137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include "cutils/log.h"
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#include "mtdutils.h"
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#ifdef LOG_TAG
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#undef LOG_TAG
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#endif
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#define LOG_TAG "dump_image"
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#define BLOCK_SIZE 2048
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#define SPARE_SIZE (BLOCK_SIZE >> 5)
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static void die(const char *msg, ...) {
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int err = errno;
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va_list args;
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va_start(args, msg);
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char buf[1024];
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vsnprintf(buf, sizeof(buf), msg, args);
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va_end(args);
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if (err != 0) {
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strlcat(buf, ": ", sizeof(buf));
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strlcat(buf, strerror(err), sizeof(buf));
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}
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fprintf(stderr, "%s\n", buf);
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exit(1);
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}
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/* Read a flash partition and write it to an image file. */
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int main(int argc, char **argv)
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{
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ssize_t (*read_func) (MtdReadContext *, char *, size_t);
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MtdReadContext *in;
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const MtdPartition *partition;
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char buf[BLOCK_SIZE + SPARE_SIZE];
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size_t partition_size;
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size_t read_size;
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size_t total;
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int fd;
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int wrote;
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int len;
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if (argc != 3) {
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fprintf(stderr, "usage: %s partition file.img\n", argv[0]);
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return 2;
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}
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if (mtd_scan_partitions() <= 0)
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die("error scanning partitions");
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partition = mtd_find_partition_by_name(argv[1]);
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if (partition == NULL)
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die("can't find %s partition", argv[1]);
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if (mtd_partition_info(partition, &partition_size, NULL, NULL)) {
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die("can't get info of partition %s", argv[1]);
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}
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if (!strcmp(argv[2], "-")) {
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fd = fileno(stdout);
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} else {
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fd = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0666);
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}
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if (fd < 0)
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die("error opening %s", argv[2]);
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in = mtd_read_partition(partition);
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if (in == NULL) {
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close(fd);
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unlink(argv[2]);
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die("error opening %s: %s\n", argv[1], strerror(errno));
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}
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if (!strcmp(argv[1], "system") ||
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!strcmp(argv[1], "cache") ||
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!strcmp(argv[1], "userdata")) {
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read_size = BLOCK_SIZE + SPARE_SIZE;
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read_func = mtd_read_raw;
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} else {
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read_size = BLOCK_SIZE;
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read_func = mtd_read_data;
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}
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total = 0;
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while ((len = read_func(in, buf, read_size)) > 0) {
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wrote = write(fd, buf, len);
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if (wrote != len) {
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close(fd);
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unlink(argv[2]);
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die("error writing %s", argv[2]);
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}
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total += BLOCK_SIZE;
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}
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if (total != partition_size) {
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close(fd);
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unlink(argv[2]);
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die("error reading %s", argv[1]);
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}
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mtd_read_close(in);
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if (close(fd)) {
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unlink(argv[2]);
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die("error closing %s", argv[2]);
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}
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return 0;
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}
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