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65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
"""MAR (Mozilla ARchive) parser
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Author: Robert Xiao
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Creation date: July 10, 2007
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"""
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.field import (RootSeekableFieldSet, FieldSet,
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String, CString, UInt32, RawBytes)
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from hachoir.core.text_handler import displayHandler, filesizeHandler
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from hachoir.core.tools import humanUnixAttributes
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from hachoir.parser import HachoirParser
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class IndexEntry(FieldSet):
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def createFields(self):
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yield UInt32(self, "offset", "Offset in bytes relative to start of archive")
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yield filesizeHandler(UInt32(self, "length", "Length in bytes"))
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yield displayHandler(UInt32(self, "flags"), humanUnixAttributes)
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yield CString(self, "name", "Filename (byte array)")
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def createDescription(self):
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return 'File %s, Size %s, Mode %s' % (
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self["name"].display, self["length"].display, self["flags"].display)
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class MozillaArchive(HachoirParser, RootSeekableFieldSet):
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MAGIC = b"MAR1"
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PARSER_TAGS = {
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"id": "mozilla_ar",
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"category": "archive",
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"file_ext": ("mar",),
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"min_size": (8 + 4 + 13) * 8, # Header, Index Header, 1 Index Entry
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"magic": ((MAGIC, 0),),
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"description": "Mozilla Archive",
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}
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endian = BIG_ENDIAN
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def __init__(self, stream, **args):
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RootSeekableFieldSet.__init__(
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self, None, "root", stream, None, stream.askSize(self))
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HachoirParser.__init__(self, stream, **args)
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def validate(self):
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if self.stream.readBytes(0, 4) != self.MAGIC:
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return "Invalid magic"
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return True
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def createFields(self):
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yield String(self, "magic", 4, "File signature (MAR1)", charset="ASCII")
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yield UInt32(self, "index_offset", "Offset to index relative to file start")
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self.seekByte(self["index_offset"].value, False)
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yield UInt32(self, "index_size", "size of index in bytes")
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current_index_size = 0 # bytes
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while current_index_size < self["index_size"].value:
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# plus 4 compensates for index_size
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self.seekByte(self["index_offset"].value +
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current_index_size + 4, False)
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entry = IndexEntry(self, "index_entry[]")
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yield entry
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current_index_size += entry.size // 8
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self.seekByte(entry["offset"].value, False)
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yield RawBytes(self, "file[]", entry["length"].value)
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