ethtrie/slice.go


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package ethtrie

import (
    "bytes"
    "math"
)

// Helper function for comparing slices
func CompareIntSlice(a, b []int) bool {
    if len(a) != len(b) {
        return false
    }
    for i, v := range a {
        if v != b[i] {
            return false
        }
    }
    return true
}

// Returns the amount of nibbles that match each other from 0 ...
func MatchingNibbleLength(a, b []byte) int {
    var i, length = 0, int(math.Min(float64(len(a)), float64(len(b))))

    for i < length {
        if a[i] != b[i] {
            break
        }
        i++
    }

    return i
}

func HasTerm(s []byte) bool {
    return s[len(s)-1] == 16
}

func RemTerm(s []byte) []byte {
    if HasTerm(s) {
        return s[:len(s)-1]
    }

    return s
}

func BeginsWith(a, b []byte) bool {
    if len(b) > len(a) {
        return false
    }

    return bytes.Equal(a[:len(b)], b)
}