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Use memset/memcpy functions for RLE chunk decoding 

Reduces time spent in `decode_chunk_rle` by 4-5x.
This commit is contained in:
Michał Janiszewski 2016-05-14 11:08:54 +02:00
parent f62932a5d3
commit 9cd762b1a6
1 changed files with 7 additions and 6 deletions
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13
src/util/sawyercoding.c
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@ -293,21 +293,22 @@ int sawyercoding_validate_track_checksum(const uint8* src, size_t length){
*/
static size_t decode_chunk_rle(const uint8* src_buffer, uint8* dst_buffer, size_t length)
{
size_t i, j, count;
size_t count;
uint8 *dst, rleCodeByte;
dst = dst_buffer;
for (i = 0; i < length; i++) {
for (int i = 0; i < length; i++) {
rleCodeByte = src_buffer[i];
if (rleCodeByte & 128) {
i++;
count = 257 - rleCodeByte;
for (j = 0; j < count; j++)
*dst++ = src_buffer[i];
memset(dst, src_buffer[i], count);
dst = (uint8*)((uintptr_t)dst + count);
} else {
for (j = 0; j <= rleCodeByte; j++)
*dst++ = src_buffer[++i];
memcpy(dst, src_buffer + i + 1, rleCodeByte + 1);
dst = (uint8*)((uintptr_t)dst + rleCodeByte + 1);
i += rleCodeByte + 1;
}
}