Implement jump to.

[apitrace] / trace_snappyfile.hpp

diff --git a/trace_snappyfile.hpp b/trace_snappyfile.hpp
index 7fab8351d42711958644d33be1c30251ae3b6fa6..33159ec73cc81eb4413158de707940a2c64c5211 100644 (file)
--- a/trace_snappyfile.hpp
+++ b/trace_snappyfile.hpp
@@ -27,13 +27,13 @@
 #ifndef TRACE_SNAPPYFILE_HPP
 #define TRACE_SNAPPYFILE_HPP
 
+#include <assert.h>
+
 #include "trace_file.hpp"
 
 #include <string>
 #include <fstream>
 
-#include <stdint.h>
-
 namespace snappy {
     class File;
 }
@@ -52,26 +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();
+    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;
+        }
     }
-    void flushCache();
+    inline bool endOfData() const
+    {
+        return m_stream.eof() && freeCacheSize() == 0;
+    }
+    void flushWriteCache();
+    void flushReadCache(size_t skipLength = 0);
     void createCache(size_t size);
-    void writeCompressedLength(uint32_t  num);
-    uint32_t readCompressedLength();
+    void writeCompressedLength(size_t length);
+    size_t readCompressedLength();
 private:
     std::fstream m_stream;
     char *m_cache;
@@ -79,6 +96,9 @@ private:
     size_t m_cacheSize;
 
     char *m_compressedCache;
+
+    File::Offset m_currentOffset;
+    std::streampos m_endPos;
 };
 
 }