gecko-dev/xpcom/ds/nsIByteBuffer.h

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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 1.1 (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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIByteBuffer_h___
#define nsIByteBuffer_h___
#include "nscore.h"
#include "nsISupports.h"
class nsIInputStream;
#define NS_IBYTE_BUFFER_IID \
{ 0xe4a6e4b0, 0x93b4, 0x11d1, \
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
#define NS_IBYTEBUFFER_IID \
{ 0xe4a6e4b0, 0x93b4, 0x11d1, \
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
#define NS_BYTEBUFFER_PROGID "component://netscape/byte-buffer"
#define NS_BYTEBUFFER_CLASSNAME "Byte Buffer"
/** Interface to a buffer that holds bytes */
class nsIByteBuffer : public nsISupports {
public:
static const nsIID& GetIID() { static nsIID iid = NS_IBYTEBUFFER_IID; return iid; }
NS_IMETHOD Init(PRUint32 aBufferSize) = 0;
/** @return length of buffer, i.e. how many bytes are currently in it. */
NS_IMETHOD_(PRUint32) GetLength(void) const = 0;
/** @return number of bytes allocated in the buffer */
NS_IMETHOD_(PRUint32) GetBufferSize(void) const = 0;
/** @return the buffer */
NS_IMETHOD_(char*) GetBuffer(void) const = 0;
/** Grow buffer to aNewSize bytes. */
NS_IMETHOD_(PRBool) Grow(PRUint32 aNewSize) = 0;
/** Fill the buffer with data from aStream. Don't grow the buffer, only
* read until length of buffer equals buffer size. */
NS_IMETHOD_(PRInt32) Fill(nsresult* aErrorCode, nsIInputStream* aStream,
PRUint32 aKeep) = 0;
};
#define NS_BYTEBUFFER_CID \
{ /* a49d5280-0d6b-11d3-9331-00104ba0fd40 */ \
0xa49d5280, \
0x0d6b, \
0x11d3, \
{0x93, 0x31, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
}
/** Create a new byte buffer using the given buffer size. */
extern NS_COM nsresult
NS_NewByteBuffer(nsIByteBuffer** aInstancePtrResult,
nsISupports* aOuter,
PRUint32 aBufferSize = 0);
#endif /* nsIByteBuffer_h___ */