gecko-dev/xpcom/ds/nsIByteBuffer.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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):
 *
 * 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 ***** */

#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_CONTRACTID "@mozilla.org/byte-buffer;1"
#define NS_BYTEBUFFER_CLASSNAME "Byte Buffer"

/** Interface to a buffer that holds bytes */
class nsIByteBuffer : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IBYTEBUFFER_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;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIByteBuffer, NS_IBYTEBUFFER_IID)

#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___ */