diff options
Diffstat (limited to 'src/include/utils/pg_crc.h')
| -rw-r--r-- | src/include/utils/pg_crc.h | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/src/include/utils/pg_crc.h b/src/include/utils/pg_crc.h index 375c405da5f..f43f4aad9dd 100644 --- a/src/include/utils/pg_crc.h +++ b/src/include/utils/pg_crc.h @@ -10,9 +10,6 @@ * We use a normal (not "reflected", in Williams' terms) CRC, using initial * all-ones register contents and a final bit inversion. * - * The 64-bit variant is not used as of PostgreSQL 8.1, but we retain the - * code for possible future use. - * * * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California @@ -56,97 +53,4 @@ do { \ /* Constant table for CRC calculation */ extern CRCDLLIMPORT const uint32 pg_crc32_table[]; - -#ifdef PROVIDE_64BIT_CRC - -/* - * If we use a 64-bit integer type, then a 64-bit CRC looks just like the - * usual sort of implementation. However, we can also fake it with two - * 32-bit registers. Experience has shown that the two-32-bit-registers code - * is as fast as, or even much faster than, the 64-bit code on all but true - * 64-bit machines. We use SIZEOF_VOID_P to check the native word width. - */ - -#if SIZEOF_VOID_P < 8 - -/* - * crc0 represents the LSBs of the 64-bit value, crc1 the MSBs. Note that - * with crc0 placed first, the output of 32-bit and 64-bit implementations - * will be bit-compatible only on little-endian architectures. If it were - * important to make the two possible implementations bit-compatible on - * all machines, we could do a configure test to decide how to order the - * two fields, but it seems not worth the trouble. - */ -typedef struct pg_crc64 -{ - uint32 crc0; - uint32 crc1; -} pg_crc64; - -/* Initialize a CRC accumulator */ -#define INIT_CRC64(crc) ((crc).crc0 = 0xffffffff, (crc).crc1 = 0xffffffff) - -/* Finish a CRC calculation */ -#define FIN_CRC64(crc) ((crc).crc0 ^= 0xffffffff, (crc).crc1 ^= 0xffffffff) - -/* Accumulate some (more) bytes into a CRC */ -#define COMP_CRC64(crc, data, len) \ -do { \ - uint32 __crc0 = (crc).crc0; \ - uint32 __crc1 = (crc).crc1; \ - unsigned char *__data = (unsigned char *) (data); \ - uint32 __len = (len); \ -\ - while (__len-- > 0) \ - { \ - int __tab_index = ((int) (__crc1 >> 24) ^ *__data++) & 0xFF; \ - __crc1 = pg_crc64_table1[__tab_index] ^ ((__crc1 << 8) | (__crc0 >> 24)); \ - __crc0 = pg_crc64_table0[__tab_index] ^ (__crc0 << 8); \ - } \ - (crc).crc0 = __crc0; \ - (crc).crc1 = __crc1; \ -} while (0) - -/* Check for equality of two CRCs */ -#define EQ_CRC64(c1,c2) ((c1).crc0 == (c2).crc0 && (c1).crc1 == (c2).crc1) - -/* Constant table for CRC calculation */ -extern CRCDLLIMPORT const uint32 pg_crc64_table0[]; -extern CRCDLLIMPORT const uint32 pg_crc64_table1[]; -#else /* use int64 implementation */ - -typedef struct pg_crc64 -{ - uint64 crc0; -} pg_crc64; - -/* Initialize a CRC accumulator */ -#define INIT_CRC64(crc) ((crc).crc0 = UINT64CONST(0xffffffffffffffff)) - -/* Finish a CRC calculation */ -#define FIN_CRC64(crc) ((crc).crc0 ^= UINT64CONST(0xffffffffffffffff)) - -/* Accumulate some (more) bytes into a CRC */ -#define COMP_CRC64(crc, data, len) \ -do { \ - uint64 __crc0 = (crc).crc0; \ - unsigned char *__data = (unsigned char *) (data); \ - uint32 __len = (len); \ -\ - while (__len-- > 0) \ - { \ - int __tab_index = ((int) (__crc0 >> 56) ^ *__data++) & 0xFF; \ - __crc0 = pg_crc64_table[__tab_index] ^ (__crc0 << 8); \ - } \ - (crc).crc0 = __crc0; \ -} while (0) - -/* Check for equality of two CRCs */ -#define EQ_CRC64(c1,c2) ((c1).crc0 == (c2).crc0) - -/* Constant table for CRC calculation */ -extern CRCDLLIMPORT const uint64 pg_crc64_table[]; -#endif /* SIZEOF_VOID_P < 8 */ -#endif /* PROVIDE_64BIT_CRC */ - #endif /* PG_CRC_H */ |