mirror of
https://github.com/SickGear/SickGear.git
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156 lines
4.8 KiB
Python
156 lines
4.8 KiB
Python
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"""
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ARJ archive file parser
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https://github.com/FarGroup/FarManager/blob/master/plugins/multiarc/arc.doc/arj.txt
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"""
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from hachoir.core.endian import LITTLE_ENDIAN
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from hachoir.field import (FieldSet, ParserError,
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CString, Enum, RawBytes,
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UInt8, UInt16, UInt32,
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Bytes)
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from hachoir.parser import Parser
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HOST_OS = {
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0: "MSDOS",
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1: "PRIMOS",
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2: "UNIX",
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3: "AMIGA",
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4: "MACDOS",
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5: "OS/2",
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6: "APPLE GS",
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7: "ATARI ST",
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8: "NEXT",
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9: "VAX VMS",
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10: "WIN95",
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11: "WIN32",
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}
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FILE_TYPE = {
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0: "BINARY",
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1: "TEXT",
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2: "COMMENT",
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3: "DIRECTORY",
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4: "VOLUME",
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5: "CHAPTER",
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}
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MAGIC = b"\x60\xEA"
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class BaseBlock(FieldSet):
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@property
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def isEmpty(self):
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return self["basic_header_size"].value == 0
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def _header_start_fields(self):
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yield Bytes(self, "magic", len(MAGIC))
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if self["magic"].value != MAGIC:
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raise ParserError("Wrong header magic")
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yield UInt16(self, "basic_header_size", "zero if end of archive")
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if not self.isEmpty:
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yield UInt8(self, "first_hdr_size")
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yield UInt8(self, "archiver_version")
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yield UInt8(self, "min_archiver_version")
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yield Enum(UInt8(self, "host_os"), HOST_OS)
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yield UInt8(self, "arj_flags")
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def _header_end_fields(self):
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yield UInt8(self, "last_chapter")
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fhs = self["first_hdr_size"]
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name_position = fhs.address // 8 + fhs.value
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current_position = self["last_chapter"].address // 8 + 1
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if name_position > current_position:
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yield RawBytes(self, "reserved2", name_position - current_position)
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yield CString(self, "filename", "File name", charset="ASCII")
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yield CString(self, "comment", "Comment", charset="ASCII")
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yield UInt32(self, "crc", "Header CRC")
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i = 0
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while not self.eof:
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yield UInt16(self, f"extended_header_size_{i}")
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cur_size = self[f"extended_header_size_{i}"].value
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if cur_size == 0:
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break
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yield RawBytes(self, "extended_header_data", cur_size)
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yield UInt32(self, f"extended_header_crc_{i}")
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i += 1
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def validate(self):
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if self.stream.readBytes(0, 2) != MAGIC:
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return "Invalid magic"
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return True
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class Header(BaseBlock):
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def createFields(self):
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yield from self._header_start_fields()
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if not self.isEmpty:
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yield UInt8(self, "security_version")
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yield Enum(UInt8(self, "file_type"), FILE_TYPE)
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yield UInt8(self, "reserved")
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yield UInt32(self, "date_time_created")
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yield UInt32(self, "date_time_modified")
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yield UInt32(self, "archive_size")
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yield UInt32(self, "security_envelope_file_position")
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yield UInt16(self, "filespec_position")
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yield UInt16(self, "security_envelope_data_len")
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yield UInt8(self, "encryption_version")
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yield from self._header_end_fields()
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def createDescription(self):
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if self.isEmpty:
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return "Empty main header"
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return "Main header of '%s'" % self["filename"].value
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class Block(BaseBlock):
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def createFields(self):
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yield from self._header_start_fields()
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if not self.isEmpty:
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yield UInt8(self, "method")
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yield Enum(UInt8(self, "file_type"), FILE_TYPE)
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yield UInt8(self, "reserved")
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yield UInt32(self, "date_time_modified")
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yield UInt32(self, "compressed_size")
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yield UInt32(self, "original_size")
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yield UInt32(self, "original_file_crc")
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yield UInt16(self, "filespec_position")
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yield UInt16(self, "file_access_mode")
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yield UInt8(self, "first_chapter")
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yield from self._header_end_fields()
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compressed_size = self["compressed_size"].value
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if compressed_size > 0:
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yield RawBytes(self, "compressed_data", compressed_size)
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def createDescription(self):
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if self.isEmpty:
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return "Empty file header"
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return "File header of '%s'" % self["filename"].value
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class ArjParser(Parser):
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endian = LITTLE_ENDIAN
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PARSER_TAGS = {
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"id": "arj",
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"category": "archive",
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"file_ext": ("arj",),
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"min_size": 4 * 8,
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"description": "ARJ archive"
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}
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def validate(self):
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if self.stream.readBytes(0, 2) != 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 Header(self, "header")
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if not self["header"].isEmpty:
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while not self.eof:
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block = Block(self, "file_header[]")
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yield block
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if block.isEmpty:
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break
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