mirror of https://github.com/postgres/postgres
Now that we use CRC-32C in WAL and the control file, the "traditional" and "legacy" CRC-32 variants are not used in any frontend programs anymore. Move the code for those back from src/common to src/backend/utils/hash. Also move the slicing-by-8 implementation (back) to src/port. This is in preparation for next patch that will add another implementation that uses Intel SSE 4.2 instructions to calculate CRC-32C, where available.pull/14/head
Heikki Linnakangas
11 years ago
parent
d577bb868d
commit
4f700bcd20
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/*-------------------------------------------------------------------------
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* |
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* pg_crc.c |
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* PostgreSQL CRC support |
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* |
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* See Ross Williams' excellent introduction |
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* A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from |
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* http://www.ross.net/crc/download/crc_v3.txt or several other net sites.
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* |
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* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* |
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* IDENTIFICATION |
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* src/backend/utils/hash/pg_crc.c |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "c.h" |
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#include "utils/pg_crc.h" |
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/*
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* Lookup table for calculating CRC-32 using Sarwate's algorithm. |
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* |
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* This table is based on the polynomial |
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* x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1. |
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* (This is the same polynomial used in Ethernet checksums, for instance.) |
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* Using Williams' terms, this is the "normal", not "reflected" version. |
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*/ |
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const uint32 pg_crc32_table[256] = { |
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0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, |
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0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, |
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0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, |
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0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, |
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0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, |
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0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, |
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0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, |
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0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, |
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0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, |
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0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, |
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0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, |
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0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, |
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0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, |
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0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, |
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0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, |
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0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, |
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0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, |
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0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, |
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0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, |
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0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, |
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0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, |
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0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, |
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0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, |
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0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, |
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0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, |
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0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, |
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0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, |
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0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, |
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0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, |
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0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, |
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0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, |
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0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, |
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0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, |
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0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, |
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0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, |
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0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, |
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0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, |
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0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, |
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0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, |
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0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, |
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0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, |
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0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, |
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0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, |
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0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, |
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0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, |
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0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, |
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0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, |
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0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, |
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0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, |
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0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, |
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0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, |
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0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, |
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0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, |
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0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, |
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0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, |
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0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, |
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0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, |
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0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, |
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0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, |
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0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, |
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0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, |
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0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, |
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0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, |
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0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D |
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}; |
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@ -0,0 +1,49 @@ |
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/*-------------------------------------------------------------------------
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* |
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* pg_crc32c.h |
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* Routines for computing CRC-32C checksums. |
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* |
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* |
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* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* src/include/port/pg_crc32c.h |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef PG_CRC32C_H |
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#define PG_CRC32C_H |
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typedef uint32 pg_crc32c; |
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#define INIT_CRC32C(crc) ((crc) = 0xFFFFFFFF) |
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#define EQ_CRC32C(c1, c2) ((c1) == (c2)) |
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/*
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* Use slicing-by-8 algorithm. |
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* |
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* On big-endian systems, the intermediate value is kept in reverse byte |
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* order, to avoid byte-swapping during the calculation. FIN_CRC32C reverses |
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* the bytes to the final order. |
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*/ |
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#define COMP_CRC32C(crc, data, len) \ |
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((crc) = pg_comp_crc32c_sb8((crc), (data), (len))) |
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#ifdef WORDS_BIGENDIAN |
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#ifdef HAVE__BUILTIN_BSWAP32 |
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#define BSWAP32(x) __builtin_bswap32(x) |
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#else |
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#define BSWAP32(x) (((x << 24) & 0xff000000) | \ |
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((x << 8) & 0x00ff0000) | \
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((x >> 8) & 0x0000ff00) | \
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((x >> 24) & 0x000000ff)) |
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#endif |
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#define FIN_CRC32C(crc) ((crc) = BSWAP32(crc) ^ 0xFFFFFFFF) |
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#else |
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#define FIN_CRC32C(crc) ((crc) ^= 0xFFFFFFFF) |
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#endif |
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extern pg_crc32c pg_comp_crc32c_sb8(pg_crc32c crc, const void *data, size_t len); |
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#endif /* PG_CRC32C_H */ |
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