diff options
Diffstat (limited to 'src/gallium/auxiliary/vl/vl_bitstream_parser.c')
| -rw-r--r-- | src/gallium/auxiliary/vl/vl_bitstream_parser.c | 47 |
1 files changed, 44 insertions, 3 deletions
diff --git a/src/gallium/auxiliary/vl/vl_bitstream_parser.c b/src/gallium/auxiliary/vl/vl_bitstream_parser.c index 3193ea5f41c..f07b3443b92 100644 --- a/src/gallium/auxiliary/vl/vl_bitstream_parser.c +++ b/src/gallium/auxiliary/vl/vl_bitstream_parser.c @@ -29,17 +29,58 @@ #include <assert.h> #include <limits.h> #include <util/u_memory.h> +#include <stdio.h> + +inline void endian_swap_ushort(unsigned short *x) +{ + x[0] = (x[0]>>8) | + (x[0]<<8); +} + +inline void endian_swap_uint(unsigned int *x) +{ + x[0] = (x[0]>>24) | + ((x[0]<<8) & 0x00FF0000) | + ((x[0]>>8) & 0x0000FF00) | + (x[0]<<24); +} + +inline void endian_swap_ulonglong(unsigned long long *x) +{ + x[0] = (x[0]>>56) | + ((x[0]<<40) & 0x00FF000000000000) | + ((x[0]<<24) & 0x0000FF0000000000) | + ((x[0]<<8) & 0x000000FF00000000) | + ((x[0]>>8) & 0x00000000FF000000) | + ((x[0]>>24) & 0x0000000000FF0000) | + ((x[0]>>40) & 0x000000000000FF00) | + (x[0]<<56); +} static unsigned grab_bits(unsigned cursor, unsigned how_many_bits, unsigned bitstream_elt) { - unsigned excess_bits = sizeof(unsigned) * CHAR_BIT - how_many_bits - cursor; + unsigned excess_bits = sizeof(unsigned) * CHAR_BIT - how_many_bits; assert(cursor < sizeof(unsigned) * CHAR_BIT); assert(how_many_bits > 0 && how_many_bits <= sizeof(unsigned) * CHAR_BIT); assert(cursor + how_many_bits <= sizeof(unsigned) * CHAR_BIT); - - return (bitstream_elt << excess_bits) >> (excess_bits + cursor); + + #ifndef PIPE_ARCH_BIG_ENDIAN + switch (sizeof(unsigned)) { + case 2: + endian_swap_ushort(&bitstream_elt); + break; + case 4: + endian_swap_uint(&bitstream_elt); + break; + case 8: + endian_swap_ulonglong(&bitstream_elt); + break; + } + #endif // !PIPE_ARCH_BIG_ENDIAN + + return (bitstream_elt << cursor) >> (excess_bits); } static unsigned |