moved CompareStreams function from STXTTranslatorTest to this file so that multiple translators tests could use it

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3123 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/add-ons/translators/TranslatorTestAddOn.cpp

@@ -1,11 +1,50 @@
-#include <TestSuite.h>
-#include <TestSuiteAddon.h>
+// TranslatorTestAddOn.cpp
+
+#include <stdio.h>
+#include "TranslatorTestAddOn.h"
 
 // ##### Include headers for your tests here #####
 #include "bmptranslator/BMPTranslatorTest.h"
 #include "stxttranslator/STXTTranslatorTest.h"
 #include "tifftranslator/TIFFTranslatorTest.h"
 
+// helper function used by multiple tests to
+// determine if the given streams are exactly
+// the same
+bool
+CompareStreams(BPositionIO &a, BPositionIO &b)
+{
+	off_t alen = 0, blen = 0;
+	uint8 *abuf = NULL, *bbuf = NULL;
+	
+	a.Seek(0, SEEK_END);
+	alen = a.Position();
+	b.Seek(0, SEEK_END);
+	blen = b.Position();
+	
+	if (alen != blen)
+		return false;
+
+	bool bresult = false;		
+	abuf = new uint8[alen];
+	bbuf = new uint8[blen];
+	if (a.ReadAt(0, abuf, alen) == alen) {
+		if (b.ReadAt(0, bbuf, blen) == blen) {
+			if (memcmp(abuf, bbuf, alen) == 0)
+				bresult = true;
+			else
+				bresult = false;
+		}
+	}
+		
+	delete[] abuf;
+	abuf = NULL;
+	delete[] bbuf;
+	bbuf = NULL;
+	
+	return bresult;
+}
+
 BTestSuite *
 getTestSuite()
 {

src/tests/add-ons/translators/TranslatorTestAddOn.h

@@ -0,0 +1,12 @@
+// TranslatorTestAddOn.h
+
+#ifndef TRANSLATOR_TEST_ADD_ON_H
+#define TRANSLATOR_TEST_ADD_ON_H
+
+#include <TestSuite.h>
+#include <TestSuiteAddon.h>
+#include <DataIO.h>
+
+bool CompareStreams(BPositionIO &a, BPositionIO &b);
+
+#endif // #ifndef TRANSLATOR_TEST_ADD_ON_H