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diff --git a/runtime/utf.h b/runtime/utf.h
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+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_UTF_H_
+#define ART_SRC_UTF_H_
+
+#include "base/macros.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+ * All UTF-8 in art is actually modified UTF-8. Mostly, this distinction
+ * doesn't matter.
+ *
+ * See http://en.wikipedia.org/wiki/UTF-8#Modified_UTF-8 for the details.
+ */
+namespace art {
+namespace mirror {
+template<class T> class PrimitiveArray;
+typedef PrimitiveArray<uint16_t> CharArray;
+}  // namespace mirror
+
+/*
+ * Returns the number of UTF-16 characters in the given modified UTF-8 string.
+ */
+size_t CountModifiedUtf8Chars(const char* utf8);
+
+/*
+ * Returns the number of modified UTF-8 bytes needed to represent the given
+ * UTF-16 string.
+ */
+size_t CountUtf8Bytes(const uint16_t* chars, size_t char_count);
+
+/*
+ * Convert from Modified UTF-8 to UTF-16.
+ */
+void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_out, const char* utf8_in);
+
+/*
+ * Compare two modified UTF-8 strings as UTF-16 code point values in a non-locale sensitive manner
+ */
+int CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(const char* utf8_1, const char* utf8_2);
+
+/*
+ * Compare a modified UTF-8 string with a UTF-16 string as code point values in a non-locale
+ * sensitive manner.
+ */
+int CompareModifiedUtf8ToUtf16AsCodePointValues(const char* utf8_1, const uint16_t* utf8_2);
+
+/*
+ * Convert from UTF-16 to Modified UTF-8. Note that the output is _not_
+ * NUL-terminated. You probably need to call CountUtf8Bytes before calling
+ * this anyway, so if you want a NUL-terminated string, you know where to
+ * put the NUL byte.
+ */
+void ConvertUtf16ToModifiedUtf8(char* utf8_out, const uint16_t* utf16_in, size_t char_count);
+
+/*
+ * The java.lang.String hashCode() algorithm.
+ */
+int32_t ComputeUtf16Hash(const mirror::CharArray* chars, int32_t offset, size_t char_count)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count);
+
+/*
+ * Retrieve the next UTF-16 character from a UTF-8 string.
+ *
+ * Advances "*utf8_data_in" to the start of the next character.
+ *
+ * WARNING: If a string is corrupted by dropping a '\0' in the middle
+ * of a 3-byte sequence, you can end up overrunning the buffer with
+ * reads (and possibly with the writes if the length was computed and
+ * cached before the damage). For performance reasons, this function
+ * assumes that the string being parsed is known to be valid (e.g., by
+ * already being verified). Most strings we process here are coming
+ * out of dex files or other internal translations, so the only real
+ * risk comes from the JNI NewStringUTF call.
+ */
+uint16_t GetUtf16FromUtf8(const char** utf8_data_in);
+
+}  // namespace art
+
+#endif  // ART_SRC_UTF_H_