ZipStream

Library to read zip file in a stream. Zip file binary stream -> stream of {:new_file,name} or uncompressed_bin

Erlang zlib library only allows deflate decompress stream. But Erlang zip library does not allow content streaming.

Usage

For instance if you have a zip with multiple files, you can use the stream to do:

File.stream!("myfile.zip", [], 500)
|> ZipStream.unzip
|> Stream.reduce(nil,fn 
  {:new_file,name},_current->name
  binary,file_name->
    #DO SOMTHING WITH the binary chunk of file_name
    file_name
end)

An other example: your zip contains only one file, in this case you can simply do the following to get a standard binary stream of this on file. (drop the {:new_file,_} of the single file)

binstream = File.stream!("myfile.zip", [], 500)
|> ZipStream.unzip
|> Stream.drop(1)

Known Limitations

This library does not handle all possible zip files, in particular:

• The zip archive contains uncompressed data or data not compressed with the deflate algorithm
• The zip archive contains data with the data_descriptor format
• The zip archive is a zip64 to handle files bigger than (2^32 4Go)

Installation

The package can be installed as:

1. Add zip_stream to your list of dependencies in mix.exs:

   def deps do

    [{:zip_stream, "~> 0.1.0"}]

   end

2. Ensure zip_stream is started before your application:

   def application do

    [applications: [:zip_stream]]

   end