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https://github.com/libretro/ppsspp.git
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435 lines
10 KiB
C++
435 lines
10 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 <set>
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#include "Common/StringUtil.h"
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#include "../HLE/sceKernelThread.h"
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#include "MetaFileSystem.h"
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static bool ApplyPathStringToComponentsVector(std::vector<std::string> &vector, const std::string &pathString)
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{
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size_t len = pathString.length();
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size_t start = 0;
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while (start < len)
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{
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size_t i = pathString.find('/', start);
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if (i == std::string::npos)
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i = len;
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if (i > start)
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{
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std::string component = pathString.substr(start, i - start);
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if (component != ".")
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{
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if (component == "..")
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{
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if (vector.size() != 0)
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{
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vector.pop_back();
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}
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else
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{
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// The PSP silently ignores attempts to .. to parent of root directory
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WARN_LOG(HLE, "RealPath: ignoring .. beyond root - root directory is its own parent: \"%s\"", pathString.c_str());
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}
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}
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else
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{
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vector.push_back(component);
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}
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}
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}
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start = i + 1;
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}
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return true;
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}
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/*
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* Changes relative paths to absolute, removes ".", "..", and trailing "/"
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* "drive:./blah" is absolute (ignore the dot) and "/blah" is relative (because it's missing "drive:")
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* babel (and possibly other games) use "/directoryThatDoesNotExist/../directoryThatExists/filename"
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*/
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static bool RealPath(const std::string ¤tDirectory, const std::string &inPath, std::string &outPath)
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{
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size_t inLen = inPath.length();
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if (inLen == 0)
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{
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WARN_LOG(HLE, "RealPath: inPath is empty");
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outPath = currentDirectory;
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return true;
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}
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size_t inColon = inPath.find(':');
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if (inColon + 1 == inLen)
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{
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WARN_LOG(HLE, "RealPath: inPath is all prefix and no path: \"%s\"", inPath.c_str());
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outPath = inPath;
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return true;
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}
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bool relative = (inColon == std::string::npos);
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std::string prefix, inAfterColon;
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std::vector<std::string> cmpnts; // path components
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size_t outPathCapacityGuess = inPath.length();
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if (relative)
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{
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size_t curDirLen = currentDirectory.length();
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if (curDirLen == 0)
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{
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ERROR_LOG(HLE, "RealPath: inPath \"%s\" is relative, but current directory is empty", inPath.c_str());
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return false;
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}
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size_t curDirColon = currentDirectory.find(':');
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if (curDirColon == std::string::npos)
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{
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ERROR_LOG(HLE, "RealPath: inPath \"%s\" is relative, but current directory \"%s\" has no prefix", inPath.c_str(), currentDirectory.c_str());
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return false;
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}
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if (curDirColon + 1 == curDirLen)
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{
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ERROR_LOG(HLE, "RealPath: inPath \"%s\" is relative, but current directory \"%s\" is all prefix and no path. Using \"/\" as path for current directory.", inPath.c_str(), currentDirectory.c_str());
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}
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else
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{
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const std::string curDirAfter = currentDirectory.substr(curDirColon + 1);
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if (! ApplyPathStringToComponentsVector(cmpnts, curDirAfter) )
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{
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ERROR_LOG(HLE,"RealPath: currentDirectory is not a valid path: \"%s\"", currentDirectory.c_str());
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return false;
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}
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outPathCapacityGuess += curDirLen;
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}
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prefix = currentDirectory.substr(0, curDirColon + 1);
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inAfterColon = inPath;
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}
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else
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{
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prefix = inPath.substr(0, inColon + 1);
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inAfterColon = inPath.substr(inColon + 1);
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}
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if (! ApplyPathStringToComponentsVector(cmpnts, inAfterColon) )
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{
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WARN_LOG(HLE, "RealPath: inPath is not a valid path: \"%s\"", inPath.c_str());
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return false;
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}
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outPath.clear();
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outPath.reserve(outPathCapacityGuess);
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outPath.append(prefix);
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size_t numCmpnts = cmpnts.size();
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for (size_t i = 0; i < numCmpnts; i++)
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{
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outPath.append(1, '/');
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outPath.append(cmpnts[i]);
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}
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return true;
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}
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IFileSystem *MetaFileSystem::GetHandleOwner(u32 handle)
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{
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for (size_t i = 0; i < fileSystems.size(); i++)
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{
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if (fileSystems[i].system->OwnsHandle(handle))
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return fileSystems[i].system; //got it!
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}
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//none found?
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return 0;
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}
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bool MetaFileSystem::MapFilePath(const std::string &_inpath, std::string &outpath, MountPoint **system)
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{
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std::string realpath;
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// Special handling: host0:command.txt (as seen in Super Monkey Ball Adventures, for example)
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// appears to mean the current directory on the UMD. Let's just assume the current directory.
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std::string inpath = _inpath;
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if (strncasecmp(inpath.c_str(), "host0:", 5) == 0) {
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INFO_LOG(HLE, "Host0 path detected, stripping: %s", inpath.c_str());
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inpath = inpath.substr(6);
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}
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const std::string *currentDirectory = &startingDirectory;
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int currentThread = __KernelGetCurThread();
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currentDir_t::iterator it = currentDir.find(currentThread);
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if (it == currentDir.end())
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{
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//TODO: emulate PSP's error 8002032C: "no current working directory" if relative... may break things requiring fixes elsewhere
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if (inpath.find(':') == std::string::npos /* means path is relative */)
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WARN_LOG(HLE, "Path is relative, but current directory not set for thread %i. Should give error, instead falling back to %s", currentThread, startingDirectory.c_str());
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}
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else
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{
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currentDirectory = &(it->second);
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}
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if ( RealPath(*currentDirectory, inpath, realpath) )
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{
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for (size_t i = 0; i < fileSystems.size(); i++)
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{
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size_t prefLen = fileSystems[i].prefix.size();
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if (strncasecmp(fileSystems[i].prefix.c_str(), realpath.c_str(), prefLen) == 0)
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{
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outpath = realpath.substr(prefLen);
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*system = &(fileSystems[i]);
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DEBUG_LOG(HLE, "MapFilePath: mapped \"%s\" to prefix: \"%s\", path: \"%s\"", inpath.c_str(), fileSystems[i].prefix.c_str(), outpath.c_str());
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return true;
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}
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}
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}
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DEBUG_LOG(HLE, "MapFilePath: failed mapping \"%s\", returning false", inpath.c_str());
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return false;
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}
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void MetaFileSystem::Mount(std::string prefix, IFileSystem *system)
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{
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MountPoint x;
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x.prefix=prefix;
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x.system=system;
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fileSystems.push_back(x);
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}
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void MetaFileSystem::Shutdown()
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{
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current = 6;
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// Ownership is a bit convoluted. Let's just delete everything once.
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std::set<IFileSystem *> toDelete;
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for (size_t i = 0; i < fileSystems.size(); i++) {
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toDelete.insert(fileSystems[i].system);
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}
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for (auto iter = toDelete.begin(); iter != toDelete.end(); ++iter)
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{
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delete *iter;
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}
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fileSystems.clear();
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currentDir.clear();
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startingDirectory = "";
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}
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u32 MetaFileSystem::OpenFile(std::string filename, FileAccess access)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(filename, of, &system))
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{
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return system->OpenFile(of, access);
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}
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else
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{
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return 0;
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}
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}
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PSPFileInfo MetaFileSystem::GetFileInfo(std::string filename)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(filename, of, &system))
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{
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return system->GetFileInfo(of);
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}
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else
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{
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PSPFileInfo bogus; // TODO
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return bogus;
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}
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}
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bool MetaFileSystem::GetHostPath(const std::string &inpath, std::string &outpath)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(inpath, of, &system)) {
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return system->GetHostPath(of, outpath);
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} else {
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return false;
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}
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}
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std::vector<PSPFileInfo> MetaFileSystem::GetDirListing(std::string path)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(path, of, &system))
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{
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return system->GetDirListing(of);
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}
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else
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{
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std::vector<PSPFileInfo> empty;
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return empty;
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}
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}
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void MetaFileSystem::ThreadEnded(int threadID)
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{
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currentDir.erase(threadID);
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}
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void MetaFileSystem::ChDir(const std::string &dir)
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{
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int curThread = __KernelGetCurThread();
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std::string of;
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MountPoint *mountPoint;
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if (MapFilePath(dir, of, &mountPoint))
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{
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currentDir[curThread] = mountPoint->prefix + of;
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//return true;
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}
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else
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{
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//TODO: PSP's sceIoChdir seems very forgiving, but does it always accept bad paths and what happens when it does?
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WARN_LOG(HLE, "ChDir failed to map path \"%s\", saving as current directory anyway", dir.c_str());
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currentDir[curThread] = dir;
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//return false;
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}
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}
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bool MetaFileSystem::MkDir(const std::string &dirname)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(dirname, of, &system))
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{
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return system->MkDir(of);
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}
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else
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{
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return false;
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}
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}
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bool MetaFileSystem::RmDir(const std::string &dirname)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(dirname, of, &system))
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{
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return system->RmDir(of);
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}
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else
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{
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return false;
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}
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}
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bool MetaFileSystem::RenameFile(const std::string &from, const std::string &to)
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{
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std::string of;
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std::string rf;
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IFileSystem *system;
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if (MapFilePath(from, of, &system) && MapFilePath(to, rf, &system))
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{
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return system->RenameFile(of, rf);
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}
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else
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{
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return false;
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}
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}
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bool MetaFileSystem::DeleteFile(const std::string &filename)
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{
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std::string of;
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IFileSystem *system;
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if (MapFilePath(filename, of, &system))
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{
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return system->DeleteFile(of);
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}
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else
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{
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return false;
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}
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}
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void MetaFileSystem::CloseFile(u32 handle)
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{
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IFileSystem *sys = GetHandleOwner(handle);
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if (sys)
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sys->CloseFile(handle);
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}
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size_t MetaFileSystem::ReadFile(u32 handle, u8 *pointer, s64 size)
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{
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IFileSystem *sys = GetHandleOwner(handle);
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if (sys)
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return sys->ReadFile(handle,pointer,size);
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else
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return 0;
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}
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size_t MetaFileSystem::WriteFile(u32 handle, const u8 *pointer, s64 size)
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{
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IFileSystem *sys = GetHandleOwner(handle);
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if (sys)
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return sys->WriteFile(handle,pointer,size);
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else
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return 0;
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}
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size_t MetaFileSystem::SeekFile(u32 handle, s32 position, FileMove type)
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{
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IFileSystem *sys = GetHandleOwner(handle);
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if (sys)
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return sys->SeekFile(handle,position,type);
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else
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return 0;
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}
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void MetaFileSystem::DoState(PointerWrap &p)
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{
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p.Do(current);
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// Save/load per-thread current directory map
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p.Do(currentDir);
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int n = (u32) fileSystems.size();
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p.Do(n);
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if (n != fileSystems.size())
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{
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ERROR_LOG(FILESYS, "Savestate failure: number of filesystems doesn't match.");
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return;
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}
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for (u32 i = 0; i < n; ++i)
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fileSystems[i].system->DoState(p);
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p.DoMarker("MetaFileSystem");
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}
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