diff options
Diffstat (limited to 'modules/git/batch_reader.go')
| -rw-r--r-- | modules/git/batch_reader.go | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/modules/git/batch_reader.go b/modules/git/batch_reader.go index 3d3a6916f5..d6ee0ce8e0 100644 --- a/modules/git/batch_reader.go +++ b/modules/git/batch_reader.go @@ -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 |