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Add dumpimage, a tool to extract data from U-Boot images

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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>
This commit is contained in:
Guilherme Maciel Ferreira
2013-12-01 12:43:11 -07:00
committed by Tom Rini
parent f86ed6a8d5
commit a804b5ce2d
8 changed files with 444 additions and 0 deletions
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12
tools/imagetool.h
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@@ -34,7 +34,9 @@ struct image_tool_params {
int dflag;
int eflag;
int fflag;
int iflag;
int lflag;
int pflag;
int vflag;
int xflag;
int skipcpy;
@@ -50,6 +52,7 @@ struct image_tool_params {
char *datafile;
char *imagefile;
char *cmdname;
const char *outfile; /* Output filename */
const char *keydir; /* Directory holding private keys */
const char *keydest; /* Destination .dtb for public key */
const char *comment; /* Comment to add to signature node */
@@ -96,6 +99,15 @@ struct image_type_params {
*/
void (*set_header) (void *, struct stat *, int,
struct image_tool_params *);
/*
* This function is used by the command to retrieve a data file from
* the image (i.e. dumpimage -i <image> -p <position> <data_file>).
* Thus the code to extract a file from an image must be put here.
*
* Returns 0 if the file was successfully retrieved from the image,
* or a negative value on error.
*/
int (*extract_datafile) (void *, struct image_tool_params *);
/*
* Some image generation support for ex (default image type) supports
* more than one type_ids, this callback function is used to check