140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
#pragma once
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/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2016, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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#include <assimp/types.h>
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#include <iostream>
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namespace Assimp {
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class IOStream;
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template<class T>
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class IOStreamBuffer {
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public:
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IOStreamBuffer( size_t cache = 4096 )
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: m_stream( nullptr )
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, m_filesize( 0 )
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, m_cacheSize( cache )
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, m_cachePos( 0 )
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, m_filePos( 0 ) {
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m_cache.resize( cache );
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std::fill( m_cache.begin(), m_cache.end(), '\0' );
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}
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~IOStreamBuffer() {
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}
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bool open( IOStream *stream ) {
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if ( nullptr == stream ) {
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return false;
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}
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m_stream = stream;
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m_filesize = m_stream->FileSize();
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if ( m_filesize == 0 ) {
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return false;
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}
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return true;
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}
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bool close() {
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if ( nullptr == m_stream ) {
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return false;
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}
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m_stream = nullptr;
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m_filesize =0;
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return true;
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}
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size_t size() const {
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return m_filesize;
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}
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bool readNextBlock() {
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m_stream->Seek( m_filePos, aiOrigin_SET );
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size_t readLen = m_stream->Read( &m_cache[ 0 ], sizeof( T ), m_cacheSize );
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if ( readLen == 0 ) {
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return false;
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}
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m_filePos += m_cacheSize;
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m_cachePos = 0;
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return true;
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}
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bool getNextLine( std::vector<T> &buffer ) {
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buffer.resize( m_cacheSize );
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::memset( &buffer[ 0 ], ' ', m_cacheSize );
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if ( m_cachePos == m_cacheSize || 0 == m_filePos ) {
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if ( !readNextBlock() ) {
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return false;
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}
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}
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size_t i = 0;
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while ( !IsLineEnd( m_cache[ m_cachePos ] ) ) {
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buffer[ i ] = m_cache[ m_cachePos ];
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m_cachePos++;
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i++;
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if ( m_cachePos >= m_cacheSize ) {
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if ( !readNextBlock() ) {
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return false;
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}
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}
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}
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buffer[ i ]='\n';
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m_cachePos++;
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return true;
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}
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private:
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IOStream *m_stream;
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size_t m_filesize;
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size_t m_cacheSize;
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std::vector<T> m_cache;
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size_t m_cachePos;
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size_t m_filePos;
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};
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} // !ns Assimp
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