Time scanning of the file and a few frame reads.

[apitrace] / trace_snappyfile.hpp

diff --git a/trace_snappyfile.hpp b/trace_snappyfile.hpp
index 601bc12d0154ebab6a8b13b248adc3c8d6b91775..2ee95bee8e94499e416267297ef774809056cc8d 100644 (file)
--- a/trace_snappyfile.hpp
+++ b/trace_snappyfile.hpp
@@ -1,3 +1,29 @@
+/**************************************************************************
+ *
+ * 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
 
@@ -26,13 +52,16 @@ 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 int rawGetc();
     virtual void rawClose();
-    virtual void rawFlush(FlushType type);
+    virtual void rawFlush();
 
 private:
     inline int freeCacheSize() const
@@ -42,6 +71,10 @@ private:
         else
             return 0;
     }
+    inline bool endOfData() const
+    {
+        return m_stream.eof() && freeCacheSize() == 0;
+    }
     void flushCache();
     void createCache(size_t size);
     void writeCompressedLength(uint32_t  num);
@@ -53,6 +86,8 @@ private:
     size_t m_cacheSize;
 
     char *m_compressedCache;
+
+    File::Offset m_currentOffset;
 };
 
 }