X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=trace_snappyfile.hpp;h=33159ec73cc81eb4413158de707940a2c64c5211;hb=9d50fbb84f9b3086aa8e985e32534961336563b2;hp=5489069b0506eadf700b99e69e3ff2abf3d3e890;hpb=b5f2ee344ef2914ca141608107c571ec0c28c6a6;p=apitrace

diff --git a/trace_snappyfile.hpp b/trace_snappyfile.hpp
index 5489069..33159ec 100644
--- a/trace_snappyfile.hpp
+++ b/trace_snappyfile.hpp
@@ -1,6 +1,34 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Zack Rusin
+ * All Rights Reserved.
+ *
+ * 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 TRACE_SNAPPYFILE_HPP
 #define TRACE_SNAPPYFILE_HPP
 
+#include <assert.h>
+
 #include "trace_file.hpp"
 
 #include <string>
@@ -24,24 +52,43 @@ public:
                File::Mode mode = File::Read);
     virtual ~SnappyFile();
 
+    virtual bool supportsOffsets() const;
+    virtual File::Offset currentOffset();
+    virtual void setCurrentOffset(const File::Offset &offset);
 protected:
     virtual bool rawOpen(const std::string &filename, File::Mode mode);
-    virtual bool rawWrite(const void *buffer, int length);
-    virtual bool rawRead(void *buffer, int length);
+    virtual bool rawWrite(const void *buffer, size_t length);
+    virtual bool rawRead(void *buffer, size_t length);
     virtual int rawGetc();
     virtual void rawClose();
-    virtual void rawFlush(FlushType type);
+    virtual void rawFlush();
+    virtual bool rawSkip(size_t length);
+    virtual int rawPercentRead();
 
 private:
-    inline int freeCacheSize() const
+    inline size_t usedCacheSize() const
+    {
+        assert(m_cachePtr >= m_cache);
+        return m_cachePtr - m_cache;
+    }
+    inline size_t freeCacheSize() const
     {
-        if (m_cacheSize > 0)
-            return m_cacheSize - (m_cachePtr - m_cache);
-        else
+        assert(m_cacheSize >= usedCacheSize());
+        if (m_cacheSize > 0) {
+            return m_cacheSize - usedCacheSize();
+        } else {
             return 0;
+        }
+    }
+    inline bool endOfData() const
+    {
+        return m_stream.eof() && freeCacheSize() == 0;
     }
-    void flushCache();
+    void flushWriteCache();
+    void flushReadCache(size_t skipLength = 0);
     void createCache(size_t size);
+    void writeCompressedLength(size_t length);
+    size_t readCompressedLength();
 private:
     std::fstream m_stream;
     char *m_cache;
@@ -49,6 +96,9 @@ private:
     size_t m_cacheSize;
 
     char *m_compressedCache;
+
+    File::Offset m_currentOffset;
+    std::streampos m_endPos;
 };
 
 }