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3c3596dbf2
Since the majority of the code is using ReadAt API already, map this to a `readp` "syscall" which does not mutate any state about the file descriptor therefore making it fairly safe multi-threading wise. This allows to get rid of read-time mutexes in RamCachedFileLoader and therefore fixes #9803
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// Copyright (c) 2012- PPSSPP Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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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 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#include "file/file_util.h"
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#include "Common/FileUtil.h"
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#include "Core/FileLoaders/LocalFileLoader.h"
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LocalFileLoader::LocalFileLoader(const std::string &filename)
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: fd_(0), f_(nullptr), filesize_(0), filename_(filename) {
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// FIXME: perhaps at this point we should just use plain open?
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f_ = File::OpenCFile(filename, "rb");
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fd_ = fileno(f_);
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if (!f_) {
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return;
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}
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#ifdef __ANDROID__
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// Android NDK does not support 64-bit file I/O using C streams
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// so we fall back onto syscalls
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off64_t off = lseek64(fd_, 0, SEEK_END);
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filesize_ = off;
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lseek64(fd_, 0, SEEK_SET);
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#else
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fseek(f_, 0, SEEK_END);
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filesize_ = ftello(f_);
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fseek(f_, 0, SEEK_SET);
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#endif
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}
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LocalFileLoader::~LocalFileLoader() {
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if (f_) {
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fclose(f_);
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}
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}
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bool LocalFileLoader::Exists() {
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// If we couldn't open it for reading, we say it does not exist.
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if (f_ || IsDirectory()) {
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FileInfo info;
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return getFileInfo(filename_.c_str(), &info);
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}
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return false;
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}
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bool LocalFileLoader::IsDirectory() {
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FileInfo info;
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if (getFileInfo(filename_.c_str(), &info)) {
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return info.isDirectory;
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}
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return false;
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}
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s64 LocalFileLoader::FileSize() {
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return filesize_;
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}
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std::string LocalFileLoader::Path() const {
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return filename_;
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}
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size_t LocalFileLoader::ReadAt(s64 absolutePos, size_t bytes, size_t count, void *data, Flags flags) {
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return pread(fd_, data, bytes * count, absolutePos) / bytes;
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}
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