mirror of
https://github.com/SickGear/SickGear.git
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250 lines
9.3 KiB
Python
250 lines
9.3 KiB
Python
"""
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BZIP2 archive file
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Author: Victor Stinner, Robert Xiao
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"""
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from hachoir.parser import Parser
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from hachoir.core.tools import paddingSize
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from hachoir.field import (Field, FieldSet, GenericVector,
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ParserError, String,
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PaddingBits, Bit, Bits, Character,
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UInt32, Enum, CompressedField)
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.core.text_handler import textHandler, hexadecimal
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from hachoir.parser.archive.zlib import build_tree, HuffmanCode
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try:
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from bz2 import BZ2Decompressor
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class Bunzip2:
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def __init__(self, stream):
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self.bzip2 = BZ2Decompressor()
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def __call__(self, size, data=''):
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try:
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return self.bzip2.decompress(data)
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except EOFError:
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return ''
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has_deflate = True
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except ImportError:
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has_deflate = False
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class ZeroTerminatedNumber(Field):
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"""Zero (bit) terminated number: e.g. 11110 is 4."""
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def __init__(self, parent, name, description=None):
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Field.__init__(self, parent, name, 0, description)
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endian = self.parent.endian
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stream = self.parent.stream
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addr = self.absolute_address
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value = 0
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while True:
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bit = stream.readBits(addr, 1, endian)
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addr += 1
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self._size += 1
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if not bit:
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break
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value += 1
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self._value = value
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def createValue(self):
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return self._value
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def move_to_front(seq, index):
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seq[:] = seq[index:index + 1] + seq[0:index] + seq[index + 1:]
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class Bzip2Bitmap(FieldSet):
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def __init__(self, parent, name, nb_items, start_index, *args, **kwargs):
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FieldSet.__init__(self, parent, name, *args, **kwargs)
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self.nb_items = nb_items
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self.start_index = start_index
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def createFields(self):
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for i in range(self.start_index, self.start_index + self.nb_items):
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yield Bit(self, "symbol_used[%i]" % i, "Is the symbol %i (%r) used?" % (i, chr(i)))
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class Bzip2Lengths(FieldSet):
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def __init__(self, parent, name, symbols, *args, **kwargs):
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FieldSet.__init__(self, parent, name, *args, **kwargs)
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self.symbols = symbols
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def createFields(self):
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yield Bits(self, "start_length", 5)
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length = self["start_length"].value
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lengths = []
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for i in range(self.symbols):
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while True:
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bit = Bit(
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self, "change_length[%i][]" % i, "Should the length be changed for symbol %i?" % i)
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yield bit
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if not bit.value:
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break
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else:
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bit = Enum(Bit(self, "length_decrement[%i][]" % i, "Decrement the value?"), {
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True: "Decrement", False: "Increment"})
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yield bit
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if bit.value:
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length -= 1
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else:
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length += 1
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lengths.append(length)
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self.final_length = length
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self.tree = build_tree(lengths)
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class Bzip2Selectors(FieldSet):
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def __init__(self, parent, name, ngroups, *args, **kwargs):
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FieldSet.__init__(self, parent, name, *args, **kwargs)
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self.groups = list(range(ngroups))
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def createFields(self):
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for i in range(self["../selectors_used"].value):
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field = ZeroTerminatedNumber(self, "selector_list[]")
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move_to_front(self.groups, field.value)
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field.realvalue = self.groups[0]
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field._description = "MTF'ed selector index: raw value %i, real value %i" % (
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field.value, field.realvalue)
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yield field
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class Bzip2Block(FieldSet):
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def createFields(self):
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yield textHandler(Bits(self, "blockheader", 48, "Block header"), hexadecimal)
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if self["blockheader"].value != 0x314159265359: # pi
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raise ParserError("Invalid block header!")
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yield textHandler(UInt32(self, "crc32", "CRC32 for this block"), hexadecimal)
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yield Bit(self, "randomized", "Is this block randomized?")
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yield Bits(self, "orig_bwt_pointer", 24, "Starting pointer into BWT after untransform")
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yield GenericVector(self, "huffman_used_map", 16, Bit, 'block_used', "Bitmap showing which blocks (representing 16 literals each) are in use")
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symbols_used = []
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for index, block_used in enumerate(self["huffman_used_map"].array('block_used')):
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if block_used.value:
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start_index = index * 16
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field = Bzip2Bitmap(self, "huffman_used_bitmap[%i]" % index, 16, start_index, "Bitmap for block %i (literals %i to %i) showing which symbols are in use" % (
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index, start_index, start_index + 15))
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yield field
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for i, used in enumerate(field):
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if used.value:
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symbols_used.append(start_index + i)
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yield Bits(self, "huffman_groups", 3, "Number of different Huffman tables in use")
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yield Bits(self, "selectors_used", 15, "Number of times the Huffman tables are switched")
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yield Bzip2Selectors(self, "selectors_list", self["huffman_groups"].value)
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trees = []
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for group in range(self["huffman_groups"].value):
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field = Bzip2Lengths(self, "huffman_lengths[]",
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len(symbols_used) + 2)
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yield field
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trees.append(field.tree)
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counter = 0
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rle_run = 0
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selector_tree = None
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while True:
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if counter % 50 == 0:
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select_id = self["selectors_list"].array(
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"selector_list")[counter // 50].realvalue
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selector_tree = trees[select_id]
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field = HuffmanCode(self, "huffman_code[]", selector_tree)
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if field.realvalue in [0, 1]:
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# RLE codes
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if rle_run == 0:
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rle_power = 1
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rle_run += (field.realvalue + 1) * rle_power
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rle_power <<= 1
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field._description = "RLE Run Code %i (for %r); Total accumulated run %i (Huffman Code %i)" % (
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field.realvalue, chr(symbols_used[0]), rle_run, field.value)
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elif field.realvalue == len(symbols_used) + 1:
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field._description = "Block Terminator (%i) (Huffman Code %i)" % (
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field.realvalue, field.value)
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yield field
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break
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else:
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rle_run = 0
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move_to_front(symbols_used, field.realvalue - 1)
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field._description = "Literal %r (value %i) (Huffman Code %i)" % (
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chr(symbols_used[0]), field.realvalue, field.value)
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yield field
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if field.realvalue == len(symbols_used) + 1:
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break
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counter += 1
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class Bzip2Stream(FieldSet):
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START_BLOCK = 0x314159265359 # pi
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END_STREAM = 0x177245385090 # sqrt(pi)
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def createFields(self):
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end = False
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while not end:
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marker = self.stream.readBits(
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self.absolute_address + self.current_size, 48, self.endian)
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if marker == self.START_BLOCK:
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yield Bzip2Block(self, "block[]")
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elif marker == self.END_STREAM:
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yield textHandler(Bits(self, "stream_end", 48, "End-of-stream marker"), hexadecimal)
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yield textHandler(UInt32(self, "crc32", "CRC32 for entire stream"), hexadecimal)
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padding = paddingSize(self.current_size, 8)
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if padding:
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yield PaddingBits(self, "padding[]", padding)
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end = True
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else:
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raise ParserError("Invalid marker 0x%02X!" % marker)
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class Bzip2Parser(Parser):
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PARSER_TAGS = {
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"id": "bzip2",
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"category": "archive",
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"file_ext": ("bz2",),
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"mime": ("application/x-bzip2",),
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"min_size": 10 * 8,
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"magic": ((b'BZh', 0),),
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"description": "bzip2 archive"
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}
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endian = BIG_ENDIAN
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def validate(self):
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if self.stream.readBytes(0, 3) != b'BZh':
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return "Wrong file signature"
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if not("1" <= self["blocksize"].value <= "9"):
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return "Wrong blocksize"
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return True
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def createFields(self):
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yield String(self, "id", 3, "Identifier (BZh)", charset="ASCII")
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yield Character(self, "blocksize", "Block size (KB of memory needed to uncompress)")
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if self._size is None: # TODO: is it possible to handle piped input?
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raise NotImplementedError
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size = (self._size - self.current_size) // 8
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if size:
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for tag, filename in self.stream.tags:
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if tag == "filename" and filename.endswith(".bz2"):
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filename = filename[:-4]
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break
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else:
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filename = None
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data = Bzip2Stream(self, "file", size=size * 8)
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if has_deflate:
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CompressedField(self, Bunzip2)
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def createInputStream(**args):
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if filename:
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args.setdefault("tags", []).append(
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("filename", filename))
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return self._createInputStream(**args)
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data._createInputStream = createInputStream
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yield data
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