Update zip library to the latest commit from golang repo

zip/.git_revision

@@ -1 +1 @@
-f75aafdf56dd90eab75cfeac8cf69358f73ba171
+33d725e5758bf1fea62e6c77fc70b57a828a49f5

zip/register.go

@@ -8,7 +8,6 @@ import (
 	"compress/flate"
 	"errors"
 	"io"
-	"io/ioutil"
 	"sync"
 )
 
@@ -20,7 +19,7 @@ import (
 type Compressor func(w io.Writer) (io.WriteCloser, error)
 
 // A Decompressor returns a new decompressing reader, reading from r.
-// The ReadCloser's Close method must be used to release associated resources.
+// The [io.ReadCloser]'s Close method must be used to release associated resources.
 // The Decompressor itself must be safe to invoke from multiple goroutines
 // simultaneously, but each returned reader will be used only by
 // one goroutine at a time.
@@ -103,51 +102,46 @@ func (r *pooledFlateReader) Close() error {
 }
 
 var (
-	mu sync.RWMutex // guards compressor and decompressor maps
+	compressors   sync.Map // map[uint16]Compressor
+	decompressors sync.Map // map[uint16]Decompressor
+)
 
-	compressors = map[uint16]Compressor{
-		Store:   func(w io.Writer) (io.WriteCloser, error) { return &nopCloser{w}, nil },
-		Deflate: func(w io.Writer) (io.WriteCloser, error) { return newFlateWriter(w), nil },
-	}
+func init() {
+	compressors.Store(Store, Compressor(func(w io.Writer) (io.WriteCloser, error) { return &nopCloser{w}, nil }))
+	compressors.Store(Deflate, Compressor(func(w io.Writer) (io.WriteCloser, error) { return newFlateWriter(w), nil }))
 
-	decompressors = map[uint16]Decompressor{
-		Store:   ioutil.NopCloser,
-		Deflate: newFlateReader,
-	}
-)
+	decompressors.Store(Store, Decompressor(io.NopCloser))
+	decompressors.Store(Deflate, Decompressor(newFlateReader))
+}
 
 // RegisterDecompressor allows custom decompressors for a specified method ID.
-// The common methods Store and Deflate are built in.
+// The common methods [Store] and [Deflate] are built in.
 func RegisterDecompressor(method uint16, dcomp Decompressor) {
-	mu.Lock()
-	defer mu.Unlock()
-
-	if _, ok := decompressors[method]; ok {
+	if _, dup := decompressors.LoadOrStore(method, dcomp); dup {
 		panic("decompressor already registered")
 	}
-	decompressors[method] = dcomp
 }
 
 // RegisterCompressor registers custom compressors for a specified method ID.
-// The common methods Store and Deflate are built in.
+// The common methods [Store] and [Deflate] are built in.
 func RegisterCompressor(method uint16, comp Compressor) {
-	mu.Lock()
-	defer mu.Unlock()
-
-	if _, ok := compressors[method]; ok {
+	if _, dup := compressors.LoadOrStore(method, comp); dup {
 		panic("compressor already registered")
 	}
-	compressors[method] = comp
 }
 
 func compressor(method uint16) Compressor {
-	mu.RLock()
-	defer mu.RUnlock()
-	return compressors[method]
+	ci, ok := compressors.Load(method)
+	if !ok {
+		return nil
+	}
+	return ci.(Compressor)
 }
 
 func decompressor(method uint16) Decompressor {
-	mu.RLock()
-	defer mu.RUnlock()
-	return decompressors[method]
+	di, ok := decompressors.Load(method)
+	if !ok {
+		return nil
+	}
+	return di.(Decompressor)
 }