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Fixed an endianproblem

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This commit is contained in:
Thomas Balling Sørensen 2010-08-04 11:07:26 +02:00
parent 966b836e2d
commit 09a10be4db
1 changed files with 44 additions and 3 deletions
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47
src/gallium/auxiliary/vl/vl_bitstream_parser.c
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@ -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