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@ -186,17 +186,18 @@ headerLoop:
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// constant hextable to help quickly convert between 20byte and 40byte hashes
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const hextable = "0123456789abcdef"
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// To40ByteSHA converts a 20-byte SHA in a 40-byte slice into a 40-byte sha in place
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// without allocations. This is at least 100x quicker that hex.EncodeToString
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// NB This requires that sha is a 40-byte slice
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func To40ByteSHA(sha []byte) []byte {
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// To40ByteSHA converts a 20-byte SHA into a 40-byte sha. Input and output can be the
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// same 40 byte slice to support in place conversion without allocations.
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// This is at least 100x quicker that hex.EncodeToString
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// NB This requires that out is a 40-byte slice
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func To40ByteSHA(sha, out []byte) []byte {
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for i := 19; i >= 0; i-- {
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v := sha[i]
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vhi, vlo := v>>4, v&0x0f
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shi, slo := hextable[vhi], hextable[vlo]
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sha[i*2], sha[i*2+1] = shi, slo
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out[i*2], out[i*2+1] = shi, slo
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}
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return sha
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return out
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}
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// ParseTreeLineSkipMode reads an entry from a tree in a cat-file --batch stream
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