Class _StreamProxy

Lib/tarfile.py:582–608

Small proxy class that enables transparent compression detection for the Stream interface (mode 'r|*').

# class _Stream

class _StreamProxy(object):
    """Small proxy class that enables transparent compression
       detection for the Stream interface (mode 'r|*').
    """

    def __init__(self, fileobj):
        self.fileobj = fileobj
        self.buf = self.fileobj.read(BLOCKSIZE)

    def read(self, size):
        self.read = self.fileobj.read
        return self.buf

    def getcomptype(self):
        if self.buf.startswith(b"\x1f\x8b\x08"):
            return "gz"
        elif self.buf[0:3] == b"BZh" and self.buf[4:10] == b"1AY&SY":
            return "bz2"
        elif self.buf.startswith((b"\x5d\x00\x00\x80", b"\xfd7zXZ")):
            return "xz"
        elif self.buf.startswith(b"\x28\xb5\x2f\xfd"):
            return "zst"
        else:
            return "tar"

    def close(self):
        self.fileobj.close()
# class StreamProxy

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