2 files changed, 121 insertions, 0 deletions
diff --git a/src/corefx/System.Globalization.Native/CMakeLists.txt b/src/corefx/System.Globalization.Native/CMakeLists.txt
index 9fc28d3ad0..47b5dd5bd3 100644
--- a/src/corefx/System.Globalization.Native/CMakeLists.txt
+++ b/src/corefx/System.Globalization.Native/CMakeLists.txt
@@ -15,6 +15,7 @@ endif()
 add_compile_options(-fPIC)
 
 set(NATIVEGLOBALIZATION_SOURCES
+    casing.cpp
     idna.cpp
     normalization.cpp
 )
diff --git a/src/corefx/System.Globalization.Native/casing.cpp b/src/corefx/System.Globalization.Native/casing.cpp
new file mode 100644
index 0000000000..e7cd85b3f0
--- /dev/null
+++ b/src/corefx/System.Globalization.Native/casing.cpp
@@ -0,0 +1,120 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+#include <assert.h>
+#include <stdint.h>
+#include <unicode/uchar.h>
+#include <unicode/utf16.h>
+
+/*
+Function:
+ToUpperSimple
+*/
+extern "C" void ToUpperSimple(const UChar* lpSrc, int32_t cwSrcLength, UChar* lpDst, int32_t cwDstLength)
+{
+    int32_t srcIdx = 0;
+    int32_t dstIdx = 0;
+
+    UBool isError = FALSE;
+
+    while (srcIdx < cwSrcLength)
+    {
+        UChar32 srcCodepoint;
+        UChar32 dstCodepoint;
+
+        U16_NEXT(lpSrc, srcIdx, cwSrcLength, srcCodepoint);
+        dstCodepoint = u_toupper(srcCodepoint);
+
+        U16_APPEND(lpDst, dstIdx, cwDstLength, dstCodepoint, isError);
+
+        // Ensure that we wrote the data and the source codepoint when encoded in UTF16 is the same
+        // number of code units as the cased codepoint.
+        assert(isError == FALSE && srcIdx == dstIdx);
+    }
+}
+
+/*
+Function:
+ToLowerSimple
+*/
+extern "C" void ToLowerSimple(const UChar* lpSrc, int32_t cwSrcLength, UChar* lpDst, int32_t cwDstLength)
+{
+    int32_t srcIdx = 0;
+    int32_t dstIdx = 0;
+
+    UBool isError = FALSE;
+
+    while (srcIdx < cwSrcLength)
+    {
+        UChar32 srcCodepoint;
+        UChar32 dstCodepoint;
+
+        U16_NEXT(lpSrc, srcIdx, cwSrcLength, srcCodepoint);
+        dstCodepoint = u_tolower(srcCodepoint);
+
+        U16_APPEND(lpDst, dstIdx, cwDstLength, dstCodepoint, isError);
+
+        // Ensure that we wrote the data and the source codepoint when encoded in UTF16 is the same
+        // number of code units as the cased codepoint.
+        assert(isError == FALSE && srcIdx == dstIdx);
+    }
+}
+
+/*
+Function:
+ToUpperSimpleTurkishAzeri
+*/
+extern "C" void ToUpperSimpleTurkishAzeri(const UChar* lpSrc, int32_t cwSrcLength, UChar* lpDst, int32_t cwDstLength)
+{
+    int32_t srcIdx = 0;
+    int32_t dstIdx = 0;
+
+    UBool isError = FALSE;
+
+    while (srcIdx < cwSrcLength)
+    {
+        UChar32 srcCodepoint;
+        UChar32 dstCodepoint;
+
+        U16_NEXT(lpSrc, srcIdx, cwSrcLength, srcCodepoint);
+
+        dstCodepoint = ((srcCodepoint == (UChar32)0x0069) ? (UChar32)0x0130 : u_toupper(srcCodepoint));
+
+        U16_APPEND(lpDst, dstIdx, cwDstLength, dstCodepoint, isError);
+
+        // Ensure that we wrote the data and the source codepoint when encoded in UTF16 is the same
+        // number of code units as the cased codepoint.
+        assert(isError == FALSE && srcIdx == dstIdx);
+    }
+}
+
+/*
+Function:
+ToLowerSimpleTurkishAzeri
+*/
+extern "C" void ToLowerSimpleTurkishAzeri(const UChar* lpSrc, int32_t cwSrcLength, UChar* lpDst, int32_t cwDstLength)
+{
+    int32_t srcIdx = 0;
+    int32_t dstIdx = 0;
+
+    UBool isError = FALSE;
+
+    while (srcIdx < cwSrcLength)
+    {
+        UChar32 srcCodepoint;
+        UChar32 dstCodepoint;
+
+        U16_NEXT(lpSrc, srcIdx, cwSrcLength, srcCodepoint);
+
+        dstCodepoint = ((srcCodepoint == (UChar32)0x0049) ? (UChar32)0x0131 : u_tolower(srcCodepoint));
+
+        U16_APPEND(lpDst, dstIdx, cwDstLength, dstCodepoint, isError);
+
+        // Ensure that we wrote the data and the source codepoint when encoded in UTF16 is the same
+        // number of code units as the cased codepoint.
+        assert(isError == FALSE && srcIdx == dstIdx);
+    }
+}
+