mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-24 03:33:38 +00:00
619 lines
20 KiB
Python
619 lines
20 KiB
Python
from hachoir.core.endian import BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN
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from hachoir.core.error import info
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from hachoir.core.log import Logger
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from hachoir.core.bits import str2long
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from hachoir.core.tools import lowerBound
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from hachoir.core.tools import alignValue
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from errno import ESPIPE
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from weakref import ref as weakref_ref
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from hachoir.stream import StreamError
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class InputStreamError(StreamError):
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pass
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class ReadStreamError(InputStreamError):
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def __init__(self, size, address, got=None):
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self.size = size
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self.address = address
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self.got = got
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if self.got is not None:
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msg = "Can't read %u bits at address %u (got %u bits)" % (
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self.size, self.address, self.got)
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else:
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msg = "Can't read %u bits at address %u" % (
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self.size, self.address)
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InputStreamError.__init__(self, msg)
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class NullStreamError(InputStreamError):
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def __init__(self, source):
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self.source = source
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msg = "Input size is nul (source='%s')!" % self.source
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InputStreamError.__init__(self, msg)
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class FileFromInputStream:
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_offset = 0
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_from_end = False
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def __init__(self, stream):
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self.stream = stream
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self._setSize(stream.askSize(self))
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def _setSize(self, size):
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if size is None:
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self._size = size
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elif size % 8:
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raise InputStreamError("Invalid size")
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else:
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self._size = size // 8
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def tell(self):
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if self._from_end:
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while self._size is None:
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self.stream._feed(max(self.stream._current_size << 1, 1 << 16))
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self._from_end = False
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self._offset += self._size
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return self._offset
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def seek(self, pos, whence=0):
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if whence == 0:
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self._from_end = False
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self._offset = pos
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elif whence == 1:
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self._offset += pos
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elif whence == 2:
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self._from_end = True
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self._offset = pos
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else:
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raise ValueError("seek() second argument must be 0, 1 or 2")
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def read(self, size=None):
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def read(address, size):
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shift, data, missing = self.stream.read(8 * address, 8 * size)
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if shift:
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raise InputStreamError("TODO: handle non-byte-aligned data")
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return data
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if self._size or size is not None and not self._from_end:
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# We don't want self.tell() to read anything
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# and the size must be known if we read until the end.
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pos = self.tell()
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if size is None or (self._size is not None and self._size < pos + size):
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size = self._size - pos
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if size <= 0:
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return b''
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data = read(pos, size)
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self._offset += len(data)
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return data
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elif self._from_end:
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# TODO: not tested
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max_size = - self._offset
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if size is None or max_size < size:
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size = max_size
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if size <= 0:
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return b''
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data = b'', b''
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self._offset = max(
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0, self.stream._current_size // 8 + self._offset)
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self._from_end = False
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bs = max(max_size, 1 << 16)
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while True:
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d = read(self._offset, bs)
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data = data[1], d
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self._offset += len(d)
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if self._size:
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bs = self._size - self._offset
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if not bs:
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data = data[0] + data[1]
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d = len(data) - max_size
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return data[d:d + size]
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else:
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# TODO: not tested
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data = []
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size = 1 << 16
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while True:
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d = read(self._offset, size)
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data.append(d)
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self._offset += len(d)
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if self._size:
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size = self._size - self._offset
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if not size:
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return b''.join(data)
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class InputStream(Logger):
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_set_size = None
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_current_size = 0
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def __init__(self, source=None, size=None, packets=None, **args):
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self.source = source
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self._size = size # in bits
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if size == 0:
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raise NullStreamError(source)
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self.tags = tuple(args.get("tags", tuple()))
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self.packets = packets
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def close(self):
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raise NotImplementedError
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def askSize(self, client):
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if self._size != self._current_size:
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if self._set_size is None:
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self._set_size = []
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self._set_size.append(weakref_ref(client))
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return self._size
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def _setSize(self, size=None):
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assert self._size is None or self._current_size <= self._size
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if self._size != self._current_size:
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self._size = self._current_size
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if not self._size:
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raise NullStreamError(self.source)
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if self._set_size:
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for client in self._set_size:
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client = client()
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if client:
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client._setSize(self._size)
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del self._set_size
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size = property(lambda self: self._size, doc="Size of the stream in bits")
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checked = property(lambda self: self._size == self._current_size)
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def sizeGe(self, size, const=False):
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if self._current_size >= size:
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return True
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elif self._size is not None and 0 < self._size < size:
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return False
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else:
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return not const and not self._feed(size)
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def _feed(self, size):
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return self.read(size - 1, 1)[2]
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def read(self, address, size):
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"""
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Read 'size' bits at position 'address' (in bits)
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from the beginning of the stream.
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"""
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raise NotImplementedError
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def readBits(self, address, nbits, endian):
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assert endian in (BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN)
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if endian is MIDDLE_ENDIAN:
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# read an aligned chunk of words
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wordaddr, remainder = divmod(address, 16)
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wordnbits = alignValue(remainder + nbits, 16)
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_, data, missing = self.read(wordaddr * 16, wordnbits)
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shift = remainder
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else:
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shift, data, missing = self.read(address, nbits)
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if missing:
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raise ReadStreamError(nbits, address)
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value = str2long(data, endian)
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if endian in (BIG_ENDIAN, MIDDLE_ENDIAN):
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value >>= len(data) * 8 - shift - nbits
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else:
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value >>= shift
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return value & (1 << nbits) - 1
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def readInteger(self, address, signed, nbits, endian):
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""" Read an integer number """
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value = self.readBits(address, nbits, endian)
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# Signe number. Example with nbits=8:
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# if 128 <= value: value -= 256
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if signed and (1 << (nbits - 1)) <= value:
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value -= (1 << nbits)
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return value
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def readBytes(self, address, nb_bytes):
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shift, data, missing = self.read(address, 8 * nb_bytes)
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if shift:
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raise InputStreamError("TODO: handle non-byte-aligned data")
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if missing:
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raise ReadStreamError(8 * nb_bytes, address)
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return data
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def searchBytesLength(self, needle, include_needle,
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start_address=0, end_address=None):
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"""
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If include_needle is True, add its length to the result.
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Returns None is needle can't be found.
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"""
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pos = self.searchBytes(needle, start_address, end_address)
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if pos is None:
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return None
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length = (pos - start_address) // 8
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if include_needle:
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length += len(needle)
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return length
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def searchBytes(self, needle, start_address=0, end_address=None):
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"""
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Search some bytes in [start_address;end_address[. Addresses must
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be aligned to byte. Returns the address of the bytes if found,
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None else.
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"""
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if start_address % 8:
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raise InputStreamError(
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"Unable to search bytes with address with bit granularity")
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length = len(needle)
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size = max(3 * length, 4096)
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buffer = b''
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if self._size and (end_address is None or self._size < end_address):
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end_address = self._size
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while True:
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if end_address is not None:
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todo = (end_address - start_address) >> 3
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if todo < size:
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if todo <= 0:
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return None
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size = todo
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data = self.readBytes(start_address, size)
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if end_address is None and self._size:
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end_address = self._size
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size = (end_address - start_address) >> 3
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assert size > 0
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data = data[:size]
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start_address += 8 * size
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buffer = buffer[len(buffer) - length + 1:] + data
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found = buffer.find(needle)
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if found >= 0:
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return start_address + (found - len(buffer)) * 8
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def file(self):
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return FileFromInputStream(self)
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class InputPipe(object):
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"""
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InputPipe makes input streams seekable by caching a certain
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amount of data. The memory usage may be unlimited in worst cases.
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A function (set_size) is called when the size of the stream is known.
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InputPipe sees the input stream as an array of blocks of
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size = (2 ^ self.buffer_size) and self.buffers maps to this array.
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It also maintains a circular ordered list of non-discarded blocks,
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sorted by access time.
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Each element of self.buffers is an array of 3 elements:
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* self.buffers[i][0] is the data.
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len(self.buffers[i][0]) == 1 << self.buffer_size
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(except at the end: the length may be smaller)
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* self.buffers[i][1] is the index of a more recently used block
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* self.buffers[i][2] is the opposite of self.buffers[1],
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in order to have a double-linked list.
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For any discarded block, self.buffers[i] = None
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self.last is the index of the most recently accessed block.
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self.first is the first (= smallest index) non-discarded block.
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How InputPipe discards blocks:
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* Just before returning from the read method.
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* Only if there are more than self.buffer_nb_min blocks in memory.
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* While self.buffers[self.first] is that least recently used block.
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Property: There is no hole in self.buffers, except at the beginning.
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"""
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buffer_nb_min = 256
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buffer_size = 16
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last = None
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size = None
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def __init__(self, input, set_size=None):
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self._input = input
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self.first = self.address = 0
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self.buffers = []
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self.set_size = set_size
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current_size = property(lambda self: len(self.buffers) << self.buffer_size)
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def _append(self, data):
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if self.last is None:
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self.last = next = prev = 0
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else:
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prev = self.last
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last = self.buffers[prev]
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next = last[1]
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self.last = self.buffers[next][2] = last[1] = len(self.buffers)
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self.buffers.append([data, next, prev])
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def _get(self, index):
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if index >= len(self.buffers):
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return b''
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buf = self.buffers[index]
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if buf is None:
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raise InputStreamError(
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"Error: Buffers too small. Can't seek backward.")
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if self.last != index:
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next = buf[1]
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prev = buf[2]
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self.buffers[next][2] = prev
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self.buffers[prev][1] = next
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first = self.buffers[self.last][1]
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buf[1] = first
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buf[2] = self.last
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self.buffers[first][2] = index
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self.buffers[self.last][1] = index
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self.last = index
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return buf[0]
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def _flush(self):
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lim = len(self.buffers) - self.buffer_nb_min
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while self.first < lim:
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buf = self.buffers[self.first]
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if buf[2] != self.last:
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break
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info("Discarding buffer %u." % self.first)
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self.buffers[self.last][1] = buf[1]
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self.buffers[buf[1]][2] = self.last
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self.buffers[self.first] = None
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self.first += 1
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def seek(self, address):
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assert 0 <= address
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self.address = address
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def read(self, size):
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end = self.address + size
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for i in range(len(self.buffers), (end >> self.buffer_size) + 1):
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data = self._input.read(1 << self.buffer_size)
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if len(data) < 1 << self.buffer_size:
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self.size = (len(self.buffers) << self.buffer_size) + len(data)
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if self.set_size:
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self.set_size(self.size)
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if data:
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self._append(data)
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break
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self._append(data)
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block, offset = divmod(self.address, 1 << self.buffer_size)
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data = b''.join(self._get(index)
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for index in range(block, (end - 1 >> self.buffer_size) + 1)
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)[offset:offset + size]
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self._flush()
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self.address += len(data)
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return data
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class InputIOStream(InputStream):
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def __init__(self, input, size=None, **args):
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if not hasattr(input, "seek"):
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if size is None:
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input = InputPipe(input, self._setSize)
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else:
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input = InputPipe(input)
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elif size is None:
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try:
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input.seek(0, 2)
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size = input.tell() * 8
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except IOError as err:
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if err.errno == ESPIPE:
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input = InputPipe(input, self._setSize)
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else:
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source = args.get("source", "<inputio:%r>" % input)
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raise InputStreamError(
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"Unable to get size of %s: %s" % (source, err))
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self._input = input
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InputStream.__init__(self, size=size, **args)
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def close(self):
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self._input.close()
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def __current_size(self):
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if self._size:
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return self._size
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if self._input.size:
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return 8 * self._input.size
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return 8 * self._input.current_size
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_current_size = property(__current_size)
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def read(self, address, size):
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if not size:
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return (0, b'', False)
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assert size > 0
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_size = self._size
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address, shift = divmod(address, 8)
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self._input.seek(address)
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size = (size + shift + 7) >> 3
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data = self._input.read(size)
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got = len(data)
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missing = size != got
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if missing and _size == self._size:
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raise ReadStreamError(8 * size, 8 * address, 8 * got)
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return shift, data, missing
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def file(self):
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if hasattr(self._input, "fileno"):
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from os import dup, fdopen
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new_fd = dup(self._input.fileno())
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new_file = fdopen(new_fd, "rb")
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new_file.seek(0)
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return new_file
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return InputStream.file(self)
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class StringInputStream(InputStream):
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def __init__(self, data, source="<string>", **args):
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self.data = data
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InputStream.__init__(self, source=source, size=8 * len(data), **args)
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self._current_size = self._size
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def close(self):
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pass
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def read(self, address, size):
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address, shift = divmod(address, 8)
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size = (size + shift + 7) >> 3
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data = self.data[address:address + size]
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got = len(data)
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if got != size:
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raise ReadStreamError(8 * size, 8 * address, 8 * got)
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return shift, data, False
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class InputSubStream(InputStream):
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def __init__(self, stream, offset, size=None, source=None, **args):
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if offset is None:
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offset = 0
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if size is None and stream.size is not None:
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size = stream.size - offset
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if size <= 0:
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raise ValueError("InputSubStream: offset is outside input stream")
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self.stream = stream
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self._offset = offset
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if source is None:
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source = "<substream input=%s offset=%s size=%s>" % (
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stream.source, offset, size)
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InputStream.__init__(self, source=source, size=size, **args)
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self.stream.askSize(self)
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_current_size = property(lambda self: min(
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self._size, max(0, self.stream._current_size - self._offset)))
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def close(self):
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self.stream = None
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def read(self, address, size):
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return self.stream.read(self._offset + address, size)
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def InputFieldStream(field, **args):
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if not field.parent:
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return field.stream
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stream = field.parent.stream
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args["size"] = field.size
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args.setdefault("source", stream.source + field.path)
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return InputSubStream(stream, field.absolute_address, **args)
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class FragmentedStream(InputStream):
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def __init__(self, field, **args):
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self.stream = field.parent.stream
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data = field.getData()
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self.fragments = [(0, data.absolute_address, data.size)]
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self.next = field.next
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args.setdefault("source", "%s%s" % (self.stream.source, field.path))
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InputStream.__init__(self, **args)
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if not self.next:
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self._current_size = data.size
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self._setSize()
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def close(self):
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self.stream = None
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def _feed(self, end):
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if self._current_size < end:
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if self.checked:
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raise ReadStreamError(end - self._size, self._size)
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a, fa, fs = self.fragments[-1]
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while self.stream.sizeGe(fa + min(fs, end - a)):
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a += fs
|
|
f = self.next
|
|
if a >= end:
|
|
self._current_size = end
|
|
if a == end and not f:
|
|
self._setSize()
|
|
return False
|
|
if f:
|
|
self.next = f.next
|
|
f = f.getData()
|
|
if not f:
|
|
self._current_size = a
|
|
self._setSize()
|
|
return True
|
|
fa = f.absolute_address
|
|
fs = f.size
|
|
self.fragments += [(a, fa, fs)]
|
|
self._current_size = a + max(0, self.stream.size - fa)
|
|
self._setSize()
|
|
return True
|
|
return False
|
|
|
|
def read(self, address, size):
|
|
assert size > 0
|
|
missing = self._feed(address + size)
|
|
if missing:
|
|
size = self._size - address
|
|
if size <= 0:
|
|
return 0, b'', True
|
|
d = []
|
|
i = lowerBound(self.fragments, lambda x: x[0] <= address)
|
|
a, fa, fs = self.fragments[i - 1]
|
|
a -= address
|
|
fa -= a
|
|
fs += a
|
|
s = None
|
|
while True:
|
|
n = min(fs, size)
|
|
u, v, w = self.stream.read(fa, n)
|
|
assert not w
|
|
if s is None:
|
|
s = u
|
|
else:
|
|
assert not u
|
|
d += [v]
|
|
size -= n
|
|
if not size:
|
|
return s, b''.join(d), missing
|
|
a, fa, fs = self.fragments[i]
|
|
i += 1
|
|
|
|
|
|
class ConcatStream(InputStream):
|
|
# TODO: concatene any number of any type of stream
|
|
|
|
def __init__(self, streams, **args):
|
|
if len(streams) > 2 or not streams[0].checked:
|
|
raise NotImplementedError
|
|
self.__size0 = streams[0].size
|
|
size1 = streams[1].askSize(self)
|
|
if size1 is not None:
|
|
args["size"] = self.__size0 + size1
|
|
self.__streams = streams
|
|
InputStream.__init__(self, **args)
|
|
|
|
_current_size = property(
|
|
lambda self: self.__size0 + self.__streams[1]._current_size)
|
|
|
|
def close(self):
|
|
self.__streams = None
|
|
|
|
def read(self, address, size):
|
|
_size = self._size
|
|
s = self.__size0 - address
|
|
shift, data, missing = None, b'', False
|
|
if s > 0:
|
|
s = min(size, s)
|
|
shift, data, w = self.__streams[0].read(address, s)
|
|
assert not w
|
|
a, s = 0, size - s
|
|
else:
|
|
a, s = -s, size
|
|
if s:
|
|
u, v, missing = self.__streams[1].read(a, s)
|
|
if missing and _size == self._size:
|
|
raise ReadStreamError(s, a)
|
|
if shift is None:
|
|
shift = u
|
|
else:
|
|
assert not u
|
|
data += v
|
|
return shift, data, missing
|