279 lines
6.9 KiB
C++
279 lines
6.9 KiB
C++
#pragma once
|
|
|
|
/*
|
|
Open Asset Import Library (assimp)
|
|
----------------------------------------------------------------------
|
|
|
|
Copyright (c) 2006-2017, assimp team
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use of this software in source and binary forms,
|
|
with or without modification, are permitted provided that the
|
|
following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer in the documentation and/or other
|
|
materials provided with the distribution.
|
|
|
|
* Neither the name of the assimp team, nor the names of its
|
|
contributors may be used to endorse or promote products
|
|
derived from this software without specific prior
|
|
written permission of the assimp team.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
#include <assimp/types.h>
|
|
#include <assimp/IOStream.hpp>
|
|
#include "ParsingUtils.h"
|
|
|
|
#include <vector>
|
|
|
|
namespace Assimp {
|
|
|
|
// ---------------------------------------------------------------------------
|
|
/**
|
|
* Implementation of a cached stream buffer.
|
|
*/
|
|
template<class T>
|
|
class IOStreamBuffer {
|
|
public:
|
|
/// @brief The class constructor.
|
|
IOStreamBuffer( size_t cache = 4096 * 4096 );
|
|
|
|
/// @brief The class destructor.
|
|
~IOStreamBuffer();
|
|
|
|
/// @brief Will open the cached access for a given stream.
|
|
/// @param stream The stream to cache.
|
|
/// @return true if successful.
|
|
bool open( IOStream *stream );
|
|
|
|
/// @brief Will close the cached access.
|
|
/// @return true if successful.
|
|
bool close();
|
|
|
|
/// @brief Returns the file-size.
|
|
/// @return The file-size.
|
|
size_t size() const;
|
|
|
|
/// @brief Returns the cache size.
|
|
/// @return The cache size.
|
|
size_t cacheSize() const;
|
|
|
|
/// @brief Will read the next block.
|
|
/// @return true if successful.
|
|
bool readNextBlock();
|
|
|
|
/// @brief Returns the number of blocks to read.
|
|
/// @return The number of blocks.
|
|
size_t getNumBlocks() const;
|
|
|
|
/// @brief Returns the current block index.
|
|
/// @return The current block index.
|
|
size_t getCurrentBlockIndex() const;
|
|
|
|
/// @brief Returns the current file pos.
|
|
/// @return The current file pos.
|
|
size_t getFilePos() const;
|
|
|
|
/// @brief Will read the next line.
|
|
/// @param buffer The buffer for the next line.
|
|
/// @return true if successful.
|
|
bool getNextDataLine( std::vector<T> &buffer, T continuationToken );
|
|
|
|
private:
|
|
IOStream *m_stream;
|
|
size_t m_filesize;
|
|
size_t m_cacheSize;
|
|
size_t m_numBlocks;
|
|
size_t m_blockIdx;
|
|
std::vector<T> m_cache;
|
|
size_t m_cachePos;
|
|
size_t m_filePos;
|
|
};
|
|
|
|
template<class T>
|
|
inline
|
|
IOStreamBuffer<T>::IOStreamBuffer( size_t cache )
|
|
: m_stream( nullptr )
|
|
, m_filesize( 0 )
|
|
, m_cacheSize( cache )
|
|
, m_numBlocks( 0 )
|
|
, m_blockIdx( 0 )
|
|
, m_cachePos( 0 )
|
|
, m_filePos( 0 ) {
|
|
m_cache.resize( cache );
|
|
std::fill( m_cache.begin(), m_cache.end(), '\n' );
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
IOStreamBuffer<T>::~IOStreamBuffer() {
|
|
// empty
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
bool IOStreamBuffer<T>::open( IOStream *stream ) {
|
|
// file still opened!
|
|
if ( nullptr != m_stream ) {
|
|
return false;
|
|
}
|
|
|
|
// Invalid stream pointer
|
|
if ( nullptr == stream ) {
|
|
return false;
|
|
}
|
|
|
|
m_stream = stream;
|
|
m_filesize = m_stream->FileSize();
|
|
if ( m_filesize == 0 ) {
|
|
return false;
|
|
}
|
|
if ( m_filesize < m_cacheSize ) {
|
|
m_cacheSize = m_filesize;
|
|
}
|
|
|
|
m_numBlocks = m_filesize / m_cacheSize;
|
|
if ( ( m_filesize % m_cacheSize ) > 0 ) {
|
|
m_numBlocks++;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
bool IOStreamBuffer<T>::close() {
|
|
if ( nullptr == m_stream ) {
|
|
return false;
|
|
}
|
|
|
|
// init counters and state vars
|
|
m_stream = nullptr;
|
|
m_filesize = 0;
|
|
m_numBlocks = 0;
|
|
m_blockIdx = 0;
|
|
m_cachePos = 0;
|
|
m_filePos = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
size_t IOStreamBuffer<T>::size() const {
|
|
return m_filesize;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
size_t IOStreamBuffer<T>::cacheSize() const {
|
|
return m_cacheSize;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
bool IOStreamBuffer<T>::readNextBlock() {
|
|
m_stream->Seek( m_filePos, aiOrigin_SET );
|
|
size_t readLen = m_stream->Read( &m_cache[ 0 ], sizeof( T ), m_cacheSize );
|
|
if ( readLen == 0 ) {
|
|
return false;
|
|
}
|
|
if ( readLen < m_cacheSize ) {
|
|
m_cacheSize = readLen;
|
|
}
|
|
m_filePos += m_cacheSize;
|
|
m_cachePos = 0;
|
|
m_blockIdx++;
|
|
|
|
return true;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
size_t IOStreamBuffer<T>::getNumBlocks() const {
|
|
return m_numBlocks;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
size_t IOStreamBuffer<T>::getCurrentBlockIndex() const {
|
|
return m_blockIdx;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
size_t IOStreamBuffer<T>::getFilePos() const {
|
|
return m_filePos;
|
|
}
|
|
|
|
template<class T>
|
|
inline
|
|
bool IOStreamBuffer<T>::getNextDataLine( std::vector<T> &buffer, T continuationToken ) {
|
|
buffer.resize( m_cacheSize );
|
|
//std::fill( buffer.begin(), buffer.end(), ' ' );
|
|
if ( m_cachePos == m_cacheSize || 0 == m_filePos ) {
|
|
if ( !readNextBlock() ) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool continuationFound( false ), endOfDataLine( false );
|
|
size_t i = 0;
|
|
while ( !endOfDataLine ) {
|
|
if ( continuationToken == m_cache[ m_cachePos ] ) {
|
|
continuationFound = true;
|
|
++m_cachePos;
|
|
}
|
|
if ( IsLineEnd( m_cache[ m_cachePos ] ) ) {
|
|
if ( !continuationFound ) {
|
|
// the end of the data line
|
|
break;
|
|
} else {
|
|
// skip line end
|
|
while ( m_cache[m_cachePos] != '\n') {
|
|
++m_cachePos;
|
|
}
|
|
++m_cachePos;
|
|
continuationFound = false;
|
|
}
|
|
}
|
|
|
|
buffer[ i ] = m_cache[ m_cachePos ];
|
|
m_cachePos++;
|
|
i++;
|
|
if ( m_cachePos >= m_cacheSize ) {
|
|
if ( !readNextBlock() ) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
buffer[ i ] = '\n';
|
|
m_cachePos++;
|
|
|
|
return true;
|
|
}
|
|
|
|
} // !ns Assimp
|