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authorGuilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>2013-12-01 12:43:11 -0700
committerTom Rini <trini@ti.com>2013-12-13 09:15:32 -0500
commita804b5ce2d84dca6f9e145003e588876adf2c71f (patch)
tree60342a722b9322a3672e7edd8d4ee260cbf44cf6 /tools/default_image.c
parentf86ed6a8d52c99bb2d17d3cac1647edca0c4399c (diff)
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Add dumpimage, a tool to extract data from U-Boot images
Given a multi-file image created through the mkimage's -d option: $ mkimage -A x86 -O linux -T multi -n x86 -d vmlinuz:initrd.img:System.map \ multi.img Image Name: x86 Created: Thu Jul 25 10:29:13 2013 Image Type: Intel x86 Linux Multi-File Image (gzip compressed) Data Size: 13722956 Bytes = 13401.32 kB = 13.09 MB Load Address: 00000000 Entry Point: 00000000 Contents: Image 0: 4040128 Bytes = 3945.44 kB = 3.85 MB Image 1: 7991719 Bytes = 7804.41 kB = 7.62 MB Image 2: 1691092 Bytes = 1651.46 kB = 1.61 MB It is possible to perform the innverse operation -- extracting any file from the image -- by using the dumpimage's -i option: $ dumpimage -i multi.img -p 2 System.map Although it's feasible to retrieve "data files" from image through scripting, the requirement to embed tools such 'dd', 'awk' and 'sed' for this sole purpose is cumbersome and unreliable -- once you must keep track of file sizes inside the image. Furthermore, extracting data files using "dumpimage" tool is faster than through scripting. Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com> Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'tools/default_image.c')
-rw-r--r--tools/default_image.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/tools/default_image.c b/tools/default_image.c
index cc790b2..0a0792e 100644
--- a/tools/default_image.c
+++ b/tools/default_image.c
@@ -117,6 +117,62 @@ static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
image_set_hcrc(hdr, checksum);
}
+static int image_save_datafile(struct image_tool_params *params,
+ ulong file_data, ulong file_len)
+{
+ int dfd;
+ const char *datafile = params->outfile;
+
+ dfd = open(datafile, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
+ S_IRUSR | S_IWUSR);
+ if (dfd < 0) {
+ fprintf(stderr, "%s: Can't open \"%s\": %s\n",
+ params->cmdname, datafile, strerror(errno));
+ return -1;
+ }
+
+ if (write(dfd, (void *)file_data, file_len) != (ssize_t)file_len) {
+ fprintf(stderr, "%s: Write error on \"%s\": %s\n",
+ params->cmdname, datafile, strerror(errno));
+ close(dfd);
+ return -1;
+ }
+
+ close(dfd);
+
+ return 0;
+}
+
+static int image_extract_datafile(void *ptr, struct image_tool_params *params)
+{
+ const image_header_t *hdr = (const image_header_t *)ptr;
+ ulong file_data;
+ ulong file_len;
+
+ if (image_check_type(hdr, IH_TYPE_MULTI)) {
+ ulong idx = params->pflag;
+ ulong count;
+
+ /* get the number of data files present in the image */
+ count = image_multi_count(hdr);
+
+ /* retrieve the "data file" at the idx position */
+ image_multi_getimg(hdr, idx, &file_data, &file_len);
+
+ if ((file_len == 0) || (idx >= count)) {
+ fprintf(stderr, "%s: No such data file %ld in \"%s\"\n",
+ params->cmdname, idx, params->imagefile);
+ return -1;
+ }
+ } else {
+ file_data = image_get_data(hdr);
+ file_len = image_get_size(hdr);
+ }
+
+ /* save the "data file" into the file system */
+ return image_save_datafile(params, file_data, file_len);
+}
+
/*
* Default image type parameters definition
*/
@@ -128,6 +184,7 @@ static struct image_type_params defimage_params = {
.verify_header = image_verify_header,
.print_header = image_print_contents,
.set_header = image_set_header,
+ .extract_datafile = image_extract_datafile,
.check_params = image_check_params,
};