Module refinery.units.formats.archive.xtdmg

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from __future__ import annotations

from refinery.lib.dmg.arc import DiskImage, is_dmg
from refinery.units.formats.archive import ArchiveUnit


class xtdmg(ArchiveUnit, docs='{0}{p}{PathExtractorUnit}'):
    """
    Extract files from an Apple Disk Image (DMG) files with an HFS+ file system.
    """
    def unpack(self, data: bytearray):
        dmg = DiskImage(data)
        for result in dmg.files():
            for w in result.warnings:
                self.log_warn(w)
            if result.partition:
                continue
            yield self._pack(result.path, result.date, result.data)

    @classmethod
    def handles(cls, data) -> bool | None:
        return is_dmg(data)

Classes

class xtdmg (*paths, list=False, join_path=False, drop_path=False, fuzzy=0, exact=False, regex=False, path=b'path', exclude=None, date=b'date', pwd=b'')

Extract files from an Apple Disk Image (DMG) files with an HFS+ file system.

This unit extracts items with an associated virtual path from a container; each extracted item is emitted as a separate chunk with a corresponding meta variable named "path".

Positional arguments to xtdmg are patterns to filter the extracted items. Use the -x flag to add an exclusion pattern. To extract all files with a foo or bar extension, but none that has the word "temp" in its path:

xtdmg .foo .bar -x temp

To view only the paths of all chunks, use the listing switch:

emit data | ... | xtdmg -l

Otherwise, extracted items are written to the standard output port and usually require a frame to properly process. In order to dump all extracted data to disk, the following pipeline can be used:

emit data | ... | xtdmg [| dump extracted/{path} ]

The value {path} is a placeholder which is substituted by the virtual path of the extracted item. When using xtdmg to unpack a file on disk, the following pattern can be useful:

ef pack.bin [| xtdmg -j | d2p ]

The unit ef is also a path extractor. By specifying -j (or --join), the paths of extracted items are combined. Here, d2p is a shortcut for dump {path}. It deconflicts the joined paths with the local file system: If pack.bin contains items one.txt and two.txt, the following local file tree would be the result:

pack.bin
pack/one.txt
pack/two.txt

Finally, the -d (or --drop) switch can be used to not create (or alter) the path metadata at all, which is useful in cases where path metadata from a previous unit should be preserved.

Expand source code Browse git 
class xtdmg(ArchiveUnit, docs='{0}{p}{PathExtractorUnit}'):
    """
    Extract files from an Apple Disk Image (DMG) files with an HFS+ file system.
    """
    def unpack(self, data: bytearray):
        dmg = DiskImage(data)
        for result in dmg.files():
            for w in result.warnings:
                self.log_warn(w)
            if result.partition:
                continue
            yield self._pack(result.path, result.date, result.data)

    @classmethod
    def handles(cls, data) -> bool | None:
        return is_dmg(data)

Ancestors

Subclasses

Class variables

var reverse

The type of the None singleton.

Methods

def unpack(self, data)
Expand source code Browse git 
def unpack(self, data: bytearray):
    dmg = DiskImage(data)
    for result in dmg.files():
        for w in result.warnings:
            self.log_warn(w)
        if result.partition:
            continue
        yield self._pack(result.path, result.date, result.data)

Inherited members