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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 "JNIHelp.h"
     21 #include "ScopedPrimitiveArray.h"
     22 #include <android_runtime/AndroidRuntime.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, jbyteArray destArray, int count)
     55 {
     56     ScopedCharArrayRO src(env, srcArray);
     57     if (src.get() == NULL) {
     58         return;
     59     }
     60     ScopedByteArrayRW dest(env, destArray);
     61     if (dest.get() == NULL) {
     62         return;
     63     }
     64 
     65     if (env->GetArrayLength(srcArray) < count || env->GetArrayLength(destArray) < count) {
     66         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
     67         return;
     68     }
     69 
     70     for (int i = 0; i < count; i++) {
     71         if (src[i] >= 0xD800 && src[i] <= 0xDBFF &&
     72             i + 1 < count &&
     73             src[i + 1] >= 0xDC00 && src[i + 1] <= 0xDFFF) {
     74             int c = 0x00010000 + ((src[i] - 0xD800) << 10) +
     75                                  (src[i + 1] & 0x3FF);
     76             int dir = u_charDirection(c);
     77             if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
     78                 dir = PROPERTY_UNDEFINED;
     79             else
     80                 dir = directionality_map[dir];
     81 
     82             dest[i++] = dir;
     83             dest[i] = dir;
     84         } else {
     85             int c = src[i];
     86             int dir = u_charDirection(c);
     87             if (dir < 0 || dir >= U_CHAR_DIRECTION_COUNT)
     88                 dest[i] = PROPERTY_UNDEFINED;
     89             else
     90                 dest[i] = directionality_map[dir];
     91         }
     92     }
     93 }
     94 
     95 static jint getEastAsianWidth(JNIEnv* env, jobject obj, jchar input)
     96 {
     97     int width = u_getIntPropertyValue(input, UCHAR_EAST_ASIAN_WIDTH);
     98     if (width < 0 || width >= U_EA_COUNT)
     99         width = PROPERTY_UNDEFINED;
    100 
    101     return width;
    102 }
    103 
    104 static void getEastAsianWidths(JNIEnv* env, jobject obj, jcharArray srcArray,
    105                                int start, int count, jbyteArray destArray)
    106 {
    107     ScopedCharArrayRO src(env, srcArray);
    108     if (src.get() == NULL) {
    109         return;
    110     }
    111     ScopedByteArrayRW dest(env, destArray);
    112     if (dest.get() == NULL) {
    113         return;
    114     }
    115 
    116     if (start < 0 || start > start + count
    117             || env->GetArrayLength(srcArray) < (start + count)
    118             || env->GetArrayLength(destArray) < count) {
    119         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
    120         return;
    121     }
    122 
    123     for (int i = 0; i < count; i++) {
    124         const int srci = start + i;
    125         if (src[srci] >= 0xD800 && src[srci] <= 0xDBFF &&
    126             i + 1 < count &&
    127             src[srci + 1] >= 0xDC00 && src[srci + 1] <= 0xDFFF) {
    128             int c = 0x00010000 + ((src[srci] - 0xD800) << 10) +
    129                                  (src[srci + 1] & 0x3FF);
    130             int width = u_getIntPropertyValue(c, UCHAR_EAST_ASIAN_WIDTH);
    131             if (width < 0 || width >= U_EA_COUNT)
    132                 width = PROPERTY_UNDEFINED;
    133 
    134             dest[i++] = width;
    135             dest[i] = width;
    136         } else {
    137             int c = src[srci];
    138             int width = u_getIntPropertyValue(c, UCHAR_EAST_ASIAN_WIDTH);
    139             if (width < 0 || width >= U_EA_COUNT)
    140                 width = PROPERTY_UNDEFINED;
    141 
    142             dest[i] = width;
    143         }
    144     }
    145 }
    146 
    147 static jboolean mirror(JNIEnv* env, jobject obj, jcharArray charArray, int start, int count)
    148 {
    149     ScopedCharArrayRW data(env, charArray);
    150     if (data.get() == NULL) {
    151         return false;
    152     }
    153 
    154     if (start < 0 || start > start + count
    155             || env->GetArrayLength(charArray) < start + count) {
    156         jniThrowException(env, "java/lang/ArrayIndexOutOfBoundsException", NULL);
    157         return false;
    158     }
    159 
    160     for (int i = start; i < start + count; i++) {
    161         // XXX this thinks it knows that surrogates are never mirrored
    162 
    163         int c1 = data[i];
    164         int c2 = u_charMirror(c1);
    165 
    166         if (c1 != c2) {
    167             data[i] = c2;
    168             return true;
    169         }
    170     }
    171     return false;
    172 }
    173 
    174 static jchar getMirror(JNIEnv* env, jobject obj, jchar c)
    175 {
    176     return u_charMirror(c);
    177 }
    178 
    179 static JNINativeMethod gMethods[] = {
    180 	{ "getDirectionalities", "([C[BI)V",
    181         (void*) getDirectionalities },
    182 	{ "getEastAsianWidth", "(C)I",
    183         (void*) getEastAsianWidth },
    184 	{ "getEastAsianWidths", "([CII[B)V",
    185         (void*) getEastAsianWidths },
    186 	{ "mirror", "([CII)Z",
    187         (void*) mirror },
    188 	{ "getMirror", "(C)C",
    189         (void*) getMirror }
    190 };
    191 
    192 int register_android_text_AndroidCharacter(JNIEnv* env)
    193 {
    194     return AndroidRuntime::registerNativeMethods(env, "android/text/AndroidCharacter",
    195             gMethods, NELEM(gMethods));
    196 }
    197 
    198 }
    199