CC-Archive

Various archiving/compression programs and libraries for ComputerCraft. All libraries should be loaded with require(). Everything in this repository is under public domain unless otherwise specified, though it would be nice if you link back to this repo if you use one of the libraries.

ar

Program & library for accessing *.a files. Uses System V/GNU-style archives.

Library

• table ar.load(string path): Loads an archive into a file.
  • path: The absolute path to an ar archive
  • Returns: A list of file entries with the format:
  • string name: The name of the file
  • number timestamp: The UNIX timestamp of the last modified time
  • number owner: The UID of the file owner
  • number group: The GID of the file owner
  • number mode: The octal file permissions of the file
  • string data: The actual file's data
• nil ar.write(table entry, string path): Writes an ar file entry to a file.
  • entry: A file entry as loaded with ar.load()
  • path: The absolute path to the output file
• nil ar.extract(table/string archive, string path): Writes an entire archive to a directory.
  • archive: Either an archive loaded with ar.load() or the absolute path to an archive
  • path: The absolute path to the output directory
• table ar.read(string path): Reads a file into an ar file entry.
  • path: The absolute path to the file to load
  • Returns: An ar file entry with the contents of the file
• table ar.pack(string path): Loads files in a directory into a list of ar entries.
  • path: The absolute path to the directory to load
  • Returns: A list of file entries that can be used by ar.save()
• nil ar.save(table data, string path): Writes a list of file entries to an ar archive.
  • data: The list of file entries to write
  • path: The absolute path of the ar file to save

    CLI

    Functions similarly to GNU/BSD ar, with the following options:

    commands:
    d            - delete file(s) from the archive
    p            - print file(s) found in the archive
    q            - quick append file(s) to the archive
    r            - replace existing or insert new file(s) into the archive
    t            - display contents of archive
    x            - extract file(s) from the archive
    modifiers:
    [c]          - do not warn if the library had to be created
    [T|f]        - truncate file
    [u]          - only replace files that are newer than current archive contents
    [v]          - be verbose

archive

Library for creating ComputerCraft-friendly archives.

Format

Archives are gzipped serialized Lua tables with the file name as the key and the file/directory data as the value. File data is represented by a string with the data while directory data is represented as a table with the same format as the root directory.

Archives returned by the library are represented as filesystem objects with the same methods as the fs library, with two extra methods: write(path) writes the archive to a file, and extract(path) extracts the file in the archive to a directory.

Library

• table archive.new(): Returns a new archive filesystem object.
• table archive.load(string path): Loads a directory into a new archive.
  • path: The absolute path to the directory to load
  • Returns: A new filesystem object with the contents of the directory
• table archive.read(string path): Reads an archive file into a new filesystem object.
  • path: The absolute path to the archive to load
  • Returns: A new filesystem object with the contents of the archive
• table archive([string path]): Chooses the most appropriate of the three functions above to use on the specified path.
  • path: The path to an archive or directory to load
  • Returns: If path is nil, returns archive.new(); if path points to a directory, returns archive.load(path); if path points to a file, returns archive.read(path)

arlib

Library for loading libraries from an ar archive.

Library

• boolean arlib.loadAPIs(string path, ...): Loads all libraries in an archive...? Not sure what this does exactly.
• any arlib.require(string path, string name): Loads a library from an archive using package.path.
  • path: A file name specifier for the archive to load. package.path will be used to find the correct path for the archive.
  • name: The name of the library to load from the archive, may or may not include extension
  • Returns: The return value of the loaded library, or nil if it couldn't be found

gzip

Program that implements GNU gzip in CC.

CLI

Usage: gzip [OPTION]... [FILE]
Compress or uncompress FILEs (by default, compress FILES in-place).

  -c, --stdout      write on standard output, keep original files unchanged
  -d, --decompress  decompress
  -f, --force       force overwrite of output file
  -h, --help        give this help
  -k, --keep        keep (don't delete) input files
  -l, --list        list compressed file contents
  -t, --test        test compressed file integrity
  -v, --verbose     verbose mode
  -V, --version     display version number
  -1, --fast        compress faster
  -9, --best        compress better

With no FILE, or when FILE is -, read standard input.

LibDeflate

Modified version of LibDeflate that works with ComputerCraft. See the official repo for more details.

muxzcat

Version of pts's muxzcat program ported to Lua. Decompresses XZ/LZMA files. Licensed under GPL v2.0 or later.

Library

• boolean, number muxzcat.DecompressXzOrLzmaFile(string/FILE input, string/FILE output): Decompresses files from/to disk.
  • input: Path or IO file to read from
  • output: Path or IO file to write to
  • Returns: Whether the task succeeded, and an error code if it failed
• string/nil, number muxzcat.DecompressXzOrLzmaString(string input): Decompresses XZ/LZMA data from a string.
  • input: Contents of file to decompress
  • Returns: The decompressed data, or nil on failure plus an error code
• string muxzcat.GetError(number code): Returns a somewhat human readable string for an error code.
  • code: The error code as returned from either decompress function
  • Returns: A short all-caps string that describes the error
• table muxzcat.Errors: Table mapping error strings to error codes.

tar

Program & library for accessing tar archives. Uses UStar-style archives.

Library

• table tar.load(string path[, boolean noser[, boolean rawdata]]): Loads a tar archive into a table.
  • path: The absolute path to a tar file, or the contents of a tar file if rawdata is set
  • noser: Set to true to not automatically unserialize tar entries
  • rawdata: Set to true to read raw archive data from path instead of from a file
  • Returns: Either a list of tar entries or a hierarchy of tar entries, depending on noser. A tar entry is in the format:
  • string name: The name of the file
  • number mode: The octal UNIX permissions of the file
  • number owner: The UID of the file owner
  • number group: The GID of the file owner
  • number timestamp: The UNIX timestamp of the file's modification data
  • number type: The type of file (0 = file, 5 = directory, others are irrelevant in CC)
  • string link: If the file is a link, the target of the link
  • string data: The actual file data
  • Extended attributes:
    • string ownerName: The username of the file owner
    • string groupName: The name of the group of the file owner
    • table deviceNumber: If the file is a device reference, a two-entry table with the device's major and minor IDs
• nil tar.extract(table data, string path): Extracts the contents of a tar hierarchy to a directory.
  • data: The tar archive to extract
  • path: The absolute path to the destination directory
• table tar.read(string base, string path): Reads a file into a tar entry.
  • base: The base directory to read from (this will not be stored in the archive)
  • path: The path to the file, relative to the base path (this will be stored)
  • Returns: A single tar entry with the contents of the file
• table tar.pack(string path): Reads a directory into a tar hierarchy.
  • base: The directory to read from
  • Returns: A hierarchical tar table with the contents of the directory
• nil tar.save(table data, string path[, boolean noser]): Saves tar entries to a tar archive.
  • data: The tar entries to save
  • path: The absolute path to the tar file to save to
  • noser: When false (or not present), data is a hierarchy; when true, data is a serialized list of entries
• table tar.unserialize(table data): Unserializes a list of tar entries into a hierarchy.
  • data: A list of tar entries
  • Returns: A hierarchical list of file/directory entries
• table tar.serialize(table data): Serializes a hierarchical table of tar entries into a list.
  • data: A hierarchy of tar entries
  • Returns: A list of tar entries

    CLI

    
    Usage: tar [OPTION...] [FILE]...
    CraftOS 'tar' saves many files together into a single tape or disk archive, and
    can restore individual files from the archive.

Examples: tar -cf archive.tar foo bar # Create archive.tar from files foo and bar. tar -tvf archive.tar # List all files in archive.tar verbosely. tar -xf archive.tar # Extract all files from archive.tar.

Local file name selection:

  --add-file=FILE        add given FILE to the archive (useful if its name
                         starts with a dash)

-C, --directory=DIR change to directory DIR --no-null disable the effect of the previous --null option --no-recursion avoid descending automatically in directories --null -T reads null-terminated names; implies --verbatim-files-from --recursion recurse into directories (default) -T, --files-from=FILE get names to extract or create from FILE

Main operation mode:

-A, --catenate, --concatenate append tar files to an archive -c, --create create a new archive -d, --diff, --compare find differences between archive and file system --delete delete from the archive (not on mag tapes!) -r, --append append files to the end of an archive -t, --list list the contents of an archive -u, --update only append files newer than copy in archive -x, --extract, --get extract files from an archive

Overwrite control:

-k, --keep-old-files don't replace existing files when extracting, treat them as errors --overwrite overwrite existing files when extracting --remove-files remove files after adding them to the archive -W, --verify attempt to verify the archive after writing it

Device selection and switching:

-f, --file=ARCHIVE use archive file or device ARCHIVE

Device blocking:

-i, --ignore-zeros ignore zeroed blocks in archive (means EOF)

Compression options:

-z, --gzip, --gunzip, --ungzip filter the archive through gzip

Local file selection:

-N, --newer=DATE-OR-FILE, --after-date=DATE-OR-FILE only store files newer than DATE-OR-FILE

Informative output:

-v, --verbose verbosely list files processed

Other options:

-?, --help give this help list --usage give a short usage message --version print program version

## unxz
Extracts an XZ file.
### CLI

Usage: unxz [OPTION]... [FILE]... Decompress FILEs in the .xz format.

-k, --keep keep (don't delete) input files -f, --force force overwrite of output file -c, --stdout write to standard output and don't delete input files -h, --help display this help and exit -V, --version display the version number and exit

Report bugs to https://github.com/MCJack123/CC-Archive/issues. Uses JackMacWindows's Lua port of muxzcat. Licensed under GPL v2.0.