Add some missing JNI string functions, GetObjectArrayElement, and all the primitive array region functions.
This also pulls the UTF-8/UTF-16 functions out of class String.
Change-Id: I75936b84fd619c9cf91f6e6a6037488220b05781
diff --git a/src/utf.h b/src/utf.h
new file mode 100644
index 0000000..a9d29a6
--- /dev/null
+++ b/src/utf.h
@@ -0,0 +1,51 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+
+#ifndef ART_SRC_UTF_H_
+#define ART_SRC_UTF_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace art {
+
+/*
+ * 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 Modified UTF-8 to UTF-16.
+ * http://en.wikipedia.org/wiki/UTF-8#Modified_UTF-8
+ */
+void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_data_out, const char* utf8_data_in);
+
+/*
+ * The java.lang.String hashCode() algorithm.
+ */
+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_