140 lines
5.2 KiB
Plaintext
140 lines
5.2 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Warren Harris <warren@netscape.com>
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* Darin Fisher <darin@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface nsIInputStream;
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%{C++
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/**
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* The signature of the writer function passed to ReadSegments. This
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* is the "consumer" of data that gets read from the stream's buffer.
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*
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* @param aInStream stream being read
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* @param aClosure opaque parameter passed to ReadSegments
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* @param aFromSegment pointer to memory owned by the input stream
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* @param aToOffset amount already read (since ReadSegments was called)
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* @param aCount length of fromSegment
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* @param aWriteCount number of bytes read
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*
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* Implementers should return the following:
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*
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* @return NS_OK and (*aWriteCount > 0) if consumed some data
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* @return <any-error> if not interested in consuming any data
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*
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* Errors are never passed to the caller of ReadSegments.
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*
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* NOTE: returning NS_OK and (*aWriteCount = 0) has undefined behavior.
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*
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* @status FROZEN
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*/
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typedef NS_CALLBACK(nsWriteSegmentFun)(nsIInputStream *aInStream,
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void *aClosure,
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const char *aFromSegment,
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PRUint32 aToOffset,
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PRUint32 aCount,
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PRUint32 *aWriteCount);
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%}
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native nsWriteSegmentFun(nsWriteSegmentFun);
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/**
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* nsIInputStream
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*
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* @status FROZEN
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*/
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[scriptable, uuid(fa9c7f6c-61b3-11d4-9877-00c04fa0cf4a)]
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interface nsIInputStream : nsISupports
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{
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/**
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* Close the stream.
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*/
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void close();
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/**
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* @return number of bytes currently available in the stream
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*/
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unsigned long available();
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/**
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* Read data from the stream.
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*
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* @param aBuf the buffer into which the data is to be read
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* @param aCount the maximum number of bytes to be read
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*
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* @return number of bytes read (may be less than aCount).
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* @return 0 if reached end of file
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*
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* @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would
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* block the calling thread (non-blocking mode only)
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* @throws <other-error> on failure
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*/
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[noscript] unsigned long read(in charPtr aBuf, in unsigned long aCount);
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/**
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* Low-level read method that has access to the stream's underlying buffer.
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* The writer function may be called multiple times for segmented buffers.
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* ReadSegments is expected to keep calling the writer until either there is
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* nothing left to read or the writer returns an error. ReadSegments should
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* not call the writer with zero bytes to consume.
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*
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* @param aWriter the "consumer" of the data to be read
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* @param aClosure opaque parameter passed to writer
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* @param aCount the maximum number of bytes to be read
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*
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* @return number of bytes read (may be less than aCount)
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* @return 0 if reached end of file (or if aWriter refused to consume data)
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*
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* @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would
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* block the calling thread (non-blocking mode only)
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* @throws <other-error> on failure
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*
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* NOTE: this function may be unimplemented if a stream has no underlying
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* buffer (e.g., socket input stream).
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*/
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[noscript] unsigned long readSegments(in nsWriteSegmentFun aWriter,
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in voidPtr aClosure,
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in unsigned long aCount);
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/**
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* @return true if stream is non-blocking
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*/
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boolean isNonBlocking();
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};
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