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      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 <nativehelper/JNIHelp.h>
     21 #include <nativehelper/ScopedPrimitiveArray.h>
     22 #include "core_jni_helpers.h"
     23 #include "utils/misc.h"
     24 #include "utils/Log.h"
     25 #include "unicode/uchar.h"
     26 
     27 #define PROPERTY_UNDEFINED (-1)
     28 
     29 // ICU => JDK mapping
     30 static int directionality_map[U_CHAR_DIRECTION_COUNT] = {
     31     0, // U_LEFT_TO_RIGHT (0) => DIRECTIONALITY_LEFT_TO_RIGHT (0)
     32     1, // U_RIGHT_TO_LEFT (1) => DIRECTIONALITY_RIGHT_TO_LEFT (1)
     33     3, // U_EUROPEAN_NUMBER (2) => DIRECTIONALITY_EUROPEAN_NUMBER (3)
     34     4, // U_EUROPEAN_NUMBER_SEPARATOR (3) => DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR (4)
     35     5, // U_EUROPEAN_NUMBER_TERMINATOR (4) => DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR (5)
     36     6, // U_ARABIC_NUMBER (5) => DIRECTIONALITY_ARABIC_NUMBER (6)
     37     7, // U_COMMON_NUMBER_SEPARATOR (6) => DIRECTIONALITY_COMMON_NUMBER_SEPARATOR (7)
     38     10, // U_BLOCK_SEPARATOR (7) => DIRECTIONALITY_PARAGRAPH_SEPARATOR (10)
     39     11, // U_SEGMENT_SEPARATOR (8) => DIRECTIONALITY_SEGMENT_SEPARATOR (11)
     40     12, // U_WHITE_SPACE_NEUTRAL (9) => DIRECTIONALITY_WHITESPACE (12)
     41     13, // U_OTHER_NEUTRAL (10) => DIRECTIONALITY_OTHER_NEUTRALS (13)
     42     14, // U_LEFT_TO_RIGHT_EMBEDDING (11) => DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING (14)
     43     15, // U_LEFT_TO_RIGHT_OVERRIDE (12) => DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE (15)
     44     2, // U_RIGHT_TO_LEFT_ARABIC (13) => DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC (2)
     45     16, // U_RIGHT_TO_LEFT_EMBEDDING (14) => DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING (16)
     46     17, // U_RIGHT_TO_LEFT_OVERRIDE (15) => DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE (17)
     47     18, // U_POP_DIRECTIONAL_FORMAT (16) => DIRECTIONALITY_POP_DIRECTIONAL_FORMAT (18)
     48     8, // U_DIR_NON_SPACING_MARK (17) => DIRECTIONALITY_NONSPACING_MARK (8)
     49     9, // U_BOUNDARY_NEUTRAL (18) => DIRECTIONALITY_BOUNDARY_NEUTRAL (9)
     50 };
     51 
     52 namespace android {
     53 
     54 static void getDirectionalities(JNIEnv* env, jobject obj, jcharArray srcArray,
     55                                 jbyteArray destArray, jint count)
     56 {
     57     ScopedCharArrayRO src(env, srcArray);
     58     if (src.get() == NULL) {
     59         return;
     60     }
     61     ScopedByteArrayRW dest(env, destArray);
     62     if (dest.get() == NULL) {
     63         return;
     64     }
     65 
     66     if (env->GetArrayLength(srcArray) < count || env->GetArrayLength(destArray) < count) {
     67         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
     68         return;
     69     }
     70 
     71     for (int i = 0; i < count; i++) {
     72         if (src[i] >= 0xD800 && src[i] <= 0xDBFF &&
     73             i + 1 < count &&
     74             src[i + 1] >= 0xDC00 && src[i + 1] <= 0xDFFF) {
     75             int c = 0x00010000 + ((src[i] - 0xD800) << 10) +
     76                                  (src[i + 1] & 0x3FF);
     77             int dir = u_charDirection(c);
     78             if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
     79                 dir = PROPERTY_UNDEFINED;
     80             else
     81                 dir = directionality_map[dir];
     82 
     83             dest[i++] = dir;
     84             dest[i] = dir;
     85         } else {
     86             int c = src[i];
     87             int dir = u_charDirection(c);
     88             if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
     89                 dest[i] = PROPERTY_UNDEFINED;
     90             else
     91                 dest[i] = directionality_map[dir];
     92         }
     93     }
     94 }
     95 
     96 static jint getEastAsianWidth(JNIEnv* env, jobject obj, jchar input)
     97 {
     98     int width = u_getIntPropertyValue(input, UCHAR_EAST_ASIAN_WIDTH);
     99     if (width < 0 || width >= U_EA_COUNT)
    100         width = PROPERTY_UNDEFINED;
    101 
    102     return width;
    103 }
    104 
    105 static void getEastAsianWidths(JNIEnv* env, jobject obj, jcharArray srcArray,
    106                                jint start, jint count, jbyteArray destArray)
    107 {
    108     ScopedCharArrayRO src(env, srcArray);
    109     if (src.get() == NULL) {
    110         return;
    111     }
    112     ScopedByteArrayRW dest(env, destArray);
    113     if (dest.get() == NULL) {
    114         return;
    115     }
    116 
    117     if (start < 0 || start > start + count
    118             || env->GetArrayLength(srcArray) < (start + count)
    119             || env->GetArrayLength(destArray) < count) {
    120         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
    121         return;
    122     }
    123 
    124     for (int i = 0; i < count; i++) {
    125         const int srci = start + i;
    126         if (src[srci] >= 0xD800 && src[srci] <= 0xDBFF &&
    127             i + 1 < count &&
    128             src[srci + 1] >= 0xDC00 && src[srci + 1] <= 0xDFFF) {
    129             int c = 0x00010000 + ((src[srci] - 0xD800) << 10) +
    130                                  (src[srci + 1] & 0x3FF);
    131             int width = u_getIntPropertyValue(c, UCHAR_EAST_ASIAN_WIDTH);
    132             if (width < 0 || width >= U_EA_COUNT)
    133                 width = PROPERTY_UNDEFINED;
    134 
    135             dest[i++] = width;
    136             dest[i] = width;
    137         } else {
    138             int c = src[srci];
    139             int width = u_getIntPropertyValue(c, UCHAR_EAST_ASIAN_WIDTH);
    140             if (width < 0 || width >= U_EA_COUNT)
    141                 width = PROPERTY_UNDEFINED;
    142 
    143             dest[i] = width;
    144         }
    145     }
    146 }
    147 
    148 static jboolean mirror(JNIEnv* env, jobject obj, jcharArray charArray, jint start, jint count)
    149 {
    150     ScopedCharArrayRW data(env, charArray);
    151     if (data.get() == NULL) {
    152         return JNI_FALSE;
    153     }
    154 
    155     if (start < 0 || start > start + count
    156             || env->GetArrayLength(charArray) < start + count) {
    157         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
    158         return JNI_FALSE;
    159     }
    160 
    161     jboolean ret = JNI_FALSE;
    162     for (int i = start; i < start + count; i++) {
    163         // XXX this thinks it knows that surrogates are never mirrored
    164 
    165         int c1 = data[i];
    166         int c2 = u_charMirror(c1);
    167 
    168         if (c1 != c2) {
    169             data[i] = c2;
    170             ret = JNI_TRUE;
    171         }
    172     }
    173     return ret;
    174 }
    175 
    176 static jchar getMirror(JNIEnv* env, jobject obj, jchar c)
    177 {
    178     return u_charMirror(c);
    179 }
    180 
    181 static const JNINativeMethod gMethods[] = {
    182 	{ "getDirectionalities", "([C[BI)V",
    183         (void*) getDirectionalities },
    184 	{ "getEastAsianWidth", "(C)I",
    185         (void*) getEastAsianWidth },
    186 	{ "getEastAsianWidths", "([CII[B)V",
    187         (void*) getEastAsianWidths },
    188 	{ "mirror", "([CII)Z",
    189         (void*) mirror },
    190 	{ "getMirror", "(C)C",
    191         (void*) getMirror }
    192 };
    193 
    194 int register_android_text_AndroidCharacter(JNIEnv* env)
    195 {
    196     return RegisterMethodsOrDie(env, "android/text/AndroidCharacter", gMethods, NELEM(gMethods));
    197 }
    198 
    199 }
    200