Add utility for trace version identification.

extra/identify.cpp

@@ -0,0 +1,50 @@
+// g++ identify.cpp -lpthread ../common/tracy_lz4.cpp ../zstd/common/*.c ../zstd/decompress/*.c
+
+#include <memory>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "../server/TracyFileRead.hpp"
+#include "../server/TracyVersion.hpp"
+
+static const uint8_t FileHeader[8] { 't', 'r', 'a', 'c', 'y', tracy::Version::Major, tracy::Version::Minor, tracy::Version::Patch };
+enum { FileHeaderMagic = 5 };
+
+int main( int argc, char** argv )
+{
+    if( argc != 2 )
+    {
+        fprintf( stderr, "Usage: %s trace\n", argv[0] );
+        return -1;
+    }
+
+    try
+    {
+        std::unique_ptr<tracy::FileRead> f( tracy::FileRead::Open( argv[1] ) );
+        if( !f )
+        {
+            fprintf( stderr, "%s: Cannot open!\n", argv[1] );
+            return -2;
+        }
+
+        uint8_t hdr[8];
+        f->Read( hdr, sizeof( hdr ) );
+        if( memcmp( FileHeader, hdr, FileHeaderMagic ) != 0 )
+        {
+            fprintf( stderr, "%s: Bad header!\n", argv[1] );
+            return -3;
+        }
+
+        printf( "%s: %i.%i.%i\n", argv[1], hdr[FileHeaderMagic], hdr[FileHeaderMagic+1], hdr[FileHeaderMagic+2] );
+    }
+    catch( const tracy::NotTracyDump& )
+    {
+        fprintf( stderr, "%s: Not a tracy dump!\n", argv[1] );
+        return -4;
+    }
+    catch( const tracy::FileReadError& )
+    {
+        fprintf( stderr, "%s: File read error!\n", argv[1] );
+        return -5;
+    }
+}