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archive/zip: add documentation about compression methods

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Change-Id: I491c5ddd1a5d8e55f8e6bb9377bc3811e42773f8
Reviewed-on: https://go-review.googlesource.com/77870
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Joe Kyo 2017-11-15 10:24:21 +00:00 committed by Brad Fitzpatrick
parent c2eb9454a9
commit a8474c799f
2 changed files with 8 additions and 3 deletions
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10
src/archive/zip/struct.go
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@ -27,8 +27,8 @@ import (
// Compression methods. // Compression methods.
const ( const (
Store uint16 = 0 Store uint16 = 0 // no compression
Deflate uint16 = 8 Deflate uint16 = 8 // DEFLATE compressed
) )
const ( const (
@ -102,7 +102,9 @@ type FileHeader struct {
CreatorVersion uint16 CreatorVersion uint16
ReaderVersion uint16 ReaderVersion uint16
Flags uint16 Flags uint16
Method uint16
// Method is the compression method. If zero, Store is used.
Method uint16
// Modified is the modified time of the file. // Modified is the modified time of the file.
// //
@ -153,6 +155,8 @@ func (fi headerFileInfo) Sys() interface{} { return fi.fh }
// Because os.FileInfo's Name method returns only the base name of // Because os.FileInfo's Name method returns only the base name of
// the file it describes, it may be necessary to modify the Name field // the file it describes, it may be necessary to modify the Name field
// of the returned header to provide the full path name of the file. // of the returned header to provide the full path name of the file.
// If compression is desired, callers should set the FileHeader.Method
// field; it is unset by default.
func FileInfoHeader(fi os.FileInfo) (*FileHeader, error) { func FileInfoHeader(fi os.FileInfo) (*FileHeader, error) {
size := fi.Size() size := fi.Size()
fh := &FileHeader{ fh := &FileHeader{

1
src/archive/zip/writer.go
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@ -202,6 +202,7 @@ func (w *Writer) Close() error {
// Create adds a file to the zip file using the provided name. // Create adds a file to the zip file using the provided name.
// It returns a Writer to which the file contents should be written. // It returns a Writer to which the file contents should be written.
// The file contents will be compressed using the Deflate method.
// The name must be a relative path: it must not start with a drive // The name must be a relative path: it must not start with a drive
// letter (e.g. C:) or leading slash, and only forward slashes are // letter (e.g. C:) or leading slash, and only forward slashes are
// allowed. // allowed.