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cfb_console: align fields in gzipped .bmp files

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.bmp files contain 32-bit integers aligned at offsets of +2, +6,
et cetera within the bmp_header structure (see include/bmp_layout.h).

Support for gzip-compressed .bmp files is present in the cfb_console
display subsystem by uncompressing them prior to use.

This patch forces the in-memory header to be aligned properly
for these compressed images by extracting them to a 2-byte
offset in the memory returned by malloc. Since malloc will always
return a 4-byte aligned value, this forces the .bmp header
fields to be naturally aligned on 4-byte addresses.

Refer to these files for more details:
	doc/README.displaying-bmps

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
This commit is contained in:
Eric Nelson 2014-03-08 07:55:52 -07:00 committed by Tom Rini
parent 73545f75b6
commit 5ca05c8b03
1 changed files with 6 additions and 2 deletions
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8
drivers/video/cfb_console.c
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@ -1473,7 +1473,11 @@ int video_display_bitmap(ulong bmp_image, int x, int y)
printf("Error: malloc in gunzip failed!\n");
return 1;
}
if (gunzip(dst, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE,
/*
* NB: we need to force offset of +2
* See doc/README.displaying-bmps
*/
if (gunzip(dst+2, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE-2,
(uchar *) bmp_image,
&len) != 0) {
printf("Error: no valid bmp or bmp.gz image at %lx\n",
@ -1489,7 +1493,7 @@ int video_display_bitmap(ulong bmp_image, int x, int y)
/*
* Set addr to decompressed image
*/
bmp = (bmp_image_t *) dst;
bmp = (bmp_image_t *)(dst+2);
if (!((bmp->header.signature[0] == 'B') &&
(bmp->header.signature[1] == 'M'))) {