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Pack prolog_library_collection -- prolog/archive_ext.pl
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This module extends the support for archives in the SWI-Prolog standard library.

 archive_call(+In:istream, :Goal_2) is multi
Calls `Goal_2' on a decompressed input stream that is present in the encoded input stream `In' and the metadata object `Metas'.

Supports non-deterministically iterating over all archive members.

Uses archive_open/2 to automatically process all supporter archive filters and formats.

 archive_extension(+Extension:atom) is semidet
archive_extension(-Extension:atom) is multi
Uses the Media Type library in order to determine whether a given `Extension' is commonly used to denote an archive file.

Can also be used to enumerate such known file name extensions.

 archive_media_type(+MediaType:media_type) is semidet
archive_media_type(-MediaType:media_type) is multi
Succeeds for all and only those Media Types that denote an archive format. These are recorded in the Media Type library.
 archive_open(+In:istream, -Archive:blob) is det
Tries to open an archive of any of the supported formats, using any of the supported filters, from the input stream In.
 archive_stream(+In1:istream, -In2:istream) is det

Re-exported predicates

The following predicates are re-exported from other modules

 archive_open(+Data, -Archive, +Options) is det
Wrapper around archive_open/4 that opens the archive in read mode.
 archive_open(+Data, +Mode, -Archive, +Options) is det
Open the archive in Data and unify Archive with a handle to the opened archive. Data is either a file or a stream that contains a valid archive. Details are controlled by Options. Typically, the option close_parent(true) is used to close stream if the archive is closed using archive_close/1. For other options, the defaults are typically fine. The option format(raw) must be used to process compressed streams that do not contain explicit entries (e.g., gzip'ed data) unambibuously. The raw format creates a pseudo archive holding a single member named data.
close_parent(+Boolean)
If this option is true (default false), Stream is closed if archive_close/1 is called on Archive.
compression(+Compression)
Synomym for filter(Compression). Deprecated.
filter(+Filter)
Support the indicated filter. This option may be used multiple times to support multiple filters. In read mode, If no filter options are provided, all is assumed. In write mode, none is assumed. Supported values are all, bzip2, compress, gzip, grzip, lrzip, lzip, lzma, lzop, none, rpm, uu and xz. The value all is default for read, none for write.
format(+Format)
Support the indicated format. This option may be used multiple times to support multiple formats in read mode. In write mode, you must supply a single format. If no format options are provided, all is assumed for read mode. Note that all does not include raw and mtree. To open both archive and non-archive files, both format(all) and format(raw) and/or format(mtree) must be specified. Supported values are: all, 7zip, ar, cab, cpio, empty, gnutar, iso9660, lha, mtree, rar, raw, tar, xar and zip. The value all is default for read.

Note that the actually supported compression types and formats may vary depending on the version and installation options of the underlying libarchive library. This predicate raises a domain error if the (explicitly) requested format is not supported.

Errors
- domain_error(filter, Filter) if the requested filter is not supported.
- domain_error(format, Format) if the requested format type is not supported.
 archive_create(+OutputFile, +InputFiles, +Options) is det
Convenience predicate to create an archive in OutputFile with data from a list of InputFiles and the given Options.

Besides options supported by archive_open/4, the following options are supported:

directory(+Directory)
Changes the directory before adding input files. If this is specified, paths of input files must be relative to Directory and archived files will not have Directory as leading path. This is to simulate -C option of the tar program.
format(+Format)
Write mode supports the following formats: `7zip, cpio, gnutar, iso9660, xar and zip`. Note that a particular installation may support only a subset of these, depending on the configuration of libarchive.
 archive_close(+Archive) is det
Close the archive. If close_parent(true) is specified, the underlying stream is closed too. If there is an entry opened with archive_open_entry/2, actually closing the archive is delayed until the stream associated with the entry is closed. This can be used to open a stream to an archive entry without having to worry about closing the archive:
archive_open_named(ArchiveFile, EntryName, Stream) :-
    archive_open(ArchiveFile, Handle, []),
    archive_next_header(Handle, Name),
    archive_open_entry(Handle, Stream),
    archive_close(Archive).
 archive_property(+Handle, ?Property) is nondet
True when Property is a property of the archive Handle. Defined properties are:
filters(List)
True when the indicated filters are applied before reaching the archive format.
 archive_next_header(+Handle, -Name) is semidet
Forward to the next entry of the archive for which Name unifies with the pathname of the entry. Fails silently if the name of the archive is reached before success. Name is typically specified if a single entry must be accessed and unbound otherwise. The following example opens a Prolog stream to a given archive entry. Note that Stream must be closed using close/1 and the archive must be closed using archive_close/1 after the data has been used. See also setup_call_cleanup/3.
open_archive_entry(ArchiveFile, Entry, Stream) :-
    open(ArchiveFile, read, In, [type(binary)]),
    archive_open(In, Archive, [close_parent(true)]),
    archive_next_header(Archive, Entry),
    archive_open_entry(Archive, Stream).
Errors
- permission_error(next_header, archive, Handle) if a previously opened entry is not closed.
 archive_open_entry(+Archive, -Stream) is det
Open the current entry as a stream. Stream must be closed. If the stream is not closed before the next call to archive_next_header/2, a permission error is raised.
 archive_header_property(+Archive, ?Property)
True when Property is a property of the current header. Defined properties are:
filetype(-Type)
Type is one of file, link, socket, character_device, block_device, directory or fifo. It appears that this library can also return other values. These are returned as an integer.
mtime(-Time)
True when entry was last modified at time.
size(-Bytes)
True when entry is Bytes long.
link_target(-Target)
Target for a link. Currently only supported for symbolic links.
format(-Format)
Provides the name of the archive format applicable to the current entry. The returned value is the lowercase version of the output of archive_format_name().
permissions(-Integer)
True when entry has the indicated permission mask.
 archive_set_header_property(+Archive, +Property)
Set Property of the current header. Write-mode only. Defined properties are:
filetype(-Type)
Type is one of file, link, socket, character_device, block_device, directory or fifo. It appears that this library can also return other values. These are returned as an integer.
mtime(-Time)
True when entry was last modified at time.
size(-Bytes)
True when entry is Bytes long.
link_target(-Target)
Target for a link. Currently only supported for symbolic links.
 archive_extract(+ArchiveFile, +Dir, +Options)
Extract files from the given archive into Dir. Supported options:
remove_prefix(+Prefix)
Strip Prefix from all entries before extracting. If Prefix is a list, then each prefix is tried in order, succeding at the first one that matches. If no prefixes match, an error is reported. If Prefix is an atom, then that prefix is removed.
exclude(+ListOfPatterns)
Ignore members that match one of the given patterns. Patterns are handed to wildcard_match/2.
include(+ListOfPatterns)
Include members that match one of the given patterns. Patterns are handed to wildcard_match/2. The exclude options takes preference if a member matches both the include and the exclude option.
Errors
- existence_error(directory, Dir) if Dir does not exist or is not a directory.
- domain_error(path_prefix(Prefix), Path) if a path in the archive does not start with Prefix
To be done
- Add options
 archive_entries(+Archive, -Paths) is det
True when Paths is a list of pathnames appearing in Archive.
 archive_data_stream(+Archive, -DataStream, +Options) is nondet
True when DataStream is a stream to a data object inside Archive. This predicate transparently unpacks data inside possibly nested archives, e.g., a tar file inside a zip file. It applies the appropriate decompression filters and thus ensures that Prolog reads the plain data from DataStream. DataStream must be closed after the content has been processed. Backtracking opens the next member of the (nested) archive. This predicate processes the following options:
meta_data(-Data:list(dict))
If provided, Data is unified with a list of filters applied to the (nested) archive to open the current DataStream. The first element describes the outermost archive. Each Data dict contains the header properties (archive_header_property/2) as well as the keys:
filters(Filters:list(atom))
Filter list as obtained from archive_property/2
name(Atom)
Name of the entry.

Non-archive files are handled as pseudo-archives that hold a single stream. This is implemented by using archive_open/3 with the options [format(all),format(raw)].

 archive_foldl(:Goal, +Archive, +State0, -State)
Operates like foldl/4 but for the entries in the archive. For each member of the archive, Goal called as `call(:Goal, +Path, +Handle, +S0, -S1). Here, S0 is current state of the accumulator (starting with State0) and S1 is the next state of the accumulator, producing State after the last member of the archive.
Arguments:
Archive- File name or stream to be given to archive_open/[3,4].
See also
- archive_header_property/2, archive_open/4.