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126 lines
4.5 KiB
Python
126 lines
4.5 KiB
Python
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"""
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Microsoft Cabinet (CAB) archive.
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Author: Victor Stinner
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Creation date: 31 january 2007
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"""
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from lib.hachoir_parser import Parser
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from lib.hachoir_core.field import (FieldSet, Enum,
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CString, String,
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UInt16, UInt32, Bit, Bits, PaddingBits, NullBits,
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DateTimeMSDOS32, RawBytes)
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from lib.hachoir_parser.common.msdos import MSDOSFileAttr16
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from lib.hachoir_core.text_handler import textHandler, hexadecimal, filesizeHandler
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from lib.hachoir_core.endian import LITTLE_ENDIAN
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MAX_NB_FOLDER = 30
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COMPRESSION_NONE = 0
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COMPRESSION_NAME = {
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0: "Uncompressed",
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1: "Deflate",
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2: "Quantum",
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3: "LZX",
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}
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class Folder(FieldSet):
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def createFields(self):
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yield UInt32(self, "off_data", "Offset of data")
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yield UInt16(self, "cf_data")
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yield Enum(Bits(self, "compr_method", 4, "Compression method"), COMPRESSION_NAME)
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yield Bits(self, "compr_level", 5, "Compression level")
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yield PaddingBits(self, "padding", 7)
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def createDescription(self):
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text= "Folder: compression %s" % self["compr_method"].display
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if self["compr_method"].value != COMPRESSION_NONE:
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text += " (level %u)" % self["compr_level"].value
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return text
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class File(FieldSet):
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def createFields(self):
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yield filesizeHandler(UInt32(self, "filesize", "Uncompressed file size"))
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yield UInt32(self, "offset", "File offset after decompression")
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yield UInt16(self, "iFolder", "file control id")
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yield DateTimeMSDOS32(self, "timestamp")
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yield MSDOSFileAttr16(self, "attributes")
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yield CString(self, "filename", charset="ASCII")
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def createDescription(self):
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return "File %s (%s)" % (
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self["filename"].display, self["filesize"].display)
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class Reserved(FieldSet):
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def createFields(self):
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yield UInt32(self, "size")
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size = self["size"].value
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if size:
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yield RawBytes(self, "data", size)
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class Flags(FieldSet):
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static_size = 16
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def createFields(self):
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yield Bit(self, "has_previous")
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yield Bit(self, "has_next")
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yield Bit(self, "has_reserved")
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yield NullBits(self, "padding", 13)
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class CabFile(Parser):
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endian = LITTLE_ENDIAN
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MAGIC = "MSCF"
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PARSER_TAGS = {
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"id": "cab",
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"category": "archive",
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"file_ext": ("cab",),
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"mime": (u"application/vnd.ms-cab-compressed",),
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"magic": ((MAGIC, 0),),
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"min_size": 1*8, # header + file entry
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"description": "Microsoft Cabinet archive"
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}
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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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if self["cab_version"].value != 0x0103:
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return "Unknown version (%s)" % self["cab_version"].display
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if not (1 <= self["nb_folder"].value <= MAX_NB_FOLDER):
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return "Invalid number of folder (%s)" % self["nb_folder"].value
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return True
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def createFields(self):
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yield String(self, "magic", 4, "Magic (MSCF)", charset="ASCII")
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yield textHandler(UInt32(self, "hdr_checksum", "Header checksum (0 if not used)"), hexadecimal)
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yield filesizeHandler(UInt32(self, "filesize", "Cabinet file size"))
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yield textHandler(UInt32(self, "fld_checksum", "Folders checksum (0 if not used)"), hexadecimal)
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yield UInt32(self, "off_file", "Offset of first file")
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yield textHandler(UInt32(self, "files_checksum", "Files checksum (0 if not used)"), hexadecimal)
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yield textHandler(UInt16(self, "cab_version", "Cabinet version"), hexadecimal)
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yield UInt16(self, "nb_folder", "Number of folders")
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yield UInt16(self, "nb_files", "Number of files")
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yield Flags(self, "flags")
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yield UInt16(self, "setid")
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yield UInt16(self, "number", "Zero-based cabinet number")
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# --- TODO: Support flags
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if self["flags/has_reserved"].value:
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yield Reserved(self, "reserved")
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#(3) Previous cabinet name, if CAB_HEADER.flags & CAB_FLAG_HASPREV
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#(4) Previous disk name, if CAB_HEADER.flags & CAB_FLAG_HASPREV
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#(5) Next cabinet name, if CAB_HEADER.flags & CAB_FLAG_HASNEXT
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#(6) Next disk name, if CAB_HEADER.flags & CAB_FLAG_HASNEXT
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# ----
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for index in xrange(self["nb_folder"].value):
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yield Folder(self, "folder[]")
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for index in xrange(self["nb_files"].value):
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yield File(self, "file[]")
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end = self.seekBit(self.size, "endraw")
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if end:
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yield end
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def createContentSize(self):
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return self["filesize"].value * 8
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