streamutils.cpp

nsis是一个流传比较广的程序安装和解安装封装软件

/*
 * StreamUtils.cpp
 * 
 * This file is a part of LZMA compression module for NSIS.
 * 
 * Original LZMA SDK Copyright (C) 1999-2006 Igor Pavlov
 * Modifications Copyright (C) 2003-2006 Amir Szekely <[e-mail]>
 * 
 * Licensed under the Common Public License version 1.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 * Licence details can be found in the file COPYING.
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.
 */

#include "StdAfx.h"

#include "../../Common/MyCom.h"
#include "StreamUtils.h"

HRESULT ReadStream(ISequentialInStream *stream, void *data, UInt32 size, UInt32 *processedSize)
{
  if (processedSize != 0)
    *processedSize = 0;
  while(size != 0)
  {
    UInt32 processedSizeLoc; 
    HRESULT res = stream->Read(data, size, &processedSizeLoc);
    if (processedSize != 0)
      *processedSize += processedSizeLoc;
    data = (Byte *)((Byte *)data + processedSizeLoc);
    size -= processedSizeLoc;
    RINOK(res);
    if (processedSizeLoc == 0)
      return S_OK;
  }
  return S_OK;
}

HRESULT WriteStream(ISequentialOutStream *stream, const void *data, UInt32 size, UInt32 *processedSize)
{
  if (processedSize != 0)
    *processedSize = 0;
  while(size != 0)
  {
    UInt32 processedSizeLoc; 
    HRESULT res = stream->Write(data, size, &processedSizeLoc);
    if (processedSize != 0)
      *processedSize += processedSizeLoc;
    data = (const void *)((const Byte *)data + processedSizeLoc);
    size -= processedSizeLoc;
    RINOK(res);
    if (processedSizeLoc == 0)
      break;
  }
  return S_OK;
}