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1 // Copyright (C) 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:   US-ASCII
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
_shapeToArabicDigitsWithContext(UChar * s,int32_t length,UChar digitBase,UBool isLogical,UBool lastStrongWasAL)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
invertBuffer(UChar * buffer,int32_t size,uint32_t,int32_t lowlimit,int32_t highlimit)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
changeLamAlef(UChar ch)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
getLink(UChar ch)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
countSpaces(UChar * dest,int32_t size,uint32_t,int32_t * spacesCountl,int32_t * spacesCountr)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
isTashkeelChar(UChar ch)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
isTashkeelCharFE(UChar ch)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
isAlefChar(UChar ch)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
isLamAlefChar(UChar ch)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
isTailChar(UChar ch)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
isSeenTailFamilyChar(UChar ch)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
isSeenFamilyChar(UChar ch)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
isAlefMaksouraChar(UChar ch)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
isYehHamzaChar(UChar ch)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
isTashkeelOnTatweelChar(UChar ch)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
isIsolatedTashkeelChar(UChar ch)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
calculateSize(const UChar * source,int32_t sourceLength,int32_t destSize,uint32_t options)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
handleTashkeelWithTatweel(UChar * dest,int32_t sourceLength,int32_t,uint32_t,UErrorCode *)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
handleGeneratedSpaces(UChar * dest,int32_t sourceLength,int32_t destSize,uint32_t options,UErrorCode * pErrorCode,struct uShapeVariables shapeVars)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
expandCompositCharAtBegin(UChar * dest,int32_t sourceLength,int32_t destSize,UErrorCode * pErrorCode)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
expandCompositCharAtEnd(UChar * dest,int32_t sourceLength,int32_t destSize,UErrorCode * pErrorCode)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
expandCompositCharAtNear(UChar * dest,int32_t sourceLength,int32_t destSize,UErrorCode * pErrorCode,int yehHamzaOption,int seenTailOption,int lamAlefOption,struct uShapeVariables shapeVars)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
expandCompositChar(UChar * dest,int32_t sourceLength,int32_t destSize,uint32_t options,UErrorCode * pErrorCode,int shapingMode,struct uShapeVariables shapeVars)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
shapeUnicode(UChar * dest,int32_t sourceLength,int32_t destSize,uint32_t options,UErrorCode * pErrorCode,int tashkeelFlag,struct uShapeVariables shapeVars)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
deShapeUnicode(UChar * dest,int32_t sourceLength,int32_t destSize,uint32_t options,UErrorCode * pErrorCode,struct uShapeVariables shapeVars)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
u_shapeArabic(const UChar * source,int32_t sourceLength,UChar * dest,int32_t destCapacity,uint32_t options,UErrorCode * pErrorCode)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 }
1731