Mozilla/mozilla/extensions/python/xpcom/src/PyGInputStream.cpp

/*
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The Original Code is the Python XPCOM language bindings.
 *
 * The Initial Developer of the Original Code is ActiveState Tool Corp.
 * Portions created by ActiveState Tool Corp. are Copyright (C) 2000, 2001
 * ActiveState Tool Corp.  All Rights Reserved.
 *
 * Contributor(s): Mark Hammond <MarkH@ActiveState.com> (original author)
 *
 */

// PyGInputStream.cpp
//
// This code is part of the XPCOM extensions for Python.
//
// Written October 2000 by Mark Hammond.
//
// Based heavily on the Python COM support, which is
// (c) Mark Hammond and Greg Stein.
//
// (c) 2000, ActiveState corp.

#include "PyXPCOM_std.h"
#include <nsIInputStream.h>

class PyG_nsIInputStream : public PyG_Base, public nsIInputStream
{
public:
	PyG_nsIInputStream(PyObject *instance) : PyG_Base(instance, NS_GET_IID(nsIInputStream)) {;}
	PYGATEWAY_BASE_SUPPORT(nsIInputStream, PyG_Base);

	NS_IMETHOD Close(void);
	NS_IMETHOD Available(PRUint32 *_retval);
	NS_IMETHOD Read(char * buf, PRUint32 count, PRUint32 *_retval);
	NS_IMETHOD ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval);
	NS_IMETHOD GetNonBlocking(PRBool *aNonBlocking);
	NS_IMETHOD GetObserver(nsIInputStreamObserver * *aObserver);
	NS_IMETHOD SetObserver(nsIInputStreamObserver * aObserver);
};


PyG_Base *MakePyG_nsIInputStream(PyObject *instance)
{
	return new PyG_nsIInputStream(instance);
}

NS_IMETHODIMP
PyG_nsIInputStream::Close()
{
	CEnterLeavePython _celp;
	const char *methodName = "close";
	return InvokeNativeViaPolicy(methodName, NULL);
}

NS_IMETHODIMP
PyG_nsIInputStream::Available(PRUint32 *_retval)
{
	NS_PRECONDITION(_retval, "null pointer");
	CEnterLeavePython _celp;
	PyObject *ret;
	const char *methodName = "available";
	nsresult nr = InvokeNativeViaPolicy(methodName, &ret);
	if (NS_SUCCEEDED(nr)) {
		*_retval = PyInt_AsLong(ret);
		if (PyErr_Occurred())
			nr = HandleNativeGatewayError(methodName);
		Py_XDECREF(ret);
	}
	return nr;
}

NS_IMETHODIMP
PyG_nsIInputStream::Read(char * buf, PRUint32 count, PRUint32 *_retval)
{
	NS_PRECONDITION(_retval, "null pointer");
	NS_PRECONDITION(buf, "null pointer");
	CEnterLeavePython _celp;
	PyObject *ret;
	const char *methodName = "read";
	nsresult nr = InvokeNativeViaPolicy(methodName, &ret, "i", count);
	if (NS_SUCCEEDED(nr)) {
		PRUint32 py_size;
		const void *py_buf;
		if (PyObject_AsReadBuffer(ret, &py_buf, (int *)&py_size)!=0) {
			PyErr_Format(PyExc_TypeError, "nsIInputStream::read() method must return a buffer object - not a '%s' object", ret->ob_type->tp_name);
			nr = HandleNativeGatewayError(methodName);
		} else {
			if (py_size > count) {
				PyXPCOM_LogWarning("nsIInputStream::read() was asked for %d bytes, but the string returned is %d bytes - truncating!\n", count, py_size);
				py_size = count;
			}
			memcpy(buf, py_buf, py_size);
			*_retval = py_size;
		}
	}
	return nr;
}


NS_IMETHODIMP
PyG_nsIInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval)
{
	NS_WARNING("ReadSegments() not implemented!!!");
	return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
PyG_nsIInputStream::GetNonBlocking(PRBool *aNonBlocking)
{
	NS_PRECONDITION(aNonBlocking, "null pointer");
	CEnterLeavePython _celp;
	PyObject *ret;
	const char *propName = "nonBlocking";
	nsresult nr = InvokeNativeGetViaPolicy(propName, &ret);
	if (NS_SUCCEEDED(nr)) {
		*aNonBlocking = PyInt_AsLong(ret);
		if (PyErr_Occurred())
			nr = HandleNativeGatewayError(propName);
		Py_XDECREF(ret);
	}
	return nr;
}

NS_IMETHODIMP
PyG_nsIInputStream::GetObserver(nsIInputStreamObserver * *aObserver)
{
	NS_PRECONDITION(aObserver, "null pointer");
	CEnterLeavePython _celp;
	PyObject *ret;
	const char *propName = "observer";
	nsresult nr = InvokeNativeGetViaPolicy(propName, &ret);
	if (NS_SUCCEEDED(nr)) {
		Py_nsISupports::InterfaceFromPyObject(ret, NS_GET_IID(nsIInputStreamObserver), (nsISupports **)aObserver, PR_FALSE);
		if (PyErr_Occurred())
			nr = HandleNativeGatewayError(propName);
	}
	return nr;
}

NS_IMETHODIMP
PyG_nsIInputStream::SetObserver(nsIInputStreamObserver * aObserver)
{
	CEnterLeavePython _celp;
	const char *propName = "observer";
	PyObject *obObserver = MakeInterfaceParam(aObserver, &NS_GET_IID(nsIInputStreamObserver));
	if (obObserver==NULL)
		return HandleNativeGatewayError(propName);
	nsresult nr = InvokeNativeSetViaPolicy(propName, obObserver);
	Py_DECREF(obObserver);
	return nr;
}