Index: gtest/gtest.xcodeproj/project.pbxproj
===================================================================
--- gtest/gtest.xcodeproj/project.pbxproj
+++ gtest/gtest.xcodeproj/project.pbxproj
@@ -10,12 +10,15 @@
 		236ED33319D49076008CA7D7 /* ThreadStateCoordinatorTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ThreadStateCoordinatorTest.cpp; sourceTree = "<group>"; };
 		236ED33419D49081008CA7D7 /* Makefile */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.make; path = Makefile; sourceTree = "<group>"; };
 		236ED33619D490B0008CA7D7 /* Makefile.rules */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = Makefile.rules; sourceTree = "<group>"; };
+		338C47F41A1E67B900B46077 /* Makefile */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.make; name = Makefile; path = Utility/Makefile; sourceTree = "<group>"; };
+		338C47F51A1E67B900B46077 /* StringExtractorTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = StringExtractorTest.cpp; path = Utility/StringExtractorTest.cpp; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXGroup section */
 		236ED32F19D4901D008CA7D7 /* unittest */ = {
 			isa = PBXGroup;
 			children = (
+				338C47F31A1E677900B46077 /* Utility */,
 				236ED33019D4903E008CA7D7 /* Plugins */,
 			);
 			path = unittest;
@@ -62,6 +65,15 @@
 			);
 			sourceTree = "<group>";
 		};
+		338C47F31A1E677900B46077 /* Utility */ = {
+			isa = PBXGroup;
+			children = (
+				338C47F41A1E67B900B46077 /* Makefile */,
+				338C47F51A1E67B900B46077 /* StringExtractorTest.cpp */,
+			);
+			name = Utility;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXLegacyTarget section */
Index: gtest/unittest/Utility/Makefile
===================================================================
--- /dev/null
+++ gtest/unittest/Utility/Makefile
@@ -0,0 +1,17 @@
+THIS_FILE_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))/
+
+LEVEL := $(realpath $(THIS_FILE_DIR)../../make)
+
+CFLAGS_EXTRAS := -D__STDC_LIMIT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS
+ENABLE_THREADS := YES
+CXX_SOURCES := $(wildcard *.cpp) \
+	$(realpath $(LEVEL)/../../source/Utility/StringExtractor.cpp)
+MAKE_DSYM := NO
+
+OS := $(shell uname -s)
+# $(info OS $(OS))
+ifeq ($(OS),Linux)
+    LD_EXTRAS := -lncurses -ldl
+endif
+
+include $(LEVEL)/Makefile.rules
Index: gtest/unittest/Utility/StringExtractorTest.cpp
===================================================================
--- /dev/null
+++ gtest/unittest/Utility/StringExtractorTest.cpp
@@ -0,0 +1,267 @@
+#include <limits.h>
+#include "gtest/gtest.h"
+
+#include "Utility/StringExtractor.h"
+
+namespace
+{
+    class StringExtractorTest: public ::testing::Test
+    {
+    };
+}
+
+TEST_F (StringExtractorTest, InitEmpty)
+{
+    const char kEmptyString[] = "";
+    StringExtractor ex (kEmptyString);
+
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (0, ex.GetFilePos());
+    ASSERT_STREQ (kEmptyString, ex.GetStringRef().c_str());
+    ASSERT_EQ (true, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, InitMisc)
+{
+    const char kInitMiscString[] = "Hello, StringExtractor!";
+    StringExtractor ex (kInitMiscString);
+
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (0, ex.GetFilePos());
+    ASSERT_STREQ (kInitMiscString, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (sizeof(kInitMiscString)-1, ex.GetBytesLeft());
+    ASSERT_EQ (kInitMiscString[0], *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Underflow)
+{
+    const char kEmptyString[] = "";
+    StringExtractor ex (kEmptyString);
+
+    ASSERT_EQ (0xab, ex.GetHexU8(0xab));
+    ASSERT_EQ (false, ex.IsGood());
+    ASSERT_EQ (UINT64_MAX, ex.GetFilePos());
+    ASSERT_STREQ (kEmptyString, ex.GetStringRef().c_str());
+    ASSERT_EQ (true, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Underflow2)
+{
+    const char kOneNibble[] = "1";
+    StringExtractor ex (kOneNibble);
+
+    ASSERT_EQ (0xbc, ex.GetHexU8(0xbc));
+    ASSERT_EQ (false, ex.IsGood());
+    ASSERT_EQ (UINT64_MAX, ex.GetFilePos());
+    ASSERT_STREQ (kOneNibble, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_InvalidHex)
+{
+    const char kInvalidHex[] = "xx";
+    StringExtractor ex (kInvalidHex);
+
+    ASSERT_EQ (0xcd, ex.GetHexU8(0xcd));
+    ASSERT_EQ (false, ex.IsGood());
+    ASSERT_EQ (UINT64_MAX, ex.GetFilePos());
+    ASSERT_STREQ (kInvalidHex, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Exact)
+{
+    const char kValidHexPair[] = "12";
+    StringExtractor ex (kValidHexPair);
+
+    ASSERT_EQ (0x12, ex.GetHexU8(0x12));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (2, ex.GetFilePos());
+    ASSERT_STREQ (kValidHexPair, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Extra)
+{
+    const char kValidHexPair[] = "1234";
+    StringExtractor ex (kValidHexPair);
+
+    ASSERT_EQ (0x12, ex.GetHexU8(0x12));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (2, ex.GetFilePos());
+    ASSERT_STREQ (kValidHexPair, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (2, ex.GetBytesLeft());
+    ASSERT_EQ ('3', *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Underflow_NoEof)
+{
+    const char kEmptyString[] = "";
+    StringExtractor ex (kEmptyString);
+    const bool kSetEofOnFail = false;
+
+    ASSERT_EQ (0xab, ex.GetHexU8(0xab, kSetEofOnFail));
+    ASSERT_EQ (false, ex.IsGood()); // this result seems inconsistent with kSetEofOnFail == false
+    ASSERT_EQ (UINT64_MAX, ex.GetFilePos());
+    ASSERT_STREQ (kEmptyString, ex.GetStringRef().c_str());
+    ASSERT_EQ (true, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Underflow2_NoEof)
+{
+    const char kOneNibble[] = "1";
+    StringExtractor ex (kOneNibble);
+    const bool kSetEofOnFail = false;
+
+    ASSERT_EQ (0xbc, ex.GetHexU8(0xbc, kSetEofOnFail));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (0, ex.GetFilePos());
+    ASSERT_STREQ (kOneNibble, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (1, ex.GetBytesLeft());
+    ASSERT_EQ ('1', *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_InvalidHex_NoEof)
+{
+    const char kInvalidHex[] = "xx";
+    StringExtractor ex (kInvalidHex);
+    const bool kSetEofOnFail = false;
+
+    ASSERT_EQ (0xcd, ex.GetHexU8(0xcd, kSetEofOnFail));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (0, ex.GetFilePos());
+    ASSERT_STREQ (kInvalidHex, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (2, ex.GetBytesLeft());
+    ASSERT_EQ ('x', *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Exact_NoEof)
+{
+    const char kValidHexPair[] = "12";
+    StringExtractor ex (kValidHexPair);
+    const bool kSetEofOnFail = false;
+
+    ASSERT_EQ (0x12, ex.GetHexU8(0x12, kSetEofOnFail));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (2, ex.GetFilePos());
+    ASSERT_STREQ (kValidHexPair, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (0, ex.GetBytesLeft());
+    ASSERT_EQ (nullptr, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexU8_Extra_NoEof)
+{
+    const char kValidHexPair[] = "1234";
+    StringExtractor ex (kValidHexPair);
+    const bool kSetEofOnFail = false;
+
+    ASSERT_EQ (0x12, ex.GetHexU8(0x12, kSetEofOnFail));
+    ASSERT_EQ (true, ex.IsGood());
+    ASSERT_EQ (2, ex.GetFilePos());
+    ASSERT_STREQ (kValidHexPair, ex.GetStringRef().c_str());
+    ASSERT_EQ (false, ex.Empty());
+    ASSERT_EQ (2, ex.GetBytesLeft());
+    ASSERT_EQ ('3', *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexBytes)
+{
+    const char kHexEncodedBytes[] = "abcdef0123456789xyzw";
+    const size_t kValidHexPairs = 8;
+    StringExtractor ex(kHexEncodedBytes);
+
+    uint8_t dst[kValidHexPairs];
+    ASSERT_EQ(kValidHexPairs, ex.GetHexBytes (dst, kValidHexPairs, 0xde));
+    EXPECT_EQ(0xab,dst[0]);
+    EXPECT_EQ(0xcd,dst[1]);
+    EXPECT_EQ(0xef,dst[2]);
+    EXPECT_EQ(0x01,dst[3]);
+    EXPECT_EQ(0x23,dst[4]);
+    EXPECT_EQ(0x45,dst[5]);
+    EXPECT_EQ(0x67,dst[6]);
+    EXPECT_EQ(0x89,dst[7]);
+
+    ASSERT_EQ(true, ex.IsGood());
+    ASSERT_EQ(2*kValidHexPairs, ex.GetFilePos());
+    ASSERT_EQ(false, ex.Empty());
+    ASSERT_EQ(4, ex.GetBytesLeft());
+    ASSERT_EQ('x', *ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexBytes_Underflow)
+{
+    const char kHexEncodedBytes[] = "abcdef0123456789xyzw";
+    const size_t kValidHexPairs = 8;
+    StringExtractor ex(kHexEncodedBytes);
+
+    uint8_t dst[12];
+    ASSERT_EQ(kValidHexPairs, ex.GetHexBytes (dst, sizeof(dst), 0xde));
+    EXPECT_EQ(0xab,dst[0]);
+    EXPECT_EQ(0xcd,dst[1]);
+    EXPECT_EQ(0xef,dst[2]);
+    EXPECT_EQ(0x01,dst[3]);
+    EXPECT_EQ(0x23,dst[4]);
+    EXPECT_EQ(0x45,dst[5]);
+    EXPECT_EQ(0x67,dst[6]);
+    EXPECT_EQ(0x89,dst[7]);
+    // these bytes should be filled with fail_fill_value 0xde
+    EXPECT_EQ(0xde,dst[8]);
+    EXPECT_EQ(0xde,dst[9]);
+    EXPECT_EQ(0xde,dst[10]);
+    EXPECT_EQ(0xde,dst[11]);
+
+    ASSERT_EQ(false, ex.IsGood());
+    ASSERT_EQ(UINT64_MAX, ex.GetFilePos());
+    ASSERT_EQ(false, ex.Empty());
+    ASSERT_EQ(0, ex.GetBytesLeft());
+    ASSERT_EQ(0, ex.Peek());
+}
+
+TEST_F (StringExtractorTest, GetHexBytes_Partial)
+{
+    const char kHexEncodedBytes[] = "abcdef0123456789xyzw";
+    const size_t kReadBytes = 4;
+    StringExtractor ex(kHexEncodedBytes);
+
+    uint8_t dst[12];
+    memset(dst, 0xab, sizeof(dst));
+    ASSERT_EQ(kReadBytes, ex.GetHexBytes (dst, kReadBytes, 0xde));
+    EXPECT_EQ(0xab,dst[0]);
+    EXPECT_EQ(0xcd,dst[1]);
+    EXPECT_EQ(0xef,dst[2]);
+    EXPECT_EQ(0x01,dst[3]);
+    // these bytes should be unchanged
+    EXPECT_EQ(0xab,dst[4]);
+    EXPECT_EQ(0xab,dst[5]);
+    EXPECT_EQ(0xab,dst[6]);
+    EXPECT_EQ(0xab,dst[7]);
+    EXPECT_EQ(0xab,dst[8]);
+    EXPECT_EQ(0xab,dst[9]);
+    EXPECT_EQ(0xab,dst[10]);
+    EXPECT_EQ(0xab,dst[11]);
+
+    ASSERT_EQ(true, ex.IsGood());
+    ASSERT_EQ(kReadBytes*2, ex.GetFilePos());
+    ASSERT_EQ(false, ex.Empty());
+    ASSERT_EQ(12, ex.GetBytesLeft());
+    ASSERT_EQ('2', *ex.Peek());
+}