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22 lines
388 B
Go
22 lines
388 B
Go
package restic
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import "bytes"
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// ZeroPrefixLen returns the length of the longest all-zero prefix of p.
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func ZeroPrefixLen(p []byte) (n int) {
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// First skip 1kB-sized blocks, for speed.
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var zeros [1024]byte
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for len(p) >= len(zeros) && bytes.Equal(p[:len(zeros)], zeros[:]) {
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p = p[len(zeros):]
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n += len(zeros)
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}
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for len(p) > 0 && p[0] == 0 {
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p = p[1:]
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n++
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}
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return n
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}
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