1 files changed, 67 insertions, 0 deletions
diff --git a/xbmc/filesystem/CircularCache.h b/xbmc/filesystem/CircularCache.h
new file mode 100644
index 0000000000..3954eaef86
--- /dev/null
+++ b/xbmc/filesystem/CircularCache.h
@@ -0,0 +1,67 @@
+/*
+ *      Copyright (C) 2005-2014 Team XBMC
+ *      http://xbmc.org
+ *
+ *  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 2, 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 XBMC; see the file COPYING.  If not, see
+ *  <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef CACHECIRCULAR_H
+#define CACHECIRCULAR_H
+
+#include "CacheStrategy.h"
+#include "threads/CriticalSection.h"
+#include "threads/Event.h"
+
+namespace XFILE {
+
+class CCircularCache : public CCacheStrategy
+{
+public:
+    CCircularCache(size_t front, size_t back);
+    virtual ~CCircularCache();
+
+    virtual int Open() ;
+    virtual void Close();
+
+    virtual size_t GetMaxWriteSize(const size_t& iRequestSize) ;
+    virtual int WriteToCache(const char *buf, size_t len) ;
+    virtual int ReadFromCache(char *buf, size_t len) ;
+    virtual int64_t WaitForData(unsigned int minimum, unsigned int iMillis) ;
+
+    virtual int64_t Seek(int64_t pos) ;
+    virtual bool Reset(int64_t pos, bool clearAnyway=true) ;
+
+    virtual int64_t CachedDataEndPosIfSeekTo(int64_t iFilePosition);
+    virtual int64_t CachedDataEndPos(); 
+    virtual bool IsCachedPosition(int64_t iFilePosition);
+
+    virtual CCacheStrategy *CreateNew();
+protected:
+    int64_t           m_beg;       /**< index in file (not buffer) of beginning of valid data */
+    int64_t           m_end;       /**< index in file (not buffer) of end of valid data */
+    int64_t           m_cur;       /**< current reading index in file */
+    uint8_t          *m_buf;       /**< buffer holding data */
+    size_t            m_size;      /**< size of data buffer used (m_buf) */
+    size_t            m_size_back; /**< guaranteed size of back buffer (actual size can be smaller, or larger if front buffer doesn't need it) */
+    CCriticalSection  m_sync;
+    CEvent            m_written;
+#ifdef TARGET_WINDOWS
+    HANDLE            m_handle;
+#endif
+};
+
+} // namespace XFILE
+#endif