A part of efforts of unbundling LatinIME: Get rid of ICU dependency in the native code.

This is actually a back merge from the LatinIME sandbox.  Please refer to
http://arvarest.i.corp.google.com:8080/#change,77

Change-Id: I3ff3781903d5c642c662c2d744f808be7e4d8997

native/Android.mk

@@ -5,10 +5,10 @@ LOCAL_C_INCLUDES += $(LOCAL_PATH)/src
 
 LOCAL_SRC_FILES := \
 	jni/com_android_inputmethod_latin_BinaryDictionary.cpp \
-	src/dictionary.cpp
+	src/dictionary.cpp \
+	src/char_utils.cpp
 
 LOCAL_C_INCLUDES += \
-    external/icu4c/common \
 	$(JNI_H_INCLUDE)
 
 LOCAL_LDLIBS := -lm
@@ -18,8 +18,7 @@ LOCAL_PRELINK_MODULE := false
 LOCAL_SHARED_LIBRARIES := \
     libandroid_runtime \
     libcutils \
-    libutils \
-    libicuuc
+    libutils
 
 LOCAL_MODULE := libjni_latinime
 

native/src/char_utils.h

+/*
+ * Copyright (C) 2010 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 LATINIME_CHAR_UTILS_H
+#define LATINIME_CHAR_UTILS_H
+
+namespace latinime {
+
+unsigned short latin_tolower(unsigned short c);
+
+}; // namespace latinime
+
+#endif // LATINIME_CHAR_UTILS_H

native/src/dictionary.cpp

@@ -21,8 +21,6 @@
 #include <string.h>
 #include <cutils/log.h>
 
-#include <unicode/uchar.h>
-
 //#define USE_ASSET_MANAGER
 
 #ifdef USE_ASSET_MANAGER
@@ -32,6 +30,7 @@
 
 #include "dictionary.h"
 #include "basechars.h"
+#include "char_utils.h"
 
 #define DEBUG_DICT 0
 
@@ -176,7 +175,7 @@ Dictionary::toLowerCase(unsigned short c) {
     if (c >='A' && c <= 'Z') {
         c |= 32;
     } else if (c > 127) {
-        c = u_tolower(c);
+        c = latin_tolower(c);
     }
     return c;
 }