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use inline byte-swapping function for MSVC

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This commit is contained in:
Josh Coalson
2007-02-04 02:57:48 +00:00
parent 8640da31f7
commit c85056b3d5
2 changed files with 26 additions and 0 deletions
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13
src/libFLAC/bitreader.c
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@@ -66,8 +66,12 @@ typedef FLAC__uint32 brword;
#if WORDS_BIGENDIAN #if WORDS_BIGENDIAN
#define SWAP_BE_WORD_TO_HOST(x) (x) #define SWAP_BE_WORD_TO_HOST(x) (x)
#else #else
#ifdef _MSC_VER
#define SWAP_BE_WORD_TO_HOST(x) local_swap32_(x)
#else
#define SWAP_BE_WORD_TO_HOST(x) ntohl(x) #define SWAP_BE_WORD_TO_HOST(x) ntohl(x)
#endif #endif
#endif
/* counts the # of zero MSBs in a word */ /* counts the # of zero MSBs in a word */
#define ALIGNED_UNARY_BITS(word) ( \ #define ALIGNED_UNARY_BITS(word) ( \
(word) <= 0xffff ? \ (word) <= 0xffff ? \
@@ -147,6 +151,15 @@ struct FLAC__BitReader {
void *client_data; void *client_data;
}; };
#ifdef _MSC_VER
/* OPT: an MSVC built-in would be better */
static _inline FLAC__uint32 local_swap32_(FLAC__uint32 x)
{
x = ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
return (x>>16) | (x<<16);
}
#endif
static FLaC__INLINE void crc16_update_word_(FLAC__BitReader *br, brword word) static FLaC__INLINE void crc16_update_word_(FLAC__BitReader *br, brword word)
{ {
register unsigned crc = br->read_crc16; register unsigned crc = br->read_crc16;

13
src/libFLAC/bitwriter.c
View File

@@ -58,8 +58,12 @@ typedef FLAC__uint32 bwword;
#if WORDS_BIGENDIAN #if WORDS_BIGENDIAN
#define SWAP_BE_WORD_TO_HOST(x) (x) #define SWAP_BE_WORD_TO_HOST(x) (x)
#else #else
#ifdef _MSC_VER
#define SWAP_BE_WORD_TO_HOST(x) local_swap32_(x)
#else
#define SWAP_BE_WORD_TO_HOST(x) ntohl(x) #define SWAP_BE_WORD_TO_HOST(x) ntohl(x)
#endif #endif
#endif
/* /*
* The default capacity here doesn't matter too much. The buffer always grows * The default capacity here doesn't matter too much. The buffer always grows
@@ -98,6 +102,15 @@ struct FLAC__BitWriter {
unsigned bits; /* # of used bits in accum */ unsigned bits; /* # of used bits in accum */
}; };
#ifdef _MSC_VER
/* OPT: an MSVC built-in would be better */
static _inline FLAC__uint32 local_swap32_(FLAC__uint32 x)
{
x = ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
return (x>>16) | (x<<16);
}
#endif
/* * WATCHOUT: The current implementation only grows the buffer. */ /* * WATCHOUT: The current implementation only grows the buffer. */
static FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add) static FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add)
{ {