Pyglobus change/bug fix

[Ivan R. Judson]

Hey,

In io.py, GSIFile.read(self, size=0, waitForBytes=1):

waitForBytes is not a flag, but a quantity (according to globus_io_read.c),
which makes it possible to have the GSIFile have the same semantics as any
standard file by simply adding:

if waitForBytes == 1:
    waitForBytes = size

As the first thing that is done in the method, it turns into:

    def read(self, size=0,waitForBytes=1):
        """
        Read size bytes, returning a string.
        """
        if waitForBytes == 1:
            waitForBytes = size
        if self.readok == 0:
            raise IOError, "File not open for reading"
        if size == 0:
            size = self.rbuf.get_size()
        if waitForBytes > size:
	    raise RuntimeError, "waitForBytes is larger than buffer_size" 
        elif self.rbuf.get_size() < size:
            del(self.rbuf)
            self.rbuf = Buffer(size)
         
        nbytes = self.sock.read(self.rbuf, size, waitForBytes)
        if nbytes < 1:
            return ""
        return self.rbuf.as_string(nbytes)

This makes life a lot easier, and correctly represents what the underlying
globus call means.

Can this be added to cvs?

--Ivan