Merge branch 'master' into on-demand-loading

[apitrace] / trace_file.hpp

diff --git a/trace_file.hpp b/trace_file.hpp
index 7e7f9bd09bf5ff3ac473952796aaf9e20c884cc0..e3d797d3b20d3228f06711cfc9b3d31eef86c7a5 100644 (file)
--- a/trace_file.hpp
+++ b/trace_file.hpp
@@ -1,8 +1,35 @@
+/**************************************************************************
+ *
+ * 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_FILE_HPP
 #define TRACE_FILE_HPP
 
 #include <string>
 #include <fstream>
+#include <stdint.h>
 
 namespace Trace {
 
@@ -12,6 +39,18 @@ public:
         Read,
         Write
     };
+    struct Offset {
+        Offset()
+            : chunk(0),
+              offsetInChunk(0)
+        {}
+        uint64_t chunk;
+        uint32_t offsetInChunk;
+    };
+
+public:
+    static bool isZLibCompressed(const std::string &filename);
+    static bool isSnappyCompressed(const std::string &filename);
 public:
     File(const std::string &filename = std::string(),
          File::Mode mode = File::Read);
@@ -19,15 +58,19 @@ public:
 
     bool isOpened() const;
     File::Mode mode() const;
+
     std::string filename() const;
 
     bool open(const std::string &filename, File::Mode mode);
     bool write(const void *buffer, int length);
     bool read(void *buffer, int length);
     void close();
-    void flush();
+    void flush(void);
     int getc();
 
+    virtual bool supportsOffsets() const = 0;
+    virtual File::Offset currentOffset();
+    virtual void setCurrentOffset(const File::Offset &offset);
 protected:
     virtual bool rawOpen(const std::string &filename, File::Mode mode) = 0;
     virtual bool rawWrite(const void *buffer, int length) = 0;
@@ -42,34 +85,77 @@ protected:
     bool m_isOpened;
 };
 
+inline bool File::isOpened() const
+{
+    return m_isOpened;
+}
+
+inline File::Mode File::mode() const
+{
+    return m_mode;
+}
+
+inline std::string File::filename() const
+{
+    return m_filename;
+}
+
+inline bool File::open(const std::string &filename, File::Mode mode)
+{
+    if (m_isOpened) {
+        close();
+    }
+    m_isOpened = rawOpen(filename, mode);
+    m_mode = mode;
+
+    return m_isOpened;
+}
+
+inline bool File::write(const void *buffer, int length)
+{
+    if (!m_isOpened || m_mode != File::Write) {
+        return false;
+    }
+    return rawWrite(buffer, length);
+}
+
+inline bool File::read(void *buffer, int length)
+{
+    if (!m_isOpened || m_mode != File::Read) {
+        return false;
+    }
+    return rawRead(buffer, length);
+}
+
+inline void File::close()
+{
+    if (m_isOpened) {
+        rawClose();
+        m_isOpened = false;
+    }
+}
+
+inline void File::flush(void)
+{
+    rawFlush();
+}
+
+inline int File::getc()
+{
+    if (!m_isOpened || m_mode != File::Read) {
+        return -1;
+    }
+    return rawGetc();
+}
+
 class ZLibFile : public File {
 public:
     ZLibFile(const std::string &filename = std::string(),
              File::Mode mode = File::Read);
     virtual ~ZLibFile();
 
-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();
-private:
-    void *m_gzFile;
-};
-
-namespace snappy {
-    class File;
-}
-
-#define SNAPPY_CHUNK_SIZE (1 * 1024 * 1024)
-class SnappyFile : public File {
-public:
-    SnappyFile(const std::string &filename = std::string(),
-               File::Mode mode = File::Read);
-    virtual ~SnappyFile();
 
+    virtual bool supportsOffsets() const;
 protected:
     virtual bool rawOpen(const std::string &filename, File::Mode mode);
     virtual bool rawWrite(const void *buffer, int length);
@@ -77,27 +163,10 @@ protected:
     virtual int rawGetc();
     virtual void rawClose();
     virtual void rawFlush();
-
-private:
-    inline int freeCacheSize() const
-    {
-        if (m_cacheSize > 0)
-            return m_cacheSize - (m_cachePtr - m_cache);
-        else
-            return 0;
-    }
-    void flushCache();
-    void createCache(size_t size);
 private:
-    std::fstream m_stream;
-    char *m_cache;
-    char *m_cachePtr;
-    size_t m_cacheSize;
-
-    char *m_compressedCache;
+    void *m_gzFile;
 };
 
-
 }
 
 #endif