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+/* aKode: File abstract-type
+
+ Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+#ifndef _AKODE_FILE_H
+#define _AKODE_FILE_H
+
+extern "C" {
+#include <sys/types.h>
+#include <unistd.h>
+}
+
+namespace aKode {
+
+//! The generic interface to aKode's virtualised files
+
+/*!
+ * An interface with the all the needed file/stream-operations
+ * the library needs.
+ */
+class File {
+public:
+ /*!
+ * Creates a File with the given \a filename.
+ */
+ File(const char* filename) : filename(filename) {};
+ virtual ~File() {};
+ /*!
+ * Opens the file as read-only.
+ * Returns whether the operation was succesfull.
+ */
+ virtual bool openRO() { return false; };
+ /*!
+ * Opens the file as read and write.
+ * Returns whether the operation was succesfull.
+ */
+ virtual bool openRW() { return false; };
+ /*!
+ * Open the file as write-only.
+ * Returns whether the operation was succesfull.
+ */
+ virtual bool openWO() { return false; };
+ /*!
+ * Closes the file.
+ */
+ virtual void close() = 0;
+ /*!
+ * Reads \a num bytes from the file and places the data in \a ptr.
+ * Returns number of read characters. Returns 0 if end-of-file.
+ * Returns negative at errors.
+ */
+ virtual long read(char* ptr, long num) = 0;
+ /*!
+ * Writes \a num bytes from \a ptr to the file.
+ * Returns number of writen characters.
+ * Returns negative at errors.
+ */
+ virtual long write(const char* ptr, long num) = 0;
+ /*!
+ * Seeks to the position.
+ * Behaves semantically as lseek.
+ */
+ virtual bool seek(long to, int whence = SEEK_SET) = 0;
+ /*!
+ * Returns current position in file, or negative if unknown.
+ */
+ virtual long position() const = 0;
+ /*!
+ * Returns length of file, or negative if unknown.
+ */
+ virtual long length() const = 0;
+ /*!
+ * Returns true if the file is seekable
+ */
+ virtual bool seekable() const = 0;
+ /*!
+ * Returns true if the file is readable
+ */
+ virtual bool readable() const = 0;
+ /*!
+ * Returns true if the file is writeable
+ */
+ virtual bool writeable() const = 0;
+ /*!
+ * Returns whether the file has reached end-of-file.
+ */
+ virtual bool eof() const = 0;
+ /*!
+ * Returns true if the file has entered a non-recoverable error-state
+ */
+ virtual bool error() const = 0;
+ /*!
+ * Advises the OS (if possible), that the file will be read
+ * sequentially from the current position and forward.
+ */
+ virtual void fadvise() = 0;
+ /*!
+ * The name of the file.
+ */
+ const char *filename;
+};
+
+} //namespace
+
+#endif