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gitea/vendor/github.com/unknwon/cae/zip/zip.go

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5.9 KiB

// Copyright 2013 Unknown
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// Package zip enables you to transparently read or write ZIP compressed archives and the files inside them.
package zip
import (
"archive/zip"
"errors"
"io"
"os"
"path"
"strings"
"github.com/unknwon/cae"
)
// A File represents a file or directory entry in archive.
type File struct {
*zip.FileHeader
oldName string // NOTE: unused, for future change name feature.
oldComment string // NOTE: unused, for future change comment feature.
absPath string // Absolute path of local file system.
tmpPath string
}
// A ZipArchive represents a file archive, compressed with Zip.
type ZipArchive struct {
*zip.ReadCloser
FileName string
Comment string
NumFiles int
Flag int
Permission os.FileMode
files []*File
isHasChanged bool
// For supporting flushing to io.Writer.
writer io.Writer
isHasWriter bool
}
// OpenFile is the generalized open call; most users will use Open
// instead. It opens the named zip file with specified flag
// (O_RDONLY etc.) if applicable. If successful,
// methods on the returned ZipArchive can be used for I/O.
// If there is an error, it will be of type *PathError.
func OpenFile(name string, flag int, perm os.FileMode) (*ZipArchive, error) {
z := new(ZipArchive)
err := z.Open(name, flag, perm)
return z, err
}
// Create creates the named zip file, truncating
// it if it already exists. If successful, methods on the returned
// ZipArchive can be used for I/O; the associated file descriptor has mode
// O_RDWR.
// If there is an error, it will be of type *PathError.
func Create(name string) (*ZipArchive, error) {
os.MkdirAll(path.Dir(name), os.ModePerm)
return OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
}
// Open opens the named zip file for reading. If successful, methods on
// the returned ZipArchive can be used for reading; the associated file
// descriptor has mode O_RDONLY.
// If there is an error, it will be of type *PathError.
func Open(name string) (*ZipArchive, error) {
return OpenFile(name, os.O_RDONLY, 0)
}
// New accepts a variable that implemented interface io.Writer
// for write-only purpose operations.
func New(w io.Writer) *ZipArchive {
return &ZipArchive{
writer: w,
isHasWriter: true,
}
}
// List returns a string slice of files' name in ZipArchive.
// Specify prefixes will be used as filters.
func (z *ZipArchive) List(prefixes ...string) []string {
isHasPrefix := len(prefixes) > 0
names := make([]string, 0, z.NumFiles)
for _, f := range z.files {
if isHasPrefix && !cae.HasPrefix(f.Name, prefixes) {
continue
}
names = append(names, f.Name)
}
return names
}
// AddEmptyDir adds a raw directory entry to ZipArchive,
// it returns false if same directory enry already existed.
func (z *ZipArchive) AddEmptyDir(dirPath string) bool {
dirPath = strings.Replace(dirPath, "\\", "/", -1)
if !strings.HasSuffix(dirPath, "/") {
dirPath += "/"
}
for _, f := range z.files {
if dirPath == f.Name {
return false
}
}
dirPath = strings.TrimSuffix(dirPath, "/")
if strings.Contains(dirPath, "/") {
// Auto add all upper level directories.
z.AddEmptyDir(path.Dir(dirPath))
}
z.files = append(z.files, &File{
FileHeader: &zip.FileHeader{
Name: dirPath + "/",
UncompressedSize: 0,
},
})
z.updateStat()
return true
}
// AddDir adds a directory and subdirectories entries to ZipArchive.
func (z *ZipArchive) AddDir(dirPath, absPath string) error {
dir, err := os.Open(absPath)
if err != nil {
return err
}
defer dir.Close()
// Make sure we have all upper level directories.
z.AddEmptyDir(dirPath)
fis, err := dir.Readdir(0)
if err != nil {
return err
}
for _, fi := range fis {
curPath := absPath + "/" + fi.Name()
tmpRecPath := path.Join(dirPath, fi.Name())
if fi.IsDir() {
if err = z.AddDir(tmpRecPath, curPath); err != nil {
return err
}
} else {
if err = z.AddFile(tmpRecPath, curPath); err != nil {
return err
}
}
}
return nil
}
// updateStat should be called after every change for rebuilding statistic.
func (z *ZipArchive) updateStat() {
z.NumFiles = len(z.files)
z.isHasChanged = true
}
// AddFile adds a file entry to ZipArchive.
func (z *ZipArchive) AddFile(fileName, absPath string) error {
fileName = strings.Replace(fileName, "\\", "/", -1)
absPath = strings.Replace(absPath, "\\", "/", -1)
if cae.IsFilter(absPath) {
return nil
}
f, err := os.Open(absPath)
if err != nil {
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
file := new(File)
file.FileHeader, err = zip.FileInfoHeader(fi)
if err != nil {
return err
}
file.Name = fileName
file.absPath = absPath
z.AddEmptyDir(path.Dir(fileName))
isExist := false
for _, f := range z.files {
if fileName == f.Name {
f = file
isExist = true
break
}
}
if !isExist {
z.files = append(z.files, file)
}
z.updateStat()
return nil
}
// DeleteIndex deletes an entry in the archive by its index.
func (z *ZipArchive) DeleteIndex(idx int) error {
if idx >= z.NumFiles {
return errors.New("index out of range of number of files")
}
z.files = append(z.files[:idx], z.files[idx+1:]...)
return nil
}
// DeleteName deletes an entry in the archive by its name.
func (z *ZipArchive) DeleteName(name string) error {
for i, f := range z.files {
if f.Name == name {
return z.DeleteIndex(i)
}
}
return errors.New("entry with given name not found")
}