353 lines
8.9 KiB
C++
353 lines
8.9 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2022, 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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#pragma once
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#ifndef AI_IOSTREAMBUFFER_H_INC
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#define AI_IOSTREAMBUFFER_H_INC
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#ifdef __GNUC__
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#pragma GCC system_header
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#endif
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#include <assimp/ParsingUtils.h>
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#include <assimp/types.h>
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#include <assimp/IOStream.hpp>
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#include <vector>
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namespace Assimp {
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// ---------------------------------------------------------------------------
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/**
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* Implementation of a cached stream buffer.
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*/
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template <class T>
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class IOStreamBuffer {
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public:
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/// @brief The class constructor.
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IOStreamBuffer(size_t cache = 4096 * 4096);
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/// @brief The class destructor.
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~IOStreamBuffer();
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/// @brief Will open the cached access for a given stream.
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/// @param stream The stream to cache.
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/// @return true if successful.
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bool open(IOStream *stream);
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/// @brief Will close the cached access.
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/// @return true if successful.
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bool close();
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/// @brief Returns the file-size.
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/// @return The file-size.
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size_t size() const;
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/// @brief Returns the cache size.
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/// @return The cache size.
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size_t cacheSize() const;
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/// @brief Will read the next block.
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/// @return true if successful.
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bool readNextBlock();
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/// @brief Returns the number of blocks to read.
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/// @return The number of blocks.
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size_t getNumBlocks() const;
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/// @brief Returns the current block index.
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/// @return The current block index.
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size_t getCurrentBlockIndex() const;
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/// @brief Returns the current file pos.
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/// @return The current file pos.
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size_t getFilePos() const;
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/// @brief Will read the next line.
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/// @param buffer The buffer for the next line.
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/// @return true if successful.
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bool getNextDataLine(std::vector<T> &buffer, T continuationToken);
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/// @brief Will read the next line ascii or binary end line char.
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/// @param buffer The buffer for the next line.
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/// @return true if successful.
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bool getNextLine(std::vector<T> &buffer);
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/// @brief Will read the next block.
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/// @param buffer The buffer for the next block.
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/// @return true if successful.
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bool getNextBlock(std::vector<T> &buffer);
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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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size_t m_numBlocks;
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size_t m_blockIdx;
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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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template <class T>
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AI_FORCE_INLINE IOStreamBuffer<T>::IOStreamBuffer(size_t cache) :
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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_numBlocks(0),
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m_blockIdx(0),
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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(), '\n');
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}
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template <class T>
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AI_FORCE_INLINE IOStreamBuffer<T>::~IOStreamBuffer() {
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// empty
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}
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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::open(IOStream *stream) {
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// file still opened!
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if (nullptr != m_stream) {
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return false;
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}
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// Invalid stream pointer
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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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if (m_filesize < m_cacheSize) {
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m_cacheSize = m_filesize;
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}
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m_numBlocks = m_filesize / m_cacheSize;
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if ((m_filesize % m_cacheSize) > 0) {
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m_numBlocks++;
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}
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return true;
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}
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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::close() {
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if (nullptr == m_stream) {
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return false;
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}
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// init counters and state vars
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m_stream = nullptr;
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m_filesize = 0;
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m_numBlocks = 0;
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m_blockIdx = 0;
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m_cachePos = 0;
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m_filePos = 0;
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return true;
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}
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template <class T>
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AI_FORCE_INLINE
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size_t
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IOStreamBuffer<T>::size() const {
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return m_filesize;
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}
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template <class T>
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AI_FORCE_INLINE
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size_t
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IOStreamBuffer<T>::cacheSize() const {
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return m_cacheSize;
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}
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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::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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if (readLen < m_cacheSize) {
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m_cacheSize = readLen;
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}
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m_filePos += m_cacheSize;
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m_cachePos = 0;
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m_blockIdx++;
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return true;
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}
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template <class T>
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AI_FORCE_INLINE size_t IOStreamBuffer<T>::getNumBlocks() const {
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return m_numBlocks;
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}
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template <class T>
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AI_FORCE_INLINE size_t IOStreamBuffer<T>::getCurrentBlockIndex() const {
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return m_blockIdx;
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}
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template <class T>
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AI_FORCE_INLINE size_t IOStreamBuffer<T>::getFilePos() const {
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return m_filePos;
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}
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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextDataLine(std::vector<T> &buffer, T continuationToken) {
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buffer.resize(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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for (;;) {
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if (continuationToken == m_cache[m_cachePos] && IsLineEnd(m_cache[m_cachePos + 1])) {
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++m_cachePos;
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while (m_cache[m_cachePos] != '\n') {
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++m_cachePos;
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}
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++m_cachePos;
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} else if (IsLineEnd(m_cache[m_cachePos])) {
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break;
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}
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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(i == buffer.size()) {
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buffer.resize(buffer.size() * 2);
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}
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if (m_cachePos >= size()) {
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break;
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}
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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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static AI_FORCE_INLINE bool isEndOfCache(size_t pos, size_t cacheSize) {
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return (pos == cacheSize);
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}
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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextLine(std::vector<T> &buffer) {
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buffer.resize(m_cacheSize);
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if (isEndOfCache(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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if (IsLineEnd(m_cache[m_cachePos])) {
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// skip line end
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while (m_cache[m_cachePos] != '\n') {
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++m_cachePos;
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}
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++m_cachePos;
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if (isEndOfCache(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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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(i == buffer.size()) {
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buffer.resize(buffer.size() * 2);
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}
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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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template <class T>
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AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextBlock(std::vector<T> &buffer) {
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// Return the last block-value if getNextLine was used before
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if (0 != m_cachePos) {
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buffer = std::vector<T>(m_cache.begin() + m_cachePos, m_cache.end());
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m_cachePos = 0;
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} else {
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if (!readNextBlock()) {
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return false;
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}
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buffer = std::vector<T>(m_cache.begin(), m_cache.end());
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}
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return true;
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}
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} // namespace Assimp
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#endif // AI_IOSTREAMBUFFER_H_INC
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