1 files changed, 55 insertions, 0 deletions
diff --git a/xbmc/filesystem/CircularCache.h b/xbmc/filesystem/CircularCache.h
new file mode 100644
index 0000000..21d3e6b
--- /dev/null
+++ b/xbmc/filesystem/CircularCache.h
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#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);
+    ~CCircularCache() override;
+
+    int Open() override;
+    void Close() override;
+
+    size_t GetMaxWriteSize(const size_t& iRequestSize) override;
+    int WriteToCache(const char *buf, size_t len) override;
+    int ReadFromCache(char *buf, size_t len) override;
+    int64_t WaitForData(uint32_t minimum, std::chrono::milliseconds timeout) override;
+
+    int64_t Seek(int64_t pos) override;
+    bool Reset(int64_t pos) override;
+
+    int64_t CachedDataEndPosIfSeekTo(int64_t iFilePosition) override;
+    int64_t CachedDataStartPos() override;
+    int64_t CachedDataEndPos() override;
+    bool IsCachedPosition(int64_t iFilePosition) override;
+
+    CCacheStrategy *CreateNew() override;
+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
+