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- #include "xz_private.h"
- #ifndef STATIC_RW_DATA
- # define STATIC_RW_DATA static
- #endif
- STATIC_RW_DATA uint32_t xz_crc32_table[256];
- XZ_EXTERN void xz_crc32_init(void)
- {
- const uint32_t poly = 0xEDB88320;
- uint32_t i;
- uint32_t j;
- uint32_t r;
- for (i = 0; i < 256; ++i) {
- r = i;
- for (j = 0; j < 8; ++j)
- r = (r >> 1) ^ (poly & ~((r & 1) - 1));
- xz_crc32_table[i] = r;
- }
- return;
- }
- XZ_EXTERN uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
- {
- crc = ~crc;
- while (size != 0) {
- crc = xz_crc32_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
- --size;
- }
- return ~crc;
- }
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