hardcoresushi/libgocryptfs
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contentenc: MergeBlocks: short-circuit the trivial case

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Saves 3% for the tar extract benchmark because we skip the allocation.
This commit is contained in:
Jakob Unterwurzacher 2017-07-02 16:07:20 +02:00
parent 52ab0462a4
commit b6bda01c33
1 changed files with 4 additions and 0 deletions
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4
internal/contentenc/content.go
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@ -277,6 +277,10 @@ func (be *ContentEnc) doEncryptBlock(plaintext []byte, blockNo uint64, fileID []
// MergeBlocks - Merge newData into oldData at offset // MergeBlocks - Merge newData into oldData at offset
// New block may be bigger than both newData and oldData // New block may be bigger than both newData and oldData
func (be *ContentEnc) MergeBlocks(oldData []byte, newData []byte, offset int) []byte { func (be *ContentEnc) MergeBlocks(oldData []byte, newData []byte, offset int) []byte {
// Fastpath for small-file creation
if len(oldData) == 0 && offset == 0 {
return newData
}
// Make block of maximum size // Make block of maximum size
out := make([]byte, be.plainBS) out := make([]byte, be.plainBS)