rubyzip/README.md

# rubyzip
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Rubyzip is a ruby library for reading and writing zip files.

## Important note

The Rubyzip interface has changed!!! No need to do `require "zip/zip"` and `Zip` prefix in class names removed.

If you have issues with any third-party gems that require an old version of rubyzip, you can use this workaround:

```ruby
gem 'rubyzip', '>= 1.0.0' # will load new rubyzip version
gem 'zip-zip' # will load compatibility for old rubyzip API.
```

## Requirements

* Ruby 1.9.2 or greater

## Installation
Rubyzip is available on RubyGems:

```
gem install rubyzip
```

Or in your Gemfile:

```ruby
gem 'rubyzip'
```

## Usage

### Basic zip archive creation

```ruby
require 'rubygems'
require 'zip'

folder = "Users/me/Desktop/stuff_to_zip"
input_filenames = ['image.jpg', 'description.txt', 'stats.csv']

zipfile_name = "/Users/me/Desktop/archive.zip"

Zip::File.open(zipfile_name, Zip::File::CREATE) do |zipfile|
  input_filenames.each do |filename|
    # Two arguments:
    # - The name of the file as it will appear in the archive
    # - The original file, including the path to find it
    zipfile.add(filename, File.join(folder, filename))
  end
  zipfile.get_output_stream("myFile") { |os| os.write "myFile contains just this" }
end
```

### Zipping a directory recursively
Copy from [here](https://github.com/rubyzip/rubyzip/blob/05916bf89181e1955118fd3ea059f18acac28cc8/samples/example_recursive.rb )

```ruby
require 'zip'

# This is a simple example which uses rubyzip to
# recursively generate a zip file from the contents of
# a specified directory. The directory itself is not
# included in the archive, rather just its contents.
#
# Usage:
#   directory_to_zip = "/tmp/input"
#   output_file = "/tmp/out.zip"
#   zf = ZipFileGenerator.new(directory_to_zip, output_file)
#   zf.write()
class ZipFileGenerator
  # Initialize with the directory to zip and the location of the output archive.
  def initialize(input_dir, output_file)
    @input_dir = input_dir
    @output_file = output_file
  end

  # Zip the input directory.
  def write
    entries = Dir.entries(@input_dir) - %w(. ..)

    ::Zip::File.open(@output_file, ::Zip::File::CREATE) do |io|
      write_entries entries, '', io
    end
  end

  private

  # A helper method to make the recursion work.
  def write_entries(entries, path, io)
    entries.each do |e|
      zip_file_path = path == '' ? e : File.join(path, e)
      disk_file_path = File.join(@input_dir, zip_file_path)
      puts "Deflating #{disk_file_path}"

      if File.directory? disk_file_path
        recursively_deflate_directory(disk_file_path, io, zip_file_path)
      else
        put_into_archive(disk_file_path, io, zip_file_path)
      end
    end
  end

  def recursively_deflate_directory(disk_file_path, io, zip_file_path)
    io.mkdir zip_file_path
    subdir = Dir.entries(disk_file_path) - %w(. ..)
    write_entries subdir, zip_file_path, io
  end

  def put_into_archive(disk_file_path, io, zip_file_path)
    io.get_output_stream(zip_file_path) do |f|
      f.write(File.open(disk_file_path, 'rb').read)
    end
  end
end
```

### Save zip archive entries in sorted by name state

To save zip archives in sorted order like below, you need to set `::Zip.sort_entries` to `true`

```
Vegetable/
Vegetable/bean
Vegetable/carrot
Vegetable/celery
fruit/
fruit/apple
fruit/kiwi
fruit/mango
fruit/orange
```

After this, entries in the zip archive will be saved in ordered state.

### Default permissions of zip archives

On Posix file systems the default file permissions applied to a new archive
are (0666 - umask), which mimics the behavior of standard tools such as `touch`.

On Windows the default file permissions are set to 0644 as suggested by the
[Ruby File documentation](http://ruby-doc.org/core-2.2.2/File.html).

When modifying a zip archive the file permissions of the archive are preserved.

### Reading a Zip file

```ruby
Zip::File.open('foo.zip') do |zip_file|
  # Handle entries one by one
  zip_file.each do |entry|
    # Extract to file/directory/symlink
    puts "Extracting #{entry.name}"
    entry.extract(dest_file)

    # Read into memory
    content = entry.get_input_stream.read
  end

  # Find specific entry
  entry = zip_file.glob('*.csv').first
  puts entry.get_input_stream.read
end
```

#### Notice about ::Zip::InputStream

`::Zip::InputStream` usable for fast reading zip file content because it not read Central directory.

But there is one exception when it is not working - General Purpose Flag Bit 3.

```
If bit 3 (0x08) of the general-purpose flags field is set, then the CRC-32 and file sizes are not known when the header is written. The fields in the local header are filled with zero, and the CRC-32 and size are appended in a 12-byte structure (optionally preceded by a 4-byte signature) immediately after the compressed data
```

If `::Zip::InputStream` finds such entry in the zip archive it will raise an exception.

### Password Protection (Experimental)

Rubyzip supports reading/writing zip files with traditional zip encryption (a.k.a. "ZipCrypto"). AES encryption is not yet supported. It can be used with buffer streams, e.g.:

```ruby
Zip::OutputStream.write_buffer(::StringIO.new(''), Zip::TraditionalEncrypter.new('password')) do |out|
  out.put_next_entry("my_file.txt")
  out.write my_data
end.string
```

This is an experimental feature and the interface for encryption may change in future versions.

## Known issues

### Modify docx file with rubyzip

Use `write_buffer` instead `open`. Thanks to @jondruse

```ruby
buffer = Zip::OutputStream.write_buffer do |out|
  @zip_file.entries.each do |e|
    unless [DOCUMENT_FILE_PATH, RELS_FILE_PATH].include?(e.name)
      out.put_next_entry(e.name)
      out.write e.get_input_stream.read
     end
  end

  out.put_next_entry(DOCUMENT_FILE_PATH)
  out.write xml_doc.to_xml(:indent => 0).gsub("\n","")

  out.put_next_entry(RELS_FILE_PATH)
  out.write rels.to_xml(:indent => 0).gsub("\n","")
end

File.open(new_path, "wb") {|f| f.write(buffer.string) }
```

## Configuration

By default, rubyzip will not overwrite files if they already exist inside of the extracted path.  To change this behavior, you may specify a configuration option like so:

```ruby
Zip.on_exists_proc = true
```

If you're using rubyzip with rails, consider placing this snippet of code in an initializer file such as `config/initializers/rubyzip.rb`

Additionally, if you want to configure rubyzip to overwrite existing files while creating a .zip file, you can do so with the following:

```ruby
Zip.continue_on_exists_proc = true
```

If you want to store non-english names and want to open them on Windows(pre 7) you need to set this option:

```ruby
Zip.unicode_names = true
```

Some zip files might have an invalid date format, which will raise a warning. You can hide this warning with the following setting:

```ruby
Zip.warn_invalid_date = false
```

You can set the default compression level like so:

```ruby
Zip.default_compression = Zlib::DEFAULT_COMPRESSION
```
It defaults to `Zlib::DEFAULT_COMPRESSION`. Possible values are `Zlib::BEST_COMPRESSION`, `Zlib::DEFAULT_COMPRESSION` and `Zlib::NO_COMPRESSION`

You can set multiple settings at the same time by using a block:

```ruby
  Zip.setup do |c|
    c.on_exists_proc = true
    c.continue_on_exists_proc = true
    c.unicode_names = true
    c.default_compression = Zlib::BEST_COMPRESSION
  end
```

By default, Zip64 support is disabled for writing. To enable it do this:

```ruby
Zip.write_zip64_support = true
```

_NOTE_: If you will enable Zip64 writing then you will need zip extractor with Zip64 support to extract archive.

## Developing

To run the test you need to do this:

```
bundle install
rake
```

## Website and Project Home

http://github.com/rubyzip/rubyzip

http://rdoc.info/github/rubyzip/rubyzip/master/frames

## Authors

Alexander Simonov ( alex at simonov.me)

Alan Harper ( alan at aussiegeek.net)

Thomas Sondergaard (thomas at sondergaard.cc)

Technorama Ltd. (oss-ruby-zip at technorama.net)

extra-field support contributed by Tatsuki Sugiura (sugi at nemui.org)

## License

Rubyzip is distributed under the same license as ruby. See
http://www.ruby-lang.org/en/LICENSE.txt