mirror of
https://github.com/SickGear/SickGear.git
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e56303798c
Initial SickGear for Python 3.
410 lines
15 KiB
Python
410 lines
15 KiB
Python
"""
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String field classes:
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- String: Fixed length string (no prefix/no suffix) ;
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- CString: String which ends with nul byte ("\0") ;
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- UnixLine: Unix line of text, string which ends with "\n" ;
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- PascalString8, PascalString16, PascalString32: String prefixed with
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length written in a 8, 16, 32-bit integer (use parent endian).
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Constructor has optional arguments:
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- strip: value can be a string or True ;
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- charset: if set, convert string to unicode using this charset (in "replace"
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mode which replace all buggy characters with ".").
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Note: For PascalStringXX, prefixed value is the number of bytes and not
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of characters!
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"""
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from hachoir.field import FieldError, Bytes
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from hachoir.core.endian import LITTLE_ENDIAN, BIG_ENDIAN
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from hachoir.core.tools import alignValue, makePrintable
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from hachoir.core.i18n import guessBytesCharset
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from hachoir.core import config
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from codecs import BOM_UTF16_LE, BOM_UTF16_BE, BOM_UTF32_LE, BOM_UTF32_BE
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# Default charset used to convert byte string to Unicode
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# This charset is used if no charset is specified or on conversion error
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FALLBACK_CHARSET = "ISO-8859-1"
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class GenericString(Bytes):
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"""
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Generic string class.
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charset have to be in CHARSET_8BIT or in UTF_CHARSET.
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"""
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VALID_FORMATS = ("C", "UnixLine",
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"fixed", "Pascal8", "Pascal16", "Pascal32")
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# 8-bit charsets
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CHARSET_8BIT = set((
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"ASCII", # ANSI X3.4-1968
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"MacRoman",
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"CP037", # EBCDIC 037
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"CP874", # Thai
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"WINDOWS-1250", # Central Europe
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"WINDOWS-1251", # Cyrillic
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"WINDOWS-1252", # Latin I
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"WINDOWS-1253", # Greek
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"WINDOWS-1254", # Turkish
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"WINDOWS-1255", # Hebrew
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"WINDOWS-1256", # Arabic
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"WINDOWS-1257", # Baltic
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"WINDOWS-1258", # Vietnam
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"ISO-8859-1", # Latin-1
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"ISO-8859-2", # Latin-2
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"ISO-8859-3", # Latin-3
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"ISO-8859-4", # Latin-4
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"ISO-8859-5",
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"ISO-8859-6",
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"ISO-8859-7",
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"ISO-8859-8",
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"ISO-8859-9", # Latin-5
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"ISO-8859-10", # Latin-6
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"ISO-8859-11", # Thai
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"ISO-8859-13", # Latin-7
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"ISO-8859-14", # Latin-8
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"ISO-8859-15", # Latin-9 or ("Latin-0")
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"ISO-8859-16", # Latin-10
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))
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# UTF-xx charset familly
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UTF_CHARSET = {
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"UTF-8": (8, None),
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"UTF-16-LE": (16, LITTLE_ENDIAN),
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"UTF-32LE": (32, LITTLE_ENDIAN),
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"UTF-16-BE": (16, BIG_ENDIAN),
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"UTF-32BE": (32, BIG_ENDIAN),
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"UTF-16": (16, "BOM"),
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"UTF-32": (32, "BOM"),
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}
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# UTF-xx BOM => charset with endian
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UTF_BOM = {
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16: {BOM_UTF16_LE: "UTF-16-LE", BOM_UTF16_BE: "UTF-16-BE"},
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32: {BOM_UTF32_LE: "UTF-32LE", BOM_UTF32_BE: "UTF-32BE"},
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}
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# Suffix format: value is suffix (string)
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SUFFIX_FORMAT = {
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"C": {
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8: {LITTLE_ENDIAN: b"\0", BIG_ENDIAN: b"\0"},
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16: {LITTLE_ENDIAN: b"\0\0", BIG_ENDIAN: b"\0\0"},
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32: {LITTLE_ENDIAN: b"\0\0\0\0", BIG_ENDIAN: b"\0\0\0\0"},
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},
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"UnixLine": {
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8: {LITTLE_ENDIAN: b"\n", BIG_ENDIAN: b"\n"},
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16: {LITTLE_ENDIAN: b"\n\0", BIG_ENDIAN: b"\0\n"},
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32: {LITTLE_ENDIAN: b"\n\0\0\0", BIG_ENDIAN: b"\0\0\0\n"},
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},
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}
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# Pascal format: value is the size of the prefix in bits
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PASCAL_FORMATS = {
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"Pascal8": 1,
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"Pascal16": 2,
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"Pascal32": 4
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}
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# Raw value: with prefix and suffix, not stripped,
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# and not converted to Unicode
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_raw_value = None
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def __init__(self, parent, name, format, description=None,
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strip=None, charset=None, nbytes=None, truncate=None):
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Bytes.__init__(self, parent, name, 1, description)
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# Is format valid?
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assert format in self.VALID_FORMATS
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# Store options
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self._format = format
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self._strip = strip
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self._truncate = truncate
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# Check charset and compute character size in bytes
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# (or None when it's not possible to guess character size)
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if not charset or charset in self.CHARSET_8BIT:
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self._character_size = 1 # one byte per character
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elif charset in self.UTF_CHARSET:
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self._character_size = None
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else:
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raise FieldError("Invalid charset for %s: \"%s\"" %
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(self.path, charset))
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self._charset = charset
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# It is a fixed string?
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if nbytes is not None:
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assert self._format == "fixed"
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# Arbitrary limits, just to catch some bugs...
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if not (1 <= nbytes <= 0xffff):
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raise FieldError("Invalid string size for %s: %s" %
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(self.path, nbytes))
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self._content_size = nbytes # content length in bytes
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self._size = nbytes * 8
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self._content_offset = 0
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else:
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# Format with a suffix: Find the end of the string
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if self._format in self.SUFFIX_FORMAT:
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self._content_offset = 0
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# Choose the suffix
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suffix = self.suffix_str
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# Find the suffix
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length = self._parent.stream.searchBytesLength(
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suffix, False, self.absolute_address)
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if length is None:
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raise FieldError("Unable to find end of string %s (format %s)!"
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% (self.path, self._format))
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if 1 < len(suffix):
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# Fix length for little endian bug with UTF-xx charset:
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# u"abc" -> "a\0b\0c\0\0\0" (UTF-16-LE)
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# search returns length=5, whereas real lenght is 6
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length = alignValue(length, len(suffix))
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# Compute sizes
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self._content_size = length # in bytes
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self._size = (length + len(suffix)) * 8
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# Format with a prefix: Read prefixed length in bytes
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else:
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assert self._format in self.PASCAL_FORMATS
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# Get the prefix size
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prefix_size = self.PASCAL_FORMATS[self._format]
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self._content_offset = prefix_size
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# Read the prefix and compute sizes
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value = self._parent.stream.readBits(
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self.absolute_address, prefix_size * 8, self._parent.endian)
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self._content_size = value # in bytes
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self._size = (prefix_size + value) * 8
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# For UTF-16 and UTF-32, choose the right charset using BOM
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if self._charset in self.UTF_CHARSET:
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# Charset requires a BOM?
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bomsize, endian = self.UTF_CHARSET[self._charset]
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if endian == "BOM":
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# Read the BOM value
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nbytes = bomsize // 8
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bom = self._parent.stream.readBytes(
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self.absolute_address, nbytes)
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# Choose right charset using the BOM
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bom_endian = self.UTF_BOM[bomsize]
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if bom not in bom_endian:
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raise FieldError("String %s has invalid BOM (%s)!"
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% (self.path, repr(bom)))
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self._charset = bom_endian[bom]
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self._content_size -= nbytes
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self._content_offset += nbytes
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# Compute length in character if possible
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if self._character_size:
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self._length = self._content_size // self._character_size
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else:
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self._length = None
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@staticmethod
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def staticSuffixStr(format, charset, endian):
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if format not in GenericString.SUFFIX_FORMAT:
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return ''
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suffix = GenericString.SUFFIX_FORMAT[format]
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if charset in GenericString.UTF_CHARSET:
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suffix_size = GenericString.UTF_CHARSET[charset][0]
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suffix = suffix[suffix_size]
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else:
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suffix = suffix[8]
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return suffix[endian]
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def _getSuffixStr(self):
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return self.staticSuffixStr(
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self._format, self._charset, self._parent.endian)
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suffix_str = property(_getSuffixStr)
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def _convertText(self, text):
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if not self._charset:
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# charset is still unknown: guess the charset
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self._charset = guessBytesCharset(text, default=FALLBACK_CHARSET)
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# Try to convert to Unicode
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try:
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return str(text, self._charset, "strict")
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except UnicodeDecodeError as exc:
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err = exc
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# --- Conversion error ---
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# Fix truncated UTF-16 string like 'B\0e' (3 bytes)
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# => Add missing nul byte: 'B\0e\0' (4 bytes)
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if err.reason == "truncated data" \
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and err.end == len(text) \
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and self._charset == "UTF-16-LE":
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try:
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text = str(text + "\0", self._charset, "strict")
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self.warning(
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"Fix truncated %s string: add missing nul byte" % self._charset)
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return text
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except UnicodeDecodeError:
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pass
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# On error, use FALLBACK_CHARSET
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self.warning("Unable to convert string to Unicode: %s" % err)
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return str(text, FALLBACK_CHARSET, "strict")
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def _guessCharset(self):
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addr = self.absolute_address + self._content_offset * 8
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bytes = self._parent.stream.readBytes(addr, self._content_size)
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return guessBytesCharset(bytes, default=FALLBACK_CHARSET)
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def createValue(self, human=True):
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# Compress data address (in bits) and size (in bytes)
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if human:
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addr = self.absolute_address + self._content_offset * 8
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size = self._content_size
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else:
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addr = self.absolute_address
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size = self._size // 8
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if size == 0:
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# Empty string
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return ""
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# Read bytes in data stream
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text = self._parent.stream.readBytes(addr, size)
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# Don't transform data?
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if not human:
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return text
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# Convert text to Unicode
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text = self._convertText(text)
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# Truncate
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if self._truncate:
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pos = text.find(self._truncate)
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if 0 <= pos:
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text = text[:pos]
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# Strip string if needed
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if self._strip:
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if isinstance(self._strip, str):
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text = text.strip(self._strip)
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else:
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text = text.strip()
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assert isinstance(text, str)
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return text
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def createDisplay(self, human=True):
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if not human:
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if self._raw_value is None:
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self._raw_value = GenericString.createValue(self, False)
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value = makePrintable(self._raw_value, "ASCII")
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elif self._charset:
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value = makePrintable(self.value, "ISO-8859-1")
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else:
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value = self.value
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if config.max_string_length < len(value):
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# Truncate string if needed
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value = "%s(...)" % value[:config.max_string_length]
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if not self._charset or not human:
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return makePrintable(value, "ASCII", quote='"')
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else:
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if value:
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return '"%s"' % value.replace('"', '\\"')
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else:
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return "(empty)"
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def createRawDisplay(self):
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return GenericString.createDisplay(self, human=False)
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def _getLength(self):
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if self._length is None:
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self._length = len(self.value)
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return self._length
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length = property(_getLength, doc="String length in characters")
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def _getFormat(self):
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return self._format
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format = property(_getFormat, doc="String format (eg. 'C')")
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def _getCharset(self):
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if not self._charset:
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self._charset = self._guessCharset()
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return self._charset
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charset = property(_getCharset, doc="String charset (eg. 'ISO-8859-1')")
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def _getContentSize(self):
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return self._content_size
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content_size = property(_getContentSize, doc="Content size in bytes")
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def _getContentOffset(self):
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return self._content_offset
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content_offset = property(_getContentOffset, doc="Content offset in bytes")
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def getFieldType(self):
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info = self.charset
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if self._strip:
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if isinstance(self._strip, str):
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info += ",strip=%s" % makePrintable(
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self._strip, "ASCII", quote="'")
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else:
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info += ",strip=True"
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return "%s<%s>" % (Bytes.getFieldType(self), info)
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def stringFactory(name, format, doc):
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class NewString(GenericString):
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__doc__ = doc
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def __init__(self, parent, name, description=None,
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strip=None, charset=None, truncate=None):
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GenericString.__init__(self, parent, name, format, description,
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strip=strip, charset=charset, truncate=truncate)
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cls = NewString
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cls.__name__ = name
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return cls
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# String which ends with nul byte ("\0")
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CString = stringFactory("CString", "C",
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r"""C string: string ending with nul byte.
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See GenericString to get more information.""")
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# Unix line of text: string which ends with "\n" (ASCII 0x0A)
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UnixLine = stringFactory("UnixLine", "UnixLine",
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r"""Unix line: string ending with "\n" (ASCII code 10).
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See GenericString to get more information.""")
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# String prefixed with length written in a 8-bit integer
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PascalString8 = stringFactory("PascalString8", "Pascal8",
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r"""Pascal string: string prefixed with 8-bit integer containing its length (endian depends on parent endian).
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See GenericString to get more information.""")
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# String prefixed with length written in a 16-bit integer (use parent endian)
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PascalString16 = stringFactory("PascalString16", "Pascal16",
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r"""Pascal string: string prefixed with 16-bit integer containing its length (endian depends on parent endian).
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See GenericString to get more information.""")
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# String prefixed with length written in a 32-bit integer (use parent endian)
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PascalString32 = stringFactory("PascalString32", "Pascal32",
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r"""Pascal string: string prefixed with 32-bit integer containing its length (endian depends on parent endian).
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See GenericString to get more information.""")
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class String(GenericString):
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"""
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String with fixed size (size in bytes).
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See GenericString to get more information.
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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, nbytes, description=None,
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strip=None, charset=None, truncate=None):
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GenericString.__init__(self, parent, name, "fixed", description,
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strip=strip, charset=charset, nbytes=nbytes, truncate=truncate)
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String.__name__ = "FixedString"
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