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archive/zip: preallocate fileList size for Reader.Open 

When building the index of file entries for Reader.Open (when the Reader
is used as an io/fs.FS), reduce reallocations by pre-allocating the
count of entries based on the count of file entries.

Change-Id: I05048337cb5e752054b3e984a8a5ec5199c4589b
Reviewed-on: https://go-review.googlesource.com/c/go/+/655476
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Olivier Mengué 2025-03-06 19:44:22 +01:00 committed by Gopher Robot
parent fe9b292b11
commit 812a44ebd0
1 changed files with 3 additions and 0 deletions
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3
src/archive/zip/reader.go
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@ -804,6 +804,9 @@ func toValidName(name string) string {
func (r *Reader) initFileList() {
r.fileListOnce.Do(func() {
// Preallocate the minimum size of the index.
// We may also synthesize additional directory entries.
r.fileList = make([]fileListEntry, 0, len(r.File))
// files and knownDirs map from a file/directory name
// to an index into the r.fileList entry that we are
// building. They are used to mark duplicate entries.