From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Sat, 15 Sep 2012 12:31:14 +0000 (+0100)
Subject: Added tests, and corrected behaviour of LogicDataSnapshot::pow2_ceil
X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=commitdiff_plain;h=8743e7cba1f05ea0dde3dd566f28e6082ed055d0

Added tests, and corrected behaviour of LogicDataSnapshot::pow2_ceil
---

diff --git a/logicdatasnapshot.cpp b/logicdatasnapshot.cpp
index e751b9d..5301abf 100644
--- a/logicdatasnapshot.cpp
+++ b/logicdatasnapshot.cpp
@@ -323,7 +323,8 @@ void LogicDataSnapshot::get_subsampled_edges(
 		get_sample(end) & sig_mask));
 }
 
-int64_t LogicDataSnapshot::pow2_ceil(int64_t x, int power)
+int64_t LogicDataSnapshot::pow2_ceil(int64_t x, unsigned int power)
 {
-	return ((x >> power) + 1) << power;
+	const int64_t p = 1 << power;
+	return ((x < 0) ? x : (x + p - 1)) / p * p;
 }
diff --git a/logicdatasnapshot.h b/logicdatasnapshot.h
index 630aad4..de0f473 100644
--- a/logicdatasnapshot.h
+++ b/logicdatasnapshot.h
@@ -24,6 +24,7 @@
 #include <vector>
 
 namespace LogicDataSnapshotTest {
+	class Pow2;
 	class Basic;
 	class LargeData;
 }
@@ -79,12 +80,13 @@ public:
 
 private:
 
-	static inline int64_t pow2_ceil(int64_t x, int power);
+	static int64_t pow2_ceil(int64_t x, unsigned int power);
 
 private:
 	struct MipMapLevel _mip_map[ScaleStepCount];
 	uint64_t _last_append_sample;
 
+	friend class LogicDataSnapshotTest::Pow2;
 	friend class LogicDataSnapshotTest::Basic;
 	friend class LogicDataSnapshotTest::LargeData;
 };
diff --git a/test/logicdatasnapshot.cpp b/test/logicdatasnapshot.cpp
index 6e1f263..66232cd 100644
--- a/test/logicdatasnapshot.cpp
+++ b/test/logicdatasnapshot.cpp
@@ -18,6 +18,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#define __STDC_LIMIT_MACROS
+#include <stdint.h>
+
 #include <boost/test/unit_test.hpp>
 
 #include "../logicdatasnapshot.h"
@@ -37,6 +40,28 @@ void push_logic(LogicDataSnapshot &s, unsigned int length, uint8_t value)
 	delete[] (uint8_t*)logic.data;
 }
 
+BOOST_AUTO_TEST_CASE(Pow2)
+{
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(-2, 0), -2);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(-1, 0), -1);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(0, 0), 0);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(1, 0), 1);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(2, 0), 2);
+
+	BOOST_CHECK_EQUAL(
+		LogicDataSnapshot::pow2_ceil(INT64_MIN, 0), INT64_MIN);
+	BOOST_CHECK_EQUAL(
+		LogicDataSnapshot::pow2_ceil(INT64_MAX, 0), INT64_MAX);
+
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(-3, 1), -2);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(-2, 1), -2);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(-1, 1), 0);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(0, 1), 0);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(1, 1), 2);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(2, 1), 2);
+	BOOST_CHECK_EQUAL(LogicDataSnapshot::pow2_ceil(3, 1), 4);
+}
+
 BOOST_AUTO_TEST_CASE(Basic)
 {
 	// Create an empty LogicDataSnapshot object