github.com/westcoastroms/westcoastroms-build@v0.0.0-20190928114312-2350e5a73030/build/soong/jar/jar.go (about)

     1  // Copyright 2017 Google Inc. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain 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,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package jar
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"io/ioutil"
    21  	"os"
    22  	"strings"
    23  	"time"
    24  
    25  	"android/soong/third_party/zip"
    26  )
    27  
    28  const (
    29  	MetaDir         = "META-INF/"
    30  	ManifestFile    = MetaDir + "MANIFEST.MF"
    31  	ModuleInfoClass = "module-info.class"
    32  )
    33  
    34  var DefaultTime = time.Date(2008, 1, 1, 0, 0, 0, 0, time.UTC)
    35  
    36  var MetaDirExtra = [2]byte{0xca, 0xfe}
    37  
    38  // EntryNamesLess tells whether <filepathA> should precede <filepathB> in
    39  // the order of files with a .jar
    40  func EntryNamesLess(filepathA string, filepathB string) (less bool) {
    41  	diff := index(filepathA) - index(filepathB)
    42  	if diff == 0 {
    43  		return filepathA < filepathB
    44  	}
    45  	return diff < 0
    46  }
    47  
    48  // Treats trailing * as a prefix match
    49  func patternMatch(pattern, name string) bool {
    50  	if strings.HasSuffix(pattern, "*") {
    51  		return strings.HasPrefix(name, strings.TrimSuffix(pattern, "*"))
    52  	} else {
    53  		return name == pattern
    54  	}
    55  }
    56  
    57  var jarOrder = []string{
    58  	MetaDir,
    59  	ManifestFile,
    60  	MetaDir + "*",
    61  	"*",
    62  }
    63  
    64  func index(name string) int {
    65  	for i, pattern := range jarOrder {
    66  		if patternMatch(pattern, name) {
    67  			return i
    68  		}
    69  	}
    70  	panic(fmt.Errorf("file %q did not match any pattern", name))
    71  }
    72  
    73  func MetaDirFileHeader() *zip.FileHeader {
    74  	dirHeader := &zip.FileHeader{
    75  		Name:  MetaDir,
    76  		Extra: []byte{MetaDirExtra[1], MetaDirExtra[0], 0, 0},
    77  	}
    78  	dirHeader.SetMode(0700 | os.ModeDir)
    79  	dirHeader.SetModTime(DefaultTime)
    80  
    81  	return dirHeader
    82  }
    83  
    84  // Convert manifest source path to zip header and contents.  If path is empty uses a default
    85  // manifest.
    86  func ManifestFileContents(src string) (*zip.FileHeader, []byte, error) {
    87  	b, err := manifestContents(src)
    88  	if err != nil {
    89  		return nil, nil, err
    90  	}
    91  
    92  	fh := &zip.FileHeader{
    93  		Name:               ManifestFile,
    94  		Method:             zip.Store,
    95  		UncompressedSize64: uint64(len(b)),
    96  	}
    97  	fh.SetMode(0700)
    98  	fh.SetModTime(DefaultTime)
    99  
   100  	return fh, b, nil
   101  }
   102  
   103  // Convert manifest source path to contents.  If path is empty uses a default manifest.
   104  func manifestContents(src string) ([]byte, error) {
   105  	var givenBytes []byte
   106  	var err error
   107  
   108  	if src != "" {
   109  		givenBytes, err = ioutil.ReadFile(src)
   110  		if err != nil {
   111  			return nil, err
   112  		}
   113  	}
   114  
   115  	manifestMarker := []byte("Manifest-Version:")
   116  	header := append(manifestMarker, []byte(" 1.0\nCreated-By: soong_zip\n")...)
   117  
   118  	var finalBytes []byte
   119  	if !bytes.Contains(givenBytes, manifestMarker) {
   120  		finalBytes = append(append(header, givenBytes...), byte('\n'))
   121  	} else {
   122  		finalBytes = givenBytes
   123  	}
   124  
   125  	return finalBytes, nil
   126  }