module Compress::Zip

Overview

The Compress::Zip module contains readers and writers of the zip file format, described atPKWARE's site.

NOTE To useZip or its children, you must explicitly import it withrequire "compress/zip"

Reading zip files

Two types are provided to read from zip files:

• Compress::Zip::File: can read zip entries from aFile or from anIO::Memory and provides random read access to its entries.
• Compress::Zip::Reader: can only read zip entries sequentially from anyIO.

Compress::Zip::File is the preferred method to read zip files if you can provide aFile, because it's a bit more flexible and provides more complete information for zip entries (such as comments).

When reading zip files, CRC32 checksum values are automatically verified when finishing reading an entry, andCompress::Zip::Error will be raised if the computed CRC32 checksum does not match.

Writer zip files

UseCompress::Zip::Writer, which writes zip entries sequentially to anyIO.

NOTE only compression methods 0 (STORED) and 8 (DEFLATED) are supported. Additionally, ZIP64 is not yet supported.

Defined in:

compress/zip/checksum_reader.cr
compress/zip/checksum_writer.cr
compress/zip/zip.cr

Constant Summary

CENTRAL_DIRECTORY_HEADER_SIGNATURE = 33639248

END_OF_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 101010256

VERSION = 20_u16