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util/cbfstool: Add "truncate" command

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It does the opposite to "expand", removing a trailing empty file from
CBFS. It also returns the size of the CBFS post processing on stdout.

BUG=b:65853903
BRANCH=none
TEST=`cbfstool test.bin truncate -r FW_MAIN_A` removes the trailing
empty file in FW_MAIN_A. Without a trailing empty file, the region is
left alone (tested using COREBOOT which comes with a master header
pointer).

Change-Id: I0c747090813898539f3428936afa9d8459adee9c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/21608
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Georgi
2017-09-20 11:59:18 +02:00
parent d6c0af6c54
commit 12631a4d1d
3 changed files with 63 additions and 0 deletions
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5
util/cbfstool/cbfs_image.h
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@@ -84,6 +84,11 @@ int cbfs_compact_instance(struct cbfs_image *image);
Returns 0 on success, otherwise non-zero. */
int cbfs_expand_to_region(struct buffer *region);
/* Truncate a CBFS by removing a trailing "empty" file if it exists.
Returns 0 on success, otherwise non-zero and passes the CBFS' remaining
size in the size argument. */
int cbfs_truncate_space(struct buffer *region, uint32_t *size);
/* Releases the CBFS image. Returns 0 on success, otherwise non-zero. */
int cbfs_image_delete(struct cbfs_image *image);