From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: picopng does not support big-endian CPUs
Date: Sun, 25 Jan 2015 22:26:29 +0400 [thread overview]
Message-ID: <20150125222629.c52501c7d776cabf4317c82f@gmail.com> (raw)
Hi All!
Current lib/gui/picopng.c has problems on big-endian CPUs.
Here are two examples from PNG_readPngHeader():
if (*(uint64_t *) in != PNG_SIGNATURE) {
...
if (*(uint32_t *) &in[12] != CHUNK_IHDR) {
Using memcmp in this situation is much better, e.g.
+ uint8_t png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
...
+ if (memcmp(in, png_signature, 8)) {
+ uint8_t chunk_header[4] = {0x49, 0x48, 0x44, 0x52};
...
+ if (memcmp(&in[12], chunk_header, 4)) {
Current lodepng works fine on big-endian, but can we disable picopng
in Kconfig for big-endian CPUs?
On mips I have CPU_BIG_ENDIAN option, so I can add
'depends on !CPU_BIG_ENDIAN' to lib/gui/Kconfig, e.g.
config PICOPNG
+ depends on !CPU_BIG_ENDIAN
bool "picoPNG"
--
Best regards,
Antony Pavlov
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next reply other threads:[~2015-01-25 18:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-25 18:26 Antony Pavlov [this message]
2015-01-26 7:58 ` Sascha Hauer
2015-01-26 9:06 ` Jean-Christophe PLAGNIOL-VILLARD
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