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156 lines
6.2 KiB
Plaintext
156 lines
6.2 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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*
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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 nsIUnicharInputStream;
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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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typedef NS_CALLBACK(nsWriteUnicharSegmentFun)(nsIUnicharInputStream *aInStream,
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void *aClosure,
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const PRUnichar *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 nsWriteUnicharSegmentFun(nsWriteUnicharSegmentFun);
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/**
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* Abstract unicode character input stream
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* @see nsIInputStream
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*/
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[scriptable, uuid(d5e3bd80-6723-4b92-b0c9-22f6162fd94f)]
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interface nsIUnicharInputStream : nsISupports {
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/**
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* Reads into a caller-provided character array.
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*
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* @return The number of characters that were successfully read. May be less
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* than aCount, even if there is more data in the input stream.
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* A return value of 0 means EOF.
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*
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* @note To read more than 2^32 characters, call this method multiple times.
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*/
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[noscript] unsigned long read([array, size_is(aCount)] in PRUnichar aBuf,
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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 characters 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 characters to be read
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*
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* @return number of characters 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
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*/
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[noscript] unsigned long readSegments(in nsWriteUnicharSegmentFun aWriter,
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in voidPtr aClosure,
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in unsigned long aCount);
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/**
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* Read into a string object.
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* @param aCount The number of characters that should be read
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* @return The number of characters that were read.
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*/
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unsigned long readString(in unsigned long aCount, out AString aString);
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/**
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* Close the stream and free associated resources. This also closes the
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* underlying stream, if any.
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*/
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void close();
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};
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%{C++
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#include "nsStringFwd.h"
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class nsIInputStream;
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/**
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* Create a nsIUnicharInputStream that wraps up a string. Data is fed
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* from the string out until the done. When this object is destroyed
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* it destroys the string by calling |delete| on the pointer if
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* aTakeOwnership is set. If aTakeOwnership is not set, you must
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* ensure that the string outlives the stream!
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*/
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extern NS_COM nsresult
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NS_NewStringUnicharInputStream(nsIUnicharInputStream** aInstancePtrResult,
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const nsAString* aString,
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PRBool aTakeOwnership);
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/**
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* Create a new nsUnicharInputStream that provides a converter for the
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* byte input stream aStreamToWrap. If no converter can be found then
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* nsnull is returned and the error code is set to
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* NS_INPUTSTREAM_NO_CONVERTER.
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*/
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extern NS_COM nsresult
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NS_NewUTF8ConverterStream(nsIUnicharInputStream** aInstancePtrResult,
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nsIInputStream* aStreamToWrap,
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PRInt32 aBufferSize = 0);
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%}
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