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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * 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 mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Warren Harris <warren@netscape.com>
+ * Darin Fisher <darin@netscape.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsISupports.idl"
+
+interface nsIOutputStream;
+interface nsIInputStream;
+
+%{C++
+/**
+ * The signature for the reader function passed to WriteSegments. This
+ * is the "provider" of data that gets written into the stream's buffer.
+ *
+ * @param aOutStream stream being written to
+ * @param aClosure opaque parameter passed to WriteSegments
+ * @param aToSegment pointer to memory owned by the output stream
+ * @param aFromOffset amount already written (since WriteSegments was called)
+ * @param aCount length of toSegment
+ * @param aReadCount number of bytes written
+ *
+ * Implementers should return the following:
+ *
+ * @return NS_OK and (*aReadCount > 0) if successfully provided some data
+ * @return NS_OK and (*aReadCount = 0) or
+ * @return <any-error> if not interested in providing any data
+ *
+ * Errors are never passed to the caller of WriteSegments.
+ *
+ * @status FROZEN
+ */
+typedef NS_CALLBACK(nsReadSegmentFun)(nsIOutputStream *aOutStream,
+ void *aClosure,
+ char *aToSegment,
+ PRUint32 aFromOffset,
+ PRUint32 aCount,
+ PRUint32 *aReadCount);
+%}
+
+native nsReadSegmentFun(nsReadSegmentFun);
+
+/**
+ * nsIOutputStream
+ *
+ * @status FROZEN
+ */
+[scriptable, uuid(0d0acd2a-61b4-11d4-9877-00c04fa0cf4a)]
+interface nsIOutputStream : nsISupports
+{
+ /**
+ * Close the stream. Forces the output stream to flush any buffered data.
+ *
+ * @throws NS_BASE_STREAM_WOULD_BLOCK if unable to flush without blocking
+ * the calling thread (non-blocking mode only)
+ */
+ void close();
+
+ /**
+ * Flush the stream.
+ *
+ * @throws NS_BASE_STREAM_WOULD_BLOCK if unable to flush without blocking
+ * the calling thread (non-blocking mode only)
+ */
+ void flush();
+
+ /**
+ * Write data into the stream.
+ *
+ * @param aBuf the buffer containing the data to be written
+ * @param aCount the maximum number of bytes to be written
+ *
+ * @return number of bytes written (may be less than aCount)
+ *
+ * @throws NS_BASE_STREAM_WOULD_BLOCK if writing to the output stream would
+ * block the calling thread (non-blocking mode only)
+ * @throws <other-error> on failure
+ */
+ unsigned long write(in string aBuf, in unsigned long aCount);
+
+ /**
+ * Writes data into the stream from an input stream.
+ *
+ * @param aFromStream the stream containing the data to be written
+ * @param aCount the maximum number of bytes to be written
+ *
+ * @return number of bytes written (may be less than aCount)
+ *
+ * @throws NS_BASE_STREAM_WOULD_BLOCK if writing to the output stream would
+ * block the calling thread (non-blocking mode only)
+ * @throws <other-error> on failure
+ *
+ * NOTE: This method is defined by this interface in order to allow the
+ * output stream to efficiently copy the data from the input stream into
+ * its internal buffer (if any). If this method was provided as an external
+ * facility, a separate char* buffer would need to be used in order to call
+ * the output stream's other Write method.
+ */
+ unsigned long writeFrom(in nsIInputStream aFromStream,
+ in unsigned long aCount);
+
+ /**
+ * Low-level write method that has access to the stream's underlying buffer.
+ * The reader function may be called multiple times for segmented buffers.
+ * WriteSegments is expected to keep calling the reader until either there
+ * is nothing left to write or the reader returns an error. WriteSegments
+ * should not call the reader with zero bytes to provide.
+ *
+ * @param aReader the "provider" of the data to be written
+ * @param aClosure opaque parameter passed to reader
+ * @param aCount the maximum number of bytes to be written
+ *
+ * @return number of bytes written (may be less than aCount)
+ *
+ * @throws NS_BASE_STREAM_WOULD_BLOCK if writing to the output stream would
+ * block the calling thread (non-blocking mode only)
+ * @throws <other-error> on failure
+ *
+ * NOTE: this function may be unimplemented if a stream has no underlying
+ * buffer (e.g., socket output stream).
+ */
+ [noscript] unsigned long writeSegments(in nsReadSegmentFun aReader,
+ in voidPtr aClosure,
+ in unsigned long aCount);
+
+ /**
+ * @return true if stream is non-blocking
+ *
+ * NOTE: writing to a blocking output stream will block the calling thread
+ * until all given data can be consumed by the stream.
+ */
+ boolean isNonBlocking();
+};