141 lines
4.4 KiB
C
141 lines
4.4 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 "cutils/log.h"
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#include "mtdutils.h"
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#define LOG_TAG "flash_image"
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#define HEADER_SIZE 2048 // size of header to compare for equality
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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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LOGE("%s\n", buf);
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exit(1);
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}
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/* Read an image file and write it to a flash partition. */
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int main(int argc, char **argv) {
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const MtdPartition *ptn;
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MtdWriteContext *write;
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void *data;
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unsigned sz;
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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) die("error scanning partitions");
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const MtdPartition *partition = mtd_find_partition_by_name(argv[1]);
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if (partition == NULL) die("can't find %s partition", argv[1]);
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// If the first part of the file matches the partition, skip writing
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int fd = open(argv[2], O_RDONLY);
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if (fd < 0) die("error opening %s", argv[2]);
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char header[HEADER_SIZE];
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int headerlen = read(fd, header, sizeof(header));
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if (headerlen <= 0) die("error reading %s header", argv[2]);
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MtdReadContext *in = mtd_read_partition(partition);
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if (in == NULL) {
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LOGW("error opening %s: %s\n", argv[1], strerror(errno));
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// just assume it needs re-writing
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} else {
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char check[HEADER_SIZE];
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int checklen = mtd_read_data(in, check, sizeof(check));
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if (checklen <= 0) {
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LOGW("error reading %s: %s\n", argv[1], strerror(errno));
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// just assume it needs re-writing
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} else if (checklen == headerlen && !memcmp(header, check, headerlen)) {
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LOGI("header is the same, not flashing %s\n", argv[1]);
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return 0;
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}
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mtd_read_close(in);
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}
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// Skip the header (we'll come back to it), write everything else
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LOGI("flashing %s from %s\n", argv[1], argv[2]);
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MtdWriteContext *out = mtd_write_partition(partition);
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if (out == NULL) die("error writing %s", argv[1]);
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char buf[HEADER_SIZE];
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memset(buf, 0, headerlen);
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int wrote = mtd_write_data(out, buf, headerlen);
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if (wrote != headerlen) die("error writing %s", argv[1]);
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int len;
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while ((len = read(fd, buf, sizeof(buf))) > 0) {
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wrote = mtd_write_data(out, buf, len);
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if (wrote != len) die("error writing %s", argv[1]);
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}
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if (len < 0) die("error reading %s", argv[2]);
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if (mtd_write_close(out)) die("error closing %s", argv[1]);
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// Now come back and write the header last
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out = mtd_write_partition(partition);
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if (out == NULL) die("error re-opening %s", argv[1]);
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wrote = mtd_write_data(out, header, headerlen);
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if (wrote != headerlen) die("error re-writing %s", argv[1]);
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// Need to write a complete block, so write the rest of the first block
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size_t block_size;
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if (mtd_partition_info(partition, NULL, &block_size, NULL))
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die("error getting %s block size", argv[1]);
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if (lseek(fd, headerlen, SEEK_SET) != headerlen)
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die("error rewinding %s", argv[2]);
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int left = block_size - headerlen;
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while (left < 0) left += block_size;
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while (left > 0) {
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len = read(fd, buf, left > (int)sizeof(buf) ? (int)sizeof(buf) : left);
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if (len <= 0) die("error reading %s", argv[2]);
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if (mtd_write_data(out, buf, len) != len)
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die("error writing %s", argv[1]);
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left -= len;
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}
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if (mtd_write_close(out)) die("error closing %s", argv[1]);
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return 0;
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}
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