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backends/fs/psp/psp-stream.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PSPSTREAM_H_
+#define PSPSTREAM_H_
+
+#include <pspkerneltypes.h>
+#include "backends/platform/psp/powerman.h"
+//#include "common/list.h"
+#include "common/noncopyable.h"
+#include "common/stream.h"
+#include "common/str.h"
+
+/**
+ *  Class to handle special suspend/resume needs of PSP IO Streams
+ */
+class PspIoStream final : public Common::SeekableReadStream, public Common::SeekableWriteStream, public Common::NonCopyable, public Suspendable {
+protected:
+	SceUID _handle;		// file handle
+	Common::String _path;
+	int _fileSize;
+	bool _writeMode;	// for resuming in the right mode
+	int _physicalPos;	// physical position in file
+	int _pos;			// position. Sometimes virtual
+	bool _eos;			// EOS flag
+
+	enum {
+		SuspendError = 2,
+		ResumeError = 3
+	};
+
+	// debug stuff
+	mutable int _error;		// file error state
+	int _errorSuspend;			// for debugging
+	mutable int _errorSource;
+	int _errorPos;
+	SceUID _errorHandle;
+	int _suspendCount;
+
+	bool physicalSeekFromCur(int32 offset);
+
+public:
+
+	/**
+	 * Given a path, invoke fopen on that path and wrap the result in a
+	 * PspIoStream instance.
+	 */
+	static PspIoStream *makeFromPath(const Common::String &path, bool writeMode);
+
+	PspIoStream(const Common::String &path, bool writeMode);
+	~PspIoStream() override;
+
+	SceUID open();		// open the file pointed to by the file path
+
+	bool err() const override;
+	void clearErr() override;
+	bool eos() const override;
+
+	uint32 write(const void *dataPtr, uint32 dataSize) override;
+	bool flush() override;
+
+	int64 pos() const override;
+	int64 size() const override;
+	bool seek(int64 offs, int whence = SEEK_SET) override;
+	uint32 read(void *dataPtr, uint32 dataSize) override;
+
+	// for suspending
+	int suspend() override;		/* Suspendable interface (power manager) */
+	int resume() override;		/* " " */
+};
+
+#endif /* PSPSTREAM_H_ */