reference: StreamGetSzPtr

git-svn-id: svn://ultimatepp.org/upp/trunk@8301 f0d560ea-af0d-0410-9eb7-867de7ffcac7

reference/StreamGetSzPtr/StreamGetSzPtr.cpp

@@ -0,0 +1,61 @@
+#include <Core/Core.h>
+
+using namespace Upp;
+
+int CountLines(Stream& s)
+{
+	int n = 0;
+	int c;
+	while((c = s.Get()) >= 0)
+		n += c == '\n';
+	return n;
+}
+
+int CountLinesOptimized(Stream& s)
+{
+	int n = 0;
+	for(;;) {
+		int sz;
+		const byte *p = s.GetSzPtr(sz);
+		if(sz) {
+			const byte *e = p + sz;
+			const byte *e4 = p + (sz & ~3);
+			while(p < e4) {
+				n += (p[0] == '\n' || p[1] == '\n' || p[2] == '\n' || p[3] == '\n');
+				p += 4;
+			}
+			while(p < e)
+				n += *p++ == '\n';
+		}
+		else {
+			int c = s.Get();
+			if(c < 0)
+				return n;
+			n += c == '\n';
+		}
+	}
+	return n;
+}
+
+CONSOLE_APP_MAIN
+{
+	StdLogSetup(LOG_FILE|LOG_COUT);
+	
+	const Vector<String>& arg = CommandLine();
+	if(arg.GetCount() == 0) {
+		RLOG("Please provide testing file path as argument, preferably >500MB");
+		return;
+	}
+	
+	{
+		RTIMESTOP("Simple");
+		FileIn in(arg[0]);
+		RDUMP(CountLines(in));
+	}
+
+	{
+		RTIMESTOP("Optimized");
+		FileIn in(arg[0]);
+		RDUMP(CountLinesOptimized(in));
+	}
+}