Time scanning of the file and a few frame reads.

[apitrace] / trace_file.hpp

diff --git a/trace_file.hpp b/trace_file.hpp
index a8b33459a024dc44d348f1c6cdd075d2e52a5439..2129d1e388f197b9e2cd7e844ddcf836b3e4cbdc 100644 (file)
--- a/trace_file.hpp
+++ b/trace_file.hpp
@@ -29,6 +29,7 @@
 
 #include <string>
 #include <fstream>
+#include <stdint.h>
 
 namespace Trace {
 
@@ -38,6 +39,15 @@ 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);
@@ -58,6 +68,9 @@ public:
     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;
@@ -130,7 +143,7 @@ inline void File::flush(void)
 inline int File::getc()
 {
     if (!m_isOpened || m_mode != File::Read) {
-        return 0;
+        return -1;
     }
     return rawGetc();
 }
@@ -141,6 +154,8 @@ public:
              File::Mode mode = File::Read);
     virtual ~ZLibFile();
 
+
+    virtual bool supportsOffsets() const;
 protected:
     virtual bool rawOpen(const std::string &filename, File::Mode mode);
     virtual bool rawWrite(const void *buffer, int length);
@@ -152,6 +167,40 @@ private:
     void *m_gzFile;
 };
 
+inline bool
+operator<(const File::Offset &one, const File::Offset &two)
+{
+    return one.chunk < two.chunk ||
+            (one.chunk == two.chunk && one.offsetInChunk < two.offsetInChunk);
+}
+
+inline bool
+operator==(const File::Offset &one, const File::Offset &two)
+{
+    return one.chunk == two.chunk &&
+            one.offsetInChunk == two.offsetInChunk;
+}
+
+inline bool
+operator>=(const File::Offset &one, const File::Offset &two)
+{
+    return one.chunk > two.chunk ||
+            (one.chunk == two.chunk && one.offsetInChunk >= two.offsetInChunk);
+}
+
+inline bool
+operator>(const File::Offset &one, const File::Offset &two)
+{
+    return two < one;
+}
+
+inline bool
+operator<=(const File::Offset &one, const File::Offset &two)
+{
+    return two >= one;
+}
+
+
 }
 
 #endif