/* Copyright (C) radare2 - 2007-2016 - pancake */ #include #include static bool crc_table_is_init = false; static ut32 crc_table[256]; R_API ut32 r_hash_crc32(const ut8 *buf, ut64 len) { ut32 crc = 0; ut8 tmp[sizeof (ut32)]; if (!crc_table_is_init) { ut32 i, j, h = 1; crc_table_is_init = true; crc_table[0] = 0; for (i = 128; i; i >>= 1) { h = (h >> 1) ^ ((h & 1) ? (int)0xedb88320 : 0); for (j = 0; j < 256; j += 2*i) crc_table[i+j] = crc_table[j] ^ h; } } crc ^= UT32_MAX; while (len--) { crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff]; } crc ^= UT32_MAX; // unswap endian r_write_le32 (tmp, crc); return r_read_le32 (tmp); }