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78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
"""
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Microsoft Windows Help (HLP) parser for Hachoir project.
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Documents:
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- Windows Help File Format / Annotation File Format / SHG and MRB File Format
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written by M. Winterhoff (100326.2776@compuserve.com)
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found on http://www.wotsit.org/
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Author: Victor Stinner
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Creation date: 2007-09-03
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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Bits, Int32, UInt16, UInt32,
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NullBytes, RawBytes, PaddingBytes, String)
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from hachoir.core.endian import LITTLE_ENDIAN
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from hachoir.core.text_handler import (textHandler, hexadecimal,
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displayHandler, humanFilesize)
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class FileEntry(FieldSet):
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def __init__(self, *args, **kw):
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FieldSet.__init__(self, *args, **kw)
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self._size = self["res_space"].value * 8
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def createFields(self):
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yield displayHandler(UInt32(self, "res_space", "Reserved space"), humanFilesize)
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yield displayHandler(UInt32(self, "used_space", "Used space"), humanFilesize)
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yield Bits(self, "file_flags", 8, "(=4)")
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yield textHandler(UInt16(self, "magic"), hexadecimal)
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yield Bits(self, "flags", 16)
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yield displayHandler(UInt16(self, "page_size", "Page size in bytes"), humanFilesize)
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yield String(self, "structure", 16, strip="\0", charset="ASCII")
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yield NullBytes(self, "zero", 2)
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yield UInt16(self, "nb_page_splits", "Number of page splits B+ tree has suffered")
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yield UInt16(self, "root_page", "Page number of B+ tree root page")
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yield PaddingBytes(self, "one", 2, pattern="\xFF")
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yield UInt16(self, "nb_page", "Number of B+ tree pages")
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yield UInt16(self, "nb_level", "Number of levels of B+ tree")
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yield UInt16(self, "nb_entry", "Number of entries in B+ tree")
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size = (self.size - self.current_size) // 8
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if size:
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yield PaddingBytes(self, "reserved_space", size)
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class HlpFile(Parser):
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PARSER_TAGS = {
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"id": "hlp",
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"category": "misc",
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"file_ext": ("hlp",),
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"min_size": 32,
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"description": "Microsoft Windows Help (HLP)",
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}
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endian = LITTLE_ENDIAN
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def validate(self):
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if self["magic"].value != 0x00035F3F:
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return "Invalid magic"
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if self["filesize"].value != self.stream.size // 8:
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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 textHandler(UInt32(self, "magic"), hexadecimal)
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yield UInt32(self, "dir_start", "Directory start")
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yield Int32(self, "first_free_block", "First free block")
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yield UInt32(self, "filesize", "File size in bytes")
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yield self.seekByte(self["dir_start"].value)
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yield FileEntry(self, "file[]")
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "end", size)
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