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| author | Martin Storsjö <martin@martin.st> | 2016-08-01 09:07:48 +0300 |
|---|---|---|
| committer | Martin Storsjö <martin@martin.st> | 2016-08-02 11:32:35 +0300 |
| commit | 230b1c070baa3b6d4bd590426a365b843d60ff50 (patch) | |
| tree | b4303ae76f1200b806bf248f0d417683db7be2fc /libavutil | |
| parent | 014773b66bdff4de24f384066d1a85d2a5bb6774 (diff) | |
| download | ffmpeg-230b1c070baa3b6d4bd590426a365b843d60ff50.tar.gz | |
intreadwrite: Add intermediate variables in the byteswise AV_W*() macros
This avoids issues with expanding the argument multiple times,
and makes sure that it is of the right type for the following shifts.
Even if the caller of a macro could be expected not to pass parameters
that have side effects if expanded multiple times, these fallback
codepaths are rarely, if ever, tested, so it is expected that such
issues can arise.
Thefore, for safety, make sure the fallback codepaths only expand
the arguments once.
Signed-off-by: Martin Storsjö <martin@martin.st>
Diffstat (limited to 'libavutil')
| -rw-r--r-- | libavutil/intreadwrite.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h index cdf1ef47ec..5f65957ce5 100644 --- a/libavutil/intreadwrite.h +++ b/libavutil/intreadwrite.h @@ -210,7 +210,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; ((const uint8_t*)(x))[1]) #endif #ifndef AV_WB16 -# define AV_WB16(p, d) do { \ +# define AV_WB16(p, val) do { \ + uint16_t d = val; \ ((uint8_t*)(p))[1] = (d); \ ((uint8_t*)(p))[0] = (d)>>8; \ } while(0) @@ -222,7 +223,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; ((const uint8_t*)(x))[0]) #endif #ifndef AV_WL16 -# define AV_WL16(p, d) do { \ +# define AV_WL16(p, val) do { \ + uint16_t d = val; \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ } while(0) @@ -236,7 +238,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; ((const uint8_t*)(x))[3]) #endif #ifndef AV_WB32 -# define AV_WB32(p, d) do { \ +# define AV_WB32(p, val) do { \ + uint32_t d = val; \ ((uint8_t*)(p))[3] = (d); \ ((uint8_t*)(p))[2] = (d)>>8; \ ((uint8_t*)(p))[1] = (d)>>16; \ @@ -252,7 +255,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; ((const uint8_t*)(x))[0]) #endif #ifndef AV_WL32 -# define AV_WL32(p, d) do { \ +# define AV_WL32(p, val) do { \ + uint32_t d = val; \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ @@ -272,7 +276,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; (uint64_t)((const uint8_t*)(x))[7]) #endif #ifndef AV_WB64 -# define AV_WB64(p, d) do { \ +# define AV_WB64(p, val) do { \ + uint64_t d = val; \ ((uint8_t*)(p))[7] = (d); \ ((uint8_t*)(p))[6] = (d)>>8; \ ((uint8_t*)(p))[5] = (d)>>16; \ @@ -296,7 +301,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; (uint64_t)((const uint8_t*)(x))[0]) #endif #ifndef AV_WL64 -# define AV_WL64(p, d) do { \ +# define AV_WL64(p, val) do { \ + uint64_t d = val; \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ |