1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23
24 #include "cutils/log.h"
25 #include "mtdutils.h"
26
27 #define LOG_TAG "flash_image"
28
29 #define HEADER_SIZE 2048 // size of header to compare for equality
30
die(const char * msg,...)31 void die(const char *msg, ...) {
32 int err = errno;
33 va_list args;
34 va_start(args, msg);
35 char buf[1024];
36 vsnprintf(buf, sizeof(buf), msg, args);
37 va_end(args);
38
39 if (err != 0) {
40 strlcat(buf, ": ", sizeof(buf));
41 strlcat(buf, strerror(err), sizeof(buf));
42 }
43
44 fprintf(stderr, "%s\n", buf);
45 ALOGE("%s\n", buf);
46 exit(1);
47 }
48
49 /* Read an image file and write it to a flash partition. */
50
main(int argc,char ** argv)51 int main(int argc, char **argv) {
52 const MtdPartition *ptn;
53 MtdWriteContext *write;
54 void *data;
55 unsigned sz;
56
57 if (argc != 3) {
58 fprintf(stderr, "usage: %s partition file.img\n", argv[0]);
59 return 2;
60 }
61
62 if (mtd_scan_partitions() <= 0) die("error scanning partitions");
63 const MtdPartition *partition = mtd_find_partition_by_name(argv[1]);
64 if (partition == NULL) die("can't find %s partition", argv[1]);
65
66 // If the first part of the file matches the partition, skip writing
67
68 int fd = open(argv[2], O_RDONLY);
69 if (fd < 0) die("error opening %s", argv[2]);
70
71 char header[HEADER_SIZE];
72 int headerlen = read(fd, header, sizeof(header));
73 if (headerlen <= 0) die("error reading %s header", argv[2]);
74
75 MtdReadContext *in = mtd_read_partition(partition);
76 if (in == NULL) {
77 ALOGW("error opening %s: %s\n", argv[1], strerror(errno));
78 // just assume it needs re-writing
79 } else {
80 char check[HEADER_SIZE];
81 int checklen = mtd_read_data(in, check, sizeof(check));
82 if (checklen <= 0) {
83 ALOGW("error reading %s: %s\n", argv[1], strerror(errno));
84 // just assume it needs re-writing
85 } else if (checklen == headerlen && !memcmp(header, check, headerlen)) {
86 ALOGI("header is the same, not flashing %s\n", argv[1]);
87 return 0;
88 }
89 mtd_read_close(in);
90 }
91
92 // Skip the header (we'll come back to it), write everything else
93 ALOGI("flashing %s from %s\n", argv[1], argv[2]);
94
95 MtdWriteContext *out = mtd_write_partition(partition);
96 if (out == NULL) die("error writing %s", argv[1]);
97
98 char buf[HEADER_SIZE];
99 memset(buf, 0, headerlen);
100 int wrote = mtd_write_data(out, buf, headerlen);
101 if (wrote != headerlen) die("error writing %s", argv[1]);
102
103 int len;
104 while ((len = read(fd, buf, sizeof(buf))) > 0) {
105 wrote = mtd_write_data(out, buf, len);
106 if (wrote != len) die("error writing %s", argv[1]);
107 }
108 if (len < 0) die("error reading %s", argv[2]);
109
110 if (mtd_write_close(out)) die("error closing %s", argv[1]);
111
112 // Now come back and write the header last
113
114 out = mtd_write_partition(partition);
115 if (out == NULL) die("error re-opening %s", argv[1]);
116
117 wrote = mtd_write_data(out, header, headerlen);
118 if (wrote != headerlen) die("error re-writing %s", argv[1]);
119
120 // Need to write a complete block, so write the rest of the first block
121 size_t block_size;
122 if (mtd_partition_info(partition, NULL, &block_size, NULL))
123 die("error getting %s block size", argv[1]);
124
125 if (lseek(fd, headerlen, SEEK_SET) != headerlen)
126 die("error rewinding %s", argv[2]);
127
128 int left = block_size - headerlen;
129 while (left < 0) left += block_size;
130 while (left > 0) {
131 len = read(fd, buf, left > (int)sizeof(buf) ? (int)sizeof(buf) : left);
132 if (len <= 0) die("error reading %s", argv[2]);
133 if (mtd_write_data(out, buf, len) != len)
134 die("error writing %s", argv[1]);
135 left -= len;
136 }
137
138 if (mtd_write_close(out)) die("error closing %s", argv[1]);
139 return 0;
140 }
141