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// 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 cae implements PHP-like Compression and Archive Extensions.
package cae
import (
"io"
"os"
"strings"
)
// A Streamer describes an streamable archive object.
type Streamer interface {
StreamFile(string, os.FileInfo, []byte) error
StreamReader(string, os.FileInfo, io.Reader) error
Close() error
}
// A HookFunc represents a middleware for packing and extracting archive.
type HookFunc func(string, os.FileInfo) error
// HasPrefix returns true if name has any string in given slice as prefix.
func HasPrefix(name string, prefixes []string) bool {
for _, prefix := range prefixes {
if strings.HasPrefix(name, prefix) {
return true
}
}
return false
}
// IsEntry returns true if name equals to any string in given slice.
func IsEntry(name string, entries []string) bool {
for _, e := range entries {
if e == name {
return true
}
}
return false
}
// IsFilter returns true if given name matches any of global filter rule.
func IsFilter(name string) bool {
if strings.Contains(name, ".DS_Store") {
return true
}
return false
}
// IsExist returns true if given path is a file or directory.
func IsExist(path string) bool {
_, err := os.Stat(path)
return err == nil || os.IsExist(err)
}
// Copy copies file from source to target path.
func Copy(dest, src string) error {
// Gather file information to set back later.
si, err := os.Lstat(src)
if err != nil {
return err
}
// Handle symbolic link.
if si.Mode()&os.ModeSymlink != 0 {
target, err := os.Readlink(src)
if err != nil {
return err
}
// NOTE: os.Chmod and os.Chtimes don't recoganize symbolic link,
// which will lead "no such file or directory" error.
return os.Symlink(target, dest)
}
sr, err := os.Open(src)
if err != nil {
return err
}
defer sr.Close()
dw, err := os.Create(dest)
if err != nil {
return err
}
defer dw.Close()
if _, err = io.Copy(dw, sr); err != nil {
return err
}
// Set back file information.
if err = os.Chtimes(dest, si.ModTime(), si.ModTime()); err != nil {
return err
}
return os.Chmod(dest, si.Mode())
}
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