Make cache compression policy a runtime virtual thing

instead of a template policy.

--HG--
extra : convert_revision : 6a4ac7a189a950390a973fdfce94f56190de92db

1 files changed, 71 insertions, 0 deletions

diff --git a/src/base/compression/base.hh b/src/base/compression/base.hh
new file mode 100644
index 000000000..8d1f8d6b5
--- /dev/null
+++ b/src/base/compression/base.hh
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Erik Hallnor
+ *          Nathan Binkert
+ */
+
+#ifndef __BASE_COMPRESSION_BASE_HH__
+#define __BASE_COMPRESSION_BASE_HH__
+
+/**
+ * @file
+ * This file defines a base (abstract virtual) compression algorithm object.
+ */
+
+#include <inttypes.h>
+
+/**
+ * Abstract virtual compression algorithm object.
+ */
+class CompressionAlgorithm
+{
+  public:
+    virtual ~CompressionAlgorithm() {}
+
+    /**
+     * Uncompress the data, causes a fatal since no data should be compressed.
+     * @param dest The output buffer.
+     * @param src  The compressed data.
+     * @param size The number of bytes in src.
+     *
+     * @retval The size of the uncompressed data.
+     */
+    virtual int uncompress(uint8_t * dest, uint8_t *src, int size) = 0;
+
+    /**
+     * Compress the data, just returns the source data.
+     * @param dest The output buffer.
+     * @param src  The data to be compressed.
+     * @param size The number of bytes in src.
+     *
+     * @retval The size of the compressed data.
+     */
+    virtual int compress(uint8_t *dest, uint8_t *src, int size) = 0;
+};
+
+#endif //__BASE_COMPRESSION_BASE_HH__