6 /* crc32.c -- compute the CRC-32 of a data stream
17 #include <u-boot/crc.h>
36   Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
44   byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
55   The table is simply the CRC of all possible eight bit values.  This is all
56   the information needed to generate CRC's on data a byte at a time for all
57   combinations of CRC register values and incoming bytes.
64   /* terms of polynomial defining this crc (except x^32): */  in make_crc_table()
83  * Table of CRC-32's of all single-byte values (made by make_crc_table)
169 #  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
171 #  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
177  * don't use ones compliment in their CRC calculations.
179 uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)  in crc32_no_comp()  argument
188     crc = cpu_to_le32(crc);  in crc32_no_comp()
202 	 crc ^= *++b; /* use pre increment for speed */  in crc32_no_comp()
217     return le32_to_cpu(crc);  in crc32_no_comp()
221 uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *p, uInt len)  in crc32()  argument
223      return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;  in crc32()
230 uint32_t ZEXPORT crc32_wd (uint32_t crc,  in crc32_wd()  argument
244 		crc = crc32 (crc, curr, chunk);  in crc32_wd()
249 	crc = crc32 (crc, buf, len);  in crc32_wd()
252 	return crc;  in crc32_wd()
258 	uint32_t crc;  in crc32_wd_buf()  local
260 	crc = crc32_wd(0, input, ilen, chunk_sz);  in crc32_wd_buf()
261 	crc = htonl(crc);  in crc32_wd_buf()
262 	memcpy(output, &crc, sizeof(crc));  in crc32_wd_buf()