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[apple/icu.git] / icuSources / common / ushape.cpp
1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ******************************************************************************
5 *
6 * Copyright (C) 2000-2016, International Business Machines
7 * Corporation and others. All Rights Reserved.
8 *
9 ******************************************************************************
10 * file name: ushape.cpp
11 * encoding: UTF-8
12 * tab size: 8 (not used)
13 * indentation:4
14 *
15 * created on: 2000jun29
16 * created by: Markus W. Scherer
17 *
18 * Arabic letter shaping implemented by Ayman Roshdy
19 */
20
21 #include "unicode/utypes.h"
22 #include "unicode/uchar.h"
23 #include "unicode/ustring.h"
24 #include "unicode/ushape.h"
25 #include "cmemory.h"
26 #include "putilimp.h"
27 #include "ustr_imp.h"
28 #include "ubidi_props.h"
29 #include "uassert.h"
30
31 /*
32 * This implementation is designed for 16-bit Unicode strings.
33 * The main assumption is that the Arabic characters and their
34 * presentation forms each fit into a single UChar.
35 * With UTF-8, they occupy 2 or 3 bytes, and more than the ASCII
36 * characters.
37 */
38
39 /*
40 * ### TODO in general for letter shaping:
41 * - the letter shaping code is UTF-16-unaware; needs update
42 * + especially invertBuffer()?!
43 * - needs to handle the "Arabic Tail" that is used in some legacy codepages
44 * as a glyph fragment of wide-glyph letters
45 * + IBM Unicode conversion tables map it to U+200B (ZWSP)
46 * + IBM Egypt has proposed to encode the tail in Unicode among Arabic Presentation Forms
47 * + Unicode 3.2 added U+FE73 ARABIC TAIL FRAGMENT
48 */
49
50 /* definitions for Arabic letter shaping ------------------------------------ */
51
52 #define IRRELEVANT 4
53 #define LAMTYPE 16
54 #define ALEFTYPE 32
55 #define LINKR 1
56 #define LINKL 2
57 #define APRESENT 8
58 #define SHADDA 64
59 #define CSHADDA 128
60 #define COMBINE (SHADDA+CSHADDA)
61
62 #define HAMZAFE_CHAR 0xfe80
63 #define HAMZA06_CHAR 0x0621
64 #define YEH_HAMZA_CHAR 0x0626
65 #define YEH_HAMZAFE_CHAR 0xFE89
66 #define LAMALEF_SPACE_SUB 0xFFFF
67 #define TASHKEEL_SPACE_SUB 0xFFFE
68 #define NEW_TAIL_CHAR 0xFE73
69 #define OLD_TAIL_CHAR 0x200B
70 #define LAM_CHAR 0x0644
71 #define SPACE_CHAR 0x0020
72 #define SHADDA_CHAR 0xFE7C
73 #define TATWEEL_CHAR 0x0640
74 #define SHADDA_TATWEEL_CHAR 0xFE7D
75 #define SHADDA06_CHAR 0x0651
76
77 #define SHAPE_MODE 0
78 #define DESHAPE_MODE 1
79
80 struct uShapeVariables {
81 UChar tailChar;
82 uint32_t uShapeLamalefBegin;
83 uint32_t uShapeLamalefEnd;
84 uint32_t uShapeTashkeelBegin;
85 uint32_t uShapeTashkeelEnd;
86 int spacesRelativeToTextBeginEnd;
87 };
88
89 static const uint8_t tailFamilyIsolatedFinal[] = {
90 /* FEB1 */ 1,
91 /* FEB2 */ 1,
92 /* FEB3 */ 0,
93 /* FEB4 */ 0,
94 /* FEB5 */ 1,
95 /* FEB6 */ 1,
96 /* FEB7 */ 0,
97 /* FEB8 */ 0,
98 /* FEB9 */ 1,
99 /* FEBA */ 1,
100 /* FEBB */ 0,
101 /* FEBC */ 0,
102 /* FEBD */ 1,
103 /* FEBE */ 1
104 };
105
106 static const uint8_t tashkeelMedial[] = {
107 /* FE70 */ 0,
108 /* FE71 */ 1,
109 /* FE72 */ 0,
110 /* FE73 */ 0,
111 /* FE74 */ 0,
112 /* FE75 */ 0,
113 /* FE76 */ 0,
114 /* FE77 */ 1,
115 /* FE78 */ 0,
116 /* FE79 */ 1,
117 /* FE7A */ 0,
118 /* FE7B */ 1,
119 /* FE7C */ 0,
120 /* FE7D */ 1,
121 /* FE7E */ 0,
122 /* FE7F */ 1
123 };
124
125 static const UChar yehHamzaToYeh[] =
126 {
127 /* isolated*/ 0xFEEF,
128 /* final */ 0xFEF0
129 };
130
131 static const uint8_t IrrelevantPos[] = {
132 0x0, 0x2, 0x4, 0x6,
133 0x8, 0xA, 0xC, 0xE
134 };
135
136
137 static const UChar convertLamAlef[] =
138 {
139 /*FEF5*/ 0x0622,
140 /*FEF6*/ 0x0622,
141 /*FEF7*/ 0x0623,
142 /*FEF8*/ 0x0623,
143 /*FEF9*/ 0x0625,
144 /*FEFA*/ 0x0625,
145 /*FEFB*/ 0x0627,
146 /*FEFC*/ 0x0627
147 };
148
149 static const UChar araLink[178]=
150 {
151 1 + 32 + 256 * 0x11,/*0x0622*/
152 1 + 32 + 256 * 0x13,/*0x0623*/
153 1 + 256 * 0x15,/*0x0624*/
154 1 + 32 + 256 * 0x17,/*0x0625*/
155 1 + 2 + 256 * 0x19,/*0x0626*/
156 1 + 32 + 256 * 0x1D,/*0x0627*/
157 1 + 2 + 256 * 0x1F,/*0x0628*/
158 1 + 256 * 0x23,/*0x0629*/
159 1 + 2 + 256 * 0x25,/*0x062A*/
160 1 + 2 + 256 * 0x29,/*0x062B*/
161 1 + 2 + 256 * 0x2D,/*0x062C*/
162 1 + 2 + 256 * 0x31,/*0x062D*/
163 1 + 2 + 256 * 0x35,/*0x062E*/
164 1 + 256 * 0x39,/*0x062F*/
165 1 + 256 * 0x3B,/*0x0630*/
166 1 + 256 * 0x3D,/*0x0631*/
167 1 + 256 * 0x3F,/*0x0632*/
168 1 + 2 + 256 * 0x41,/*0x0633*/
169 1 + 2 + 256 * 0x45,/*0x0634*/
170 1 + 2 + 256 * 0x49,/*0x0635*/
171 1 + 2 + 256 * 0x4D,/*0x0636*/
172 1 + 2 + 256 * 0x51,/*0x0637*/
173 1 + 2 + 256 * 0x55,/*0x0638*/
174 1 + 2 + 256 * 0x59,/*0x0639*/
175 1 + 2 + 256 * 0x5D,/*0x063A*/
176 0, 0, 0, 0, 0, /*0x063B-0x063F*/
177 1 + 2, /*0x0640*/
178 1 + 2 + 256 * 0x61,/*0x0641*/
179 1 + 2 + 256 * 0x65,/*0x0642*/
180 1 + 2 + 256 * 0x69,/*0x0643*/
181 1 + 2 + 16 + 256 * 0x6D,/*0x0644*/
182 1 + 2 + 256 * 0x71,/*0x0645*/
183 1 + 2 + 256 * 0x75,/*0x0646*/
184 1 + 2 + 256 * 0x79,/*0x0647*/
185 1 + 256 * 0x7D,/*0x0648*/
186 1 + 256 * 0x7F,/*0x0649*/
187 1 + 2 + 256 * 0x81,/*0x064A*/
188 4 + 256 * 1, /*0x064B*/
189 4 + 128 + 256 * 1, /*0x064C*/
190 4 + 128 + 256 * 1, /*0x064D*/
191 4 + 128 + 256 * 1, /*0x064E*/
192 4 + 128 + 256 * 1, /*0x064F*/
193 4 + 128 + 256 * 1, /*0x0650*/
194 4 + 64 + 256 * 3, /*0x0651*/
195 4 + 256 * 1, /*0x0652*/
196 4 + 256 * 7, /*0x0653*/
197 4 + 256 * 8, /*0x0654*/
198 4 + 256 * 8, /*0x0655*/
199 4 + 256 * 1, /*0x0656*/
200 0, 0, 0, 0, 0, /*0x0657-0x065B*/
201 1 + 256 * 0x85,/*0x065C*/
202 1 + 256 * 0x87,/*0x065D*/
203 1 + 256 * 0x89,/*0x065E*/
204 1 + 256 * 0x8B,/*0x065F*/
205 0, 0, 0, 0, 0, /*0x0660-0x0664*/
206 0, 0, 0, 0, 0, /*0x0665-0x0669*/
207 0, 0, 0, 0, 0, 0, /*0x066A-0x066F*/
208 4 + 256 * 6, /*0x0670*/
209 1 + 8 + 256 * 0x00,/*0x0671*/
210 1 + 32, /*0x0672*/
211 1 + 32, /*0x0673*/
212 0, /*0x0674*/
213 1 + 32, /*0x0675*/
214 1, 1, /*0x0676-0x0677*/
215 1 + 2, /*0x0678*/
216 1 + 2 + 8 + 256 * 0x16,/*0x0679*/
217 1 + 2 + 8 + 256 * 0x0E,/*0x067A*/
218 1 + 2 + 8 + 256 * 0x02,/*0x067B*/
219 1+2, 1+2, /*0x67C-0x067D*/
220 1+2+8+256 * 0x06, 1+2, 1+2, 1+2, 1+2, 1+2, /*0x067E-0x0683*/
221 1+2, 1+2, 1+2+8+256 * 0x2A, 1+2, /*0x0684-0x0687*/
222 1 + 8 + 256 * 0x38,/*0x0688*/
223 1, 1, 1, /*0x0689-0x068B*/
224 1 + 8 + 256 * 0x34,/*0x068C*/
225 1 + 8 + 256 * 0x32,/*0x068D*/
226 1 + 8 + 256 * 0x36,/*0x068E*/
227 1, 1, /*0x068F-0x0690*/
228 1 + 8 + 256 * 0x3C,/*0x0691*/
229 1, 1, 1, 1, 1, 1, 1+8+256 * 0x3A, 1, /*0x0692-0x0699*/
230 1+2, 1+2, 1+2, 1+2, 1+2, 1+2, /*0x069A-0x06A3*/
231 1+2, 1+2, 1+2, 1+2, /*0x069A-0x06A3*/
232 1+2, 1+2, 1+2, 1+2, 1+2, 1+2+8+256 * 0x3E, /*0x06A4-0x06AD*/
233 1+2, 1+2, 1+2, 1+2, /*0x06A4-0x06AD*/
234 1+2, 1+2+8+256 * 0x42, 1+2, 1+2, 1+2, 1+2, /*0x06AE-0x06B7*/
235 1+2, 1+2, 1+2, 1+2, /*0x06AE-0x06B7*/
236 1+2, 1+2, /*0x06B8-0x06B9*/
237 1 + 8 + 256 * 0x4E,/*0x06BA*/
238 1 + 2 + 8 + 256 * 0x50,/*0x06BB*/
239 1+2, 1+2, /*0x06BC-0x06BD*/
240 1 + 2 + 8 + 256 * 0x5A,/*0x06BE*/
241 1+2, /*0x06BF*/
242 1 + 8 + 256 * 0x54,/*0x06C0*/
243 1 + 2 + 8 + 256 * 0x56,/*0x06C1*/
244 1, 1, 1, /*0x06C2-0x06C4*/
245 1 + 8 + 256 * 0x90,/*0x06C5*/
246 1 + 8 + 256 * 0x89,/*0x06C6*/
247 1 + 8 + 256 * 0x87,/*0x06C7*/
248 1 + 8 + 256 * 0x8B,/*0x06C8*/
249 1 + 8 + 256 * 0x92,/*0x06C9*/
250 1, /*0x06CA*/
251 1 + 8 + 256 * 0x8E,/*0x06CB*/
252 1 + 2 + 8 + 256 * 0xAC,/*0x06CC*/
253 1, /*0x06CD*/
254 1+2, 1+2, /*0x06CE-0x06CF*/
255 1 + 2 + 8 + 256 * 0x94,/*0x06D0*/
256 1+2, /*0x06D1*/
257 1 + 8 + 256 * 0x5E,/*0x06D2*/
258 1 + 8 + 256 * 0x60 /*0x06D3*/
259 };
260
261 static const uint8_t presALink[] = {
262 /***********0*****1*****2*****3*****4*****5*****6*****7*****8*****9*****A*****B*****C*****D*****E*****F*/
263 /*FB5*/ 0, 1, 0, 0, 0, 0, 0, 1, 2,1 + 2, 0, 0, 0, 0, 0, 0,
264 /*FB6*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
265 /*FB7*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2,1 + 2, 0, 0,
266 /*FB8*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1,
267 /*FB9*/ 2,1 + 2, 0, 1, 2,1 + 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
268 /*FBA*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
269 /*FBB*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
270 /*FBC*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
271 /*FBD*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
272 /*FBE*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
273 /*FBF*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2,1 + 2,
274 /*FC0*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
275 /*FC1*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
276 /*FC2*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
277 /*FC3*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
278 /*FC4*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
279 /*FC5*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4,
280 /*FC6*/ 4, 4, 4
281 };
282
283 static const uint8_t presBLink[]=
284 {
285 /***********0*****1*****2*****3*****4*****5*****6*****7*****8*****9*****A*****B*****C*****D*****E*****F*/
286 /*FE7*/1 + 2,1 + 2,1 + 2, 0,1 + 2, 0,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,1 + 2,
287 /*FE8*/ 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2,1 + 2, 0, 1, 0,
288 /*FE9*/ 1, 2,1 + 2, 0, 1, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,
289 /*FEA*/1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 0, 1, 0, 1, 0,
290 /*FEB*/ 1, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,
291 /*FEC*/1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,
292 /*FED*/1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,
293 /*FEE*/1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 2,1 + 2, 0, 1, 0,
294 /*FEF*/ 1, 0, 1, 2,1 + 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0
295 };
296
297 static const UChar convertFBto06[] =
298 {
299 /***********0******1******2******3******4******5******6******7******8******9******A******B******C******D******E******F***/
300 /*FB5*/ 0x671, 0x671, 0x67B, 0x67B, 0x67B, 0x67B, 0x67E, 0x67E, 0x67E, 0x67E, 0, 0, 0, 0, 0x67A, 0x67A,
301 /*FB6*/ 0x67A, 0x67A, 0, 0, 0, 0, 0x679, 0x679, 0x679, 0x679, 0, 0, 0, 0, 0, 0,
302 /*FB7*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x686, 0x686, 0x686, 0x686, 0, 0,
303 /*FB8*/ 0, 0, 0x68D, 0x68D, 0x68C, 0x68C, 0x68E, 0x68E, 0x688, 0x688, 0x698, 0x698, 0x691, 0x691, 0x6A9, 0x6A9,
304 /*FB9*/ 0x6A9, 0x6A9, 0x6AF, 0x6AF, 0x6AF, 0x6AF, 0, 0, 0, 0, 0, 0, 0, 0, 0x6BA, 0x6BA,
305 /*FBA*/ 0x6BB, 0x6BB, 0x6BB, 0x6BB, 0x6C0, 0x6C0, 0x6C1, 0x6C1, 0x6C1, 0x6C1, 0x6BE, 0x6BE, 0x6BE, 0x6BE, 0x6d2, 0x6D2,
306 /*FBB*/ 0x6D3, 0x6D3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
307 /*FBC*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
308 /*FBD*/ 0, 0, 0, 0, 0, 0, 0, 0x6C7, 0x6C7, 0x6C6, 0x6C6, 0x6C8, 0x6C8, 0, 0x6CB, 0x6CB,
309 /*FBE*/ 0x6C5, 0x6C5, 0x6C9, 0x6C9, 0x6D0, 0x6D0, 0x6D0, 0x6D0, 0, 0, 0, 0, 0, 0, 0, 0,
310 /*FBF*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x6CC, 0x6CC, 0x6CC, 0x6CC
311 };
312
313 static const UChar convertFEto06[] =
314 {
315 /***********0******1******2******3******4******5******6******7******8******9******A******B******C******D******E******F***/
316 /*FE7*/ 0x64B, 0x64B, 0x64C, 0x64C, 0x64D, 0x64D, 0x64E, 0x64E, 0x64F, 0x64F, 0x650, 0x650, 0x651, 0x651, 0x652, 0x652,
317 /*FE8*/ 0x621, 0x622, 0x622, 0x623, 0x623, 0x624, 0x624, 0x625, 0x625, 0x626, 0x626, 0x626, 0x626, 0x627, 0x627, 0x628,
318 /*FE9*/ 0x628, 0x628, 0x628, 0x629, 0x629, 0x62A, 0x62A, 0x62A, 0x62A, 0x62B, 0x62B, 0x62B, 0x62B, 0x62C, 0x62C, 0x62C,
319 /*FEA*/ 0x62C, 0x62D, 0x62D, 0x62D, 0x62D, 0x62E, 0x62E, 0x62E, 0x62E, 0x62F, 0x62F, 0x630, 0x630, 0x631, 0x631, 0x632,
320 /*FEB*/ 0x632, 0x633, 0x633, 0x633, 0x633, 0x634, 0x634, 0x634, 0x634, 0x635, 0x635, 0x635, 0x635, 0x636, 0x636, 0x636,
321 /*FEC*/ 0x636, 0x637, 0x637, 0x637, 0x637, 0x638, 0x638, 0x638, 0x638, 0x639, 0x639, 0x639, 0x639, 0x63A, 0x63A, 0x63A,
322 /*FED*/ 0x63A, 0x641, 0x641, 0x641, 0x641, 0x642, 0x642, 0x642, 0x642, 0x643, 0x643, 0x643, 0x643, 0x644, 0x644, 0x644,
323 /*FEE*/ 0x644, 0x645, 0x645, 0x645, 0x645, 0x646, 0x646, 0x646, 0x646, 0x647, 0x647, 0x647, 0x647, 0x648, 0x648, 0x649,
324 /*FEF*/ 0x649, 0x64A, 0x64A, 0x64A, 0x64A, 0x65C, 0x65C, 0x65D, 0x65D, 0x65E, 0x65E, 0x65F, 0x65F
325 };
326
327 static const uint8_t shapeTable[4][4][4]=
328 {
329 { {0,0,0,0}, {0,0,0,0}, {0,1,0,3}, {0,1,0,1} },
330 { {0,0,2,2}, {0,0,1,2}, {0,1,1,2}, {0,1,1,3} },
331 { {0,0,0,0}, {0,0,0,0}, {0,1,0,3}, {0,1,0,3} },
332 { {0,0,1,2}, {0,0,1,2}, {0,1,1,2}, {0,1,1,3} }
333 };
334
335 /*
336 * This function shapes European digits to Arabic-Indic digits
337 * in-place, writing over the input characters.
338 * Since we know that we are only looking for BMP code points,
339 * we can safely just work with code units (again, at least UTF-16).
340 */
341 static void
342 _shapeToArabicDigitsWithContext(UChar *s, int32_t length,
343 UChar digitBase,
344 UBool isLogical, UBool lastStrongWasAL) {
345 const UBiDiProps *bdp;
346 int32_t i;
347 UChar c;
348
349 bdp=ubidi_getSingleton();
350 digitBase-=0x30;
351
352 /* the iteration direction depends on the type of input */
353 if(isLogical) {
354 for(i=0; i<length; ++i) {
355 c=s[i];
356 switch(ubidi_getClass(bdp, c)) {
357 case U_LEFT_TO_RIGHT: /* L */
358 case U_RIGHT_TO_LEFT: /* R */
359 lastStrongWasAL=FALSE;
360 break;
361 case U_RIGHT_TO_LEFT_ARABIC: /* AL */
362 lastStrongWasAL=TRUE;
363 break;
364 case U_EUROPEAN_NUMBER: /* EN */
365 if(lastStrongWasAL && (uint32_t)(c-0x30)<10) {
366 s[i]=(UChar)(digitBase+c); /* digitBase+(c-0x30) - digitBase was modified above */
367 }
368 break;
369 default :
370 break;
371 }
372 }
373 } else {
374 for(i=length; i>0; /* pre-decrement in the body */) {
375 c=s[--i];
376 switch(ubidi_getClass(bdp, c)) {
377 case U_LEFT_TO_RIGHT: /* L */
378 case U_RIGHT_TO_LEFT: /* R */
379 lastStrongWasAL=FALSE;
380 break;
381 case U_RIGHT_TO_LEFT_ARABIC: /* AL */
382 lastStrongWasAL=TRUE;
383 break;
384 case U_EUROPEAN_NUMBER: /* EN */
385 if(lastStrongWasAL && (uint32_t)(c-0x30)<10) {
386 s[i]=(UChar)(digitBase+c); /* digitBase+(c-0x30) - digitBase was modified above */
387 }
388 break;
389 default :
390 break;
391 }
392 }
393 }
394 }
395
396 /*
397 *Name : invertBuffer
398 *Function : This function inverts the buffer, it's used
399 * in case the user specifies the buffer to be
400 * U_SHAPE_TEXT_DIRECTION_LOGICAL
401 */
402 static void
403 invertBuffer(UChar *buffer, int32_t size, uint32_t /*options*/, int32_t lowlimit, int32_t highlimit) {
404 UChar temp;
405 int32_t i=0,j=0;
406 for(i=lowlimit,j=size-highlimit-1;i<j;i++,j--) {
407 temp = buffer[i];
408 buffer[i] = buffer[j];
409 buffer[j] = temp;
410 }
411 }
412
413 /*
414 *Name : changeLamAlef
415 *Function : Converts the Alef characters into an equivalent
416 * LamAlef location in the 0x06xx Range, this is an
417 * intermediate stage in the operation of the program
418 * later it'll be converted into the 0xFExx LamAlefs
419 * in the shaping function.
420 */
421 static inline UChar
422 changeLamAlef(UChar ch) {
423 switch(ch) {
424 case 0x0622 :
425 return 0x065C;
426 case 0x0623 :
427 return 0x065D;
428 case 0x0625 :
429 return 0x065E;
430 case 0x0627 :
431 return 0x065F;
432 }
433 return 0;
434 }
435
436 /*
437 *Name : getLink
438 *Function : Resolves the link between the characters as
439 * Arabic characters have four forms :
440 * Isolated, Initial, Middle and Final Form
441 */
442 static UChar
443 getLink(UChar ch) {
444 if(ch >= 0x0622 && ch <= 0x06D3) {
445 return(araLink[ch-0x0622]);
446 } else if(ch == 0x200D) {
447 return(3);
448 } else if(ch >= 0x206D && ch <= 0x206F) {
449 return(4);
450 }else if(ch >= 0xFB50 && ch <= 0xFC62) {
451 return(presALink[ch-0xFB50]);
452 } else if(ch >= 0xFE70 && ch <= 0xFEFC) {
453 return(presBLink[ch-0xFE70]);
454 }else {
455 return(0);
456 }
457 }
458
459 /*
460 *Name : countSpaces
461 *Function : Counts the number of spaces
462 * at each end of the logical buffer
463 */
464 static void
465 countSpaces(UChar *dest, int32_t size, uint32_t /*options*/, int32_t *spacesCountl, int32_t *spacesCountr) {
466 int32_t i = 0;
467 int32_t countl = 0,countr = 0;
468 while((dest[i] == SPACE_CHAR) && (countl < size)) {
469 countl++;
470 i++;
471 }
472 if (countl < size) { /* the entire buffer is not all space */
473 while(dest[size-1] == SPACE_CHAR) {
474 countr++;
475 size--;
476 }
477 }
478 *spacesCountl = countl;
479 *spacesCountr = countr;
480 }
481
482 /*
483 *Name : isTashkeelChar
484 *Function : Returns 1 for Tashkeel characters in 06 range else return 0
485 */
486 static inline int32_t
487 isTashkeelChar(UChar ch) {
488 return (int32_t)( ch>=0x064B && ch<= 0x0652 );
489 }
490
491 /*
492 *Name : isTashkeelCharFE
493 *Function : Returns 1 for Tashkeel characters in FE range else return 0
494 */
495 static inline int32_t
496 isTashkeelCharFE(UChar ch) {
497 return (int32_t)( ch>=0xFE70 && ch<= 0xFE7F );
498 }
499
500 /*
501 *Name : isAlefChar
502 *Function : Returns 1 for Alef characters else return 0
503 */
504 static inline int32_t
505 isAlefChar(UChar ch) {
506 return (int32_t)( (ch==0x0622)||(ch==0x0623)||(ch==0x0625)||(ch==0x0627) );
507 }
508
509 /*
510 *Name : isLamAlefChar
511 *Function : Returns 1 for LamAlef characters else return 0
512 */
513 static inline int32_t
514 isLamAlefChar(UChar ch) {
515 return (int32_t)((ch>=0xFEF5)&&(ch<=0xFEFC) );
516 }
517
518 /*BIDI
519 *Name : isTailChar
520 *Function : returns 1 if the character matches one of the tail characters (0xfe73 or 0x200b) otherwise returns 0
521 */
522
523 static inline int32_t
524 isTailChar(UChar ch) {
525 if(ch == OLD_TAIL_CHAR || ch == NEW_TAIL_CHAR){
526 return 1;
527 }else{
528 return 0;
529 }
530 }
531
532 /*BIDI
533 *Name : isSeenTailFamilyChar
534 *Function : returns 1 if the character is a seen family isolated character
535 * in the FE range otherwise returns 0
536 */
537
538 static inline int32_t
539 isSeenTailFamilyChar(UChar ch) {
540 if(ch >= 0xfeb1 && ch < 0xfebf){
541 return tailFamilyIsolatedFinal [ch - 0xFEB1];
542 }else{
543 return 0;
544 }
545 }
546
547 /* Name : isSeenFamilyChar
548 * Function : returns 1 if the character is a seen family character in the Unicode
549 * 06 range otherwise returns 0
550 */
551
552 static inline int32_t
553 isSeenFamilyChar(UChar ch){
554 if(ch >= 0x633 && ch <= 0x636){
555 return 1;
556 }else {
557 return 0;
558 }
559 }
560
561 /*Start of BIDI*/
562 /*
563 *Name : isAlefMaksouraChar
564 *Function : returns 1 if the character is a Alef Maksoura Final or isolated
565 * otherwise returns 0
566 */
567 static inline int32_t
568 isAlefMaksouraChar(UChar ch) {
569 return (int32_t)( (ch == 0xFEEF) || ( ch == 0xFEF0) || (ch == 0x0649));
570 }
571
572 /*
573 * Name : isYehHamzaChar
574 * Function : returns 1 if the character is a yehHamza isolated or yehhamza
575 * final is found otherwise returns 0
576 */
577 static inline int32_t
578 isYehHamzaChar(UChar ch) {
579 if((ch==0xFE89)||(ch==0xFE8A)){
580 return 1;
581 }else{
582 return 0;
583 }
584 }
585
586 /*
587 * Name: isTashkeelOnTatweelChar
588 * Function: Checks if the Tashkeel Character is on Tatweel or not,if the
589 * Tashkeel on tatweel (FE range), it returns 1 else if the
590 * Tashkeel with shadda on tatweel (FC range)return 2 otherwise
591 * returns 0
592 */
593 static inline int32_t
594 isTashkeelOnTatweelChar(UChar ch){
595 if(ch >= 0xfe70 && ch <= 0xfe7f && ch != NEW_TAIL_CHAR && ch != 0xFE75 && ch != SHADDA_TATWEEL_CHAR)
596 {
597 return tashkeelMedial [ch - 0xFE70];
598 }else if( (ch >= 0xfcf2 && ch <= 0xfcf4) || (ch == SHADDA_TATWEEL_CHAR)) {
599 return 2;
600 }else{
601 return 0;
602 }
603 }
604
605 /*
606 * Name: isIsolatedTashkeelChar
607 * Function: Checks if the Tashkeel Character is in the isolated form
608 * (i.e. Unicode FE range) returns 1 else if the Tashkeel
609 * with shadda is in the isolated form (i.e. Unicode FC range)
610 * returns 2 otherwise returns 0
611 */
612 static inline int32_t
613 isIsolatedTashkeelChar(UChar ch){
614 if(ch >= 0xfe70 && ch <= 0xfe7f && ch != NEW_TAIL_CHAR && ch != 0xFE75){
615 return (1 - tashkeelMedial [ch - 0xFE70]);
616 }else if(ch >= 0xfc5e && ch <= 0xfc63){
617 return 1;
618 }else{
619 return 0;
620 }
621 }
622
623
624
625
626 /*
627 *Name : calculateSize
628 *Function : This function calculates the destSize to be used in preflighting
629 * when the destSize is equal to 0
630 * It is used also to calculate the new destsize in case the
631 * destination buffer will be resized.
632 */
633
634 static int32_t
635 calculateSize(const UChar *source, int32_t sourceLength,
636 int32_t destSize,uint32_t options) {
637 int32_t i = 0;
638
639 int lamAlefOption = 0;
640 int tashkeelOption = 0;
641
642 destSize = sourceLength;
643
644 if (((options&U_SHAPE_LETTERS_MASK) == U_SHAPE_LETTERS_SHAPE ||
645 ((options&U_SHAPE_LETTERS_MASK) == U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED )) &&
646 ((options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_RESIZE )){
647 lamAlefOption = 1;
648 }
649 if((options&U_SHAPE_LETTERS_MASK) == U_SHAPE_LETTERS_SHAPE &&
650 ((options&U_SHAPE_TASHKEEL_MASK) == U_SHAPE_TASHKEEL_RESIZE ) ){
651 tashkeelOption = 1;
652 }
653
654 if(lamAlefOption || tashkeelOption){
655 if((options&U_SHAPE_TEXT_DIRECTION_MASK)==U_SHAPE_TEXT_DIRECTION_VISUAL_LTR) {
656 for(i=0;i<sourceLength;i++) {
657 if( ((isAlefChar(source[i]))&& (i<(sourceLength-1)) &&(source[i+1] == LAM_CHAR)) || (isTashkeelCharFE(source[i])) ) {
658 destSize--;
659 }
660 }
661 }else if((options&U_SHAPE_TEXT_DIRECTION_MASK)==U_SHAPE_TEXT_DIRECTION_LOGICAL) {
662 for(i=0;i<sourceLength;i++) {
663 if( ( (source[i] == LAM_CHAR) && (i<(sourceLength-1)) && (isAlefChar(source[i+1]))) || (isTashkeelCharFE(source[i])) ) {
664 destSize--;
665 }
666 }
667 }
668 }
669
670 if ((options&U_SHAPE_LETTERS_MASK) == U_SHAPE_LETTERS_UNSHAPE){
671 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_RESIZE){
672 for(i=0;i<sourceLength;i++) {
673 if(isLamAlefChar(source[i]))
674 destSize++;
675 }
676 }
677 }
678
679 return destSize;
680 }
681
682 /*
683 *Name : handleTashkeelWithTatweel
684 *Function : Replaces Tashkeel as following:
685 * Case 1 :if the Tashkeel on tatweel, replace it with Tatweel.
686 * Case 2 :if the Tashkeel aggregated with Shadda on Tatweel, replace
687 * it with Shadda on Tatweel.
688 * Case 3: if the Tashkeel is isolated replace it with Space.
689 *
690 */
691 static int32_t
692 handleTashkeelWithTatweel(UChar *dest, int32_t sourceLength,
693 int32_t /*destSize*/, uint32_t /*options*/,
694 UErrorCode * /*pErrorCode*/) {
695 int i;
696 for(i = 0; i < sourceLength; i++){
697 if((isTashkeelOnTatweelChar(dest[i]) == 1)){
698 dest[i] = TATWEEL_CHAR;
699 }else if((isTashkeelOnTatweelChar(dest[i]) == 2)){
700 dest[i] = SHADDA_TATWEEL_CHAR;
701 }else if(isIsolatedTashkeelChar(dest[i]) && dest[i] != SHADDA_CHAR){
702 dest[i] = SPACE_CHAR;
703 }
704 }
705 return sourceLength;
706 }
707
708
709
710 /*
711 *Name : handleGeneratedSpaces
712 *Function : The shapeUnicode function converts Lam + Alef into LamAlef + space,
713 * and Tashkeel to space.
714 * handleGeneratedSpaces function puts these generated spaces
715 * according to the options the user specifies. LamAlef and Tashkeel
716 * spaces can be replaced at begin, at end, at near or decrease the
717 * buffer size.
718 *
719 * There is also Auto option for LamAlef and tashkeel, which will put
720 * the spaces at end of the buffer (or end of text if the user used
721 * the option U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END).
722 *
723 * If the text type was visual_LTR and the option
724 * U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END was selected the END
725 * option will place the space at the beginning of the buffer and
726 * BEGIN will place the space at the end of the buffer.
727 */
728
729 static int32_t
730 handleGeneratedSpaces(UChar *dest, int32_t sourceLength,
731 int32_t destSize,
732 uint32_t options,
733 UErrorCode *pErrorCode,struct uShapeVariables shapeVars ) {
734
735 int32_t i = 0, j = 0;
736 int32_t count = 0;
737 UChar *tempbuffer=NULL;
738
739 int lamAlefOption = 0;
740 int tashkeelOption = 0;
741 int shapingMode = SHAPE_MODE;
742
743 if (shapingMode == 0){
744 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_RESIZE ){
745 lamAlefOption = 1;
746 }
747 if ( (options&U_SHAPE_TASHKEEL_MASK) == U_SHAPE_TASHKEEL_RESIZE ){
748 tashkeelOption = 1;
749 }
750 }
751
752 tempbuffer = (UChar *)uprv_malloc((sourceLength+1)*U_SIZEOF_UCHAR);
753 /* Test for NULL */
754 if(tempbuffer == NULL) {
755 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
756 return 0;
757 }
758
759
760 if (lamAlefOption || tashkeelOption){
761 uprv_memset(tempbuffer, 0, (sourceLength+1)*U_SIZEOF_UCHAR);
762
763 i = j = 0; count = 0;
764 while(i < sourceLength) {
765 if ( (lamAlefOption && dest[i] == LAMALEF_SPACE_SUB) ||
766 (tashkeelOption && dest[i] == TASHKEEL_SPACE_SUB) ){
767 j--;
768 count++;
769 } else {
770 tempbuffer[j] = dest[i];
771 }
772 i++;
773 j++;
774 }
775
776 while(count >= 0) {
777 tempbuffer[i] = 0x0000;
778 i--;
779 count--;
780 }
781
782 u_memcpy(dest, tempbuffer, sourceLength);
783 destSize = u_strlen(dest);
784 }
785
786 lamAlefOption = 0;
787
788 if (shapingMode == 0){
789 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_NEAR ){
790 lamAlefOption = 1;
791 }
792 }
793
794 if (lamAlefOption){
795 /* Lam+Alef is already shaped into LamAlef + FFFF */
796 i = 0;
797 while(i < sourceLength) {
798 if(lamAlefOption&&dest[i] == LAMALEF_SPACE_SUB){
799 dest[i] = SPACE_CHAR;
800 }
801 i++;
802 }
803 destSize = sourceLength;
804 }
805 lamAlefOption = 0;
806 tashkeelOption = 0;
807
808 if (shapingMode == 0) {
809 if ( ((options&U_SHAPE_LAMALEF_MASK) == shapeVars.uShapeLamalefBegin) ||
810 (((options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_AUTO )
811 && (shapeVars.spacesRelativeToTextBeginEnd==1)) ) {
812 lamAlefOption = 1;
813 }
814 if ( (options&U_SHAPE_TASHKEEL_MASK) == shapeVars.uShapeTashkeelBegin ) {
815 tashkeelOption = 1;
816 }
817 }
818
819 if(lamAlefOption || tashkeelOption){
820 uprv_memset(tempbuffer, 0, (sourceLength+1)*U_SIZEOF_UCHAR);
821
822 i = j = sourceLength; count = 0;
823
824 while(i >= 0) {
825 if ( (lamAlefOption && dest[i] == LAMALEF_SPACE_SUB) ||
826 (tashkeelOption && dest[i] == TASHKEEL_SPACE_SUB) ){
827 j++;
828 count++;
829 }else {
830 tempbuffer[j] = dest[i];
831 }
832 i--;
833 j--;
834 }
835
836 for(i=0 ;i < count; i++){
837 tempbuffer[i] = SPACE_CHAR;
838 }
839
840 u_memcpy(dest, tempbuffer, sourceLength);
841 destSize = sourceLength;
842 }
843
844
845
846 lamAlefOption = 0;
847 tashkeelOption = 0;
848
849 if (shapingMode == 0) {
850 if ( ((options&U_SHAPE_LAMALEF_MASK) == shapeVars.uShapeLamalefEnd) ||
851 (((options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_AUTO )
852 && (shapeVars.spacesRelativeToTextBeginEnd==0)) ) {
853 lamAlefOption = 1;
854 }
855 if ( (options&U_SHAPE_TASHKEEL_MASK) == shapeVars.uShapeTashkeelEnd ){
856 tashkeelOption = 1;
857 }
858 }
859
860 if(lamAlefOption || tashkeelOption){
861 uprv_memset(tempbuffer, 0, (sourceLength+1)*U_SIZEOF_UCHAR);
862
863 i = j = 0; count = 0;
864 while(i < sourceLength) {
865 if ( (lamAlefOption && dest[i] == LAMALEF_SPACE_SUB) ||
866 (tashkeelOption && dest[i] == TASHKEEL_SPACE_SUB) ){
867 j--;
868 count++;
869 }else {
870 tempbuffer[j] = dest[i];
871 }
872 i++;
873 j++;
874 }
875
876 while(count >= 0) {
877 tempbuffer[i] = SPACE_CHAR;
878 i--;
879 count--;
880 }
881
882 u_memcpy(dest, tempbuffer, sourceLength);
883 destSize = sourceLength;
884 }
885
886
887 if(tempbuffer){
888 uprv_free(tempbuffer);
889 }
890
891 return destSize;
892 }
893
894 /*
895 *Name :expandCompositCharAtBegin
896 *Function :Expands the LamAlef character to Lam and Alef consuming the required
897 * space from beginning of the buffer. If the text type was visual_LTR
898 * and the option U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END was selected
899 * the spaces will be located at end of buffer.
900 * If there are no spaces to expand the LamAlef, an error
901 * will be set to U_NO_SPACE_AVAILABLE as defined in utypes.h
902 */
903
904 static int32_t
905 expandCompositCharAtBegin(UChar *dest, int32_t sourceLength, int32_t destSize,UErrorCode *pErrorCode) {
906 int32_t i = 0,j = 0;
907 int32_t countl = 0;
908 UChar *tempbuffer=NULL;
909
910 tempbuffer = (UChar *)uprv_malloc((sourceLength+1)*U_SIZEOF_UCHAR);
911
912 /* Test for NULL */
913 if(tempbuffer == NULL) {
914 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
915 return 0;
916 }
917
918 uprv_memset(tempbuffer, 0, (sourceLength+1)*U_SIZEOF_UCHAR);
919
920 i = 0;
921 while(dest[i] == SPACE_CHAR) {
922 countl++;
923 i++;
924 }
925
926 i = j = sourceLength-1;
927
928 while(i >= 0 && j >= 0) {
929 if( countl>0 && isLamAlefChar(dest[i])) {
930 tempbuffer[j] = LAM_CHAR;
931 /* to ensure the array index is within the range */
932 U_ASSERT(dest[i] >= 0xFEF5u
933 && dest[i]-0xFEF5u < UPRV_LENGTHOF(convertLamAlef));
934 tempbuffer[j-1] = convertLamAlef[ dest[i] - 0xFEF5 ];
935 j--;
936 countl--;
937 }else {
938 if( countl == 0 && isLamAlefChar(dest[i]) ) {
939 *pErrorCode=U_NO_SPACE_AVAILABLE;
940 }
941 tempbuffer[j] = dest[i];
942 }
943 i--;
944 j--;
945 }
946 u_memcpy(dest, tempbuffer, sourceLength);
947
948 uprv_free(tempbuffer);
949
950 destSize = sourceLength;
951 return destSize;
952 }
953
954 /*
955 *Name : expandCompositCharAtEnd
956 *Function : Expands the LamAlef character to Lam and Alef consuming the
957 * required space from end of the buffer. If the text type was
958 * Visual LTR and the option U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END
959 * was used, the spaces will be consumed from begin of buffer. If
960 * there are no spaces to expand the LamAlef, an error
961 * will be set to U_NO_SPACE_AVAILABLE as defined in utypes.h
962 */
963
964 static int32_t
965 expandCompositCharAtEnd(UChar *dest, int32_t sourceLength, int32_t destSize,UErrorCode *pErrorCode) {
966 int32_t i = 0,j = 0;
967
968 int32_t countr = 0;
969 int32_t inpsize = sourceLength;
970
971 UChar *tempbuffer=NULL;
972 tempbuffer = (UChar *)uprv_malloc((sourceLength+1)*U_SIZEOF_UCHAR);
973
974 /* Test for NULL */
975 if(tempbuffer == NULL) {
976 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
977 return 0;
978 }
979
980 uprv_memset(tempbuffer, 0, (sourceLength+1)*U_SIZEOF_UCHAR);
981
982 while(dest[inpsize-1] == SPACE_CHAR) {
983 countr++;
984 inpsize--;
985 }
986
987 i = sourceLength - countr - 1;
988 j = sourceLength - 1;
989
990 while(i >= 0 && j >= 0) {
991 if( countr>0 && isLamAlefChar(dest[i]) ) {
992 tempbuffer[j] = LAM_CHAR;
993 tempbuffer[j-1] = convertLamAlef[ dest[i] - 0xFEF5 ];
994 j--;
995 countr--;
996 }else {
997 if ((countr == 0) && isLamAlefChar(dest[i]) ) {
998 *pErrorCode=U_NO_SPACE_AVAILABLE;
999 }
1000 tempbuffer[j] = dest[i];
1001 }
1002 i--;
1003 j--;
1004 }
1005
1006 if(countr > 0) {
1007 u_memmove(tempbuffer, tempbuffer+countr, sourceLength);
1008 if(u_strlen(tempbuffer) < sourceLength) {
1009 for(i=sourceLength-1;i>=sourceLength-countr;i--) {
1010 tempbuffer[i] = SPACE_CHAR;
1011 }
1012 }
1013 }
1014 u_memcpy(dest, tempbuffer, sourceLength);
1015
1016 uprv_free(tempbuffer);
1017
1018 destSize = sourceLength;
1019 return destSize;
1020 }
1021
1022 /*
1023 *Name : expandCompositCharAtNear
1024 *Function : Expands the LamAlef character into Lam + Alef, YehHamza character
1025 * into Yeh + Hamza, SeenFamily character into SeenFamily character
1026 * + Tail, while consuming the space next to the character.
1027 * If there are no spaces next to the character, an error
1028 * will be set to U_NO_SPACE_AVAILABLE as defined in utypes.h
1029 */
1030
1031 static int32_t
1032 expandCompositCharAtNear(UChar *dest, int32_t sourceLength, int32_t destSize,UErrorCode *pErrorCode,
1033 int yehHamzaOption, int seenTailOption, int lamAlefOption, struct uShapeVariables shapeVars) {
1034 int32_t i = 0;
1035
1036
1037 UChar lamalefChar, yehhamzaChar;
1038
1039 for(i = 0 ;i<=sourceLength-1;i++) {
1040 if (seenTailOption && isSeenTailFamilyChar(dest[i])) {
1041 if ((i>0) && (dest[i-1] == SPACE_CHAR) ) {
1042 dest[i-1] = shapeVars.tailChar;
1043 }else {
1044 *pErrorCode=U_NO_SPACE_AVAILABLE;
1045 }
1046 }else if(yehHamzaOption && (isYehHamzaChar(dest[i])) ) {
1047 if ((i>0) && (dest[i-1] == SPACE_CHAR) ) {
1048 yehhamzaChar = dest[i];
1049 dest[i] = yehHamzaToYeh[yehhamzaChar - YEH_HAMZAFE_CHAR];
1050 dest[i-1] = HAMZAFE_CHAR;
1051 }else {
1052
1053 *pErrorCode=U_NO_SPACE_AVAILABLE;
1054 }
1055 }else if(lamAlefOption && isLamAlefChar(dest[i+1])) {
1056 if(dest[i] == SPACE_CHAR){
1057 lamalefChar = dest[i+1];
1058 dest[i+1] = LAM_CHAR;
1059 dest[i] = convertLamAlef[ lamalefChar - 0xFEF5 ];
1060 }else {
1061 *pErrorCode=U_NO_SPACE_AVAILABLE;
1062 }
1063 }
1064 }
1065 destSize = sourceLength;
1066 return destSize;
1067 }
1068 /*
1069 * Name : expandCompositChar
1070 * Function : LamAlef, need special handling, since it expands from one
1071 * character into two characters while shaping or deshaping.
1072 * In order to expand it, near or far spaces according to the
1073 * options user specifies. Also buffer size can be increased.
1074 *
1075 * For SeenFamily characters and YehHamza only the near option is
1076 * supported, while for LamAlef we can take spaces from begin, end,
1077 * near or even increase the buffer size.
1078 * There is also the Auto option for LamAlef only, which will first
1079 * search for a space at end, begin then near, respectively.
1080 * If there are no spaces to expand these characters, an error will be set to
1081 * U_NO_SPACE_AVAILABLE as defined in utypes.h
1082 */
1083
1084 static int32_t
1085 expandCompositChar(UChar *dest, int32_t sourceLength,
1086 int32_t destSize,uint32_t options,
1087 UErrorCode *pErrorCode, int shapingMode,struct uShapeVariables shapeVars) {
1088
1089 int32_t i = 0,j = 0;
1090
1091 UChar *tempbuffer=NULL;
1092 int yehHamzaOption = 0;
1093 int seenTailOption = 0;
1094 int lamAlefOption = 0;
1095
1096 if (shapingMode == 1){
1097 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_AUTO){
1098
1099 if(shapeVars.spacesRelativeToTextBeginEnd == 0) {
1100 destSize = expandCompositCharAtEnd(dest, sourceLength, destSize, pErrorCode);
1101
1102 if(*pErrorCode == U_NO_SPACE_AVAILABLE) {
1103 *pErrorCode = U_ZERO_ERROR;
1104 destSize = expandCompositCharAtBegin(dest, sourceLength, destSize, pErrorCode);
1105 }
1106 }else {
1107 destSize = expandCompositCharAtBegin(dest, sourceLength, destSize, pErrorCode);
1108
1109 if(*pErrorCode == U_NO_SPACE_AVAILABLE) {
1110 *pErrorCode = U_ZERO_ERROR;
1111 destSize = expandCompositCharAtEnd(dest, sourceLength, destSize, pErrorCode);
1112 }
1113 }
1114
1115 if(*pErrorCode == U_NO_SPACE_AVAILABLE) {
1116 *pErrorCode = U_ZERO_ERROR;
1117 destSize = expandCompositCharAtNear(dest, sourceLength, destSize, pErrorCode, yehHamzaOption,
1118 seenTailOption, 1,shapeVars);
1119 }
1120 }
1121 }
1122
1123 if (shapingMode == 1){
1124 if ( (options&U_SHAPE_LAMALEF_MASK) == shapeVars.uShapeLamalefEnd){
1125 destSize = expandCompositCharAtEnd(dest, sourceLength, destSize, pErrorCode);
1126 }
1127 }
1128
1129 if (shapingMode == 1){
1130 if ( (options&U_SHAPE_LAMALEF_MASK) == shapeVars.uShapeLamalefBegin){
1131 destSize = expandCompositCharAtBegin(dest, sourceLength, destSize, pErrorCode);
1132 }
1133 }
1134
1135 if (shapingMode == 0){
1136 if ((options&U_SHAPE_YEHHAMZA_MASK) == U_SHAPE_YEHHAMZA_TWOCELL_NEAR){
1137 yehHamzaOption = 1;
1138 }
1139 if ((options&U_SHAPE_SEEN_MASK) == U_SHAPE_SEEN_TWOCELL_NEAR){
1140 seenTailOption = 1;
1141 }
1142 }
1143 if (shapingMode == 1) {
1144 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_NEAR) {
1145 lamAlefOption = 1;
1146 }
1147 }
1148
1149
1150 if (yehHamzaOption || seenTailOption || lamAlefOption){
1151 destSize = expandCompositCharAtNear(dest, sourceLength, destSize, pErrorCode, yehHamzaOption,
1152 seenTailOption,lamAlefOption,shapeVars);
1153 }
1154
1155
1156 if (shapingMode == 1){
1157 if ( (options&U_SHAPE_LAMALEF_MASK) == U_SHAPE_LAMALEF_RESIZE){
1158 destSize = calculateSize(dest,sourceLength,destSize,options);
1159 tempbuffer = (UChar *)uprv_malloc((destSize+1)*U_SIZEOF_UCHAR);
1160
1161 /* Test for NULL */
1162 if(tempbuffer == NULL) {
1163 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
1164 return 0;
1165 }
1166
1167 uprv_memset(tempbuffer, 0, (destSize+1)*U_SIZEOF_UCHAR);
1168
1169 i = j = 0;
1170 while(i < destSize && j < destSize) {
1171 if(isLamAlefChar(dest[i]) ) {
1172 tempbuffer[j] = convertLamAlef[ dest[i] - 0xFEF5 ];
1173 tempbuffer[j+1] = LAM_CHAR;
1174 j++;
1175 }else {
1176 tempbuffer[j] = dest[i];
1177 }
1178 i++;
1179 j++;
1180 }
1181
1182 u_memcpy(dest, tempbuffer, destSize);
1183 }
1184 }
1185
1186 if(tempbuffer) {
1187 uprv_free(tempbuffer);
1188 }
1189 return destSize;
1190 }
1191
1192 /*
1193 *Name : shapeUnicode
1194 *Function : Converts an Arabic Unicode buffer in 06xx Range into a shaped
1195 * arabic Unicode buffer in FExx Range
1196 */
1197 static int32_t
1198 shapeUnicode(UChar *dest, int32_t sourceLength,
1199 int32_t destSize,uint32_t options,
1200 UErrorCode *pErrorCode,
1201 int tashkeelFlag, struct uShapeVariables shapeVars) {
1202
1203 int32_t i, iend;
1204 int32_t step;
1205 int32_t lastPos,Nx, Nw;
1206 unsigned int Shape;
1207 int32_t lamalef_found = 0;
1208 int32_t seenfamFound = 0, yehhamzaFound =0, tashkeelFound = 0;
1209 UChar prevLink = 0, lastLink = 0, currLink, nextLink = 0;
1210 UChar wLamalef;
1211
1212 /*
1213 * Converts the input buffer from FExx Range into 06xx Range
1214 * to make sure that all characters are in the 06xx range
1215 * even the lamalef is converted to the special region in
1216 * the 06xx range
1217 */
1218 if ((options & U_SHAPE_PRESERVE_PRESENTATION_MASK) == U_SHAPE_PRESERVE_PRESENTATION_NOOP) {
1219 for (i = 0; i < sourceLength; i++) {
1220 UChar inputChar = dest[i];
1221 if ( (inputChar >= 0xFB50) && (inputChar <= 0xFBFF)) {
1222 UChar c = convertFBto06 [ (inputChar - 0xFB50) ];
1223 if (c != 0)
1224 dest[i] = c;
1225 } else if ( (inputChar >= 0xFE70) && (inputChar <= 0xFEFC)) {
1226 dest[i] = convertFEto06 [ (inputChar - 0xFE70) ] ;
1227 } else {
1228 dest[i] = inputChar ;
1229 }
1230 }
1231 }
1232
1233
1234 /* sets the index to the end of the buffer, together with the step point to -1 */
1235 i = sourceLength - 1;
1236 iend = -1;
1237 step = -1;
1238
1239 /*
1240 * This function resolves the link between the characters .
1241 * Arabic characters have four forms :
1242 * Isolated Form, Initial Form, Middle Form and Final Form
1243 */
1244 currLink = getLink(dest[i]);
1245
1246 lastPos = i;
1247 Nx = -2, Nw = 0;
1248
1249 while (i != iend) {
1250 /* If high byte of currLink > 0 then more than one shape */
1251 if ((currLink & 0xFF00) > 0 || (getLink(dest[i]) & IRRELEVANT) != 0) {
1252 Nw = i + step;
1253 while (Nx < 0) { /* we need to know about next char */
1254 if(Nw == iend) {
1255 nextLink = 0;
1256 Nx = 3000;
1257 } else {
1258 nextLink = getLink(dest[Nw]);
1259 if((nextLink & IRRELEVANT) == 0) {
1260 Nx = Nw;
1261 } else {
1262 Nw = Nw + step;
1263 }
1264 }
1265 }
1266
1267 if ( ((currLink & ALEFTYPE) > 0) && ((lastLink & LAMTYPE) > 0) ) {
1268 lamalef_found = 1;
1269 wLamalef = changeLamAlef(dest[i]); /*get from 0x065C-0x065f */
1270 if ( wLamalef != 0) {
1271 dest[i] = LAMALEF_SPACE_SUB; /* The default case is to drop the Alef and replace */
1272 dest[lastPos] =wLamalef; /* it by LAMALEF_SPACE_SUB which is the last character in the */
1273 i=lastPos; /* unicode private use area, this is done to make */
1274 } /* sure that removeLamAlefSpaces() handles only the */
1275 lastLink = prevLink; /* spaces generated during lamalef generation. */
1276 currLink = getLink(wLamalef); /* LAMALEF_SPACE_SUB is added here and is replaced by spaces */
1277 } /* in removeLamAlefSpaces() */
1278
1279 if ((i > 0) && (dest[i-1] == SPACE_CHAR)){
1280 if ( isSeenFamilyChar(dest[i])) {
1281 seenfamFound = 1;
1282 } else if (dest[i] == YEH_HAMZA_CHAR) {
1283 yehhamzaFound = 1;
1284 }
1285 }
1286 else if(i==0){
1287 if ( isSeenFamilyChar(dest[i])){
1288 seenfamFound = 1;
1289 } else if (dest[i] == YEH_HAMZA_CHAR) {
1290 yehhamzaFound = 1;
1291 }
1292 }
1293
1294 /*
1295 * get the proper shape according to link ability of neighbors
1296 * and of character; depends on the order of the shapes
1297 * (isolated, initial, middle, final) in the compatibility area
1298 */
1299 Shape = shapeTable[nextLink & (LINKR + LINKL)]
1300 [lastLink & (LINKR + LINKL)]
1301 [currLink & (LINKR + LINKL)];
1302
1303 if ((currLink & (LINKR+LINKL)) == 1) {
1304 Shape &= 1;
1305 } else if(isTashkeelChar(dest[i])) {
1306 if( (lastLink & LINKL) && (nextLink & LINKR) && (tashkeelFlag == 1) &&
1307 dest[i] != 0x064C && dest[i] != 0x064D )
1308 {
1309 Shape = 1;
1310 if( (nextLink&ALEFTYPE) == ALEFTYPE && (lastLink&LAMTYPE) == LAMTYPE ) {
1311 Shape = 0;
1312 }
1313 } else if(tashkeelFlag == 2 && dest[i] == SHADDA06_CHAR){
1314 Shape = 1;
1315 } else {
1316 Shape = 0;
1317 }
1318 }
1319 if ((dest[i] ^ 0x0600) < 0x100) {
1320 if ( isTashkeelChar(dest[i]) ){
1321 if (tashkeelFlag == 2 && dest[i] != SHADDA06_CHAR){
1322 dest[i] = TASHKEEL_SPACE_SUB;
1323 tashkeelFound = 1;
1324 } else {
1325 /* to ensure the array index is within the range */
1326 U_ASSERT(dest[i] >= 0x064Bu
1327 && dest[i]-0x064Bu < UPRV_LENGTHOF(IrrelevantPos));
1328 dest[i] = 0xFE70 + IrrelevantPos[(dest[i] - 0x064B)] + Shape;
1329 }
1330 }else if ((currLink & APRESENT) > 0) {
1331 dest[i] = (UChar)(0xFB50 + (currLink >> 8) + Shape);
1332 }else if ((currLink >> 8) > 0 && (currLink & IRRELEVANT) == 0) {
1333 dest[i] = (UChar)(0xFE70 + (currLink >> 8) + Shape);
1334 }
1335 }
1336 }
1337
1338 /* move one notch forward */
1339 if ((currLink & IRRELEVANT) == 0) {
1340 prevLink = lastLink;
1341 lastLink = currLink;
1342 lastPos = i;
1343 }
1344
1345 i = i + step;
1346 if (i == Nx) {
1347 currLink = nextLink;
1348 Nx = -2;
1349 } else if(i != iend) {
1350 currLink = getLink(dest[i]);
1351 }
1352 }
1353 destSize = sourceLength;
1354 if ( (lamalef_found != 0 ) || (tashkeelFound != 0) ){
1355 destSize = handleGeneratedSpaces(dest,sourceLength,destSize,options,pErrorCode, shapeVars);
1356 }
1357
1358 if ( (seenfamFound != 0) || (yehhamzaFound != 0) ) {
1359 destSize = expandCompositChar(dest, sourceLength,destSize,options,pErrorCode, SHAPE_MODE,shapeVars);
1360 }
1361 return destSize;
1362 }
1363
1364 /*
1365 *Name : deShapeUnicode
1366 *Function : Converts an Arabic Unicode buffer in FExx Range into unshaped
1367 * arabic Unicode buffer in 06xx Range
1368 */
1369 static int32_t
1370 deShapeUnicode(UChar *dest, int32_t sourceLength,
1371 int32_t destSize,uint32_t options,
1372 UErrorCode *pErrorCode, struct uShapeVariables shapeVars) {
1373 int32_t i = 0;
1374 int32_t lamalef_found = 0;
1375 int32_t yehHamzaComposeEnabled = 0;
1376 int32_t seenComposeEnabled = 0;
1377
1378 yehHamzaComposeEnabled = ((options&U_SHAPE_YEHHAMZA_MASK) == U_SHAPE_YEHHAMZA_TWOCELL_NEAR) ? 1 : 0;
1379 seenComposeEnabled = ((options&U_SHAPE_SEEN_MASK) == U_SHAPE_SEEN_TWOCELL_NEAR)? 1 : 0;
1380
1381 /*
1382 *This for loop changes the buffer from the Unicode FE range to
1383 *the Unicode 06 range
1384 */
1385
1386 for(i = 0; i < sourceLength; i++) {
1387 UChar inputChar = dest[i];
1388 if ( (inputChar >= 0xFB50) && (inputChar <= 0xFBFF)) { /* FBxx Arabic range */
1389 UChar c = convertFBto06 [ (inputChar - 0xFB50) ];
1390 if (c != 0)
1391 dest[i] = c;
1392 } else if( (yehHamzaComposeEnabled == 1) && ((inputChar == HAMZA06_CHAR) || (inputChar == HAMZAFE_CHAR))
1393 && (i < (sourceLength - 1)) && isAlefMaksouraChar(dest[i+1] )) {
1394 dest[i] = SPACE_CHAR;
1395 dest[i+1] = YEH_HAMZA_CHAR;
1396 } else if ( (seenComposeEnabled == 1) && (isTailChar(inputChar)) && (i< (sourceLength - 1))
1397 && (isSeenTailFamilyChar(dest[i+1])) ) {
1398 dest[i] = SPACE_CHAR;
1399 } else if (( inputChar >= 0xFE70) && (inputChar <= 0xFEF4 )) { /* FExx Arabic range */
1400 dest[i] = convertFEto06 [ (inputChar - 0xFE70) ];
1401 } else {
1402 dest[i] = inputChar ;
1403 }
1404
1405 if( isLamAlefChar(dest[i]) )
1406 lamalef_found = 1;
1407 }
1408
1409 destSize = sourceLength;
1410 if (lamalef_found != 0){
1411 destSize = expandCompositChar(dest,sourceLength,destSize,options,pErrorCode,DESHAPE_MODE, shapeVars);
1412 }
1413 return destSize;
1414 }
1415
1416 /*
1417 ****************************************
1418 * u_shapeArabic
1419 ****************************************
1420 */
1421
1422 U_CAPI int32_t U_EXPORT2
1423 u_shapeArabic(const UChar *source, int32_t sourceLength,
1424 UChar *dest, int32_t destCapacity,
1425 uint32_t options,
1426 UErrorCode *pErrorCode) {
1427
1428 int32_t destLength;
1429 struct uShapeVariables shapeVars = { OLD_TAIL_CHAR,U_SHAPE_LAMALEF_BEGIN,U_SHAPE_LAMALEF_END,U_SHAPE_TASHKEEL_BEGIN,U_SHAPE_TASHKEEL_END,0};
1430
1431 /* usual error checking */
1432 if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
1433 return 0;
1434 }
1435
1436 /* make sure that no reserved options values are used; allow dest==NULL only for preflighting */
1437 if( source==NULL || sourceLength<-1 || (dest==NULL && destCapacity!=0) || destCapacity<0 ||
1438 (((options&U_SHAPE_TASHKEEL_MASK) > 0) &&
1439 ((options&U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED) == U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED) ) ||
1440 (((options&U_SHAPE_TASHKEEL_MASK) > 0) &&
1441 ((options&U_SHAPE_LETTERS_MASK) == U_SHAPE_LETTERS_UNSHAPE)) ||
1442 (options&U_SHAPE_DIGIT_TYPE_RESERVED)==U_SHAPE_DIGIT_TYPE_RESERVED ||
1443 (options&U_SHAPE_DIGITS_MASK)==U_SHAPE_DIGITS_RESERVED ||
1444 ((options&U_SHAPE_LAMALEF_MASK) != U_SHAPE_LAMALEF_RESIZE &&
1445 (options&U_SHAPE_AGGREGATE_TASHKEEL_MASK) != 0) ||
1446 ((options&U_SHAPE_AGGREGATE_TASHKEEL_MASK) == U_SHAPE_AGGREGATE_TASHKEEL &&
1447 (options&U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED) != U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED)
1448 )
1449 {
1450 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1451 return 0;
1452 }
1453 /* Validate lamalef options */
1454 if(((options&U_SHAPE_LAMALEF_MASK) > 0)&&
1455 !(((options & U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_BEGIN) ||
1456 ((options & U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_END ) ||
1457 ((options & U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_RESIZE )||
1458 ((options & U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_AUTO) ||
1459 ((options & U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_NEAR)))
1460 {
1461 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1462 return 0;
1463 }
1464 /* Validate Tashkeel options */
1465 if(((options&U_SHAPE_TASHKEEL_MASK) > 0)&&
1466 !(((options & U_SHAPE_TASHKEEL_MASK)==U_SHAPE_TASHKEEL_BEGIN) ||
1467 ((options & U_SHAPE_TASHKEEL_MASK)==U_SHAPE_TASHKEEL_END )
1468 ||((options & U_SHAPE_TASHKEEL_MASK)==U_SHAPE_TASHKEEL_RESIZE )||
1469 ((options & U_SHAPE_TASHKEEL_MASK)==U_SHAPE_TASHKEEL_REPLACE_BY_TATWEEL)))
1470 {
1471 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1472 return 0;
1473 }
1474 /* determine the source length */
1475 if(sourceLength==-1) {
1476 sourceLength=u_strlen(source);
1477 }
1478 if(sourceLength<=0) {
1479 return u_terminateUChars(dest, destCapacity, 0, pErrorCode);
1480 }
1481
1482 /* check that source and destination do not overlap */
1483 if( dest!=NULL &&
1484 ((source<=dest && dest<source+sourceLength) ||
1485 (dest<=source && source<dest+destCapacity))) {
1486 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1487 return 0;
1488 }
1489
1490 /* Does Options contain the new Seen Tail Unicode code point option */
1491 if ( (options&U_SHAPE_TAIL_TYPE_MASK) == U_SHAPE_TAIL_NEW_UNICODE){
1492 shapeVars.tailChar = NEW_TAIL_CHAR;
1493 }else {
1494 shapeVars.tailChar = OLD_TAIL_CHAR;
1495 }
1496
1497 if((options&U_SHAPE_LETTERS_MASK)!=U_SHAPE_LETTERS_NOOP) {
1498 UChar buffer[300];
1499 UChar *tempbuffer, *tempsource = NULL;
1500 int32_t outputSize, spacesCountl=0, spacesCountr=0;
1501
1502 if((options&U_SHAPE_AGGREGATE_TASHKEEL_MASK)>0) {
1503 int32_t logical_order = (options&U_SHAPE_TEXT_DIRECTION_MASK) == U_SHAPE_TEXT_DIRECTION_LOGICAL;
1504 int32_t aggregate_tashkeel =
1505 (options&(U_SHAPE_AGGREGATE_TASHKEEL_MASK+U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED)) ==
1506 (U_SHAPE_AGGREGATE_TASHKEEL+U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED);
1507 int step=logical_order?1:-1;
1508 int j=logical_order?-1:2*sourceLength;
1509 int i=logical_order?-1:sourceLength;
1510 int end=logical_order?sourceLength:-1;
1511 int aggregation_possible = 1;
1512 UChar prev = 0;
1513 UChar prevLink, currLink = 0;
1514 int newSourceLength = 0;
1515 tempsource = (UChar *)uprv_malloc(2*sourceLength*U_SIZEOF_UCHAR);
1516 if(tempsource == NULL) {
1517 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
1518 return 0;
1519 }
1520
1521 while ((i+=step) != end) {
1522 prevLink = currLink;
1523 currLink = getLink(source[i]);
1524 if (aggregate_tashkeel && ((prevLink|currLink)&COMBINE) == COMBINE && aggregation_possible) {
1525 aggregation_possible = 0;
1526 tempsource[j] = (prev<source[i]?prev:source[i])-0x064C+0xFC5E;
1527 currLink = getLink(tempsource[j]);
1528 } else {
1529 aggregation_possible = 1;
1530 tempsource[j+=step] = source[i];
1531 prev = source[i];
1532 newSourceLength++;
1533 }
1534 }
1535 source = tempsource+(logical_order?0:j);
1536 sourceLength = newSourceLength;
1537 }
1538
1539 /* calculate destination size */
1540 /* TODO: do we ever need to do this pure preflighting? */
1541 if(((options&U_SHAPE_LAMALEF_MASK)==U_SHAPE_LAMALEF_RESIZE) ||
1542 ((options&U_SHAPE_TASHKEEL_MASK)==U_SHAPE_TASHKEEL_RESIZE)) {
1543 outputSize=calculateSize(source,sourceLength,destCapacity,options);
1544 } else {
1545 outputSize=sourceLength;
1546 }
1547
1548 if(outputSize>destCapacity) {
1549 *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
1550 if (tempsource != NULL) uprv_free(tempsource);
1551 return outputSize;
1552 }
1553
1554 /*
1555 * need a temporary buffer of size max(outputSize, sourceLength)
1556 * because at first we copy source->temp
1557 */
1558 if(sourceLength>outputSize) {
1559 outputSize=sourceLength;
1560 }
1561
1562 /* Start of Arabic letter shaping part */
1563 if(outputSize<=UPRV_LENGTHOF(buffer)) {
1564 outputSize=UPRV_LENGTHOF(buffer);
1565 tempbuffer=buffer;
1566 } else {
1567 tempbuffer = (UChar *)uprv_malloc(outputSize*U_SIZEOF_UCHAR);
1568
1569 /*Test for NULL*/
1570 if(tempbuffer == NULL) {
1571 *pErrorCode = U_MEMORY_ALLOCATION_ERROR;
1572 if (tempsource != NULL) uprv_free(tempsource);
1573 return 0;
1574 }
1575 }
1576 u_memcpy(tempbuffer, source, sourceLength);
1577 if (tempsource != NULL){
1578 uprv_free(tempsource);
1579 }
1580
1581 if(sourceLength<outputSize) {
1582 uprv_memset(tempbuffer+sourceLength, 0, (outputSize-sourceLength)*U_SIZEOF_UCHAR);
1583 }
1584
1585 if((options&U_SHAPE_TEXT_DIRECTION_MASK) == U_SHAPE_TEXT_DIRECTION_LOGICAL) {
1586 countSpaces(tempbuffer,sourceLength,options,&spacesCountl,&spacesCountr);
1587 invertBuffer(tempbuffer,sourceLength,options,spacesCountl,spacesCountr);
1588 }
1589
1590 if((options&U_SHAPE_TEXT_DIRECTION_MASK) == U_SHAPE_TEXT_DIRECTION_VISUAL_LTR) {
1591 if((options&U_SHAPE_SPACES_RELATIVE_TO_TEXT_MASK) == U_SHAPE_SPACES_RELATIVE_TO_TEXT_BEGIN_END) {
1592 shapeVars.spacesRelativeToTextBeginEnd = 1;
1593 shapeVars.uShapeLamalefBegin = U_SHAPE_LAMALEF_END;
1594 shapeVars.uShapeLamalefEnd = U_SHAPE_LAMALEF_BEGIN;
1595 shapeVars.uShapeTashkeelBegin = U_SHAPE_TASHKEEL_END;
1596 shapeVars.uShapeTashkeelEnd = U_SHAPE_TASHKEEL_BEGIN;
1597 }
1598 }
1599
1600 switch(options&U_SHAPE_LETTERS_MASK) {
1601 case U_SHAPE_LETTERS_SHAPE :
1602 if( (options&U_SHAPE_TASHKEEL_MASK)> 0
1603 && ((options&U_SHAPE_TASHKEEL_MASK) !=U_SHAPE_TASHKEEL_REPLACE_BY_TATWEEL)) {
1604 /* Call the shaping function with tashkeel flag == 2 for removal of tashkeel */
1605 destLength = shapeUnicode(tempbuffer,sourceLength,destCapacity,options,pErrorCode,2,shapeVars);
1606 }else {
1607 /* default Call the shaping function with tashkeel flag == 1 */
1608 destLength = shapeUnicode(tempbuffer,sourceLength,destCapacity,options,pErrorCode,1,shapeVars);
1609
1610 /*After shaping text check if user wants to remove tashkeel and replace it with tatweel*/
1611 if( (options&U_SHAPE_TASHKEEL_MASK) == U_SHAPE_TASHKEEL_REPLACE_BY_TATWEEL){
1612 destLength = handleTashkeelWithTatweel(tempbuffer,destLength,destCapacity,options,pErrorCode);
1613 }
1614 }
1615 break;
1616 case U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED :
1617 /* Call the shaping function with tashkeel flag == 0 */
1618 destLength = shapeUnicode(tempbuffer,sourceLength,destCapacity,options,pErrorCode,0,shapeVars);
1619 break;
1620
1621 case U_SHAPE_LETTERS_UNSHAPE :
1622 /* Call the deshaping function */
1623 destLength = deShapeUnicode(tempbuffer,sourceLength,destCapacity,options,pErrorCode,shapeVars);
1624 break;
1625 default :
1626 /* will never occur because of validity checks above */
1627 destLength = 0;
1628 break;
1629 }
1630
1631 /*
1632 * TODO: (markus 2002aug01)
1633 * For as long as we always preflight the outputSize above
1634 * we should U_ASSERT(outputSize==destLength)
1635 * except for the adjustment above before the tempbuffer allocation
1636 */
1637
1638 if((options&U_SHAPE_TEXT_DIRECTION_MASK) == U_SHAPE_TEXT_DIRECTION_LOGICAL) {
1639 countSpaces(tempbuffer,destLength,options,&spacesCountl,&spacesCountr);
1640 invertBuffer(tempbuffer,destLength,options,spacesCountl,spacesCountr);
1641 }
1642 u_memcpy(dest, tempbuffer, uprv_min(destLength, destCapacity));
1643
1644 if(tempbuffer!=buffer) {
1645 uprv_free(tempbuffer);
1646 }
1647
1648 if(destLength>destCapacity) {
1649 *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
1650 return destLength;
1651 }
1652
1653 /* End of Arabic letter shaping part */
1654 } else {
1655 /*
1656 * No letter shaping:
1657 * just make sure the destination is large enough and copy the string.
1658 */
1659 if(destCapacity<sourceLength) {
1660 /* this catches preflighting, too */
1661 *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
1662 return sourceLength;
1663 }
1664 u_memcpy(dest, source, sourceLength);
1665 destLength=sourceLength;
1666 }
1667
1668 /*
1669 * Perform number shaping.
1670 * With UTF-16 or UTF-32, the length of the string is constant.
1671 * The easiest way to do this is to operate on the destination and
1672 * "shape" the digits in-place.
1673 */
1674 if((options&U_SHAPE_DIGITS_MASK)!=U_SHAPE_DIGITS_NOOP) {
1675 UChar digitBase;
1676 int32_t i;
1677
1678 /* select the requested digit group */
1679 switch(options&U_SHAPE_DIGIT_TYPE_MASK) {
1680 case U_SHAPE_DIGIT_TYPE_AN:
1681 digitBase=0x660; /* Unicode: "Arabic-Indic digits" */
1682 break;
1683 case U_SHAPE_DIGIT_TYPE_AN_EXTENDED:
1684 digitBase=0x6f0; /* Unicode: "Eastern Arabic-Indic digits (Persian and Urdu)" */
1685 break;
1686 default:
1687 /* will never occur because of validity checks above */
1688 digitBase=0;
1689 break;
1690 }
1691
1692 /* perform the requested operation */
1693 switch(options&U_SHAPE_DIGITS_MASK) {
1694 case U_SHAPE_DIGITS_EN2AN:
1695 /* add (digitBase-'0') to each European (ASCII) digit code point */
1696 digitBase-=0x30;
1697 for(i=0; i<destLength; ++i) {
1698 if(((uint32_t)dest[i]-0x30)<10) {
1699 dest[i]+=digitBase;
1700 }
1701 }
1702 break;
1703 case U_SHAPE_DIGITS_AN2EN:
1704 /* subtract (digitBase-'0') from each Arabic digit code point */
1705 for(i=0; i<destLength; ++i) {
1706 if(((uint32_t)dest[i]-(uint32_t)digitBase)<10) {
1707 dest[i]-=digitBase-0x30;
1708 }
1709 }
1710 break;
1711 case U_SHAPE_DIGITS_ALEN2AN_INIT_LR:
1712 _shapeToArabicDigitsWithContext(dest, destLength,
1713 digitBase,
1714 (UBool)((options&U_SHAPE_TEXT_DIRECTION_MASK)==U_SHAPE_TEXT_DIRECTION_LOGICAL),
1715 FALSE);
1716 break;
1717 case U_SHAPE_DIGITS_ALEN2AN_INIT_AL:
1718 _shapeToArabicDigitsWithContext(dest, destLength,
1719 digitBase,
1720 (UBool)((options&U_SHAPE_TEXT_DIRECTION_MASK)==U_SHAPE_TEXT_DIRECTION_LOGICAL),
1721 TRUE);
1722 break;
1723 default:
1724 /* will never occur because of validity checks above */
1725 break;
1726 }
1727 }
1728
1729 return u_terminateUChars(dest, destCapacity, destLength, pErrorCode);
1730 }
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