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129 lines
4.9 KiB
Python
129 lines
4.9 KiB
Python
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"""
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ISO 9660 (cdrom) file system parser.
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Documents:
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- Standard ECMA-119 (december 1987)
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http://www.nondot.org/sabre/os/files/FileSystems/iso9660.pdf
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Author: Victor Stinner
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Creation: 11 july 2006
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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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UInt8, UInt32, UInt64, Enum,
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NullBytes, RawBytes, String)
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from hachoir.core.endian import LITTLE_ENDIAN, BIG_ENDIAN
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class PrimaryVolumeDescriptor(FieldSet):
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static_size = 2041 * 8
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def createFields(self):
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yield NullBytes(self, "unused[]", 1)
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yield String(self, "system_id", 32, "System identifier", strip=" ")
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yield String(self, "volume_id", 32, "Volume identifier", strip=" ")
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yield NullBytes(self, "unused[]", 8)
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yield UInt64(self, "space_size", "Volume space size")
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yield NullBytes(self, "unused[]", 32)
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yield UInt32(self, "set_size", "Volume set size")
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yield UInt32(self, "seq_num", "Sequence number")
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yield UInt32(self, "block_size", "Block size")
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yield UInt64(self, "path_table_size", "Path table size")
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yield UInt32(self, "occu_lpath", "Location of Occurrence of Type L Path Table")
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yield UInt32(self, "opt_lpath", "Location of Optional of Type L Path Table")
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yield UInt32(self, "occu_mpath", "Location of Occurrence of Type M Path Table")
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yield UInt32(self, "opt_mpath", "Location of Optional of Type M Path Table")
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yield RawBytes(self, "root", 34, "Directory Record for Root Directory")
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yield String(self, "vol_set_id", 128, "Volume set identifier", strip=" ")
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yield String(self, "publisher", 128, "Publisher identifier", strip=" ")
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yield String(self, "data_preparer", 128, "Data preparer identifier", strip=" ")
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yield String(self, "application", 128, "Application identifier", strip=" ")
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yield String(self, "copyright", 37, "Copyright file identifier", strip=" ")
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yield String(self, "abstract", 37, "Abstract file identifier", strip=" ")
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yield String(self, "biographic", 37, "Biographic file identifier", strip=" ")
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yield String(self, "creation_ts", 17, "Creation date and time", strip=" ")
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yield String(self, "modification_ts", 17, "Modification date and time", strip=" ")
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yield String(self, "expiration_ts", 17, "Expiration date and time", strip=" ")
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yield String(self, "effective_ts", 17, "Effective date and time", strip=" ")
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yield UInt8(self, "struct_ver", "Structure version")
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yield NullBytes(self, "unused[]", 1)
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yield String(self, "app_use", 512, "Application use", strip=" \0")
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yield NullBytes(self, "unused[]", 653)
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class BootRecord(FieldSet):
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static_size = 2041 * 8
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def createFields(self):
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yield String(self, "sys_id", 31, "Boot system identifier", strip="\0")
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yield String(self, "boot_id", 31, "Boot identifier", strip="\0")
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yield RawBytes(self, "system_use", 1979, "Boot system use")
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class Terminator(FieldSet):
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static_size = 2041 * 8
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def createFields(self):
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yield NullBytes(self, "null", 2041)
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class Volume(FieldSet):
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endian = BIG_ENDIAN
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TERMINATOR = 255
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type_name = {
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0: "Boot Record",
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1: "Primary Volume Descriptor",
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2: "Supplementary Volume Descriptor",
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3: "Volume Partition Descriptor",
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TERMINATOR: "Volume Descriptor Set Terminator",
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}
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static_size = 2048 * 8
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content_handler = {
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0: BootRecord,
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1: PrimaryVolumeDescriptor,
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TERMINATOR: Terminator,
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}
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def createFields(self):
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yield Enum(UInt8(self, "type", "Volume descriptor type"), self.type_name)
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yield RawBytes(self, "signature", 5, "ISO 9960 signature (CD001)")
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if self["signature"].value != b"CD001":
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raise ParserError("Invalid ISO 9960 volume signature")
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yield UInt8(self, "version", "Volume descriptor version")
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cls = self.content_handler.get(self["type"].value, None)
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if cls:
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yield cls(self, "content")
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else:
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yield RawBytes(self, "raw_content", 2048 - 7)
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class ISO9660(Parser):
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endian = LITTLE_ENDIAN
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MAGIC = b"\x01CD001"
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NULL_BYTES = 0x8000
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PARSER_TAGS = {
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"id": "iso9660",
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"category": "file_system",
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"description": "ISO 9660 file system",
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"min_size": (NULL_BYTES + 6) * 8,
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"magic": ((MAGIC, NULL_BYTES * 8),),
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}
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def validate(self):
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if self.stream.readBytes(self.NULL_BYTES * 8, len(self.MAGIC)) != self.MAGIC:
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return "Invalid signature"
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return True
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def createFields(self):
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yield self.seekByte(self.NULL_BYTES, null=True)
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while True:
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volume = Volume(self, "volume[]")
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yield volume
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if volume["type"].value == Volume.TERMINATOR:
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break
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if self.current_size < self._size:
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yield self.seekBit(self._size, "end")
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