Class: Zip::ZipFile

Inherits:
ZipCentralDirectory show all
Includes:
ZipFileSystem
Defined in:
lib/zip/zip.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

Methods included from Enumerable

#inject, #select_map

Constructor Details

#initialize(fileName, create = nil) ⇒ ZipFile

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



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# File 'lib/zip/zip.rb', line 1019

def initialize(fileName, create = nil)
  super()
  @name = fileName
  @comment = ""
  if (File.exists?(fileName))
	File.open(name, "rb") { |f| read_from_stream(f) }
  elsif (create)
	@entrySet = ZipEntrySet.new
  else
	raise ZipError, "File #{fileName} not found"
  end
  @create = create
  @storedEntries = @entrySet.dup
end

Instance Attribute Details

#comment ⇒ Object

Returns the zip files comment, if it has one



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# File 'lib/zip/zip.rb', line 1051

def comment
  @comment
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/zip/zip.rb', line 1015

def name
  @name
end

Class Method Details

.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).



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# File 'lib/zip/zip.rb', line 1059

def ZipFile.foreach(aZipFileName, &block)
  ZipFile.open(aZipFileName) {
	|zipFile|
	zipFile.each(&block)
  }
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.



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# File 'lib/zip/zip.rb', line 1037

def ZipFile.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



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# File 'lib/zip/zip.rb', line 1098

def add(entry, srcPath, &continueOnExistsProc)
  continueOnExistsProc ||= proc { false }
  check_entry_exists(entry, continueOnExistsProc, "add")
  newEntry = entry.kind_of?(ZipEntry) ? entry : ZipEntry.new(@name, entry.to_s)
  if is_directory(newEntry, srcPath)
	@entrySet << ZipStreamableDirectory.new(newEntry)
  else
	@entrySet << ZipStreamableFile.new(newEntry, srcPath)
  end
end

#close ⇒ Object

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



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# File 'lib/zip/zip.rb', line 1157

def close
  commit
end

#commit ⇒ Object

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



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# File 'lib/zip/zip.rb', line 1141

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) }
	  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) 


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# File 'lib/zip/zip.rb', line 1163

def commit_required?
  return @entrySet != @storedEntries || @create == ZipFile::CREATE
end

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

Extracts entry to file destPath.



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# File 'lib/zip/zip.rb', line 1129

def extract(entry, destPath, &onExistsProc)
  onExistsProc ||= proc { false }
  foundEntry = get_entry(entry)
  if foundEntry.is_directory
	create_directory(foundEntry, destPath, &onExistsProc)
  else
	write_file(foundEntry, destPath, &onExistsProc) 
  end
end

#find_entry(entry) ⇒ Object

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



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# File 'lib/zip/zip.rb', line 1169

def find_entry(entry)
  @entrySet.detect { 
	|e| 
	e.name.sub(/\/$/, "") == entry.to_s.sub(/\/$/, "")
  }
end

#get_entry(entry) ⇒ Object

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



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# File 'lib/zip/zip.rb', line 1178

def get_entry(entry)
  selectedEntry = find_entry(entry)
  unless selectedEntry
	raise Errno::ENOENT, entry
  end
  return 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.



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# File 'lib/zip/zip.rb', line 1069

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

#get_output_stream(entry, &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.



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# File 'lib/zip/zip.rb', line 1076

def get_output_stream(entry, &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
  zipStreamableEntry = ZipStreamableStream.new(newEntry)
  @entrySet << zipStreamableEntry
  zipStreamableEntry.get_output_stream(&aProc)      
end

#mkdir(entryName, permissionInt = 0) ⇒ Object

Creates a directory



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# File 'lib/zip/zip.rb', line 1187

def mkdir(entryName, permissionInt = 0) #permissionInt ignored
  if find_entry(entryName)
    raise Errno::EEXIST, "File exists - #{entryName}"
  end
  @entrySet << ZipStreamableDirectory.new(ZipEntry.new(name, entryName.to_s.ensure_end("/")))
end

#read(entry) ⇒ Object

Returns a string containing the contents of the specified entry



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# File 'lib/zip/zip.rb', line 1093

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

#remove(entry) ⇒ Object

Removes the specified entry.



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# File 'lib/zip/zip.rb', line 1110

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

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

Renames the specified entry.



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# File 'lib/zip/zip.rb', line 1115

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

#replace(entry, srcPath) ⇒ Object

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



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# File 'lib/zip/zip.rb', line 1123

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

#to_s ⇒ Object

Returns the name of the zip archive



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# File 'lib/zip/zip.rb', line 1088

def to_s
  @name
end