mirror of
https://github.com/SickGear/SickGear.git
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236 lines
7.7 KiB
Python
236 lines
7.7 KiB
Python
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"""
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Master Boot Record.
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"""
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# cfdisk uses the following algorithm to compute the geometry:
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# 0. Use the values given by the user.
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# 1. Try to guess the geometry from the partition table:
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# if all the used partitions end at the same head H and the
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# same sector S, then there are (H+1) heads and S sectors/cylinder.
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# 2. Ask the system (ioctl/HDIO_GETGEO).
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# 3. 255 heads and 63 sectors/cylinder.
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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Enum, Bits, UInt8, UInt16, UInt32,
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RawBytes)
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from hachoir.core.endian import LITTLE_ENDIAN
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from hachoir.core.tools import humanFilesize
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from hachoir.core.text_handler import textHandler, hexadecimal
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BLOCK_SIZE = 512 # bytes
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class CylinderNumber(Bits):
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def __init__(self, parent, name, description=None):
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Bits.__init__(self, parent, name, 10, description)
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def createValue(self):
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i = self.parent.stream.readInteger(
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self.absolute_address, False, self._size, self.parent.endian)
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return i >> 2 | i % 4 << 8
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class PartitionHeader(FieldSet):
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static_size = 16 * 8
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# taken from the source of cfdisk:
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# sed -n 's/.*{\(.*\), N_(\(.*\))}.*/ \1: \2,/p' i386_sys_types.c
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system_name = {
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0x00: "Empty",
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0x01: "FAT12",
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0x02: "XENIX root",
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0x03: "XENIX usr",
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0x04: "FAT16 <32M",
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0x05: "Extended",
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0x06: "FAT16",
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0x07: "HPFS/NTFS",
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0x08: "AIX",
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0x09: "AIX bootable",
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0x0a: "OS/2 Boot Manager",
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0x0b: "W95 FAT32",
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0x0c: "W95 FAT32 (LBA)",
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0x0e: "W95 FAT16 (LBA)",
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0x0f: "W95 Ext'd (LBA)",
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0x10: "OPUS",
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0x11: "Hidden FAT12",
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0x12: "Compaq diagnostics",
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0x14: "Hidden FAT16 <32M",
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0x16: "Hidden FAT16",
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0x17: "Hidden HPFS/NTFS",
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0x18: "AST SmartSleep",
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0x1b: "Hidden W95 FAT32",
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0x1c: "Hidden W95 FAT32 (LBA)",
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0x1e: "Hidden W95 FAT16 (LBA)",
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0x24: "NEC DOS",
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0x39: "Plan 9",
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0x3c: "PartitionMagic recovery",
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0x40: "Venix 80286",
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0x41: "PPC PReP Boot",
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0x42: "SFS",
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0x4d: "QNX4.x",
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0x4e: "QNX4.x 2nd part",
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0x4f: "QNX4.x 3rd part",
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0x50: "OnTrack DM",
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0x51: "OnTrack DM6 Aux1",
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0x52: "CP/M",
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0x53: "OnTrack DM6 Aux3",
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0x54: "OnTrackDM6",
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0x55: "EZ-Drive",
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0x56: "Golden Bow",
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0x5c: "Priam Edisk",
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0x61: "SpeedStor",
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0x63: "GNU HURD or SysV",
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0x64: "Novell Netware 286",
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0x65: "Novell Netware 386",
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0x70: "DiskSecure Multi-Boot",
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0x75: "PC/IX",
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0x80: "Old Minix",
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0x81: "Minix / old Linux",
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0x82: "Linux swap / Solaris",
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0x83: "Linux (ext2/ext3)",
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0x84: "OS/2 hidden C: drive",
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0x85: "Linux extended",
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0x86: "NTFS volume set",
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0x87: "NTFS volume set",
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0x88: "Linux plaintext",
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0x8e: "Linux LVM",
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0x93: "Amoeba",
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0x94: "Amoeba BBT",
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0x9f: "BSD/OS",
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0xa0: "IBM Thinkpad hibernation",
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0xa5: "FreeBSD",
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0xa6: "OpenBSD",
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0xa7: "NeXTSTEP",
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0xa8: "Darwin UFS",
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0xa9: "NetBSD",
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0xab: "Darwin boot",
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0xb7: "BSDI fs",
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0xb8: "BSDI swap",
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0xbb: "Boot Wizard hidden",
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0xbe: "Solaris boot",
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0xbf: "Solaris",
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0xc1: "DRDOS/sec (FAT-12)",
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0xc4: "DRDOS/sec (FAT-16 < 32M)",
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0xc6: "DRDOS/sec (FAT-16)",
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0xc7: "Syrinx",
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0xda: "Non-FS data",
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0xdb: "CP/M / CTOS / ...",
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0xde: "Dell Utility",
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0xdf: "BootIt",
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0xe1: "DOS access",
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0xe3: "DOS R/O",
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0xe4: "SpeedStor",
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0xeb: "BeOS fs",
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0xee: "EFI GPT",
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0xef: "EFI (FAT-12/16/32)",
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0xf0: "Linux/PA-RISC boot",
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0xf1: "SpeedStor",
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0xf4: "SpeedStor",
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0xf2: "DOS secondary",
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0xfd: "Linux raid autodetect",
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0xfe: "LANstep",
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0xff: "BBT"
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}
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def createFields(self):
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yield UInt8(self, "bootable", "Bootable flag (true if equals to 0x80)")
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if self["bootable"].value not in (0x00, 0x80):
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self.warning(
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"Stream doesn't look like master boot record (partition bootable error)!")
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yield UInt8(self, "start_head", "Starting head number of the partition")
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yield Bits(self, "start_sector", 6, "Starting sector number of the partition")
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yield CylinderNumber(self, "start_cylinder", "Starting cylinder number of the partition")
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yield Enum(UInt8(self, "system", "System indicator"), self.system_name)
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yield UInt8(self, "end_head", "Ending head number of the partition")
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yield Bits(self, "end_sector", 6, "Ending sector number of the partition")
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yield CylinderNumber(self, "end_cylinder", "Ending cylinder number of the partition")
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yield UInt32(self, "LBA", "LBA (number of sectors before this partition)")
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yield UInt32(self, "size", "Size (block count)")
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def isUsed(self):
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return self["system"].value != 0
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def createDescription(self):
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desc = "Partition header: "
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if self.isUsed():
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system = self["system"].display
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size = self["size"].value * BLOCK_SIZE
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desc += "%s, %s" % (system, humanFilesize(size))
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else:
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desc += "(unused)"
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return desc
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class MasterBootRecord(FieldSet):
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static_size = 512 * 8
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def createFields(self):
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yield RawBytes(self, "program", 446, "Boot program (Intel x86 machine code)")
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yield PartitionHeader(self, "header[0]")
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yield PartitionHeader(self, "header[1]")
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yield PartitionHeader(self, "header[2]")
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yield PartitionHeader(self, "header[3]")
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yield textHandler(UInt16(self, "signature", "Signature (0xAA55)"), hexadecimal)
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def _getPartitions(self):
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return (self[index] for index in range(1, 5))
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headers = property(_getPartitions)
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class Partition(FieldSet):
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def createFields(self):
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mbr = MasterBootRecord(self, "mbr")
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yield mbr
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# No error if we only want to analyse a backup of a mbr
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if self.eof:
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return
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for start, index, header in sorted((hdr["LBA"].value, index, hdr)
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for index, hdr in enumerate(mbr.headers) if hdr.isUsed()):
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# Seek to the beginning of the partition
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padding = self.seekByte(start * BLOCK_SIZE, "padding[]")
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if padding:
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yield padding
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# Content of the partition
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name = "partition[%u]" % index
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size = BLOCK_SIZE * header["size"].value
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desc = header["system"].display
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if header["system"].value == 5:
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yield Partition(self, name, desc, size * 8)
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else:
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yield RawBytes(self, name, size, desc)
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# Padding at the end
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if self.current_size < self._size:
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yield self.seekBit(self._size, "end")
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class MSDos_HardDrive(Parser, Partition):
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endian = LITTLE_ENDIAN
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MAGIC = b"\x55\xAA"
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PARSER_TAGS = {
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"id": "msdos_harddrive",
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"category": "file_system",
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"description": "MS-DOS hard drive with Master Boot Record (MBR)",
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"min_size": 512 * 8,
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"file_ext": ("",),
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# "magic": ((MAGIC, 510*8),),
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}
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def validate(self):
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if self.stream.readBytes(510 * 8, 2) != self.MAGIC:
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return "Invalid signature"
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used = False
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for hdr in self["mbr"].headers:
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if hdr["bootable"].value not in (0x00, 0x80):
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return "Wrong boot flag"
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used |= hdr.isUsed()
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return used or "No partition found"
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