pjs/xpcom/io/nsIUnicharInputStream.h

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3.4 KiB
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIUnicharInputStream_h___
#define nsIUnicharInputStream_h___
#include "nsIInputStream.h"
class nsString;
#define NS_IUNICHAR_INPUT_STREAM_IID \
{ 0x2d97fbf0, 0x93b5, 0x11d1, \
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
#define NS_IB2UCONVERTER_IID \
{ 0x35e40290, 0x93b5, 0x11d1, \
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
/// Enumeration of character set ids.
enum nsCharSetID {
eCharSetID_IsoLatin1 = 0,
eCharSetID_UTF8,
eCharSetID_ShiftJis
// XXX more i'm sure...
};
/** Abstract unicode character input stream
* @see nsIInputStream
*/
class nsIUnicharInputStream : public nsISupports {
public:
virtual PRInt32 Read(PRInt32* aErrorCode,
PRUnichar* aBuf,
PRInt32 aOffset,
PRInt32 aCount) = 0;
virtual void Close() = 0;
};
/**
* Create a nsIUnicharInputStream that wraps up a string. Data is fed
* from the string out until the done. When this object is destroyed
* it destroyes the string (so make a copy if you don't want it doing
* that)
*/
extern NS_BASE nsresult
NS_NewStringUnicharInputStream(nsIUnicharInputStream** aInstancePtrResult,
nsString* aString);
/// Abstract interface for converting from bytes to unicode characters
class nsIB2UConverter : public nsISupports {
public:
/** aDstLen is updated to indicate how much data was translated into
* aDst; aSrcLen is updated to indicate how much data was used in
* the source buffer.
*/
virtual PRInt32 Convert(PRUnichar* aDst,
PRInt32 aDstOffset,
PRInt32& aDstLen,
const char* aSrc,
PRInt32 aSrcOffset,
PRInt32& aSrcLen) = 0;
};
/** Create a new nsUnicharInputStream that provides a converter for the
* byte input stream aStreamToWrap. If no converter can be found then
* nsnull is returned and the error code is set to
* NS_INPUTSTREAM_NO_CONVERTER.
*/
extern NS_BASE nsresult
NS_NewConverterStream(nsIUnicharInputStream** aInstancePtrResult,
nsISupports* aOuter,
nsIInputStream* aStreamToWrap,
PRInt32 aBufferSize = 0,
nsCharSetID aCharSet = eCharSetID_IsoLatin1);
/** Create a new nsB2UConverter for the given character set. When given
* nsnull, the converter for iso-latin1 to unicode is provided. If no
* converter can be found, nsnull is returned.
*/
extern NS_BASE nsresult
NS_NewB2UConverter(nsIB2UConverter** aInstancePtrResult,
nsISupports* aOuter,
nsCharSetID aCharSet = eCharSetID_IsoLatin1);
#endif /* nsUnicharInputStream_h___ */