Implement a "FileSystem" that wraps Android content storage. So far unused.

Core/FileSystems/AndroidStorageFileSystem.h

@@ -0,0 +1,105 @@
+#pragma once
+
+// Like DirectoryFileSystem, but uses the Android Storage Access Framework
+// to access a folder tree as if it was a PSP file system.
+// Unfortunately we cannot implement all the semantics like this, let's see
+// how good we can get it though.
+
+// Copyright (c) 2012- PPSSPP Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official git repository and contact information can be found at
+// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
+
+#pragma once
+
+#include "ppsspp_config.h"
+
+#include <map>
+
+#include "android/jni/AndroidContentURI.h"
+
+#include "Core/FileSystems/FileSystem.h"
+#include "Core/FileSystems/AndroidStorageFileSystem.h"
+
+struct AndroidDirectoryFileHandle {
+	enum Flags {
+		NORMAL,
+		SKIP_REPLAY,
+	};
+
+	int hFile = -1;
+	s64 needsTrunc_ = -1;
+	bool replay_ = true;
+	bool inGameDir_ = false;
+
+	AndroidDirectoryFileHandle(Flags flags) : replay_(flags != SKIP_REPLAY) { }
+
+	// std::string GetLocalPath(const std::string &basePath, std::string localpath);
+	bool Open(const std::string &basePath, std::string &fileName, FileAccess access, u32 &err);
+	size_t Read(u8* pointer, s64 size);
+	size_t Write(const u8* pointer, s64 size);
+	size_t Seek(s32 position, FileMove type);
+	void Close();
+};
+
+class AndroidStorageFileSystem : public IFileSystem {
+public:
+	AndroidStorageFileSystem(IHandleAllocator *_hAlloc, std::string basePath, FileSystemFlags _flags = FileSystemFlags::NONE);
+	~AndroidStorageFileSystem();
+
+	void CloseAll();
+
+	void DoState(PointerWrap &p) override;
+	std::vector<PSPFileInfo> GetDirListing(std::string path) override;
+	int      OpenFile(std::string filename, FileAccess access, const char *devicename = nullptr) override;
+	void     CloseFile(u32 handle) override;
+	size_t   ReadFile(u32 handle, u8 *pointer, s64 size) override;
+	size_t   ReadFile(u32 handle, u8 *pointer, s64 size, int &usec) override;
+	size_t   WriteFile(u32 handle, const u8 *pointer, s64 size) override;
+	size_t   WriteFile(u32 handle, const u8 *pointer, s64 size, int &usec) override;
+	size_t   SeekFile(u32 handle, s32 position, FileMove type) override;
+	PSPFileInfo GetFileInfo(std::string filename) override;
+	bool     OwnsHandle(u32 handle) override;
+	int      Ioctl(u32 handle, u32 cmd, u32 indataPtr, u32 inlen, u32 outdataPtr, u32 outlen, int &usec) override;
+	PSPDevType DevType(u32 handle) override;
+
+	bool MkDir(const std::string &dirname) override;
+	bool RmDir(const std::string &dirname) override;
+	int  RenameFile(const std::string &from, const std::string &to) override;
+	bool RemoveFile(const std::string &filename) override;
+	bool GetHostPath(const std::string &inpath, std::string &outpath) override;
+	FileSystemFlags Flags() override { return flags; }
+	u64 FreeSpace(const std::string &path) override;
+
+private:
+	struct OpenFileEntry {
+		std::string guestFilename;
+		FileAccess access;
+		AndroidDirectoryFileHandle hFile = AndroidDirectoryFileHandle::NORMAL;
+	};
+
+	typedef std::map<u32, OpenFileEntry> EntryMap;
+	EntryMap entries;
+
+	AndroidStorageContentURI baseContentUri;
+
+	std::string basePath;
+	IHandleAllocator *hAlloc;
+	FileSystemFlags flags;
+
+	// Actually, builds a content URI.
+	std::string GetLocalPath(std::string localpath);
+};
+