154 lines
5.3 KiB
C++
154 lines
5.3 KiB
C++
/*
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---------------------------------------------------------------------------
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Open Asset Import Library (assimp)
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---------------------------------------------------------------------------
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Copyright (c) 2006-2019, 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 following
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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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/** @file DefaultIOStream.cpp
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* @brief Default File I/O implementation for #Importer
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*/
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#include <assimp/ai_assert.h>
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#include <assimp/DefaultIOStream.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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using namespace Assimp;
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// ----------------------------------------------------------------------------------
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DefaultIOStream::~DefaultIOStream()
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{
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if (mFile) {
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::fclose(mFile);
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mFile = nullptr;
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}
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}
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// ----------------------------------------------------------------------------------
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size_t DefaultIOStream::Read(void* pvBuffer,
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size_t pSize,
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size_t pCount)
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{
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ai_assert(NULL != pvBuffer && 0 != pSize && 0 != pCount);
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return (mFile ? ::fread(pvBuffer, pSize, pCount, mFile) : 0);
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}
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// ----------------------------------------------------------------------------------
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size_t DefaultIOStream::Write(const void* pvBuffer,
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size_t pSize,
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size_t pCount)
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{
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ai_assert(NULL != pvBuffer && 0 != pSize && 0 != pCount);
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return (mFile ? ::fwrite(pvBuffer, pSize, pCount, mFile) : 0);
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}
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// ----------------------------------------------------------------------------------
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aiReturn DefaultIOStream::Seek(size_t pOffset,
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aiOrigin pOrigin)
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{
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if (!mFile) {
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return AI_FAILURE;
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}
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// Just to check whether our enum maps one to one with the CRT constants
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static_assert(aiOrigin_CUR == SEEK_CUR &&
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aiOrigin_END == SEEK_END && aiOrigin_SET == SEEK_SET, "aiOrigin_CUR == SEEK_CUR && \
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aiOrigin_END == SEEK_END && aiOrigin_SET == SEEK_SET");
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// do the seek
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return (0 == ::fseek(mFile, (long)pOffset,(int)pOrigin) ? AI_SUCCESS : AI_FAILURE);
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}
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// ----------------------------------------------------------------------------------
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size_t DefaultIOStream::Tell() const
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{
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if (!mFile) {
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return 0;
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}
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return ::ftell(mFile);
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}
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// ----------------------------------------------------------------------------------
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size_t DefaultIOStream::FileSize() const
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{
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if (! mFile || mFilename.empty()) {
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return 0;
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}
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if (SIZE_MAX == mCachedSize ) {
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// Although fseek/ftell would allow us to reuse the existing file handle here,
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// it is generally unsafe because:
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// - For binary streams, it is not technically well-defined
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// - For text files the results are meaningless
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// That's why we use the safer variant fstat here.
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//
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// See here for details:
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// https://www.securecoding.cert.org/confluence/display/seccode/FIO19-C.+Do+not+use+fseek()+and+ftell()+to+compute+the+size+of+a+regular+file
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#if defined _WIN32 && (!defined __GNUC__ || __MSVCRT_VERSION__ >= 0x0601)
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struct __stat64 fileStat;
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//using fileno + fstat avoids having to handle the filename
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int err = _fstat64( _fileno(mFile), &fileStat );
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if (0 != err)
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return 0;
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mCachedSize = (size_t) (fileStat.st_size);
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#elif defined __GNUC__ || defined __APPLE__ || defined __MACH__ || defined __FreeBSD__
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struct stat fileStat;
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int err = stat(mFilename.c_str(), &fileStat );
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if (0 != err)
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return 0;
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const unsigned long long cachedSize = fileStat.st_size;
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mCachedSize = static_cast< size_t >( cachedSize );
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#else
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# error "Unknown platform"
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#endif
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}
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return mCachedSize;
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}
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// ----------------------------------------------------------------------------------
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void DefaultIOStream::Flush()
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{
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if (mFile) {
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::fflush(mFile);
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}
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}
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// ----------------------------------------------------------------------------------
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