github.com/whatap/golib@v0.0.22/util/hash/HashUtil.go (about)

     1  package hash
     2  
     3  var table = [...]int64{
     4  	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
     5  	0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb,
     6  	0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e,
     7  	0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75,
     8  	0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808,
     9  	0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
    10  	0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162,
    11  	0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49,
    12  	0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc,
    13  	0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3,
    14  	0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
    15  	0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d,
    16  	0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0,
    17  	0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767,
    18  	0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a,
    19  	0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
    20  	0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14,
    21  	0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b,
    22  	0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee,
    23  	0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5,
    24  	0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
    25  	0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d}
    26  
    27  func HashStr(str string) int32 {
    28  	return Hash([]byte(str))
    29  }
    30  
    31  func Hash(bytes []byte) int32 {
    32  	crc := uint32(0xffffffff)
    33  	sz := len(bytes)
    34  	for i := 0; i < sz; i++ {
    35  		b := bytes[i]
    36  		crc = crc>>8 ^ uint32(int32(table[uint8(crc^uint32(b))]))
    37  	}
    38  	crc = crc ^ 0xffffffff
    39  	return int32(crc)
    40  }
    41  
    42  func Hash64(bytes []byte) int64 {
    43  	crc := uint64(0xffffffffffffffff)
    44  	sz := len(bytes)
    45  	for i := 0; i < sz; i++ {
    46  		b := bytes[i]
    47  		crc = (crc)>>8 ^ uint64(int32(table[uint8(crc^uint64(b))]))
    48  	}
    49  	crc = crc ^ 0xffffffffffffffff
    50  	return int64(crc)
    51  }
    52  
    53  func Hash64Str(str string) int64 {
    54  	return Hash64([]byte(str))
    55  }
    56  
    57  func GetLongHash(s string) int64 {
    58  	if s == "" {
    59  		return 0
    60  	}
    61  	return Hash64v2([]byte(s))
    62  }
    63  func Hash64v2(bytes []byte) int64 {
    64  	if bytes == nil {
    65  		return 0
    66  	}
    67  	crc := uint64(0xffffffffffffffff)
    68  
    69  	sz := len(bytes)
    70  	for i := 0; i < sz; i++ {
    71  		b := bytes[i]
    72  		crc = crc >> 8
    73  		n1 := uint64(table[uint8(int32(crc)^int32(b))])
    74  		n2 := uint64(table[uint8(int32(crc>>32)^int32(b))])
    75  		crc = crc ^ (n1 & 0xffffffff)
    76  		crc = crc ^ (n2 << 32)
    77  	}
    78  	crc = crc ^ 0xffffffffffffffff
    79  	return int64(crc)
    80  }
    81  
    82  func HashAddr(src []byte) int64 {
    83  	switch len(src) {
    84  	case 4:
    85  		c := ToInt(src)
    86  		return int64(c) * int64(c)
    87  	case 8:
    88  		return ToLong(src)
    89  	default:
    90  		return int64(Hash(src))
    91  	}
    92  }
    93  
    94  func ToInt(buf []byte) int32 {
    95  	ch1 := int32(buf[0])
    96  	ch2 := int32(buf[1])
    97  	ch3 := int32(buf[2])
    98  	ch4 := int32(buf[3])
    99  	return int32((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0))
   100  }
   101  
   102  func ToLong(buf []byte) int64 {
   103  	v := (int64(buf[0]) << 56)
   104  	v += (int64(buf[1]) << 48)
   105  	v += (int64(buf[2]) << 40)
   106  	v += (int64(buf[3]) << 32)
   107  	v += (int64(buf[4]) << 24)
   108  	v += (int64(buf[5]) << 16)
   109  	v += (int64(buf[6]) << 8)
   110  	v += (int64(buf[7]) << 0)
   111  	return v
   112  }