又一个转换utf的程序
http://t1.minormatter.com/~ddunbar/clang-cov/ConvertUTF.c.html
/*===--- ConvertUTF.c - Universal Character Names conversions ---------------===
2 : *
3 : * The LLVM Compiler Infrastructure
4 : *
5 : * This file is distributed under the University of Illinois Open Source
6 : * License. See LICENSE.TXT for details.
7 : *
8 : *===------------------------------------------------------------------------=*/
9 : /*
10 : * Copyright 2001-2004 Unicode, Inc.
11 : *
12 : * Disclaimer
13 : *
14 : * This source code is provided as is by Unicode, Inc. No claims are
15 : * made as to fitness for any particular purpose. No warranties of any
16 : * kind are expressed or implied. The recipient agrees to determine
17 : * applicability of information provided. If this file has been
18 : * purchased on magnetic or optical media from Unicode, Inc., the
19 : * sole remedy for any claim will be exchange of defective media
20 : * within 90 days of receipt.
21 : *
22 : * Limitations on Rights to Redistribute This Code
23 : *
24 : * Unicode, Inc. hereby grants the right to freely use the information
25 : * supplied in this file in the creation of products supporting the
26 : * Unicode Standard, and to make copies of this file in any form
27 : * for internal or external distribution as long as this notice
28 : * remains attached.
29 : */
30 :
31 : /* ---------------------------------------------------------------------
32 :
33 : Conversions between UTF32, UTF-16, and UTF-8. Source code file.
34 : Author: Mark E. Davis, 1994.
35 : Rev History: Rick McGowan, fixes & updates May 2001.
36 : Sept 2001: fixed const & error conditions per
37 : mods suggested by S. Parent & A. Lillich.
38 : June 2002: Tim Dodd added detection and handling of incomplete
39 : source sequences, enhanced error detection, added casts
40 : to eliminate compiler warnings.
41 : July 2003: slight mods to back out aggressive FFFE detection.
42 : Jan 2004: updated switches in from-UTF8 conversions.
43 : Oct 2004: updated to use UNI_MAX_LEGAL_UTF32 in UTF-32 conversions.
44 :
45 : See the header file "ConvertUTF.h" for complete documentation.
46 :
47 : ------------------------------------------------------------------------ */
48 :
49 :
50 : #include "clang/Basic/ConvertUTF.h"
51 : #ifdef CVTUTF_DEBUG
52 : #include <stdio.h>
53 : #endif
54 :
55 : static const int halfShift = 10; /* used for shifting by 10 bits */
56 :
57 : static const UTF32 halfBase = 0x0010000UL;
58 : static const UTF32 halfMask = 0x3FFUL;
59 :
60 : #define UNI_SUR_HIGH_START (UTF32)0xD800
61 : #define UNI_SUR_HIGH_END (UTF32)0xDBFF
62 : #define UNI_SUR_LOW_START (UTF32)0xDC00
63 : #define UNI_SUR_LOW_END (UTF32)0xDFFF
64 : #define false 0
65 : #define true 1
66 :
67 : /* --------------------------------------------------------------------- */
68 :
69 : /*
70 : * Index into the table below with the first byte of a UTF-8 sequence to
71 : * get the number of trailing bytes that are supposed to follow it.
72 : * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
73 : * left as-is for anyone who may want to do such conversion, which was
74 : * allowed in earlier algorithms.
75 : */
76 : static const char trailingBytesForUTF8[256] = {
77 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
78 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
79 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
80 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
81 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
82 : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
83 : 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
84 : 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
85 : };
86 :
87 : /*
88 : * Magic values subtracted from a buffer value during UTF8 conversion.
89 : * This table contains as many values as there might be trailing bytes
90 : * in a UTF-8 sequence.
91 : */
92 : static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL,
93 : 0x03C82080UL, 0xFA082080UL, 0x82082080UL };
94 :
95 : /*
96 : * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
97 : * into the first byte, depending on how many bytes follow. There are
98 : * as many entries in this table as there are UTF-8 sequence types.
99 : * (I.e., one byte sequence, two byte... etc.). Remember that sequencs
100 : * for *legal* UTF-8 will be 4 or fewer bytes total.
101 : */
102 : static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
103 :
104 : /* --------------------------------------------------------------------- */
105 :
106 : /* The interface converts a whole buffer to avoid function-call overhead.
107 : * Constants have been gathered. Loops & conditionals have been removed as
108 : * much as possible for efficiency, in favor of drop-through switches.
109 : * (See "Note A" at the bottom of the file for equivalent code.)
110 : * If your compiler supports it, the "isLegalUTF8" call can be turned
111 : * into an inline function.
112 : */
113 :
114 : #ifdef CLANG_NEEDS_THESE_ONE_DAY
115 :
116 : /* --------------------------------------------------------------------- */
117 :
118 : ConversionResult ConvertUTF32toUTF16 (
119 : const UTF32** sourceStart, const UTF32* sourceEnd,
120 : UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
121 : ConversionResult result = conversionOK;
122 : const UTF32* source = *sourceStart;
123 : UTF16* target = *targetStart;
124 : while (source < sourceEnd) {
125 : UTF32 ch;
126 : if (target >= targetEnd) {
127 : result = targetExhausted; break;
128 : }
129 : ch = *source++;
130 : if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
131 : /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */
132 : if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
133 : if (flags == strictConversion) {
134 : --source; /* return to the illegal value itself */
135 : result = sourceIllegal;
136 : break;
137 : } else {
138 : *target++ = UNI_REPLACEMENT_CHAR;
139 : }
140 : } else {
141 : *target++ = (UTF16)ch; /* normal case */
142 : }
143 : } else if (ch > UNI_MAX_LEGAL_UTF32) {
144 : if (flags == strictConversion) {
145 : result = sourceIllegal;
146 : } else {
147 : *target++ = UNI_REPLACEMENT_CHAR;
148 : }
149 : } else {
150 : /* target is a character in range 0xFFFF - 0x10FFFF. */
151 : if (target + 1 >= targetEnd) {
152 : --source; /* Back up source pointer! */
153 : result = targetExhausted; break;
154 : }
155 : ch -= halfBase;
156 : *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
157 : *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
158 : }
159 : }
160 : *sourceStart = source;
161 : *targetStart = target;
162 : return result;
163 : }
164 :
165 : /* --------------------------------------------------------------------- */
166 :
167 : ConversionResult ConvertUTF16toUTF32 (
168 : const UTF16** sourceStart, const UTF16* sourceEnd,
169 : UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
170 : ConversionResult result = conversionOK;
171 : const UTF16* source = *sourceStart;
172 : UTF32* target = *targetStart;
173 : UTF32 ch, ch2;
174 : while (source < sourceEnd) {
175 : const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */
176 : ch = *source++;
177 : /* If we have a surrogate pair, convert to UTF32 first. */
178 : if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
179 : /* If the 16 bits following the high surrogate are in the source buffer... */
180 : if (source < sourceEnd) {
181 : ch2 = *source;
182 : /* If it's a low surrogate, convert to UTF32. */
183 : if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
184 : ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
185 : + (ch2 - UNI_SUR_LOW_START) + halfBase;
186 : ++source;
187 : } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
188 : --source; /* return to the illegal value itself */
189 : result = sourceIllegal;
190 : break;
191 : }
192 : } else { /* We don't have the 16 bits following the high surrogate. */
193 : --source; /* return to the high surrogate */
194 : result = sourceExhausted;
195 : break;
196 : }
197 : } else if (flags == strictConversion) {
198 : /* UTF-16 surrogate values are illegal in UTF-32 */
199 : if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
200 : --source; /* return to the illegal value itself */
201 : result = sourceIllegal;
202 : break;
203 : }
204 : }
205 : if (target >= targetEnd) {
206 : source = oldSource; /* Back up source pointer! */
207 : result = targetExhausted; break;
208 : }
209 : *target++ = ch;
210 : }
211 : *sourceStart = source;
212 : *targetStart = target;
213 : #ifdef CVTUTF_DEBUG
214 : if (result == sourceIllegal) {
215 : fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);
216 : fflush(stderr);
217 : }
218 : #endif
219 : return result;
220 : }
221 : ConversionResult ConvertUTF16toUTF8 (
222 : const UTF16** sourceStart, const UTF16* sourceEnd,
223 : UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
224 : ConversionResult result = conversionOK;
225 : const UTF16* source = *sourceStart;
226 : UTF8* target = *targetStart;
227 : while (source < sourceEnd) {
228 : UTF32 ch;
229 : unsigned short bytesToWrite = 0;
230 : const UTF32 byteMask = 0xBF;
231 : const UTF32 byteMark = 0x80;
232 : const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */
233 : ch = *source++;
234 : /* If we have a surrogate pair, convert to UTF32 first. */
235 : if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
236 : /* If the 16 bits following the high surrogate are in the source buffer... */
237 : if (source < sourceEnd) {
238 : UTF32 ch2 = *source;
239 : /* If it's a low surrogate, convert to UTF32. */
240 : if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
241 : ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
242 : + (ch2 - UNI_SUR_LOW_START) + halfBase;
243 : ++source;
244 : } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
245 : --source; /* return to the illegal value itself */
246 : result = sourceIllegal;
247 : break;
248 : }
249 : } else { /* We don't have the 16 bits following the high surrogate. */
250 : --source; /* return to the high surrogate */
251 : result = sourceExhausted;
252 : break;
253 : }
254 : } else if (flags == strictConversion) {
255 : /* UTF-16 surrogate values are illegal in UTF-32 */
256 : if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
257 : --source; /* return to the illegal value itself */
258 : result = sourceIllegal;
259 : break;
260 : }
261 : }
262 : /* Figure out how many bytes the result will require */
263 : if (ch < (UTF32)0x80) { bytesToWrite = 1;
264 : } else if (ch < (UTF32)0x800) { bytesToWrite = 2;
265 : } else if (ch < (UTF32)0x10000) { bytesToWrite = 3;
266 : } else if (ch < (UTF32)0x110000) { bytesToWrite = 4;
267 : } else { bytesToWrite = 3;
268 : ch = UNI_REPLACEMENT_CHAR;
269 : }
270 :
271 : target += bytesToWrite;
272 : if (target > targetEnd) {
273 : source = oldSource; /* Back up source pointer! */
274 : target -= bytesToWrite; result = targetExhausted; break;
275 : }
276 : switch (bytesToWrite) { /* note: everything falls through. */
277 : case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
278 : case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
279 : case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
280 : case 1: *--target = (UTF8)(ch | firstByteMark[bytesToWrite]);
281 : }
282 : target += bytesToWrite;
283 : }
284 : *sourceStart = source;
285 : *targetStart = target;
286 : return result;
287 : }
288 :
289 : /* --------------------------------------------------------------------- */
290 :
291 : ConversionResult ConvertUTF32toUTF8 (
292 : const UTF32** sourceStart, const UTF32* sourceEnd,
293 : UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
294 : ConversionResult result = conversionOK;
295 : const UTF32* source = *sourceStart;
296 : UTF8* target = *targetStart;
297 : while (source < sourceEnd) {
298 : UTF32 ch;
299 : unsigned short bytesToWrite = 0;
300 : const UTF32 byteMask = 0xBF;
301 : const UTF32 byteMark = 0x80;
302 : ch = *source++;
303 : if (flags == strictConversion ) {
304 : /* UTF-16 surrogate values are illegal in UTF-32 */
305 : if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
306 : --source; /* return to the illegal value itself */
307 : result = sourceIllegal;
308 : break;
309 : }
310 : }
311 : /*
312 : * Figure out how many bytes the result will require. Turn any
313 : * illegally large UTF32 things (> Plane 17) into replacement chars.
314 : */
315 : if (ch < (UTF32)0x80) { bytesToWrite = 1;
316 : } else if (ch < (UTF32)0x800) { bytesToWrite = 2;
317 : } else if (ch < (UTF32)0x10000) { bytesToWrite = 3;
318 : } else if (ch <= UNI_MAX_LEGAL_UTF32) { bytesToWrite = 4;
319 : } else { bytesToWrite = 3;
320 : ch = UNI_REPLACEMENT_CHAR;
321 : result = sourceIllegal;
322 : }
323 :
324 : target += bytesToWrite;
325 : if (target > targetEnd) {
326 : --source; /* Back up source pointer! */
327 : target -= bytesToWrite; result = targetExhausted; break;
328 : }
329 : switch (bytesToWrite) { /* note: everything falls through. */
330 : case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
331 : case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
332 : case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
333 : case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
334 : }
335 : target += bytesToWrite;
336 : }
337 : *sourceStart = source;
338 : *targetStart = target;
339 : return result;
340 : }
341 :
342 : /* --------------------------------------------------------------------- */
343 :
344 : ConversionResult ConvertUTF8toUTF32 (
345 : const UTF8** sourceStart, const UTF8* sourceEnd,
346 : UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
347 : ConversionResult result = conversionOK;
348 : const UTF8* source = *sourceStart;
349 : UTF32* target = *targetStart;
350 : while (source < sourceEnd) {
351 : UTF32 ch = 0;
352 : unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
353 : if (source + extraBytesToRead >= sourceEnd) {
354 : result = sourceExhausted; break;
355 : }
356 : /* Do this check whether lenient or strict */
357 : if (!isLegalUTF8(source, extraBytesToRead+1)) {
358 : result = sourceIllegal;
359 : break;
360 : }
361 : /*
362 : * The cases all fall through. See "Note A" below.
363 : */
364 : switch (extraBytesToRead) {
365 : case 5: ch += *source++; ch <<= 6;
366 : case 4: ch += *source++; ch <<= 6;
367 : case 3: ch += *source++; ch <<= 6;
368 : case 2: ch += *source++; ch <<= 6;
369 : case 1: ch += *source++; ch <<= 6;
370 : case 0: ch += *source++;
371 : }
372 : ch -= offsetsFromUTF8[extraBytesToRead];
373 :
374 : if (target >= targetEnd) {
375 : source -= (extraBytesToRead+1); /* Back up the source pointer! */
376 : result = targetExhausted; break;
377 : }
378 : if (ch <= UNI_MAX_LEGAL_UTF32) {
379 : /*
380 : * UTF-16 surrogate values are illegal in UTF-32, and anything
381 : * over Plane 17 (> 0x10FFFF) is illegal.
382 : */
383 : if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
384 : if (flags == strictConversion) {
385 : source -= (extraBytesToRead+1); /* return to the illegal value itself */
386 : result = sourceIllegal;
387 : break;
388 : } else {
389 : *target++ = UNI_REPLACEMENT_CHAR;
390 : }
391 : } else {
392 : *target++ = ch;
393 : }
394 : } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */
395 : result = sourceIllegal;
396 : *target++ = UNI_REPLACEMENT_CHAR;
397 : }
398 : }
399 : *sourceStart = source;
400 : *targetStart = target;
401 : return result;
402 : }
403 : #endif
404 :
405 : /* --------------------------------------------------------------------- */
406 :
407 : /*
408 : * Utility routine to tell whether a sequence of bytes is legal UTF-8.
409 : * This must be called with the length pre-determined by the first byte.
410 : * If not calling this from ConvertUTF8to*, then the length can be set by:
411 : * length = trailingBytesForUTF8[*source]+1;
412 : * and the sequence is illegal right away if there aren't that many bytes
413 : * available.
414 : * If presented with a length > 4, this returns false. The Unicode
415 : * definition of UTF-8 goes up to 4-byte sequences.
416 : */
417 :
418 44: static Boolean isLegalUTF8(const UTF8 *source, int length) {
419 : UTF8 a;
420 44: const UTF8 *srcptr = source+length;
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421 44: switch (length) {
422 0: default: return false;
423 : /* Everything else falls through when "true"... */
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424 0: case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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425 8: case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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426 8: case 2: if ((a = (*--srcptr)) > 0xBF) return false;
427 :
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428 8: switch (*source) {
429 : /* no fall-through in this inner switch */
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430 0: case 0xE0: if (a < 0xA0) return false; break;
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431 0: case 0xED: if (a > 0x9F) return false; break;
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432 0: case 0xF0: if (a < 0x90) return false; break;
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433 0: case 0xF4: if (a > 0x8F) return false; break;
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434 8: default: if (a < 0x80) return false;
435 : }
436 :
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437 44: case 1: if (*source >= 0x80 && *source < 0xC2) return false;
438 : }
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439 44: if (*source > 0xF4) return false;
440 44: return true;
441 : }
442 :
443 : /* --------------------------------------------------------------------- */
444 :
445 : /*
446 : * Exported function to return whether a UTF-8 sequence is legal or not.
447 : * This is not used here; it's just exported.
448 : */
449 0: Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
450 0: int length = trailingBytesForUTF8[*source]+1;
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451 0: if (source+length > sourceEnd) {
452 0: return false;
453 : }
454 0: return isLegalUTF8(source, length);
455 : }
456 :
457 : /* --------------------------------------------------------------------- */
458 :
459 : ConversionResult ConvertUTF8toUTF16 (
460 : const UTF8** sourceStart, const UTF8* sourceEnd,
461 4: UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
462 4: ConversionResult result = conversionOK;
463 4: const UTF8* source = *sourceStart;
464 4: UTF16* target = *targetStart;
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465 52: while (source < sourceEnd) {
466 44: UTF32 ch = 0;
467 44: unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
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468 44: if (source + extraBytesToRead >= sourceEnd) {
469 0: result = sourceExhausted; break;
470 : }
471 : /* Do this check whether lenient or strict */
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472 44: if (!isLegalUTF8(source, extraBytesToRead+1)) {
473 0: result = sourceIllegal;
474 0: break;
475 : }
476 : /*
477 : * The cases all fall through. See "Note A" below.
478 : */
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479 44: switch (extraBytesToRead) {
480 0: case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
481 0: case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
482 0: case 3: ch += *source++; ch <<= 6;
483 8: case 2: ch += *source++; ch <<= 6;
484 8: case 1: ch += *source++; ch <<= 6;
485 44: case 0: ch += *source++;
486 : }
487 44: ch -= offsetsFromUTF8[extraBytesToRead];
488 :
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489 44: if (target >= targetEnd) {
490 0: source -= (extraBytesToRead+1); /* Back up source pointer! */
491 0: result = targetExhausted; break;
492 : }
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493 44: if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
494 : /* UTF-16 surrogate values are illegal in UTF-32 */
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495 44: if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
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496 0: if (flags == strictConversion) {
497 0: source -= (extraBytesToRead+1); /* return to the illegal value itself */
498 0: result = sourceIllegal;
499 0: break;
500 : } else {
501 0: *target++ = UNI_REPLACEMENT_CHAR;
502 : }
503 : } else {
504 44: *target++ = (UTF16)ch; /* normal case */
505 : }
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506 0: } else if (ch > UNI_MAX_UTF16) {
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507 0: if (flags == strictConversion) {
508 0: result = sourceIllegal;
509 0: source -= (extraBytesToRead+1); /* return to the start */
510 0: break; /* Bail out; shouldn't continue */
511 : } else {
512 0: *target++ = UNI_REPLACEMENT_CHAR;
513 : }
514 : } else {
515 : /* target is a character in range 0xFFFF - 0x10FFFF. */
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516 0: if (target + 1 >= targetEnd) {
517 0: source -= (extraBytesToRead+1); /* Back up source pointer! */
518 0: result = targetExhausted; break;
519 : }
520 0: ch -= halfBase;
521 0: *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
522 0: *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
523 : }
524 : }
525 4: *sourceStart = source;
526 4: *targetStart = target;
527 4: return result;
528 : }
529 :
530 : /* ---------------------------------------------------------------------
531 :
532 : Note A.
533 : The fall-through switches in UTF-8 reading code save a
534 : temp variable, some decrements & conditionals. The switches
535 : are equivalent to the following loop:
536 : {
537 : int tmpBytesToRead = extraBytesToRead+1;
538 : do {
539 : ch += *source++;
540 : --tmpBytesToRead;
541 : if (tmpBytesToRead) ch <<= 6;
542 : } while (tmpBytesToRead > 0);
543 : }
544 : In UTF-8 writing code, the switches on "bytesToWrite" are
545 : similarly unrolled loops.
546 :
547 : --------------------------------------------------------------------- */
