Class: Zip::File

Inherits:
CentralDirectory show all
Includes:
FileSystem
Defined in:
lib/zip/file.rb,
lib/zip/filesystem.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::File.open("my.zip", Zip::File::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::File.open("my.zip", Zip::File::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

CREATE =
1
SPLIT_SIGNATURE =
0x08074b50
ZIP64_EOCD_SIGNATURE =
0x06064b50
MAX_SEGMENT_SIZE =
3221225472
MIN_SEGMENT_SIZE =
65536
DATA_BUFFER_SIZE =
8192

Constants inherited from CentralDirectory

CentralDirectory::END_OF_CDS, CentralDirectory::MAX_END_OF_CDS_SIZE, CentralDirectory::STATIC_EOCD_SIZE, CentralDirectory::ZIP64_END_OF_CDS, CentralDirectory::ZIP64_EOCD_LOCATOR

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from FileSystem

#dir, #file

Methods inherited from CentralDirectory

#==, #each, #entries, #get_64_e_o_c_d, #get_e_o_c_d, #read_64_e_o_c_d, #read_central_directory_entries, #read_e_o_c_d, #read_from_stream, read_from_stream, #size, #start_buf, #write_to_stream, #zip64_file?

Constructor Details

#initialize(file_name, create = nil, buffer = false, options = {}) ⇒ File

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



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
# File 'lib/zip/file.rb', line 67

def initialize(file_name, create = nil, buffer = false, options = {})
  super()
  @name    = file_name
  @comment = ''
  @create  = create
  case
  when !buffer && ::File.size?(file_name)
    @create = nil
    @exist_file_perms = ::File.stat(file_name).mode
    ::File.open(name, 'rb') do |f|
      read_from_stream(f)
    end
  when create
    @entry_set = EntrySet.new
  else
    raise Error, "File #{file_name} not found"
  end
  @stored_entries      = @entry_set.dup
  @stored_comment      = @comment
  @restore_ownership   = options[:restore_ownership]    || false
  @restore_permissions = options[:restore_permissions]  || true
  @restore_times       = options[:restore_times]        || true
end

Instance Attribute Details

#commentObject

Returns the zip files comment, if it has one



63
64
65
# File 'lib/zip/file.rb', line 63

def comment
  @comment
end

#nameObject (readonly)

Returns the value of attribute name



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

def name
  @name
end

#restore_ownershipObject

default -> false



57
58
59
# File 'lib/zip/file.rb', line 57

def restore_ownership
  @restore_ownership
end

#restore_permissionsObject

default -> false



59
60
61
# File 'lib/zip/file.rb', line 59

def restore_permissions
  @restore_permissions
end

#restore_timesObject

default -> true



61
62
63
# File 'lib/zip/file.rb', line 61

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)


106
107
108
109
110
111
# File 'lib/zip/file.rb', line 106

def add_buffer
  io = ::StringIO.new('')
  zf = ::Zip::File.new(io, true, true)
  yield zf
  zf.write_buffer(io)
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).



137
138
139
140
141
# File 'lib/zip/file.rb', line 137

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

.get_partial_zip_file_name(zip_file_name, partial_zip_file_name) ⇒ Object



154
155
156
157
158
159
# File 'lib/zip/file.rb', line 154

def get_partial_zip_file_name(zip_file_name, partial_zip_file_name)
  partial_zip_file_name = zip_file_name.sub(/#{::File.basename(zip_file_name)}\z/,
                                            partial_zip_file_name + ::File.extname(zip_file_name)) unless partial_zip_file_name.nil?
  partial_zip_file_name ||= zip_file_name
  partial_zip_file_name
end

.get_segment_count_for_split(zip_file_size, segment_size) ⇒ Object



161
162
163
# File 'lib/zip/file.rb', line 161

def get_segment_count_for_split(zip_file_size, segment_size)
  (zip_file_size / segment_size).to_i + (zip_file_size % segment_size == 0 ? 0 : 1)
end

.get_segment_size_for_split(segment_size) ⇒ Object



143
144
145
146
147
148
149
150
151
152
# File 'lib/zip/file.rb', line 143

def get_segment_size_for_split(segment_size)
  case
  when MIN_SEGMENT_SIZE > segment_size
    MIN_SEGMENT_SIZE
  when MAX_SEGMENT_SIZE < segment_size
    MAX_SEGMENT_SIZE
  else
    segment_size
  end
end

.open(file_name, 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.



95
96
97
98
99
100
101
102
103
# File 'lib/zip/file.rb', line 95

def open(file_name, create = nil)
  zf = ::Zip::File.new(file_name, create)
  return zf unless block_given?
  begin
    yield zf
  ensure
    zf.close
  end
end

.open_buffer(io, options = {}) {|zf| ... } ⇒ Object

Like #open, but reads zip archive contents from a String or open IO stream, and outputs data to a buffer. (This can be used to extract data from a downloaded zip archive without first saving it to disk.)

Yields:

  • (zf)


117
118
119
120
121
122
123
124
125
126
127
128
129
# File 'lib/zip/file.rb', line 117

def open_buffer(io, options = {})
  unless io.is_a?(IO) || io.is_a?(String) || io.is_a?(Tempfile)
    raise "Zip::File.open_buffer expects an argument of class String, IO, or Tempfile. Found: #{io.class}"
  end
  if io.is_a?(::String)
    require 'stringio'
    io = ::StringIO.new(io)
  end
  zf = ::Zip::File.new(io, true, true, options)
  zf.read_from_stream(io)
  yield zf
  zf.write_buffer(io)
end

.put_split_signature(szip_file, segment_size) ⇒ Object



165
166
167
168
169
# File 'lib/zip/file.rb', line 165

def put_split_signature(szip_file, segment_size)
  signature_packed = [SPLIT_SIGNATURE].pack('V')
  szip_file << signature_packed
  segment_size - signature_packed.size
end

.save_splited_part(zip_file, partial_zip_file_name, zip_file_size, szip_file_index, segment_size, segment_count) ⇒ Object

TODO: Make the code more understandable



174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
# File 'lib/zip/file.rb', line 174

def save_splited_part(zip_file, partial_zip_file_name, zip_file_size, szip_file_index, segment_size, segment_count)
  ssegment_size  = zip_file_size - zip_file.pos
  ssegment_size  = segment_size if ssegment_size > segment_size
  szip_file_name = "#{partial_zip_file_name}.#{'%03d'%(szip_file_index)}"
  ::File.open(szip_file_name, 'wb') do |szip_file|
    if szip_file_index == 1
      ssegment_size = put_split_signature(szip_file, segment_size)
    end
    chunk_bytes = 0
    until ssegment_size == chunk_bytes || zip_file.eof?
      segment_bytes_left = ssegment_size - chunk_bytes
      buffer_size        = segment_bytes_left < DATA_BUFFER_SIZE ? segment_bytes_left : DATA_BUFFER_SIZE
      chunk              = zip_file.read(buffer_size)
      chunk_bytes        += buffer_size
      szip_file << chunk
      # Info for track splitting
      yield segment_count, szip_file_index, chunk_bytes, ssegment_size if block_given?
    end
  end
end

.split(zip_file_name, segment_size = MAX_SEGMENT_SIZE, delete_zip_file = true, partial_zip_file_name = nil) ⇒ Object

Splits an archive into parts with segment size

Raises:



196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
# File 'lib/zip/file.rb', line 196

def split(zip_file_name, segment_size = MAX_SEGMENT_SIZE, delete_zip_file = true, partial_zip_file_name = nil)
  raise Error, "File #{zip_file_name} not found" unless ::File.exist?(zip_file_name)
  raise Errno::ENOENT, zip_file_name unless ::File.readable?(zip_file_name)
  zip_file_size = ::File.size(zip_file_name)
  segment_size  = get_segment_size_for_split(segment_size)
  return if zip_file_size <= segment_size
  segment_count = get_segment_count_for_split(zip_file_size, segment_size)
  # Checking for correct zip structure
  self.open(zip_file_name) {}
  partial_zip_file_name = get_partial_zip_file_name(zip_file_name, partial_zip_file_name)
  szip_file_index       = 0
  ::File.open(zip_file_name, 'rb') do |zip_file|
    until zip_file.eof?
      szip_file_index += 1
      save_splited_part(zip_file, partial_zip_file_name, zip_file_size, szip_file_index, segment_size, segment_count)
    end
  end
  ::File.delete(zip_file_name) if delete_zip_file
  szip_file_index
end

Instance Method Details

#add(entry, src_path, &continue_on_exists_proc) ⇒ Object

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



259
260
261
262
263
264
265
266
# File 'lib/zip/file.rb', line 259

def add(entry, src_path, &continue_on_exists_proc)
  continue_on_exists_proc ||= proc { ::Zip.continue_on_exists_proc }
  check_entry_exists(entry, continue_on_exists_proc, "add")
  new_entry = entry.kind_of?(::Zip::Entry) ? entry : ::Zip::Entry.new(@name, entry.to_s)
  new_entry.gather_fileinfo_from_srcpath(src_path)
  new_entry.dirty = true
  @entry_set << new_entry
end

#closeObject

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



324
325
326
# File 'lib/zip/file.rb', line 324

def close
  commit
end

#commitObject

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



299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
# File 'lib/zip/file.rb', line 299

def commit
  return unless commit_required?
  on_success_replace do |tmp_file|
    ::Zip::OutputStream.open(tmp_file) do |zos|
      @entry_set.each do |e|
        e.write_to_zip_output_stream(zos)
        e.dirty = false
        e.clean_up
      end
      zos.comment = comment
    end
    true
  end
  initialize(name)
end

#commit_required?Boolean

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

Returns:

  • (Boolean)


330
331
332
333
334
335
# File 'lib/zip/file.rb', line 330

def commit_required?
  @entry_set.each do |e|
    return true if e.dirty
  end
  @comment != @stored_comment || @entry_set != @stored_entries || @create == ::Zip::File::CREATE
end

#extract(entry, dest_path, &block) ⇒ Object

Extracts entry to file dest_path.



291
292
293
294
295
# File 'lib/zip/file.rb', line 291

def extract(entry, dest_path, &block)
  block ||= proc { ::Zip.on_exists_proc }
  found_entry = get_entry(entry)
  found_entry.extract(dest_path, &block)
end

#find_entry(entry_name) ⇒ Object

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



339
340
341
# File 'lib/zip/file.rb', line 339

def find_entry(entry_name)
  @entry_set.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.



350
351
352
353
354
355
356
357
358
359
# File 'lib/zip/file.rb', line 350

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



222
223
224
# File 'lib/zip/file.rb', line 222

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

#get_output_stream(entry, permission_int = nil, comment = nil, extra = nil, compressed_size = nil, crc = nil, compression_method = nil, size = nil, time = nil, &aProc) ⇒ Object

Returns an output stream to the specified entry. If entry is not an instance of Zip::Entry, a new Zip::Entry will be initialized using the arguments specified. 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.



231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
# File 'lib/zip/file.rb', line 231

def get_output_stream(entry, permission_int = nil, comment = nil, extra = nil, compressed_size = nil, crc = nil, compression_method = nil, size = nil, time = nil,  &aProc)
  new_entry =
    if entry.kind_of?(Entry)
      entry
    else
      Entry.new(@name, entry.to_s, comment, extra, compressed_size, crc, compression_method, size, time)
    end
  if new_entry.directory?
    raise ArgumentError,
          "cannot open stream to directory entry - '#{new_entry}'"
  end
  new_entry.unix_perms = permission_int
  zip_streamable_entry = StreamableStream.new(new_entry)
  @entry_set << zip_streamable_entry
  zip_streamable_entry.get_output_stream(&aProc)
end

#glob(*args, &block) ⇒ Object

Searches for entries given a glob



344
345
346
# File 'lib/zip/file.rb', line 344

def glob(*args, &block)
  @entry_set.glob(*args, &block)
end

#mkdir(entryName, permissionInt = 0755) ⇒ Object

Creates a directory



362
363
364
365
366
367
368
369
# File 'lib/zip/file.rb', line 362

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?('/')
  @entry_set << ::Zip::StreamableDirectory.new(@name, entryName, nil, permissionInt)
end

#read(entry) ⇒ Object

Returns a string containing the contents of the specified entry



254
255
256
# File 'lib/zip/file.rb', line 254

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

#remove(entry) ⇒ Object

Removes the specified entry.



269
270
271
# File 'lib/zip/file.rb', line 269

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

#rename(entry, new_name, &continue_on_exists_proc) ⇒ Object

Renames the specified entry.



274
275
276
277
278
279
280
# File 'lib/zip/file.rb', line 274

def rename(entry, new_name, &continue_on_exists_proc)
  foundEntry = get_entry(entry)
  check_entry_exists(new_name, continue_on_exists_proc, 'rename')
  @entry_set.delete(foundEntry)
  foundEntry.name = new_name
  @entry_set << foundEntry
end

#replace(entry, srcPath) ⇒ Object

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



284
285
286
287
288
# File 'lib/zip/file.rb', line 284

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

#to_sObject

Returns the name of the zip archive



249
250
251
# File 'lib/zip/file.rb', line 249

def to_s
  @name
end

#write_buffer(io = ::StringIO.new('')) ⇒ Object

Write buffer write changes to buffer and return



316
317
318
319
320
321
# File 'lib/zip/file.rb', line 316

def write_buffer(io = ::StringIO.new(''))
  ::Zip::OutputStream.write_buffer(io) do |zos|
    @entry_set.each { |e| e.write_to_zip_output_stream(zos) }
    zos.comment = comment
  end
end