Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * pg_crc.c
       4             :  *    PostgreSQL CRC support
       5             :  *
       6             :  * See Ross Williams' excellent introduction
       7             :  * A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from
       8             :  * http://ross.net/crc/download/crc_v3.txt or several other net sites.
       9             :  *
      10             :  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
      11             :  * Portions Copyright (c) 1994, Regents of the University of California
      12             :  *
      13             :  *
      14             :  * IDENTIFICATION
      15             :  *    src/backend/utils/hash/pg_crc.c
      16             :  *
      17             :  *-------------------------------------------------------------------------
      18             :  */
      19             : 
      20             : #include "postgres.h"
      21             : 
      22             : #include "port/pg_crc32c.h"
      23             : #include "utils/fmgrprotos.h"
      24             : #include "utils/pg_crc.h"
      25             : #include "varatt.h"
      26             : 
      27             : /*
      28             :  * Lookup table for calculating CRC-32 using Sarwate's algorithm.
      29             :  *
      30             :  * This table is based on the polynomial
      31             :  *  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.
      32             :  * (This is the same polynomial used in Ethernet checksums, for instance.)
      33             :  * Using Williams' terms, this is the "normal", not "reflected" version.
      34             :  */
      35             : const uint32 pg_crc32_table[256] = {
      36             :     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
      37             :     0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
      38             :     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
      39             :     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
      40             :     0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
      41             :     0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
      42             :     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
      43             :     0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
      44             :     0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
      45             :     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
      46             :     0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
      47             :     0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
      48             :     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
      49             :     0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
      50             :     0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
      51             :     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
      52             :     0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
      53             :     0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
      54             :     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
      55             :     0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
      56             :     0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
      57             :     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
      58             :     0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
      59             :     0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
      60             :     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
      61             :     0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
      62             :     0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
      63             :     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
      64             :     0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
      65             :     0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
      66             :     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
      67             :     0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
      68             :     0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
      69             :     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
      70             :     0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
      71             :     0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
      72             :     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
      73             :     0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
      74             :     0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
      75             :     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
      76             :     0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
      77             :     0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
      78             :     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
      79             :     0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
      80             :     0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
      81             :     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
      82             :     0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
      83             :     0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
      84             :     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
      85             :     0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
      86             :     0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
      87             :     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
      88             :     0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
      89             :     0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
      90             :     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
      91             :     0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
      92             :     0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
      93             :     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
      94             :     0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
      95             :     0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
      96             :     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
      97             :     0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
      98             :     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
      99             :     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
     100             : };
     101             : 
     102             : /*
     103             :  * SQL-callable functions
     104             :  */
     105             : 
     106             : Datum
     107          12 : crc32_bytea(PG_FUNCTION_ARGS)
     108             : {
     109          12 :     bytea      *in = PG_GETARG_BYTEA_PP(0);
     110             :     pg_crc32    crc;
     111             : 
     112          12 :     INIT_TRADITIONAL_CRC32(crc);
     113         276 :     COMP_TRADITIONAL_CRC32(crc, VARDATA_ANY(in), VARSIZE_ANY_EXHDR(in));
     114          12 :     FIN_TRADITIONAL_CRC32(crc);
     115             : 
     116          12 :     PG_RETURN_INT64(crc);
     117             : }
     118             : 
     119             : Datum
     120          12 : crc32c_bytea(PG_FUNCTION_ARGS)
     121             : {
     122          12 :     bytea      *in = PG_GETARG_BYTEA_PP(0);
     123             :     pg_crc32c   crc;
     124             : 
     125          12 :     INIT_CRC32C(crc);
     126          12 :     COMP_CRC32C(crc, VARDATA_ANY(in), VARSIZE_ANY_EXHDR(in));
     127          12 :     FIN_CRC32C(crc);
     128             : 
     129          12 :     PG_RETURN_INT64(crc);
     130             : }