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980e05cc99
Backported 400 revisions from rev 1de4961-8897c5b (2018-2014). Move core/benchmark, core/cmd_line, core/memory, core/profiler and core/timeout to core/optional/* Remove metadata/qt* PORT: Version 2.0a3 (inline with 3.0a3 @ f80c7d5). Basic Support for XMP Packets. tga: improvements to adhere more closely to the spec. pdf: slightly improved parsing. rar: fix TypeError on unknown block types. Add MacRoman win32 codepage. tiff/exif: support SubIFDs and tiled images. Add method to export metadata in dictionary. mpeg_video: don't attempt to parse Stream past length. mpeg_video: parse ESCR correctly, add SCR value. Change centralise CustomFragments. field: don't set parser class if class is None, to enable autodetect. field: add value/display for CustomFragment. parser: inline warning to enable tracebacks in debug mode. Fix empty bytestrings in makePrintable. Fix contentSize in jpeg.py to account for image_data blocks. Fix the ELF parser. Enhance the AR archive parser. elf parser: fix wrong wrong fields order in parsing little endian section flags. elf parser: add s390 as a machine type. Flesh out mp4 parser. PORT: Version 2.0a1 (inline with 3.0a1). Major refactoring and PEP8. Fix ResourceWarning warnings on files. Add a close() method and support for the context manager protocol ("with obj: ...") to parsers, input and output streams. metadata: get comment from ZIP. Support for InputIOStream.read(0). Fix sizeGe when size is None. Remove unused new_seekable_field_set file. Remove parser Mapsforge .map. Remove parser Parallel Realities Starfighter .pak files. sevenzip: fix for newer archives. java: update access flags and modifiers for Java 1.7 and update description text for most recent Java. Support ustar prefix field in tar archives. Remove file_system* parsers. Remove misc parsers 3d0, 3ds, gnome_keyring, msoffice*, mstask, ole*, word*. Remove program parsers macho, nds, prc. Support non-8bit Character subclasses. Python parser supports Python 3.7. Enhance mpeg_ts parser to support MTS/M2TS. Support for creation date in tiff. Change don't hardcode errno constant. PORT: 1.9.1 Internal Only: The following are legacy reference to upstream commit messages. Relevant changes up to b0a115f8. Use integer division. Replace HACHOIR_ERRORS with Exception. Fix metadata.Data: make it sortable. Import fixes from e7de492. PORT: Version 2.0a1 (inline with 3.0a1 @ e9f8fad). Replace hachoir.core.field with hachoir.field Replace hachoir.core.stream with hachoir.stream Remove the compatibility module for PY1.5 to PY2.5. metadata: support TIFF picture. metadata: fix string normalization. metadata: fix datetime regex Fix hachoir bug #57. FileFromInputStream: fix comparison between None and an int. InputIOStream: open the file in binary mode.
76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
"""
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Very basic field: raw content with a size in byte. Use this class for
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unknown content.
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"""
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import types
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from hachoir.field import Field, FieldError
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from hachoir.core.tools import makePrintable
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from hachoir.core.bits import str2hex
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from hachoir.core import config
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MAX_LENGTH = (2 ** 64)
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class RawBytes(Field):
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"""
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Byte vector of unknown content
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@see: L{Bytes}
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"""
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static_size = staticmethod(lambda *args, **kw: args[1] * 8)
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def __init__(self, parent, name, length, description="Raw data"):
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assert issubclass(parent.__class__, Field)
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if not (0 < length <= MAX_LENGTH):
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raise FieldError("Invalid RawBytes length (%s)!" % length)
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Field.__init__(self, parent, name, length * 8, description)
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self._display = None
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def _createDisplay(self, human):
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max_bytes = config.max_byte_length
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if isinstance(self._getValue, types.FunctionType):
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display = makePrintable(self.value[:max_bytes], "ASCII")
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else:
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if self._display is None:
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address = self.absolute_address
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length = min(self._size // 8, max_bytes)
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self._display = self._parent.stream.readBytes(address, length)
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display = makePrintable(self._display, "ASCII")
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truncated = (8 * len(display) < self._size)
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if human:
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if truncated:
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display += "(...)"
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return makePrintable(display, "latin-1", quote='"', to_unicode=True)
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else:
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display = str2hex(display, format=r"\x%02x")
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if truncated:
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return '"%s(...)"' % display
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else:
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return '"%s"' % display
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def createDisplay(self):
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return self._createDisplay(True)
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def createRawDisplay(self):
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return self._createDisplay(False)
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def hasValue(self):
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return True
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def createValue(self):
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assert (self._size % 8) == 0
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if self._display:
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self._display = None
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return self._parent.stream.readBytes(
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self.absolute_address, self._size // 8)
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class Bytes(RawBytes):
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"""
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Byte vector: can be used for magic number or GUID/UUID for example.
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@see: L{RawBytes}
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"""
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pass
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