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mirror of https://github.com/moparisthebest/SickRage synced 2024-11-18 07:15:13 -05:00
SickRage/lib/hachoir_parser/file_system/fat.py
echel0n 0d9fbc1ad7 Welcome to our SickBeard-TVRage Edition ...
This version of SickBeard uses both TVDB and TVRage to search and gather it's series data from allowing you to now have access to and download shows that you couldn't before because of being locked into only what TheTVDB had to offer.

Also this edition is based off the code we used in our XEM editon so it does come with scene numbering support as well as all the other features our XEM edition has to offer.

Please before using this with your existing database (sickbeard.db) please make a backup copy of it and delete any other database files such as cache.db and failed.db if present, we HIGHLY recommend starting out with no database files at all to make this a fresh start but the choice is at your own risk!

Enjoy!
2014-03-09 22:39:12 -07:00

434 lines
16 KiB
Python

from lib.hachoir_core.compatibility import sorted
from lib.hachoir_parser import Parser
from lib.hachoir_core.field import (FieldSet, StaticFieldSet,
RawBytes, PaddingBytes, createPaddingField, Link, Fragment,
Bit, Bits, UInt8, UInt16, UInt32,
String, Bytes, NullBytes)
from lib.hachoir_core.field.integer import GenericInteger
from lib.hachoir_core.endian import LITTLE_ENDIAN
from lib.hachoir_core.text_handler import textHandler, hexadecimal
from lib.hachoir_core.error import error
from lib.hachoir_core.tools import humanFilesize, makePrintable
import datetime
import re
strip_index = re.compile(r'\[[^]]+]$')
class Boot(FieldSet):
static_size = 512*8
def createFields(self):
yield Bytes(self, "jmp", 3, "Jump instruction (to skip over header on boot)")
yield Bytes(self, "oem_name", 8, "OEM Name (padded with spaces)")
yield UInt16(self, "sector_size", "Bytes per sector")
yield UInt8 (self, "cluster_size", "Sectors per cluster")
yield UInt16(self, "reserved_sectors", "Reserved sector count (including boot sector)")
yield UInt8 (self, "fat_nb", "Number of file allocation tables")
yield UInt16(self, "max_root", "Maximum number of root directory entries")
yield UInt16(self, "sectors1", "Total sectors (if zero, use 'sectors2')")
yield UInt8 (self, "media_desc", "Media descriptor")
yield UInt16(self, "fat_size", "Sectors per FAT")
yield UInt16(self, "track_size", "Sectors per track")
yield UInt16(self, "head_nb", "Number of heads")
yield UInt32(self, "hidden", "Hidden sectors")
yield UInt32(self, "sectors2", "Total sectors (if greater than 65535)")
if self.parent.version == 32:
yield UInt32(self, "fat32_size", "Sectors per FAT")
yield UInt16(self, "fat_flags", "FAT Flags")
yield UInt16(self, "version", "Version")
yield UInt32(self, "root_start", "Cluster number of root directory start")
yield UInt16(self, "inf_sector", "Sector number of FS Information Sector")
yield UInt16(self, "boot_copy", "Sector number of a copy of this boot sector")
yield NullBytes(self, "reserved[]", 12, "Reserved")
yield UInt8(self, "phys_drv", "Physical drive number")
yield NullBytes(self, "reserved[]", 1, 'Reserved ("current head")')
yield UInt8(self, "sign", "Signature")
yield textHandler(UInt32(self, "serial", "ID (serial number)"), hexadecimal)
yield String(self, "label", 11, "Volume Label", strip=' ', charset="ASCII")
yield String(self, "fs_type", 8, "FAT file system type", strip=' ', charset="ASCII")
yield Bytes(self, "code", 510-self.current_size/8, "Operating system boot code")
yield Bytes(self, "trail_sig", 2, "Signature (0x55 0xAA)")
class FSInfo(StaticFieldSet):
format = (
(String, "lead_sig", 4, 'Signature ("RRaA")'),
(NullBytes, "reserved[]", 480),
(String, "struct_sig", 4, 'Signature ("rrAa")'),
(UInt32, "free_count", "Last known free cluster count on the volume"),
(UInt32, "nxt_free",),
(NullBytes, "reserved[]", 12),
(Bytes, "trail_sig", 4, "Signature (0x00 0x00 0x55 0xAA)")
)
class FAT(FieldSet):
class FAT(FieldSet):
def createFields(self):
parent = self.parent
version = parent.parent.version
text_handler = parent.text_handler
while self.current_size < self._size:
yield textHandler(GenericInteger(self, 'entry[]', False, version), text_handler)
def createFields(self):
version = self.parent.version
max_entry = 1 << min(28, version)
def FatEntry(chunk):
i = chunk.value
j = (1 - i) % max_entry
if j == 0:
return "reserved cluster"
elif j == 1:
return "free cluster"
elif j < 10:
return "end of a chain"
elif j == 10:
return "bad cluster"
elif j < 18:
return "reserved value"
else:
return str(i)
self.text_handler = FatEntry
while self.current_size < self._size:
yield FAT.FAT(self, 'group[]', size=min(1000*version,self._size-self.current_size))
class Date(FieldSet):
def __init__(self, parent, name):
FieldSet.__init__(self, parent, name, size={
"create": 5,
"access": 2,
"modify": 4,
}[name] * 8)
def createFields(self):
size = self.size / 8
if size > 2:
if size > 4:
yield UInt8(self, "cs", "10ms units, values from 0 to 199")
yield Bits(self, "2sec", 5, "seconds/2")
yield Bits(self, "min", 6, "minutes")
yield Bits(self, "hour", 5, "hours")
yield Bits(self, "day", 5, "(1-31)")
yield Bits(self, "month", 4, "(1-12)")
yield Bits(self, "year", 7, "(0 = 1980, 127 = 2107)")
def createDescription(self):
date = [ self["year"].value, self["month"].value, self["day"].value ]
size = self.size / 8
if size > 2:
mkdate = datetime.datetime
cs = 200 * self["2sec"].value
if size > 4:
cs += self["cs"].value
date += [ self["hour"].value, self["min"].value, cs / 100, cs % 100 * 10000 ]
else:
mkdate = datetime.date
if date == [ 0 for i in date ]:
date = None
else:
date[0] += 1980
try:
date = mkdate(*tuple(date))
except ValueError:
return "invalid"
return str(date)
class InodeLink(Link):
def __init__(self, parent, name, target=None):
Link.__init__(self, parent, name)
self.target = target
self.first = None
def _getTargetPath(self):
if not self.target:
parent = self.parent
self.target = strip_index.sub(r"\\", parent.parent._name) + parent.getFilename().rstrip("/")
return self.target
def createValue(self):
field = InodeGen(self["/"], self.parent, self._getTargetPath())(self)
if field:
self._display = field.path
return Link.createValue(self)
def createDisplay(self):
return "/%s[0]" % self._getTargetPath()
class FileEntry(FieldSet):
static_size = 32*8
process = False
LFN = False
def __init__(self, *args):
FieldSet.__init__(self, *args)
self.status = self.stream.readBits(self.absolute_address, 8, LITTLE_ENDIAN)
if self.status in (0, 0xE5):
return
magic = self.stream.readBits(self.absolute_address+11*8, 8, LITTLE_ENDIAN)
if magic & 0x3F == 0x0F:
self.LFN = True
elif self.getFilename() not in (".", ".."):
self.process = True
def getFilename(self):
name = self["name"].value
if isinstance(name, str):
name = makePrintable(name, "ASCII", to_unicode=True)
ext = self["ext"].value
if ext:
name += "." + ext
if name[0] == 5:
name = "\xE5" + name[1:]
if not self.LFN and self["directory"].value:
name += "/"
return name
def createDescription(self):
if self.status == 0:
return "Free entry"
elif self.status == 0xE5:
return "Deleted file"
elif self.LFN:
name = "".join( field.value for field in self.array("name") )
try:
name = name[:name.index('\0')]
except ValueError:
pass
seq_no = self["seq_no"].value
return "Long filename part: '%s' [%u]" % (name, seq_no)
else:
return "File: '%s'" % self.getFilename()
def getCluster(self):
cluster = self["cluster_lo"].value
if self.parent.parent.version > 16:
cluster += self["cluster_hi"].value << 16
return cluster
def createFields(self):
if not self.LFN:
yield String(self, "name", 8, "DOS file name (padded with spaces)",
strip=' ', charset="ASCII")
yield String(self, "ext", 3, "DOS file extension (padded with spaces)",
strip=' ', charset="ASCII")
yield Bit(self, "read_only")
yield Bit(self, "hidden")
yield Bit(self, "system")
yield Bit(self, "volume_label")
yield Bit(self, "directory")
yield Bit(self, "archive")
yield Bit(self, "device")
yield Bit(self, "unused")
yield RawBytes(self, "reserved", 1, "Something about the case")
yield Date(self, "create")
yield Date(self, "access")
if self.parent.parent.version > 16:
yield UInt16(self, "cluster_hi")
else:
yield UInt16(self, "ea_index")
yield Date(self, "modify")
yield UInt16(self, "cluster_lo")
size = UInt32(self, "size")
yield size
if self.process:
del self.process
target_size = size.value
if self["directory"].value:
if target_size:
size.error("(FAT) value must be zero")
target_size = 0
elif not target_size:
return
self.target_size = 8 * target_size
yield InodeLink(self, "data")
else:
yield UInt8(self, "seq_no", "Sequence Number")
yield String(self, "name[]", 10, "(5 UTF-16 characters)",
charset="UTF-16-LE")
yield UInt8(self, "magic", "Magic number (15)")
yield NullBytes(self, "reserved", 1, "(always 0)")
yield UInt8(self, "checksum", "Checksum of DOS file name")
yield String(self, "name[]", 12, "(6 UTF-16 characters)",
charset="UTF-16-LE")
yield UInt16(self, "first_cluster", "(always 0)")
yield String(self, "name[]", 4, "(2 UTF-16 characters)",
charset="UTF-16-LE")
class Directory(Fragment):
def createFields(self):
while self.current_size < self._size:
yield FileEntry(self, "entry[]")
class File(Fragment):
def _getData(self):
return self["data"]
def createFields(self):
yield Bytes(self, "data", self.datasize/8)
padding = self._size - self.current_size
if padding:
yield createPaddingField(self, padding)
class InodeGen:
def __init__(self, root, entry, path):
self.root = root
self.cluster = root.clusters(entry.getCluster)
self.path = path
self.filesize = entry.target_size
self.done = 0
def createInputStream(cis, **args):
args["size"] = self.filesize
args.setdefault("tags",[]).append(("filename", entry.getFilename()))
return cis(**args)
self.createInputStream = createInputStream
def __call__(self, prev):
name = self.path + "[]"
address, size, last = self.cluster.next()
if self.filesize:
if self.done >= self.filesize:
error("(FAT) bad metadata for " + self.path)
return
field = File(self.root, name, size=size)
if prev.first is None:
field._description = 'File size: %s' % humanFilesize(self.filesize//8)
field.setSubIStream(self.createInputStream)
field.datasize = min(self.filesize - self.done, size)
self.done += field.datasize
else:
field = Directory(self.root, name, size=size)
padding = self.root.getFieldByAddress(address, feed=False)
if not isinstance(padding, (PaddingBytes, RawBytes)):
error("(FAT) address %u doesn't point to a padding field" % address)
return
if last:
next = None
else:
next = lambda: self(field)
field.setLinks(prev.first, next)
self.root.writeFieldsIn(padding, address, (field,))
return field
class FAT_FS(Parser):
endian = LITTLE_ENDIAN
PARSER_TAGS = {
"category": "file_system",
"min_size": 512*8,
"file_ext": ("",),
}
def _validate(self, type_offset):
if self.stream.readBytes(type_offset*8, 8) != ("FAT%-5u" % self.version):
return "Invalid FAT%u signature" % self.version
if self.stream.readBytes(510*8, 2) != "\x55\xAA":
return "Invalid BIOS signature"
return True
def clusters(self, cluster_func):
max_entry = (1 << min(28, self.version)) - 16
cluster = cluster_func()
if 1 < cluster < max_entry:
clus_nb = 1
next = cluster
while True:
next = self.fat[next/1000][next%1000].value
if not 1 < next < max_entry:
break
if cluster + clus_nb == next:
clus_nb += 1
else:
yield self.data_start + cluster * self.cluster_size, clus_nb * self.cluster_size, False
cluster = next
clus_nb = 1
yield self.data_start + cluster * self.cluster_size, clus_nb * self.cluster_size, True
def createFields(self):
# Read boot seector
boot = Boot(self, "boot", "Boot sector")
yield boot
self.sector_size = boot["sector_size"].value
if self.version == 32:
for field in sorted((
(boot["inf_sector"].value, lambda: FSInfo(self, "fsinfo")),
(boot["boot_copy"].value, lambda: Boot(self, "bkboot", "Copy of the boot sector")),
)):
if field[0]:
padding = self.seekByte(field[0] * self.sector_size)
if padding:
yield padding
yield field[1]()
padding = self.seekByte(boot["reserved_sectors"].value * self.sector_size)
if padding:
yield padding
# Read the two FAT
fat_size = boot["fat_size"].value
if fat_size == 0:
fat_size = boot["fat32_size"].value
fat_size *= self.sector_size * 8
for i in xrange(boot["fat_nb"].value):
yield FAT(self, "fat[]", "File Allocation Table", size=fat_size)
# Read inode table (Directory)
self.cluster_size = boot["cluster_size"].value * self.sector_size * 8
self.fat = self["fat[0]"]
if "root_start" in boot:
self.target_size = 0
self.getCluster = lambda: boot["root_start"].value
yield InodeLink(self, "root", "root")
else:
yield Directory(self, "root[]", size=boot["max_root"].value * 32 * 8)
self.data_start = self.current_size - 2 * self.cluster_size
sectors = boot["sectors1"].value
if not sectors:
sectors = boot["sectors2"].value
# Create one big padding field for the end
size = sectors * self.sector_size
if self._size:
size = min(size, self.size//8)
padding = self.seekByte(size)
if padding:
yield padding
class FAT12(FAT_FS):
PARSER_TAGS = {
"id": "fat12",
"description": "FAT12 filesystem",
"magic": (("FAT12 ", 54*8),),
}
version = 12
def validate(self):
return FAT_FS._validate(self, 54)
class FAT16(FAT_FS):
PARSER_TAGS = {
"id": "fat16",
"description": "FAT16 filesystem",
"magic": (("FAT16 ", 54*8),),
}
version = 16
def validate(self):
return FAT_FS._validate(self, 54)
class FAT32(FAT_FS):
PARSER_TAGS = {
"id": "fat32",
"description": "FAT32 filesystem",
"magic": (("FAT32 ", 82*8),),
}
version = 32
def validate(self):
return FAT_FS._validate(self, 82)