[FFmpeg-devel] [PATCH] add put_bits_long to avoid undefined behaviour in put_bits
Sat Aug 22 22:22:19 CEST 2009
the put_bits can be called with
unsigned int bit_buf = 0;
int bit_left = 32;
int n = 32;
unsigned int value = 0x1ba;
in the case of ALT_BITSTREAM_WRITER and BITSTREAM_WRITER_LE is not defined, we
will do "bit_buf<<=bit_left;"
But sizeof(bit_buf) == 32 and bit_left==32, and we are in a undefined
This patch add a put_bits_long for n = 32 and restrict n <= 31 for put_bits.
PS : this should fix fate for llvm
 C99 standard, ?6.5.7
If the value of the right operand is negative or is
greater than or equal to the width of the promoted
left operand, the behavior is undefined.
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