Shift pixels to the left to prepare for the next column. C A D B X

Test all the members in the archive. Returns the name of the first archive member with a failing header or content CRC, or None if a

Open the next volume following this one in a multi-volume archive and return the instantiated :class:`AceVolume` object.

Read the next data point from BitStream *bs* and store the resulting pixel X based on ErrContext *context*.

Using :class:`AceArchive` as a context manager ensures that :meth:`AceArchive.close` is called after leaving the block.

Compare the checksum to a fixed value or another ACE CRC32 object.

Format the checksum for printing.

Adding a buffer of bytes into the checksum, updating the rolling checksum from all previously added buffers.

Initialize decryption engine with a key derived from password *pwd*, which can be str or bytes.

Initialize and add bytes in *buf* into checksum.

Initialize BitStream reading from file-like object *f* until EOF.

Initialize a channel with index *channel_idx*, using symbol reader *symreader* to fetch new symbols.

Initialize an :class:`AceMember` object with index within archive *idx*, initial file header *filehdr* and underlying file-like objec

See :meth:`AceArchive._open`.

Using :class:`AceArchive` as an iterater will iterate over :class:`AceMember` objects for all archive members.

String representation of object is hex value of checksum.

String representation of object is hex value of checksum.

>>> a = list(range(9)) >>> _list_swap(a, 3, 6) [0, 1, 2, 6, 4, 5, 3, 7, 8, 9]

Open archive from *file*, which is either a filename or seekable file-like object, and return an instance of :class:`AceArchive`

Read the Huffman trees as well as the blocksize from BitStream *bs*; essentially this starts reading into a next block of sym

Return the ACE CRC-32 checksum of the bytes in *buf*. >>> ace_crc32(b"123456789") 873187033

ACE archive advert string as :class:`str`. Unregistered versions of ACE compressors communicate that they are unregistered by

Append output byte *char* to dictionary.

DOS/Windows file attribute bit field, as :class:`int`, as produced by the Windows :func:`GetFileAttributes` API.

Return the block size of the decryption engine in bytes. The decrypt() method will only accept buffers containing a multiple of

Decorator that adds the PIC dif_bit_width static table to *cls*.

Decorator that adds the PIC quantizer static tables to *cls*.

Decorator that adds the static quantizer table to class *cls*.

File-level comment, as :class:`str`. If absent, empty :class:`str`.

ACE archive level comment as :class:`str`. If absent, empty :class:`str`.

Compression quality used; one of :data:`QUAL_NONE`, :data:`QUAL_FASTEST`, :data:`QUAL_FAST`, :data:`QUAL_NORM

Compression type used; one of :data:`COMP_STORED`, :data:`COMP_LZ77` or :data:`COMP_BLOCKED`.

ACE creator version. This is equal to the major version of the ACE compressor used to create the archive, which equals the highest

Archive timestamp as :class:`datetime.datetime` object.

Decompress data compressed using the ACE 2.0 blocked method from file-like-object *f* containing compressed bytes that will be

Decompress data compressed using the ACE 1.0 legacy LZ77 method from file-like-object *f* containing compressed bytes that will be

Decompress data compressed using the store method from file-like-object *f* containing compressed bytes that will be decompressed to

LZ77 dictionary size required for extraction of this archive member in literal symbols, ranging from 1K to 4M.

LZ77 dictionary size bit length, i.e. the base-two logarithm of the dictionary size required for extraction of this archive member.

Dump all ACE file format headers in this archive and all its volumes to *file*.

ACE extractor version. This is the version of the ACE decompressor required to extract, which equals the version of the ACE format t

Extract *members* or all members from archive to *path* or the current working directory. *Members* can contain :class:`AceMe

Sanitized filename, as :class:`str`, safe for use with file operations on the current platform.

ACE archive filename. This is not a property of the archive but rather just the filename passed to :func:`acefile.open`.

Return True iff *file* refers to an ACE archive by filename or seekable file-like object. If *search* is 0, the archive must start at pos

Return True iff archive is locked for further modifications. Since this implementation does not support writing to archives,

True iff :class:`AceMember` instance describes a regular file.

NT security descriptor as :class:`bytes`, describing the owner, primary group and discretionary access control list (DACL) of the arc

Size before decompression (packed size).