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f8d551803c
fstat is generally faster as is does not cause the IO buffer to be invalidated / refilled. Benchmark results for the startup time of the SCI engine with Gabriel Knight 1 CD: - Linux, glibc, spinning HDD, fseek/ftell: 140 ms - Linux, glibc, spinning HDD, fstat: 100 ms - 3DS, newlib, SD card, fseek/ftell: 68 s - 3DS, newlib, SD card, fstat: 11 s
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "backends/fs/posix/posix-iostream.h"
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#include <sys/stat.h>
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PosixIoStream *PosixIoStream::makeFromPath(const Common::String &path, bool writeMode) {
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FILE *handle = fopen(path.c_str(), writeMode ? "wb" : "rb");
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if (handle)
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return new PosixIoStream(handle);
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return nullptr;
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}
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PosixIoStream::PosixIoStream(void *handle) :
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StdioStream(handle) {
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}
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int32 PosixIoStream::size() const {
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int fd = fileno((FILE *)_handle);
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if (fd == -1) {
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return StdioStream::size();
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}
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// Using fstat to obtain the file size is generally faster than fseek / ftell
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// because it does not affect the IO buffer.
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struct stat st;
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if (fstat(fd, &st) == -1) {
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return StdioStream::size();
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}
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return st.st_size;
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}
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