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96 lines
3 KiB
Python
96 lines
3 KiB
Python
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"""
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Apple BOMStorage parser.
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Used for Assets.Bom files by Interface Builder, and for .bom files by Installer.app.
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Documents:
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Author: Robert Xiao
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Created: 2015-05-14
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"""
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from hachoir.parser import HachoirParser
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from hachoir.field import (RootSeekableFieldSet, FieldSet,
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UInt32, Bytes, NullBytes, RawBytes)
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from hachoir.core.endian import BIG_ENDIAN
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class BomTrailerEntry(FieldSet):
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static_size = 64 # bits
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def createFields(self):
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yield UInt32(self, "offset")
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yield UInt32(self, "size")
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def createDescription(self):
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return "Object at offset %d, size %d" % (self['offset'].value, self['size'].value)
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class BomTrailer(FieldSet):
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def createFields(self):
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yield UInt32(self, "num_spaces", "Total number of entries, including blank entries")
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nobj = self['/num_objects'].value
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nspace = self['num_spaces'].value
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for i in range(nobj + 1):
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yield BomTrailerEntry(self, "entry[]")
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yield NullBytes(self, "blank_entries", (nspace - nobj - 1) * (BomTrailerEntry.static_size // 8))
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yield UInt32(self, "num_trail")
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ntrail = self['num_trail'].value
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for i in range(ntrail):
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yield BomTrailerEntry(self, "trail[]")
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def createDescription(self):
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return "Bom file trailer"
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class BomFile(HachoirParser, RootSeekableFieldSet):
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endian = BIG_ENDIAN
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MAGIC = b"BOMStore"
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PARSER_TAGS = {
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"id": "bom_store",
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"category": "archive",
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"file_ext": ("bom", "car"),
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"magic": ((MAGIC, 0),),
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"min_size": 32 * 8, # 32-byte header
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"description": "Apple bill-of-materials file",
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}
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def __init__(self, stream, **args):
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RootSeekableFieldSet.__init__(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, len(self.MAGIC)) != 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 Bytes(self, "magic", 8, "File magic (BOMStore)")
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yield UInt32(self, "version") # ?
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yield UInt32(self, "num_objects")
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yield UInt32(self, "trailer_offset")
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yield UInt32(self, "trailer_size")
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yield UInt32(self, "header_offset")
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yield UInt32(self, "header_size")
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yield RawBytes(self, "object[]", 512 - 32, "Null object (size 0, offset 0)")
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self.seekByte(self['trailer_offset'].value)
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yield BomTrailer(self, "trailer")
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self.seekByte(self['header_offset'].value)
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yield RawBytes(self, "header", self['header_size'].value)
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for entry in self['trailer'].array('entry'):
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if entry['size'].value == 0:
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continue
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self.seekByte(entry['offset'].value)
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yield RawBytes(self, "object[]", entry['size'].value)
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for entry in self['trailer'].array('trail'):
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self.seekByte(entry['offset'].value)
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yield RawBytes(self, "trail[]", entry['size'].value)
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