Diff: CircBuffer.h

Revision:

0:2d90573426d7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CircBuffer.h	Wed Jun 26 20:35:10 2013 +0000
@@ -0,0 +1,82 @@
+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+* and associated documentation files (the "Software"), to deal in the Software without
+* restriction, including without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or
+* substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef CIRCBUFFER_H
+#define CIRCBUFFER_H
+
+template <class T>
+class CircBuffer
+{
+public:
+    CircBuffer( int length )
+    {
+        write = 0;
+        read = 0;
+        size = length + 1;
+        buf = ( T * )malloc( size * sizeof( T ) );
+    };
+
+    bool isFull()
+    {
+        return ( ( write + 1 ) % size == read );
+    };
+
+    bool isEmpty()
+    {
+        return ( read == write );
+    };
+
+    void queue( T k )
+    {
+        if ( isFull() )
+        {
+            read++;
+            read %= size;
+        }
+
+        buf[write++] = k;
+        write %= size;
+    }
+
+    uint16_t available()
+    {
+        return ( write >= read ) ? write - read : size - read + write;
+    };
+
+    bool dequeue( T *c )
+    {
+        bool empty = isEmpty();
+
+        if ( !empty )
+        {
+            *c = buf[read++];
+            read %= size;
+        }
+
+        return( !empty );
+    };
+
+private:
+    volatile uint16_t write;
+    volatile uint16_t read;
+    uint16_t size;
+    T *buf;
+};
+
+#endif
+