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Diffstat (limited to 'thirdparty/assimp/code/Common/DefaultIOStream.cpp')
| -rw-r--r-- | thirdparty/assimp/code/Common/DefaultIOStream.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/thirdparty/assimp/code/Common/DefaultIOStream.cpp b/thirdparty/assimp/code/Common/DefaultIOStream.cpp new file mode 100644 index 0000000000..1c100b6189 --- /dev/null +++ b/thirdparty/assimp/code/Common/DefaultIOStream.cpp @@ -0,0 +1,154 @@ +/* +--------------------------------------------------------------------------- +Open Asset Import Library (assimp) +--------------------------------------------------------------------------- + +Copyright (c) 2006-2019, 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. +--------------------------------------------------------------------------- +*/ +/** @file DefaultIOStream.cpp + * @brief Default File I/O implementation for #Importer + */ + + +#include <assimp/ai_assert.h> +#include <assimp/DefaultIOStream.h> +#include <sys/types.h> +#include <sys/stat.h> + +using namespace Assimp; + +// ---------------------------------------------------------------------------------- +DefaultIOStream::~DefaultIOStream() +{ + if (mFile) { + ::fclose(mFile); + mFile = nullptr; + } +} + +// ---------------------------------------------------------------------------------- +size_t DefaultIOStream::Read(void* pvBuffer, + size_t pSize, + size_t pCount) +{ + ai_assert(NULL != pvBuffer && 0 != pSize && 0 != pCount); + return (mFile ? ::fread(pvBuffer, pSize, pCount, mFile) : 0); +} + +// ---------------------------------------------------------------------------------- +size_t DefaultIOStream::Write(const void* pvBuffer, + size_t pSize, + size_t pCount) +{ + ai_assert(NULL != pvBuffer && 0 != pSize && 0 != pCount); + return (mFile ? ::fwrite(pvBuffer, pSize, pCount, mFile) : 0); +} + +// ---------------------------------------------------------------------------------- +aiReturn DefaultIOStream::Seek(size_t pOffset, + aiOrigin pOrigin) +{ + if (!mFile) { + return AI_FAILURE; + } + + // Just to check whether our enum maps one to one with the CRT constants + static_assert(aiOrigin_CUR == SEEK_CUR && + aiOrigin_END == SEEK_END && aiOrigin_SET == SEEK_SET, "aiOrigin_CUR == SEEK_CUR && \ + aiOrigin_END == SEEK_END && aiOrigin_SET == SEEK_SET"); + + // do the seek + return (0 == ::fseek(mFile, (long)pOffset,(int)pOrigin) ? AI_SUCCESS : AI_FAILURE); +} + +// ---------------------------------------------------------------------------------- +size_t DefaultIOStream::Tell() const +{ + if (!mFile) { + return 0; + } + return ::ftell(mFile); +} + +// ---------------------------------------------------------------------------------- +size_t DefaultIOStream::FileSize() const +{ + if (! mFile || mFilename.empty()) { + return 0; + } + + if (SIZE_MAX == mCachedSize ) { + + // Although fseek/ftell would allow us to reuse the existing file handle here, + // it is generally unsafe because: + // - For binary streams, it is not technically well-defined + // - For text files the results are meaningless + // That's why we use the safer variant fstat here. + // + // See here for details: + // https://www.securecoding.cert.org/confluence/display/seccode/FIO19-C.+Do+not+use+fseek()+and+ftell()+to+compute+the+size+of+a+regular+file +#if defined _WIN32 && (!defined __GNUC__ || __MSVCRT_VERSION__ >= 0x0601) + struct __stat64 fileStat; + //using fileno + fstat avoids having to handle the filename + int err = _fstat64( _fileno(mFile), &fileStat ); + if (0 != err) + return 0; + mCachedSize = (size_t) (fileStat.st_size); +#elif defined __GNUC__ || defined __APPLE__ || defined __MACH__ || defined __FreeBSD__ + struct stat fileStat; + int err = stat(mFilename.c_str(), &fileStat ); + if (0 != err) + return 0; + const unsigned long long cachedSize = fileStat.st_size; + mCachedSize = static_cast< size_t >( cachedSize ); +#else +# error "Unknown platform" +#endif + } + return mCachedSize; +} + +// ---------------------------------------------------------------------------------- +void DefaultIOStream::Flush() +{ + if (mFile) { + ::fflush(mFile); + } +} + +// ---------------------------------------------------------------------------------- |