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35 lines
599 B
Go
35 lines
599 B
Go
// Copyright 2019+ Klaus Post. All rights reserved.
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// License information can be found in the LICENSE file.
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package flate
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import (
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"math/bits"
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"github.com/klauspost/compress/internal/le"
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)
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// matchLen returns the maximum common prefix length of a and b.
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// a must be the shortest of the two.
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func matchLen(a, b []byte) (n int) {
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left := len(a)
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for left >= 8 {
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diff := le.Load64(a, n) ^ le.Load64(b, n)
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if diff != 0 {
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return n + bits.TrailingZeros64(diff)>>3
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}
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n += 8
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left -= 8
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}
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a = a[n:]
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b = b[n:]
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for i := range a {
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if a[i] != b[i] {
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break
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}
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n++
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}
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return n
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}
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