Class: Zip::ZipFile

Inherits:
ZipCentralDirectory show all
Includes:
ZipFileSystem
Defined in:
lib/zip/zip_file.rb,
lib/zip/zipfilesystem.rb

Overview

ZipFile is modeled after java.util.zip.ZipFile from the Java SDK. The most important methods are those inherited from ZipCentralDirectory for accessing information about the entries in the archive and methods such as get_input_stream and get_output_stream for reading from and writing entries to the archive. The class includes a few convenience methods such as #extract for extracting entries to the filesystem, and #remove, #replace, #rename and #mkdir for making simple modifications to the archive.

Modifications to a zip archive are not committed until #commit or #close is called. The method #open accepts a block following the pattern from File.open offering a simple way to automatically close the archive when the block returns.

The following example opens zip archive my.zip (creating it if it doesn’t exist) and adds an entry first.txt and a directory entry a_dir to it.

require 'zip/zip'

Zip::ZipFile.open("my.zip", Zip::ZipFile::CREATE) {
 |zipfile|
  zipfile.get_output_stream("first.txt") { |f| f.puts "Hello from ZipFile" }
  zipfile.mkdir("a_dir")
}

The next example reopens my.zip writes the contents of first.txt to standard out and deletes the entry from the archive.

require 'zip/zip'

Zip::ZipFile.open("my.zip", Zip::ZipFile::CREATE) {
  |zipfile|
  puts zipfile.read("first.txt")
  zipfile.remove("first.txt")
}

ZipFileSystem offers an alternative API that emulates ruby’s interface for accessing the filesystem, ie. the File and Dir classes.

Constant Summary collapse

CREATE = 
1

Constants inherited from ZipCentralDirectory

Zip::ZipCentralDirectory::END_OF_CENTRAL_DIRECTORY_SIGNATURE, Zip::ZipCentralDirectory::MAX_END_OF_CENTRAL_DIRECTORY_STRUCTURE_SIZE, Zip::ZipCentralDirectory::STATIC_EOCD_SIZE

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ZipFileSystem

#dir, #file

Methods inherited from ZipCentralDirectory

#==, #each, #entries, #get_e_o_c_d, #read_central_directory_entries, #read_e_o_c_d, #read_from_stream, read_from_stream, #size, #write_to_stream

Constructor Details

#initialize(fileName, create = nil, buffer = false) ⇒ ZipFile

Opens a zip archive. Pass true as the second parameter to create a new archive if it doesn’t exist already.



60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/zip/zip_file.rb', line 60

def initialize(fileName, create = nil, buffer = false)
  super()
  @name = fileName
  @comment = ""
  case
    when ::File.exists?(fileName) && !buffer
      ::File.open(name, "rb") do |f|
        read_from_stream(f)
      end
    when create
      @entrySet = ZipEntrySet.new
    else
      raise ZipError, "File #{fileName} not found"
  end
  @create = create
  @storedEntries = @entrySet.dup
  @storedComment = @comment
  @restore_ownership = false
  @restore_permissions = false
  @restore_times = true
end

Instance Attribute Details

#comment ⇒ Object

Returns the zip files comment, if it has one



120
121
122
 
# File 'lib/zip/zip_file.rb', line 120

def comment
  @comment
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



49
50
51
 
# File 'lib/zip/zip_file.rb', line 49

def name
  @name
end

#restore_ownership ⇒ Object

default -> false



52
53
54
 
# File 'lib/zip/zip_file.rb', line 52

def restore_ownership
  @restore_ownership
end

#restore_permissions ⇒ Object

default -> false



54
55
56
 
# File 'lib/zip/zip_file.rb', line 54

def restore_permissions
  @restore_permissions
end

#restore_times ⇒ Object

default -> true



56
57
58
 
# File 'lib/zip/zip_file.rb', line 56

def restore_times
  @restore_times
end

Class Method Details

.add_buffer {|zf| ... } ⇒ Object

Same as #open. But outputs data to a buffer instead of a file

Yields:

  • (zf) 


100
101
102
103
104
 
# File 'lib/zip/zip_file.rb', line 100

def add_buffer
  zf = ZipFile.new('', true, true)
  yield zf
  zf.write_buffer
end

.foreach(aZipFileName, &block) ⇒ Object

Iterates over the contents of the ZipFile. This is more efficient than using a ZipInputStream since this methods simply iterates through the entries in the central directory structure in the archive whereas ZipInputStream jumps through the entire archive accessing the local entry headers (which contain the same information as the central directory).



112
113
114
115
116
 
# File 'lib/zip/zip_file.rb', line 112

def foreach(aZipFileName, &block)
  open(aZipFileName) do |zipFile|
    zipFile.each(&block)
  end
end

.open(fileName, create = nil) ⇒ Object

Same as #new. If a block is passed the ZipFile object is passed to the block and is automatically closed afterwards just as with ruby’s builtin File.open method.



86
87
88
89
90
91
92
93
94
95
96
97
 
# File 'lib/zip/zip_file.rb', line 86

def open(fileName, create = nil)
  zf = ZipFile.new(fileName, create)
  if block_given?
    begin
      yield zf
    ensure
      zf.close
    end
  else
    zf
  end
end

Instance Method Details

#add(entry, srcPath, &continueOnExistsProc) ⇒ Object

Convenience method for adding the contents of a file to the archive



155
156
157
158
159
160
161
 
# File 'lib/zip/zip_file.rb', line 155

def add(entry, srcPath, &continueOnExistsProc)
  continueOnExistsProc ||= proc { Zip.options[:continue_on_exists_proc] }
  check_entry_exists(entry, continueOnExistsProc, "add")
  newEntry = entry.kind_of?(ZipEntry) ? entry : ZipEntry.new(@name, entry.to_s)
  newEntry.gather_fileinfo_from_srcpath(srcPath)
  @entrySet << newEntry
end

#close ⇒ Object

Closes the zip file committing any changes that has been made.



223
224
225
 
# File 'lib/zip/zip_file.rb', line 223

def close
  commit
end

#commit ⇒ Object

Commits changes that has been made since the previous commit to the zip archive.



194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
 
# File 'lib/zip/zip_file.rb', line 194

def commit
  return if !commit_required?
  on_success_replace(name) {
    |tmpFile|
    ZipOutputStream.open(tmpFile) {
      |zos|

      @entrySet.each {
        |e|
        e.write_to_zip_output_stream(zos)
        e.dirty = false
      }
      zos.comment = comment
    }
    true
  }
  initialize(name)
end

#commit_required? ⇒ Boolean

Returns true if any changes has been made to this archive since the previous commit

Returns:

  • (Boolean) 


229
230
231
232
233
234
 
# File 'lib/zip/zip_file.rb', line 229

def commit_required?
  @entrySet.each do |e|
    return true if e.dirty
  end
  @comment != @storedComment || @entrySet != @storedEntries || @create == ZipFile::CREATE
end

#extract(entry, destPath, &onExistsProc) ⇒ Object

Extracts entry to file destPath.



186
187
188
189
190
 
# File 'lib/zip/zip_file.rb', line 186

def extract(entry, destPath, &onExistsProc)
  onExistsProc ||= proc { Zip.options[:on_exists_proc] }
  foundEntry = get_entry(entry)
  foundEntry.extract(destPath, &onExistsProc)
end

#find_entry(entry_name) ⇒ Object

Searches for entry with the specified name. Returns nil if no entry is found. See also get_entry



238
239
240
 
# File 'lib/zip/zip_file.rb', line 238

def find_entry(entry_name)
  @entrySet.find_entry(entry_name)
end

#get_entry(entry) ⇒ Object

Searches for an entry just as find_entry, but throws Errno::ENOENT if no entry is found.



244
245
246
247
248
249
250
251
252
253
 
# File 'lib/zip/zip_file.rb', line 244

def get_entry(entry)
  selectedEntry = find_entry(entry)
  unless selectedEntry
    raise Errno::ENOENT, entry
  end
  selectedEntry.restore_ownership = @restore_ownership
  selectedEntry.restore_permissions = @restore_permissions
  selectedEntry.restore_times = @restore_times
  selectedEntry
end

#get_input_stream(entry, &aProc) ⇒ Object

Returns an input stream to the specified entry. If a block is passed the stream object is passed to the block and the stream is automatically closed afterwards just as with ruby’s builtin File.open method.



125
126
127
 
# File 'lib/zip/zip_file.rb', line 125

def get_input_stream(entry, &aProc)
  get_entry(entry).get_input_stream(&aProc)
end

#get_output_stream(entry, permissionInt = nil, &aProc) ⇒ Object

Returns an output stream to the specified entry. If a block is passed the stream object is passed to the block and the stream is automatically closed afterwards just as with ruby’s builtin File.open method.



132
133
134
135
136
137
138
139
140
141
142
 
# File 'lib/zip/zip_file.rb', line 132

def get_output_stream(entry, permissionInt = nil, &aProc)
  newEntry = entry.kind_of?(ZipEntry) ? entry : ZipEntry.new(@name, entry.to_s)
  if newEntry.directory?
    raise ArgumentError,
      "cannot open stream to directory entry - '#{newEntry}'"
  end
  newEntry.unix_perms = permissionInt
  zipStreamableEntry = ZipStreamableStream.new(newEntry)
  @entrySet << zipStreamableEntry
  zipStreamableEntry.get_output_stream(&aProc)
end

#mkdir(entryName, permissionInt = 0755) ⇒ Object

Creates a directory



256
257
258
259
260
261
262
263
 
# File 'lib/zip/zip_file.rb', line 256

def mkdir(entryName, permissionInt = 0755)
  if find_entry(entryName)
    raise Errno::EEXIST, "File exists - #{entryName}"
  end
  entryName = entryName.dup.to_s
  entryName << '/' unless entryName.end_with?('/')
  @entrySet << ZipStreamableDirectory.new(@name, entryName, nil, permissionInt)
end

#read(entry) ⇒ Object

Returns a string containing the contents of the specified entry



150
151
152
 
# File 'lib/zip/zip_file.rb', line 150

def read(entry)
  get_input_stream(entry) { |is| is.read }
end

#remove(entry) ⇒ Object

Removes the specified entry.



164
165
166
 
# File 'lib/zip/zip_file.rb', line 164

def remove(entry)
  @entrySet.delete(get_entry(entry))
end

#rename(entry, newName, &continueOnExistsProc) ⇒ Object

Renames the specified entry.



169
170
171
172
173
174
175
 
# File 'lib/zip/zip_file.rb', line 169

def rename(entry, newName, &continueOnExistsProc)
  foundEntry = get_entry(entry)
  check_entry_exists(newName, continueOnExistsProc, "rename")
  @entrySet.delete(foundEntry)
  foundEntry.name = newName
  @entrySet << foundEntry
end

#replace(entry, srcPath) ⇒ Object

Replaces the specified entry with the contents of srcPath (from the file system).



179
180
181
182
183
 
# File 'lib/zip/zip_file.rb', line 179

def replace(entry, srcPath)
  check_file(srcPath)
  remove(entry)
  add(entry, srcPath)
end

#to_s ⇒ Object

Returns the name of the zip archive



145
146
147
 
# File 'lib/zip/zip_file.rb', line 145

def to_s
  @name
end

#write_buffer ⇒ Object

Write buffer write changes to buffer and return



214
215
216
217
218
219
220
 
# File 'lib/zip/zip_file.rb', line 214

def write_buffer
  buffer = ZipOutputStream.write_buffer do |zos|
    @entrySet.each { |e| e.write_to_zip_output_stream(zos) }
    zos.comment = comment
  end
  return buffer
end