239 lines
6.9 KiB
Python
239 lines
6.9 KiB
Python
from __future__ import annotations
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from librespot.standard.Closeable import Closeable
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import sys
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import typing
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if typing.TYPE_CHECKING:
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from librespot.standard.OutputStream import OutputStream
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class InputStream(Closeable):
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max_skip_buffer_size: typing.Final[int] = 2048
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default_buffer_size: typing.Final[int] = 8192
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@staticmethod
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def null_input_stream():
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class Anonymous(InputStream):
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closed: bool
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def ensure_open(self) -> None:
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if self.closed:
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raise IOError("Stream closed")
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def available(self) -> int:
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self.ensure_open()
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return 0
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def read(self,
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b: bytearray = None,
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offset: int = None,
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length: int = None) -> int:
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if b is not None and offset is not None and length is not None:
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if len(b) < (offset + length):
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raise IndexError()
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if length == 0:
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return 0
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self.ensure_open()
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return -1
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if b is None and offset is None and length is None:
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self.ensure_open()
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return -1
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raise TypeError()
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def read_all_bytes(self):
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self.ensure_open()
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return bytearray(0)
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def read_n_bytes(self,
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b: bytearray = None,
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offset: int = None,
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length: int = None) -> bytearray:
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if length < 0:
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raise TypeError("length < 0")
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self.ensure_open()
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return bytearray(0)
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def skip(self, n) -> int:
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self.ensure_open()
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return 0
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def skip_n_bytes(self, n: int) -> None:
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self.ensure_open()
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if n > 0:
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raise EOFError()
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def transfer_to(self, out) -> int:
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if out is None:
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raise TypeError()
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self.ensure_open()
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return 0
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def close(self):
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self.closed = True
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return Anonymous()
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def internal_read(self):
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raise NotImplementedError()
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def read(self,
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b: bytearray = None,
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offset: int = None,
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length: int = None) -> int:
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if b is None and offset is None and length is None:
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return self.internal_read()
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if b is not None and offset is None and length is None:
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offset = 0
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length = len(b)
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elif not (b is not None and offset is not None and length is not None):
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raise TypeError()
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if len(b) < (offset + length):
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raise IndexError()
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if length == 0:
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return 0
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c = self.read()
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if c == -1:
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return -1
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b[offset] = c
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i = 1
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for i in range(i, length):
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c = self.read()
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if c == -1:
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break
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b[offset + i] = c
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return i
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max_buffer_size: typing.Final[int] = sys.maxsize - 8
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def read_all_bytes(self) -> bytearray:
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return self.read_n_bytes(length=sys.maxsize)
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def read_n_bytes(self,
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b: bytearray = None,
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offset: int = None,
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length: int = None) -> typing.Union[bytearray, int]:
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if b is None and offset is None and len is not None:
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if length < 0:
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raise TypeError("length < 0")
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bufs = None
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result = None
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total = 0
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remaining = length
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n: int
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while True:
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buf = bytearray(min(remaining, self.default_buffer_size))
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nread = 0
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while True:
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n = self.read(buf, nread, min(len(buf) - nread, remaining))
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if not n > 0:
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break
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nread += n
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remaining -= n
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if nread > 0:
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if self.max_buffer_size - total < nread:
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raise MemoryError("Required array size too large")
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total += nread
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if result is None:
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result = buf
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else:
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if bufs is None:
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bufs = [result]
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bufs.append(buf)
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if n >= 0 and remaining > 0:
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break
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if bufs is None:
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if result is None:
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return bytearray(0)
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return result if len(result) == total else result[:total]
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result = bytearray(total)
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offset = 0
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remaining = total
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for b in bufs:
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count = min(len(b), remaining)
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for i in range(offset, offset + count):
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result.insert(i, b[i])
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offset += count
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remaining -= count
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return result
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if b is not None and offset is not None and length is not None:
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if len(b) < (offset + length):
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raise IndexError()
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n = 0
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while n < length:
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count = self.read(b, offset + n, length - n)
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if count < 0:
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break
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n += count
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return n
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raise TypeError()
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def skip(self, n: int) -> int:
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remaining = n
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nr: int
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if n <= 0:
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return 0
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size = min(self.max_skip_buffer_size, remaining)
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skip_buffer = bytearray(size)
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while remaining > 0:
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nr = self.read(skip_buffer, 0, min(size, remaining))
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if nr < 0:
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break
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remaining -= nr
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return n - remaining
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def skip_n_bytes(self, n: int) -> None:
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if n > 0:
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ns = self.skip(n)
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if ns >= 0 and ns < n:
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n -= ns
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while n > 0 and self.read() != -1:
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n -= 1
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if n != 0:
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raise EOFError()
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elif ns != n:
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raise IOError("Unable to skip exactly")
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def available(self) -> int:
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return 0
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def close(self) -> None:
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pass
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def mark(self, read_limit: int) -> None:
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pass
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def reset(self) -> None:
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raise IOError("mark/reset not supported")
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def mark_supported(self) -> bool:
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return False
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def transfer_to(self, out: OutputStream) -> int:
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if out is None:
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raise TypeError()
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transferred = 0
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buffer = bytearray(self.default_buffer_size)
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read: int
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while True:
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read = self.read(buffer, 0, self.default_buffer_size)
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if not read:
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break
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out.write(buffer=buffer, offset=0, length=read)
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transferred += read
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return transferred
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