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Fix LFS commit finder not working (#15856)

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* Create a copy of the sha bytes.


Co-authored-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
KN4CK3R 2021-05-14 15:12:11 +02:00 • committed by GitHub
parent 1a5659943e
commit df72cf6211
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3 changed files with 12 additions and 9 deletions
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13
modules/git/batch_reader.go
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@ -186,17 +186,18 @@ headerLoop:
// constant hextable to help quickly convert between 20byte and 40byte hashes
const hextable = "0123456789abcdef"
// To40ByteSHA converts a 20-byte SHA in a 40-byte slice into a 40-byte sha in place
// without allocations. This is at least 100x quicker that hex.EncodeToString
// NB This requires that sha is a 40-byte slice
func To40ByteSHA(sha []byte) []byte {
// To40ByteSHA converts a 20-byte SHA into a 40-byte sha. Input and output can be the
// same 40 byte slice to support in place conversion without allocations.
// This is at least 100x quicker that hex.EncodeToString
// NB This requires that out is a 40-byte slice
func To40ByteSHA(sha, out []byte) []byte {
for i := 19; i >= 0; i-- {
v := sha[i]
vhi, vlo := v>>4, v&0x0f
shi, slo := hextable[vhi], hextable[vlo]
sha[i*2], sha[i*2+1] = shi, slo
out[i*2], out[i*2+1] = shi, slo
}
return sha
return out
}
// ParseTreeLineSkipMode reads an entry from a tree in a cat-file --batch stream