首页 > 编程语言 > golang 将[]byte转成16进制的实现
2020
12-17

golang 将[]byte转成16进制的实现

将[]byte转成16进制

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import "crypto/md5"
import "fmt"
sign := md5.Sum([]byte("date string"))
signStr := fmt.Sprintf("%x", sign) //将[]byte转成16进制

补充：golang []byte存储存储的16进制转10进制

项目中有用[]byte存储16进制需要转到10进制，如果用系统自带的函数处理，需要先将[]byte通过hex.EncodeToString转为string，再用strconv.ParseInt转到10进制，过程中由于两次转换导致内存分配过多（每秒执行近100w次），GC出现错误导致进程挂掉。

自己写了一个函数来转，主要是避免出现内存泄漏：

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var b2m_map map[byte]uint64 = map[byte]uint64{
    0x00: 0,
    0x01: 1,
    0x02: 2,
    0x03: 3,
    0x04: 4,
    0x05: 5,
    0x06: 6,
    0x07: 7,
    0x08: 8,
    0x09: 9,
    0x0A: 10,
    0x0B: 11,
    0x0C: 12,
    0x0D: 13,
    0x0E: 14,
    0x0F: 15,
    0x10: 16,
    0x11: 17,
    0x12: 18,
    0x13: 19,
    0x14: 20,
    0x15: 21,
    0x16: 22,
    0x17: 23,
    0x18: 24,
    0x19: 25,
    0x1A: 26,
    0x1B: 27,
    0x1C: 28,
    0x1D: 29,
    0x1E: 30,
    0x1F: 31,
    0x20: 32,
    0x21: 33,
    0x22: 34,
    0x23: 35,
    0x24: 36,
    0x25: 37,
    0x26: 38,
    0x27: 39,
    0x28: 40,
    0x29: 41,
    0x2A: 42,
    0x2B: 43,
    0x2C: 44,
    0x2D: 45,
    0x2E: 46,
    0x2F: 47,
    0x30: 48,
    0x31: 49,
    0x32: 50,
    0x33: 51,
    0x34: 52,
    0x35: 53,
    0x36: 54,
    0x37: 55,
    0x38: 56,
    0x39: 57,
    0x3A: 58,
    0x3B: 59,
    0x3C: 60,
    0x3D: 61,
    0x3E: 62,
    0x3F: 63,
    0x40: 64,
    0x41: 65,
    0x42: 66,
    0x43: 67,
    0x44: 68,
    0x45: 69,
    0x46: 70,
    0x47: 71,
    0x48: 72,
    0x49: 73,
    0x4A: 74,
    0x4B: 75,
    0x4C: 76,
    0x4D: 77,
    0x4E: 78,
    0x4F: 79,
    0x50: 80,
    0x51: 81,
    0x52: 82,
    0x53: 83,
    0x54: 84,
    0x55: 85,
    0x56: 86,
    0x57: 87,
    0x58: 88,
    0x59: 89,
    0x5A: 90,
    0x5B: 91,
    0x5C: 92,
    0x5D: 93,
    0x5E: 94,
    0x5F: 95,
    0x60: 96,
    0x61: 97,
    0x62: 98,
    0x63: 99,
    0x64: 100,
    0x65: 101,
    0x66: 102,
    0x67: 103,
    0x68: 104,
    0x69: 105,
    0x6A: 106,
    0x6B: 107,
    0x6C: 108,
    0x6D: 109,
    0x6E: 110,
    0x6F: 111,
    0x70: 112,
    0x71: 113,
    0x72: 114,
    0x73: 115,
    0x74: 116,
    0x75: 117,
    0x76: 118,
    0x77: 119,
    0x78: 120,
    0x79: 121,
    0x7A: 122,
    0x7B: 123,
    0x7C: 124,
    0x7D: 125,
    0x7E: 126,
    0x7F: 127,
    0x80: 128,
    0x81: 129,
    0x82: 130,
    0x83: 131,
    0x84: 132,
    0x85: 133,
    0x86: 134,
    0x87: 135,
    0x88: 136,
    0x89: 137,
    0x8A: 138,
    0x8B: 139,
    0x8C: 140,
    0x8D: 141,
    0x8E: 142,
    0x8F: 143,
    0x90: 144,
    0x91: 145,
    0x92: 146,
    0x93: 147,
    0x94: 148,
    0x95: 149,
    0x96: 150,
    0x97: 151,
    0x98: 152,
    0x99: 153,
    0x9A: 154,
    0x9B: 155,
    0x9C: 156,
    0x9D: 157,
    0x9E: 158,
    0x9F: 159,
    0xA0: 160,
    0xA1: 161,
    0xA2: 162,
    0xA3: 163,
    0xA4: 164,
    0xA5: 165,
    0xA6: 166,
    0xA7: 167,
    0xA8: 168,
    0xA9: 169,
    0xAA: 170,
    0xAB: 171,
    0xAC: 172,
    0xAD: 173,
    0xAE: 174,
    0xAF: 175,
    0xB0: 176,
    0xB1: 177,
    0xB2: 178,
    0xB3: 179,
    0xB4: 180,
    0xB5: 181,
    0xB6: 182,
    0xB7: 183,
    0xB8: 184,
    0xB9: 185,
    0xBA: 186,
    0xBB: 187,
    0xBC: 188,
    0xBD: 189,
    0xBE: 190,
    0xBF: 191,
    0xC0: 192,
    0xC1: 193,
    0xC2: 194,
    0xC3: 195,
    0xC4: 196,
    0xC5: 197,
    0xC6: 198,
    0xC7: 199,
    0xC8: 200,
    0xC9: 201,
    0xCA: 202,
    0xCB: 203,
    0xCC: 204,
    0xCD: 205,
    0xCE: 206,
    0xCF: 207,
    0xD0: 208,
    0xD1: 209,
    0xD2: 210,
    0xD3: 211,
    0xD4: 212,
    0xD5: 213,
    0xD6: 214,
    0xD7: 215,
    0xD8: 216,
    0xD9: 217,
    0xDA: 218,
    0xDB: 219,
    0xDC: 220,
    0xDD: 221,
    0xDE: 222,
    0xDF: 223,
    0xE0: 224,
    0xE1: 225,
    0xE2: 226,
    0xE3: 227,
    0xE4: 228,
    0xE5: 229,
    0xE6: 230,
    0xE7: 231,
    0xE8: 232,
    0xE9: 233,
    0xEA: 234,
    0xEB: 235,
    0xEC: 236,
    0xED: 237,
    0xEE: 238,
    0xEF: 239,
    0xF0: 240,
    0xF1: 241,
    0xF2: 242,
    0xF3: 243,
    0xF4: 244,
    0xF5: 245,
    0xF6: 246,
    0xF7: 247,
    0xF8: 248,
    0xF9: 249,
    0xFA: 250,
    0xFB: 251,
    0xFC: 252,
    0xFD: 253,
    0xFE: 254,
    0xFF: 255,
}
func hex2int(hexB *[]byte) uint64 {
    var retInt uint64
    hexLen := len(*hexB)
    for k, v := range *hexB {
        retInt += b2m_map[v] * exponent(16, uint64(2*(hexLen-k-1)))
    }
    return retInt
}
func exponent(a, n uint64) uint64 {
    result := uint64(1)
    for i := n; i > 0; i >>= 1 {
        if i&1 != 0 {
            result *= a
        }
        a *= a
    }
    return result
}

经过测试，性能和自带的方法接近，略有提升。

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goos: windows
goarch: amd64
pkg: benchmark
Benchmark_General-4     10000000        144 ns/op
Benchmark_Better-4      10000000        128 ns/op
PASS
ok  benchmark   3.086s

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