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If HAVE_ZLIB is set, use zlib internal crc32.

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This commit is contained in:
Themaister 2012-03-25 22:19:36 +02:00
parent a0a27658bd
commit 0726204505
2 changed files with 17 additions and 5 deletions
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18
movie.c
View File

@ -22,8 +22,19 @@
#include "general.h"
#include "dynamic.h"
// CRC32 implementation taken from BSNES source :)
#ifdef HAVE_ZLIB
#include "console/szlib/zlib.h"
uint32_t crc32_calculate(const uint8_t *data, size_t length)
{
return crc32(0, data, length);
}
uint32_t crc32_adjust(uint32_t crc, uint8_t data)
{
return crc32(crc, &data, 1);
}
#else
// Zlib crc32.
static const uint32_t crc32_table[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
@ -75,13 +86,14 @@ uint32_t crc32_adjust(uint32_t crc32, uint8_t input)
return ((crc32 >> 8) & 0x00ffffff) ^ crc32_table[(crc32 ^ input) & 0xff];
}
uint32_t crc32_calculate(const uint8_t *data, unsigned length)
uint32_t crc32_calculate(const uint8_t *data, size_t length)
{
uint32_t crc32 = ~0;
for (unsigned i = 0; i < length; i++)
for (size_t i = 0; i < length; i++)
crc32 = crc32_adjust(crc32, data[i]);
return ~crc32;
}
#endif
struct bsv_movie
{

4
movie.h
View File

@ -48,8 +48,8 @@ void bsv_movie_frame_rewind(bsv_movie_t *handle);
void bsv_movie_free(bsv_movie_t *handle);
uint32_t crc32_calculate(const uint8_t *data, unsigned length);
uint32_t crc32_adjust(uint32_t crc32, uint8_t input);
uint32_t crc32_calculate(const uint8_t *data, size_t length);
uint32_t crc32_adjust(uint32_t crc, uint8_t data);
#endif