android_text_AndroidCharacter.cpp revision a9886c580b299984e62303a995bf7b13276b5bc8 
1/* //device/libs/android_runtime/android_text_AndroidCharacter.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "AndroidUnicode"
19
20#include <jni.h>
21#include <android_runtime/AndroidRuntime.h>
22#include "utils/misc.h"
23#include "utils/Log.h"
24#include "unicode/uchar.h"
25
26#define DIRECTIONALITY_UNDEFINED (-1)
27// ICU => JDK mapping
28static int directionality_map[U_CHAR_DIRECTION_COUNT] = {
29    0, // U_LEFT_TO_RIGHT (0) => DIRECTIONALITY_LEFT_TO_RIGHT (0)
30    1, // U_RIGHT_TO_LEFT (1) => DIRECTIONALITY_RIGHT_TO_LEFT (1)
31    3, // U_EUROPEAN_NUMBER (2) => DIRECTIONALITY_EUROPEAN_NUMBER (3)
32    4, // U_EUROPEAN_NUMBER_SEPARATOR (3) => DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR (4)
33    5, // U_EUROPEAN_NUMBER_TERMINATOR (4) => DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR (5)
34    6, // U_ARABIC_NUMBER (5) => DIRECTIONALITY_ARABIC_NUMBER (6)
35    7, // U_COMMON_NUMBER_SEPARATOR (6) => DIRECTIONALITY_COMMON_NUMBER_SEPARATOR (7)
36    10, // U_BLOCK_SEPARATOR (7) => DIRECTIONALITY_PARAGRAPH_SEPARATOR (10)
37    11, // U_SEGMENT_SEPARATOR (8) => DIRECTIONALITY_SEGMENT_SEPARATOR (11)
38    12, // U_WHITE_SPACE_NEUTRAL (9) => DIRECTIONALITY_WHITESPACE (12)
39    13, // U_OTHER_NEUTRAL (10) => DIRECTIONALITY_OTHER_NEUTRALS (13)
40    14, // U_LEFT_TO_RIGHT_EMBEDDING (11) => DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING (14)
41    15, // U_LEFT_TO_RIGHT_OVERRIDE (12) => DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE (15)
42    2, // U_RIGHT_TO_LEFT_ARABIC (13) => DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC (2)
43    16, // U_RIGHT_TO_LEFT_EMBEDDING (14) => DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING (16)
44    17, // U_RIGHT_TO_LEFT_OVERRIDE (15) => DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE (17)
45    18, // U_POP_DIRECTIONAL_FORMAT (16) => DIRECTIONALITY_POP_DIRECTIONAL_FORMAT (18)
46    8, // U_DIR_NON_SPACING_MARK (17) => DIRECTIONALITY_NONSPACING_MARK (8)
47    9, // U_BOUNDARY_NEUTRAL (18) => DIRECTIONALITY_BOUNDARY_NEUTRAL (9)
48};
49
50namespace android {
51
52static void jniThrowException(JNIEnv* env, const char* exc, const char* msg = NULL)
53{
54    jclass excClazz = env->FindClass(exc);
55    LOG_ASSERT(excClazz, "Unable to find class %s", exc);
56
57    env->ThrowNew(excClazz, msg);
58}
59
60static void getDirectionalities(JNIEnv* env, jobject obj, jcharArray srcArray, jbyteArray destArray, int count)
61{
62    jchar* src = env->GetCharArrayElements(srcArray, NULL);
63    jbyte* dest = env->GetByteArrayElements(destArray, NULL);
64    if (src == NULL || dest == NULL) {
65        jniThrowException(env, "java/lang/NullPointerException", NULL);
66        goto DIRECTION_END;
67    }
68
69    if (env->GetArrayLength(srcArray) < count || env->GetArrayLength(destArray) < count) {
70        jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
71        goto DIRECTION_END;
72    }
73
74    for (int i = 0; i < count; i++) {
75        if (src[i] >= 0xD800 && src[i] <= 0xDBFF &&
76            i + 1 < count &&
77            src[i + 1] >= 0xDC00 && src[i + 1] <= 0xDFFF) {
78            int c = 0x00010000 + ((src[i] - 0xD800) << 10) +
79                                 (src[i + 1] & 0x3FF);
80            int dir = u_charDirection(c);
81            if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
82                dir = DIRECTIONALITY_UNDEFINED;
83            else
84                dir = directionality_map[dir];
85
86            dest[i++] = dir;
87            dest[i] = dir;
88        } else {
89            int c = src[i];
90            int dir = u_charDirection(c);
91            if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
92                dest[i] = DIRECTIONALITY_UNDEFINED;
93            else
94                dest[i] = directionality_map[dir];
95        }
96    }
97
98DIRECTION_END:
99    env->ReleaseCharArrayElements(srcArray, src, JNI_ABORT);
100    env->ReleaseByteArrayElements(destArray, dest, JNI_ABORT);
101}
102
103static jboolean mirror(JNIEnv* env, jobject obj, jcharArray charArray, int start, int count)
104{
105    jchar* data = env->GetCharArrayElements(charArray, NULL);
106    bool ret = false;
107
108    if (data == NULL) {
109        jniThrowException(env, "java/lang/NullPointerException", NULL);
110        goto MIRROR_END;
111    }
112
113    if (start > start + count || env->GetArrayLength(charArray) < count) {
114        jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
115        goto MIRROR_END;
116    }
117
118    for (int i = start; i < start + count; i++) {
119        // XXX this thinks it knows that surrogates are never mirrored
120
121        int c1 = data[i];
122        int c2 = u_charMirror(c1);
123
124        if (c1 != c2) {
125            data[i] = c2;
126            ret = true;
127        }
128    }
129
130MIRROR_END:
131    env->ReleaseCharArrayElements(charArray, data, JNI_ABORT);
132	return ret;
133}
134
135static jchar getMirror(JNIEnv* env, jobject obj, jchar c)
136{
137    return u_charMirror(c);
138}
139
140static JNINativeMethod gMethods[] = {
141	{ "getDirectionalities", "([C[BI)V",
142        (void*) getDirectionalities },
143	{ "mirror", "([CII)Z",
144        (void*) mirror },
145	{ "getMirror", "(C)C",
146        (void*) getMirror }
147};
148
149int register_android_text_AndroidCharacter(JNIEnv* env)
150{
151    jclass clazz = env->FindClass("android/text/AndroidCharacter");
152    LOG_ASSERT(clazz, "Cannot find android/text/AndroidCharacter");
153
154    return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidCharacter",
155            gMethods, NELEM(gMethods));
156}
157
158}
159