github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/Unknwon/cae/tz/stream.go (about)

     1  // Copyright 2014 Unknown
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package tz
    16  
    17  import (
    18  	"archive/tar"
    19  	"compress/gzip"
    20  	"io"
    21  	"os"
    22  	"path/filepath"
    23  )
    24  
    25  // A StreamArchive represents a streamable archive.
    26  type StreamArchive struct {
    27  	*tar.Writer
    28  	gw *gzip.Writer
    29  }
    30  
    31  func (s *StreamArchive) Close() (err error) {
    32  	if err = s.Writer.Close(); err != nil {
    33  		return err
    34  	}
    35  	return s.gw.Close()
    36  }
    37  
    38  // NewStreamArachive returns a new streamable archive with given io.Writer.
    39  // It's caller's responsibility to close io.Writer and streamer after operation.
    40  func NewStreamArachive(w io.Writer) *StreamArchive {
    41  	s := &StreamArchive{}
    42  	s.gw = gzip.NewWriter(w)
    43  	s.Writer = tar.NewWriter(s.gw)
    44  	return s
    45  }
    46  
    47  // StreamFile streams a file or directory entry into StreamArchive.
    48  func (s *StreamArchive) StreamFile(relPath string, fi os.FileInfo, data []byte) error {
    49  	if fi.IsDir() {
    50  		fh, err := tar.FileInfoHeader(fi, "")
    51  		if err != nil {
    52  			return err
    53  		}
    54  		fh.Name = relPath + "/"
    55  		if err = s.Writer.WriteHeader(fh); err != nil {
    56  			return err
    57  		}
    58  	} else {
    59  		target := ""
    60  		if fi.Mode()&os.ModeSymlink != 0 {
    61  			target = string(data)
    62  		}
    63  
    64  		fh, err := tar.FileInfoHeader(fi, target)
    65  		if err != nil {
    66  			return err
    67  		}
    68  		fh.Name = filepath.Join(relPath, fi.Name())
    69  		if err = s.Writer.WriteHeader(fh); err != nil {
    70  			return err
    71  		}
    72  
    73  		if _, err = s.Writer.Write(data); err != nil {
    74  			return err
    75  		}
    76  	}
    77  	return nil
    78  }
    79  
    80  // StreamReader streams data from io.Reader to StreamArchive.
    81  func (s *StreamArchive) StreamReader(relPath string, fi os.FileInfo, r io.Reader) (err error) {
    82  	fh, err := tar.FileInfoHeader(fi, "")
    83  	if err != nil {
    84  		return err
    85  	}
    86  	fh.Name = filepath.Join(relPath, fi.Name())
    87  	if err = s.Writer.WriteHeader(fh); err != nil {
    88  		return err
    89  	}
    90  	_, err = io.Copy(s.Writer, r)
    91  	return err
    92  }