mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-22 10:43:38 +00:00
128 lines
4.5 KiB
Python
128 lines
4.5 KiB
Python
"""
|
|
Tar archive parser.
|
|
|
|
Author: Victor Stinner
|
|
"""
|
|
|
|
from hachoir.parser import Parser
|
|
from hachoir.field import (FieldSet,
|
|
Enum, UInt8, SubFile, String, NullBytes)
|
|
from hachoir.core.tools import humanFilesize, paddingSize, timestampUNIX
|
|
from hachoir.core.endian import BIG_ENDIAN
|
|
import re
|
|
|
|
|
|
class FileEntry(FieldSet):
|
|
type_name = {
|
|
# 48 is "0", 49 is "1", ...
|
|
0: "Normal disk file (old format)",
|
|
48: "Normal disk file",
|
|
49: "Link to previously dumped file",
|
|
50: "Symbolic link",
|
|
51: "Character special file",
|
|
52: "Block special file",
|
|
53: "Directory",
|
|
54: "FIFO special file",
|
|
55: "Contiguous file"
|
|
}
|
|
|
|
def getOctal(self, name):
|
|
return self.octal2int(self[name].value)
|
|
|
|
def getDatetime(self):
|
|
"""
|
|
Create modification date as Unicode string, may raise ValueError.
|
|
"""
|
|
timestamp = self.getOctal("mtime")
|
|
return timestampUNIX(timestamp)
|
|
|
|
def createFields(self):
|
|
yield String(self, "name", 100, "Name", strip="\0", charset="ISO-8859-1")
|
|
yield String(self, "mode", 8, "Mode", strip=" \0", charset="ASCII")
|
|
yield String(self, "uid", 8, "User ID", strip=" \0", charset="ASCII")
|
|
yield String(self, "gid", 8, "Group ID", strip=" \0", charset="ASCII")
|
|
yield String(self, "size", 12, "Size", strip=" \0", charset="ASCII")
|
|
yield String(self, "mtime", 12, "Modification time", strip=" \0", charset="ASCII")
|
|
yield String(self, "check_sum", 8, "Check sum", strip=" \0", charset="ASCII")
|
|
yield Enum(UInt8(self, "type", "Type"), self.type_name)
|
|
yield String(self, "lname", 100, "Link name", strip=" \0", charset="ISO-8859-1")
|
|
yield String(self, "magic", 8, "Magic", strip=" \0", charset="ASCII")
|
|
yield String(self, "uname", 32, "User name", strip=" \0", charset="ISO-8859-1")
|
|
yield String(self, "gname", 32, "Group name", strip=" \0", charset="ISO-8859-1")
|
|
yield String(self, "devmajor", 8, "Dev major", strip=" \0", charset="ASCII")
|
|
yield String(self, "devminor", 8, "Dev minor", strip=" \0", charset="ASCII")
|
|
yield String(self, "prefix", 155, "Prefix for filename", strip="\0", charset="ASCII")
|
|
yield NullBytes(self, "padding", 12, "Padding (zero)")
|
|
|
|
filesize = self.getOctal("size")
|
|
if filesize:
|
|
yield SubFile(self, "content", filesize, filename=self["name"].value)
|
|
|
|
size = paddingSize(self.current_size // 8, 512)
|
|
if size:
|
|
yield NullBytes(self, "padding_end", size, "Padding (512 align)")
|
|
|
|
def convertOctal(self, chunk):
|
|
return self.octal2int(chunk.value)
|
|
|
|
def isEmpty(self):
|
|
return self["name"].value == ""
|
|
|
|
def octal2int(self, text):
|
|
try:
|
|
return int(text, 8)
|
|
except ValueError:
|
|
return 0
|
|
|
|
def createDescription(self):
|
|
if self.isEmpty():
|
|
desc = "(terminator, empty header)"
|
|
else:
|
|
filename = self["name"].value
|
|
if self["prefix"].value:
|
|
filename = self["prefix"].value + '/' + filename
|
|
filesize = humanFilesize(self.getOctal("size"))
|
|
desc = "(%s: %s, %s)" % \
|
|
(filename, self["type"].display, filesize)
|
|
return "Tar File " + desc
|
|
|
|
|
|
class TarFile(Parser):
|
|
endian = BIG_ENDIAN
|
|
PARSER_TAGS = {
|
|
"id": "tar",
|
|
"category": "archive",
|
|
"file_ext": ("tar",),
|
|
"mime": ("application/x-tar", "application/x-gtar"),
|
|
"min_size": 512 * 8,
|
|
"magic": ((b"ustar \0", 257 * 8),),
|
|
"subfile": "skip",
|
|
"description": "TAR archive",
|
|
}
|
|
_sign = re.compile(b"ustar *\0|[ \0]*$")
|
|
|
|
def validate(self):
|
|
if not self._sign.match(self.stream.readBytes(257 * 8, 8)):
|
|
return "Invalid magic number"
|
|
if self[0].name == "terminator":
|
|
return "Don't contain any file"
|
|
try:
|
|
int(self["file[0]/uid"].value, 8)
|
|
int(self["file[0]/gid"].value, 8)
|
|
int(self["file[0]/size"].value, 8)
|
|
except ValueError:
|
|
return "Invalid file size"
|
|
return True
|
|
|
|
def createFields(self):
|
|
while not self.eof:
|
|
field = FileEntry(self, "file[]")
|
|
if field.isEmpty():
|
|
yield NullBytes(self, "terminator", 512)
|
|
break
|
|
yield field
|
|
if self.current_size < self._size:
|
|
yield self.seekBit(self._size, "end")
|
|
|
|
def createContentSize(self):
|
|
return self["terminator"].address + self["terminator"].size
|