1 ///////////////////////////////////////////////////////////////////////////////
3 /// \file crc32_small.c
4 /// \brief CRC32 calculation (size-optimized)
6 // Author: Lasse Collin
8 // This file has been put into the public domain.
9 // You can do whatever you want with this file.
11 ///////////////////////////////////////////////////////////////////////////////
16 uint32_t lzma_crc32_table[1][256];
22 static const uint32_t poly32 = UINT32_C(0xEDB88320);
24 for (size_t b = 0; b < 256; ++b) {
26 for (size_t i = 0; i < 8; ++i) {
28 r = (r >> 1) ^ poly32;
33 lzma_crc32_table[0][b] = r;
43 mythread_once(crc32_init);
48 extern LZMA_API(uint32_t)
49 lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc)
56 crc = lzma_crc32_table[0][*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);