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56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
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"""
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GNU ar archive : archive file (.a) and Debian (.deb) archive.
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet, ParserError,
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String, RawBytes, UnixLine)
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from hachoir.core.endian import BIG_ENDIAN
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class ArchiveFileEntry(FieldSet):
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def createFields(self):
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yield UnixLine(self, "header", "Header")
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info = self["header"].value
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info = info.split()
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if len(info) < 3:
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raise ParserError("Invalid file entry header: %r" % info)
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size = int(info[-2])
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if 0 < size:
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yield RawBytes(self, "content", size, "File data")
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def createDescription(self):
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return "File entry (%s)" % self["header"].value.split()[0]
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class ArchiveFile(Parser):
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endian = BIG_ENDIAN
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MAGIC = b'!<arch>\n'
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PARSER_TAGS = {
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"id": "unix_archive",
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"category": "archive",
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"file_ext": ("a", "deb"),
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"mime":
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("application/x-debian-package",
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"application/x-archive",
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"application/x-dpkg"),
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"min_size": (8 + 13) * 8, # file signature + smallest file as possible
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"magic": ((MAGIC, 0),),
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"description": "Unix archive"
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}
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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 string"
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return True
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def createFields(self):
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yield String(self, "id", 8, "Unix archive identifier (\"<!arch>\")", charset="ASCII")
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while not self.eof:
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data = self.stream.readBytes(self.current_size, 1)
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if data == b"\n":
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yield RawBytes(self, "empty_line[]", 1, "Empty line")
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else:
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yield ArchiveFileEntry(self, "file[]", "File")
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