www.gusucode.com > 一个制作安装程序的VC++软件源码源码程序 > 一个制作安装程序的VC++软件源码/Nsis.v2.41.Full.Source/Nsis.v2.41.Full.Source/Source/7zip/7zip/Common/InBuffer.cpp
/* * InBuffer.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 <kichik@netvision.net.il> * * 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 "InBuffer.h" #include "../../Common/Alloc.h" CInBuffer::CInBuffer(): _buffer(0), _bufferLimit(0), _bufferBase(0), _stream(0), _bufferSize(0) {} bool CInBuffer::Create(UInt32 bufferSize) { const UInt32 kMinBlockSize = 1; if (bufferSize < kMinBlockSize) bufferSize = kMinBlockSize; if (_bufferBase != 0 && _bufferSize == bufferSize) return true; Free(); _bufferSize = bufferSize; _bufferBase = (Byte *)::MidAlloc(bufferSize); return (_bufferBase != 0); } void CInBuffer::Free() { ::MidFree(_bufferBase); _bufferBase = 0; } void CInBuffer::SetStream(ISequentialInStream *stream) { _stream = stream; } void CInBuffer::Init() { _processedSize = 0; _buffer = _bufferBase; _bufferLimit = _buffer; _wasFinished = false; #ifdef _NO_EXCEPTIONS ErrorCode = S_OK; #endif } bool CInBuffer::ReadBlock() { #ifdef _NO_EXCEPTIONS if (ErrorCode != S_OK) return false; #endif if (_wasFinished) return false; _processedSize += (_buffer - _bufferBase); UInt32 numProcessedBytes; HRESULT result = _stream->Read(_bufferBase, _bufferSize, &numProcessedBytes); #ifdef _NO_EXCEPTIONS ErrorCode = result; #else if (result != S_OK) throw CInBufferException(result); #endif _buffer = _bufferBase; _bufferLimit = _buffer + numProcessedBytes; _wasFinished = (numProcessedBytes == 0); return (!_wasFinished); } Byte CInBuffer::ReadBlock2() { if(!ReadBlock()) return 0xFF; return *_buffer++; }