zip-archive- Library for creating and modifying zip archives.

Portabilityso far only tested on GHC
MaintainerJohn MacFarlane < jgm at berkeley dot edu >
Safe HaskellNone




The zip-archive library provides functions for creating, modifying, and extracting files from zip archives.

Certain simplifying assumptions are made about the zip archives: in particular, there is no support for encryption, zip files that span multiple disks, ZIP64, OS-specific file attributes, or compression methods other than Deflate. However, the library should be able to read the most common zip archives, and the archives it produces should be readable by all standard unzip programs.

As an example of the use of the library, a standalone zip archiver and extracter, Zip.hs, is provided in the source distribution.

For more information on the format of zip archives, consult


Data structures

data Archive Source

Structured representation of a zip archive, including directory information and contents (in lazy bytestrings).




zEntries :: [Entry]

Files in zip archive

zSignature :: Maybe ByteString

Digital signature

zComment :: ByteString

Comment for whole zip archive

data Entry Source

Representation of an archived file, including content and metadata.




eRelativePath :: FilePath

Relative path, using / as separator

eCompressionMethod :: CompressionMethod

Compression method

eLastModified :: Integer

Modification time (seconds since unix epoch)

eCRC32 :: Word32

CRC32 checksum

eCompressedSize :: Word32

Compressed size in bytes

eUncompressedSize :: Word32

Uncompressed size in bytes

eExtraField :: ByteString

Extra field - unused by this library

eFileComment :: ByteString

File comment - unused by this library

eInternalFileAttributes :: Word16

Internal file attributes - unused by this library

eExternalFileAttributes :: Word32

External file attributes (system-dependent)

eCompressedData :: ByteString

Compressed contents of file


data ZipOption Source



Recurse into directories when adding files


Print information to stderr

OptDestination FilePath

Directory in which to extract

OptLocation FilePath Bool

Where to place file when adding files and whether to append current path

emptyArchive :: ArchiveSource

A zip archive with no contents.

Pure functions for working with zip archives

toArchive :: ByteString -> ArchiveSource

Reads an Archive structure from a raw zip archive (in a lazy bytestring).

toArchiveOrFail :: ByteString -> Either String ArchiveSource

Like toArchive, but returns an Either value instead of raising an error if the archive cannot be decoded.

fromArchive :: Archive -> ByteStringSource

Writes an Archive structure to a raw zip archive (in a lazy bytestring).

filesInArchive :: Archive -> [FilePath]Source

Returns a list of files in a zip archive.

addEntryToArchive :: Entry -> Archive -> ArchiveSource

Adds an entry to a zip archive, or updates an existing entry.

deleteEntryFromArchive :: FilePath -> Archive -> ArchiveSource

Deletes an entry from a zip archive.

findEntryByPath :: FilePath -> Archive -> Maybe EntrySource

Returns Just the zip entry with the specified path, or Nothing.

fromEntry :: Entry -> ByteStringSource

Returns uncompressed contents of zip entry.



:: FilePath

File path for entry

-> Integer

Modification time for entry (seconds since unix epoch)

-> ByteString

Contents of entry

-> Entry 

Create an Entry with specified file path, modification time, and contents.

IO functions for working with zip archives

readEntry :: [ZipOption] -> FilePath -> IO EntrySource

Generates a Entry from a file or directory.

writeEntry :: [ZipOption] -> Entry -> IO ()Source

Writes contents of an Entry to a file.

addFilesToArchive :: [ZipOption] -> Archive -> [FilePath] -> IO ArchiveSource

Add the specified files to an Archive. If OptRecursive is specified, recursively add files contained in directories. If OptVerbose is specified, print messages to stderr.

extractFilesFromArchive :: [ZipOption] -> Archive -> IO ()Source

Extract all files from an Archive, creating directories as needed. If OptVerbose is specified, print messages to stderr. Note that the last-modified time is set correctly only in POSIX, not in Windows.