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authorJakob Unterwurzacher2017-07-02 16:07:20 +0200
committerJakob Unterwurzacher2017-07-02 16:23:24 +0200
commitb6bda01c33d27afa1df6bdc2dc9f3e352cc8d16d (patch)
tree40d36f4073c9f501f3ec7f79f00517f504f921a9 /internal/contentenc/content.go
parent52ab0462a42c22ccf07d0cc110590fc7db957182 (diff)
contentenc: MergeBlocks: short-circuit the trivial case
Saves 3% for the tar extract benchmark because we skip the allocation.
Diffstat (limited to 'internal/contentenc/content.go')
-rw-r--r--internal/contentenc/content.go4
1 files changed, 4 insertions, 0 deletions
diff --git a/internal/contentenc/content.go b/internal/contentenc/content.go
index 188b4e2..5d0ff49 100644
--- a/internal/contentenc/content.go
+++ b/internal/contentenc/content.go
@@ -277,6 +277,10 @@ func (be *ContentEnc) doEncryptBlock(plaintext []byte, blockNo uint64, fileID []
// MergeBlocks - Merge newData into oldData at offset
// New block may be bigger than both newData and oldData
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
out := make([]byte, be.plainBS)