/*
* 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 "ext4_utils.h"
#include "sparse_format.h"
#include "sparse_crc32.h"
#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>
#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");
}
static int read_all(int fd, void *buf, size_t len)
{
size_t total = 0;
int ret;
char *ptr = buf;
while (total < len) {
ret = read(fd, ptr, len - total);
if (ret < 0)
return ret;
if (ret == 0)
return total;
ptr += ret;
total += ret;
}
return total;
}
static int write_all(int fd, void *buf, size_t len)
{
size_t total = 0;
int ret;
char *ptr = buf;
while (total < len) {
ret = write(fd, ptr, len - total);
if (ret < 0)
return ret;
if (ret == 0)
return total;
ptr += ret;
total += ret;
}
return total;
}
int process_raw_chunk(int in, int out, u32 blocks, u32 blk_sz, u32 *crc32)
{
u64 len = (u64)blocks * blk_sz;
int ret;
int chunk;
while (len) {
chunk = (len > COPY_BUF_SIZE) ? COPY_BUF_SIZE : len;
ret = read_all(in, copybuf, chunk);
if (ret != chunk) {
fprintf(stderr, "read returned an error copying a raw chunk: %d %d\n",
ret, chunk);
exit(-1);
}
*crc32 = sparse_crc32(*crc32, copybuf, chunk);
ret = write_all(out, copybuf, chunk);
if (ret != chunk) {
fprintf(stderr, "write returned an error copying a raw chunk\n");
exit(-1);
}
len -= chunk;
}
return blocks;
}
int process_fill_chunk(int in, int out, u32 blocks, u32 blk_sz, u32 *crc32)
{
u64 len = (u64)blocks * blk_sz;
int ret;
int chunk;
u32 fill_val;
u32 *fillbuf;
unsigned int i;
/* Fill copy_buf with the fill value */
ret = read_all(in, &fill_val, sizeof(fill_val));
fillbuf = (u32 *)copybuf;
for (i = 0; i < (COPY_BUF_SIZE / sizeof(fill_val)); i++) {
fillbuf[i] = fill_val;
}
while (len) {
chunk = (len > COPY_BUF_SIZE) ? COPY_BUF_SIZE : len;
*crc32 = sparse_crc32(*crc32, copybuf, chunk);
ret = write_all(out, copybuf, chunk);
if (ret != chunk) {
fprintf(stderr, "write returned an error copying a raw chunk\n");
exit(-1);
}
len -= chunk;
}
return blocks;
}
int process_skip_chunk(int 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;
lseek64(out, len, SEEK_CUR);
return blocks;
}
int process_crc32_chunk(int in, u32 crc32)
{
u32 file_crc32;
int ret;
ret = read_all(in, &file_crc32, 4);
if (ret != 4) {
fprintf(stderr, "read returned an error copying a crc32 chunk\n");
exit(-1);
}
if (file_crc32 != crc32) {
fprintf(stderr, "computed crc32 of 0x%8.8x, expected 0x%8.8x\n",
crc32, file_crc32);
exit(-1);
}
return 0;
}
int main(int argc, char *argv[])
{
int in;
int out;
unsigned int i;
sparse_header_t sparse_header;
chunk_header_t chunk_header;
u32 crc32 = 0;
u32 total_blocks = 0;
int ret;
if (argc != 3) {
usage();
exit(-1);
}
if ( (copybuf = malloc(COPY_BUF_SIZE)) == 0) {
fprintf(stderr, "Cannot malloc copy buf\n");
exit(-1);
}
if (strcmp(argv[1], "-") == 0) {
in = STDIN_FILENO;
} else {
if ((in = open(argv[1], O_RDONLY)) == 0) {
fprintf(stderr, "Cannot open input file %s\n", argv[1]);
exit(-1);
}
}
if (strcmp(argv[2], "-") == 0) {
out = STDOUT_FILENO;
} else {
if ((out = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666)) == 0) {
fprintf(stderr, "Cannot open output file %s\n", argv[2]);
exit(-1);
}
}
ret = read_all(in, &sparse_header, sizeof(sparse_header));
if (ret != sizeof(sparse_header)) {
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.
*/
lseek64(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++) {
ret = read_all(in, &chunk_header, sizeof(chunk_header));
if (ret != sizeof(chunk_header)) {
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.
*/
lseek64(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_FILL:
if (chunk_header.total_sz != (sparse_header.chunk_hdr_sz + sizeof(u32)) ) {
fprintf(stderr, "Bogus chunk size for chunk %d, type Fill\n", i);
exit(-1);
}
total_blocks += process_fill_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;
case CHUNK_TYPE_CRC32:
process_crc32_chunk(in, crc32);
break;
default:
fprintf(stderr, "Unknown chunk type 0x%4.4x\n", chunk_header.chunk_type);
}
}
/* 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 (ftruncate64(out, (u64)total_blocks * sparse_header.blk_sz)) {
fprintf(stderr, "Error calling ftruncate() to set the image size\n");
exit(-1);
}
close(in);
close(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);
}
exit(0);
}