Copyright	John MacFarlane
License	BSD3
Maintainer	John MacFarlane < jgm at berkeley dot edu >
Stability	unstable
Portability	so far only tested on GHC
Safe Haskell	None
Language	Haskell98

Codec.Archive.Zip

Contents

Data structures
Pure functions for working with zip archives
IO functions for working with zip archives

Description

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 http://www.pkware.com/documents/casestudies/APPNOTE.TXT

Synopsis

Data structures

data Archive #

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

Constructors

Archive
Fields zEntries :: [Entry] Files in zip archive zSignature :: Maybe ByteString Digital signature zComment :: ByteString Comment for whole zip archive

Instances

Read Archive #
Methods readsPrec :: Int -> ReadS Archive # readList :: ReadS [Archive] # readPrec :: ReadPrec Archive # readListPrec :: ReadPrec [Archive] #
Show Archive #
Methods showsPrec :: Int -> Archive -> ShowS # show :: Archive -> String # showList :: [Archive] -> ShowS #
Binary Archive #
Methods put :: Archive -> Put # get :: Get Archive # putList :: [Archive] -> Put #

data Entry #

Representation of an archived file, including content and metadata.

Constructors

Entry

Fields

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
eVersionMadeBy :: Word16
Version made by field
eInternalFileAttributes :: Word16
Internal file attributes - unused by this library
eExternalFileAttributes :: Word32
External file attributes (system-dependent)
eCompressedData :: ByteString
Compressed contents of file

Instances

Eq Entry #
Methods (==) :: Entry -> Entry -> Bool # (/=) :: Entry -> Entry -> Bool #
Read Entry #
Methods readsPrec :: Int -> ReadS Entry # readList :: ReadS [Entry] # readPrec :: ReadPrec Entry # readListPrec :: ReadPrec [Entry] #
Show Entry #
Methods showsPrec :: Int -> Entry -> ShowS # show :: Entry -> String # showList :: [Entry] -> ShowS #

data CompressionMethod #

Compression methods.

Constructors

Deflate
NoCompression

Instances

Eq CompressionMethod #
Methods (==) :: CompressionMethod -> CompressionMethod -> Bool # (/=) :: CompressionMethod -> CompressionMethod -> Bool #
Read CompressionMethod #
Methods readsPrec :: Int -> ReadS CompressionMethod # readList :: ReadS [CompressionMethod] # readPrec :: ReadPrec CompressionMethod # readListPrec :: ReadPrec [CompressionMethod] #
Show CompressionMethod #
Methods showsPrec :: Int -> CompressionMethod -> ShowS # show :: CompressionMethod -> String # showList :: [CompressionMethod] -> ShowS #

data ZipOption #

Options for addFilesToArchive and extractFilesFromArchive.

Constructors

OptRecursive	Recurse into directories when adding files
OptVerbose	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

Instances

Eq ZipOption #
Methods (==) :: ZipOption -> ZipOption -> Bool # (/=) :: ZipOption -> ZipOption -> Bool #
Read ZipOption #
Methods readsPrec :: Int -> ReadS ZipOption # readList :: ReadS [ZipOption] # readPrec :: ReadPrec ZipOption # readListPrec :: ReadPrec [ZipOption] #
Show ZipOption #
Methods showsPrec :: Int -> ZipOption -> ShowS # show :: ZipOption -> String # showList :: [ZipOption] -> ShowS #

data ZipException #

Constructors

CRC32Mismatch FilePath

Instances

Data ZipException #
Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ZipException -> c ZipException # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ZipException # toConstr :: ZipException -> Constr # dataTypeOf :: ZipException -> DataType # dataCast1 :: Typeable (* -> ) t => (forall d. Data d => c (t d)) -> Maybe (c ZipException) # dataCast2 :: Typeable ( -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ZipException) # gmapT :: (forall b. Data b => b -> b) -> ZipException -> ZipException # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ZipException -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ZipException -> r # gmapQ :: (forall d. Data d => d -> u) -> ZipException -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> ZipException -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> ZipException -> m ZipException # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ZipException -> m ZipException # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ZipException -> m ZipException #
Show ZipException #
Methods showsPrec :: Int -> ZipException -> ShowS # show :: ZipException -> String # showList :: [ZipException] -> ShowS #
Exception ZipException #
Methods toException :: ZipException -> SomeException # fromException :: SomeException -> Maybe ZipException # displayException :: ZipException -> String #

emptyArchive :: Archive #

A zip archive with no contents.

Pure functions for working with zip archives

toArchive :: ByteString -> Archive #

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

toArchiveOrFail :: ByteString -> Either String Archive #

Like toArchive, but returns an Either value instead of raising an error if the archive cannot be decoded. NOTE: This function only works properly when the library is compiled against binary >= 0.7. With earlier versions, it will always return a Right value, raising an error if parsing fails.

fromArchive :: Archive -> ByteString #

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

filesInArchive :: Archive -> [FilePath] #

Returns a list of files in a zip archive.

addEntryToArchive :: Entry -> Archive -> Archive #

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

deleteEntryFromArchive :: FilePath -> Archive -> Archive #

Deletes an entry from a zip archive.

findEntryByPath :: FilePath -> Archive -> Maybe Entry #

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

fromEntry :: Entry -> ByteString #

Returns uncompressed contents of zip entry.

toEntry #

Arguments

:: 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 Entry #

Generates a Entry from a file or directory.

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

Writes contents of an Entry to a file. Throws a CRC32Mismatch exception if the CRC32 checksum for the entry does not match the uncompressed data.

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

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 () #

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.