Implement scanning/skipping of fragments of the trace

[apitrace] / trace_file.hpp

diff --git a/trace_file.hpp b/trace_file.hpp
index e3d797d3b20d3228f06711cfc9b3d31eef86c7a5..13b392cdaa8876729791fb641a2e1f747f2dca8b 100644 (file)
--- a/trace_file.hpp
+++ b/trace_file.hpp
@@ -67,6 +67,7 @@ public:
     void close();
     void flush(void);
     int getc();
+    bool skip(unsigned length);
 
     virtual bool supportsOffsets() const = 0;
     virtual File::Offset currentOffset();
@@ -78,6 +79,7 @@ protected:
     virtual int rawGetc() = 0;
     virtual void rawClose() = 0;
     virtual void rawFlush() = 0;
+    virtual bool rawSkip(unsigned length) = 0;
 
 protected:
     std::string m_filename;
@@ -148,6 +150,14 @@ inline int File::getc()
     return rawGetc();
 }
 
+inline bool File::skip(unsigned length)
+{
+    if (!m_isOpened || m_mode != File::Read) {
+        return false;
+    }
+    return rawSkip(length);
+}
+
 class ZLibFile : public File {
 public:
     ZLibFile(const std::string &filename = std::string(),
@@ -163,10 +173,45 @@ protected:
     virtual int rawGetc();
     virtual void rawClose();
     virtual void rawFlush();
+    virtual bool rawSkip(unsigned length);
 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