "sparse_format.h"
#include "sparse_crc32.h"
#if defined(__APPLE__) && defined(__MACH__)
#define lseek64 lseek
#define off64_t off_t
#endif
#define COPY_BUF_SIZE (1024*1024)
u8 *copybuf;
/* This will be malloc'ed with the size of blk_sz from the sparse file header */
u8* zerobuf;
#define SPARSE_HEADER_MAJOR_VER 1
#define SPARSE_HEADER_LEN (sizeof(sparse_header_t))
#define CHUNK_HEADER_LEN (sizeof(chunk_header_t))
void usage()
{
fprintf(stderr, "Usage: simg2img <sparse_image_file> <raw_image_file>\n");
}
int process_raw_chunk(FILE *in, FILE *out, u32 blocks, u32 blk_sz, u32 *crc32)
{
u64 len = (u64)blocks * blk_sz;
int chunk;
while (len) {
chunk = (len > COPY_BUF_SIZE) ? COPY_BUF_SIZE : len;
if (fread(copybuf, chunk, 1, in) != 1) {
fprintf(stderr, "fread returned an error copying a raw chunk\n");
exit(-1);
}
*crc32 = sparse_crc32(*crc32, copybuf, chunk);
if (fwrite(copybuf, chunk, 1, out) != 1) {
fprintf(stderr, "fwrite returned an error copying a raw chunk\n");
exit(-1);
}
len -= chunk;
}
return blocks;
}
int process_skip_chunk(FILE *out, u32 blocks, u32 blk_sz, u32 *crc32)
{
/* len needs to be 64 bits, as the sparse file specifies the skip amount
* as a 32 bit value of blocks.
*/
u64 len = (u64)blocks * blk_sz;
u64 len_save;
u32 skip_chunk;
/* Fseek takes the offset as a long, which may be 32 bits on some systems.
* So, lets do a sequence of fseeks() with SEEK_CUR to get the file pointer
* where we want it.
*/
len_save = len;
while (len) {
skip_chunk = (len > 0x80000000) ? 0x80000000 : len;
fseek(out, skip_chunk, SEEK_CUR);
len -= skip_chunk;
}
/* And compute the CRC of the skipped region a chunk at a time */
len = len_save;
while (len) {
skip_chunk = (skip_chunk > blk_sz) ? blk_sz : skip_chunk;
*crc32 = sparse_crc32(*crc32, zerobuf, skip_chunk);
len -= skip_chunk;
}
return blocks;
}
int main(int argc, char *argv[])
{
FILE *in, *out;
unsigned int i;
sparse_header_t sparse_header;
chunk_header_t chunk_header;
u32 crc32 = 0;
u32 total_blocks = 0;
if (argc != 3) {
usage();
exit(-1);
}
if ( (copybuf = malloc(COPY_BUF_SIZE)) == 0) {
fprintf(stderr, "Cannot malloc copy buf\n");
exit(-1);
}
if ((in = fopen(argv[1], "rb")) == 0) {
fprintf(stderr, "Cannot open input file %s\n", argv[1]);
exit(-1);
}
if ((out = fopen(argv[2], "wb")) == 0) {
fprintf(stderr, "Cannot open output file %s\n", argv[2]);
exit(-1);
}
if (fread(&sparse_header, sizeof(sparse_header), 1, in) != 1) {
fprintf(stderr, "Error reading sparse file header\n");
exit(-1);
}
if (sparse_header.magic != SPARSE_HEADER_MAGIC) {
fprintf(stderr, "Bad magic\n");
exit(-1);
}
if (sparse_header.major_version != SPARSE_HEADER_MAJOR_VER) {
fprintf(stderr, "Unknown major version number\n");
exit(-1);
}
if (sparse_header.file_hdr_sz > SPARSE_HEADER_LEN) {
/* Skip the remaining bytes in a header that is longer than
* we expected.
*/
fseek(in, sparse_header.file_hdr_sz - SPARSE_HEADER_LEN, SEEK_CUR);
}
if ( (zerobuf = malloc(sparse_header.blk_sz)) == 0) {
fprintf(stderr, "Cannot malloc zero buf\n");
exit(-1);
}
for (i=0; i<sparse_header.total_chunks; i++) {
if (fread(&chunk_header, sizeof(chunk_header), 1, in) != 1) {
fprintf(stderr, "Error reading chunk header\n");
exit(-1);
}
if (sparse_header.chunk_hdr_sz > CHUNK_HEADER_LEN) {
/* Skip the remaining bytes in a header that is longer than
* we expected.
*/
fseek(in, sparse_header.chunk_hdr_sz - CHUNK_HEADER_LEN, SEEK_CUR);
}
switch (chunk_header.chunk_type) {
case CHUNK_TYPE_RAW:
if (chunk_header.total_sz != (sparse_header.chunk_hdr_sz +
(chunk_header.chunk_sz * sparse_header.blk_sz)) ) {
fprintf(stderr, "Bogus chunk size for chunk %d, type Raw\n", i);
exit(-1);
}
total_blocks += process_raw_chunk(in, out,
chunk_header.chunk_sz, sparse_header.blk_sz, &crc32);
break;
case CHUNK_TYPE_DONT_CARE:
if (chunk_header.total_sz != sparse_header.chunk_hdr_sz) {
fprintf(stderr, "Bogus chunk size for chunk %d, type Dont Care\n", i);
exit(-1);
}
total_blocks += process_skip_chunk(out,
chunk_header.chunk_sz, sparse_header.blk_sz, &crc32);
break;
default:
fprintf(stderr, "Unknown chunk type 0x%4.4x\n", chunk_header.chunk_type);
exit(-1);
}
}
/* If the last chunk was a skip, then the code just did a seek, but
* no write, and the file won't actually be the correct size. This
* will make the file the correct size. Make sure the offset is
* computed in 64 bits, and the function called can handle 64 bits.
*/
if (ftruncate(fileno(out), (u64)total_blocks * sparse_header.blk_sz)) {
fprintf(stderr, "Error calling ftruncate() to set the image size\n");
exit(-1);
}
fclose(in);
fclose(out);
if (sparse_header.total_blks != total_blocks) {
fprintf(stderr, "Wrote %d blocks, expected to write %d blocks\n",
total_blocks, sparse_header.total_blks);
exit(-1);
}
if (sparse_header.image_checksum != crc32) {
fprintf(stderr, "computed crc32 of 0x%8.8x, expected 0x%8.8x\n",
crc32, sparse_header.image_checksum);
exit(-1);
}
exit(0);
}