source: trunk/libtransmission/ConvertUTF.c @ 11599

Last change on this file since 11599 was 11599, checked in by charles, 11 years ago

(trunk) Join the 21st century and use only 1 space at the end sentences. This commit is nearly as important as the semi-annual ones that remove trailing spaces from the ends of lines of code... :)

File size: 20.1 KB
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1/*
2 * Copyright 2001-2004 Unicode, Inc.
3 *
4 * Disclaimer
5 *
6 * This source code is provided as is by Unicode, Inc. No claims are
7 * made as to fitness for any particular purpose. No warranties of any
8 * kind are expressed or implied. The recipient agrees to determine
9 * applicability of information provided. If this file has been
10 * purchased on magnetic or optical media from Unicode, Inc., the
11 * sole remedy for any claim will be exchange of defective media
12 * within 90 days of receipt.
13 *
14 * Limitations on Rights to Redistribute This Code
15 *
16 * Unicode, Inc. hereby grants the right to freely use the information
17 * supplied in this file in the creation of products supporting the
18 * Unicode Standard, and to make copies of this file in any form
19 * for internal or external distribution as long as this notice
20 * remains attached.
21 */
22
23/* ---------------------------------------------------------------------
24
25    Conversions between UTF32, UTF-16, and UTF-8. Source code file.
26    Author: Mark E. Davis, 1994.
27    Rev History: Rick McGowan, fixes & updates May 2001.
28    Sept 2001: fixed const & error conditions per
29        mods suggested by S. Parent & A. Lillich.
30    June 2002: Tim Dodd added detection and handling of incomplete
31        source sequences, enhanced error detection, added casts
32        to eliminate compiler warnings.
33    July 2003: slight mods to back out aggressive FFFE detection.
34    Jan 2004: updated switches in from-UTF8 conversions.
35    Oct 2004: updated to use UNI_MAX_LEGAL_UTF32 in UTF-32 conversions.
36    May 2006: updated isLegalUTF8Sequence.
37
38    See the header file "ConvertUTF.h" for complete documentation.
39
40------------------------------------------------------------------------ */
41
42#ifdef CVTUTF_DEBUG
43 #include <stdio.h>
44#endif
45#include <string.h> /* strlen() */
46#include "ConvertUTF.h"
47
48static const int halfShift  = 10; /* used for shifting by 10 bits */
49
50static const UTF32 halfBase = 0x0010000UL;
51static const UTF32 halfMask = 0x3FFUL;
52
53#define UNI_SUR_HIGH_START  (UTF32)0xD800
54#define UNI_SUR_HIGH_END    (UTF32)0xDBFF
55#define UNI_SUR_LOW_START   (UTF32)0xDC00
56#define UNI_SUR_LOW_END     (UTF32)0xDFFF
57#define false      0
58#define true        1
59
60/* --------------------------------------------------------------------- */
61
62ConversionResult ConvertUTF32toUTF16 (
63        const UTF32** sourceStart, const UTF32* sourceEnd, 
64        UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
65    ConversionResult result = conversionOK;
66    const UTF32* source = *sourceStart;
67    UTF16* target = *targetStart;
68    while (source < sourceEnd) {
69        UTF32 ch;
70        if (target >= targetEnd) {
71            result = targetExhausted; break;
72        }
73        ch = *source++;
74        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
75            /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */
76            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
77                if (flags == strictConversion) {
78                    --source; /* return to the illegal value itself */
79                    result = sourceIllegal;
80                    break;
81                } else {
82                    *target++ = UNI_REPLACEMENT_CHAR;
83                }
84            } else {
85                *target++ = (UTF16)ch; /* normal case */
86            }
87        } else if (ch > UNI_MAX_LEGAL_UTF32) {
88            if (flags == strictConversion) {
89                result = sourceIllegal;
90            } else {
91                *target++ = UNI_REPLACEMENT_CHAR;
92            }
93        } else {
94            /* target is a character in range 0xFFFF - 0x10FFFF. */
95            if (target + 1 >= targetEnd) {
96                --source; /* Back up source pointer! */
97                result = targetExhausted; break;
98            }
99            ch -= halfBase;
100            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
101            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
102        }
103    }
104    *sourceStart = source;
105    *targetStart = target;
106    return result;
107}
108
109/* --------------------------------------------------------------------- */
110
111ConversionResult ConvertUTF16toUTF32 (
112        const UTF16** sourceStart, const UTF16* sourceEnd, 
113        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
114    ConversionResult result = conversionOK;
115    const UTF16* source = *sourceStart;
116    UTF32* target = *targetStart;
117    UTF32 ch, ch2;
118    while (source < sourceEnd) {
119        const UTF16* oldSource = source; /*  In case we have to back up because of target overflow. */
120        ch = *source++;
121        /* If we have a surrogate pair, convert to UTF32 first. */
122        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
123            /* If the 16 bits following the high surrogate are in the source buffer... */
124            if (source < sourceEnd) {
125                ch2 = *source;
126                /* If it's a low surrogate, convert to UTF32. */
127                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
128                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
129                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
130                    ++source;
131                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
132                    --source; /* return to the illegal value itself */
133                    result = sourceIllegal;
134                    break;
135                }
136            } else { /* We don't have the 16 bits following the high surrogate. */
137                --source; /* return to the high surrogate */
138                result = sourceExhausted;
139                break;
140            }
141        } else if (flags == strictConversion) {
142            /* UTF-16 surrogate values are illegal in UTF-32 */
143            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
144                --source; /* return to the illegal value itself */
145                result = sourceIllegal;
146                break;
147            }
148        }
149        if (target >= targetEnd) {
150            source = oldSource; /* Back up source pointer! */
151            result = targetExhausted; break;
152        }
153        *target++ = ch;
154    }
155    *sourceStart = source;
156    *targetStart = target;
157#ifdef CVTUTF_DEBUG
158if (result == sourceIllegal) {
159    fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);
160    fflush(stderr);
161}
162#endif
163    return result;
164}
165
166/* --------------------------------------------------------------------- */
167
168/*
169 * Index into the table below with the first byte of a UTF-8 sequence to
170 * get the number of trailing bytes that are supposed to follow it.
171 * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
172 * left as-is for anyone who may want to do such conversion, which was
173 * allowed in earlier algorithms.
174 */
175static const char trailingBytesForUTF8[256] = {
176    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,
177    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,
178    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,
179    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,
180    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,
181    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,
182    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,
183    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
184};
185
186/*
187 * Magic values subtracted from a buffer value during UTF8 conversion.
188 * This table contains as many values as there might be trailing bytes
189 * in a UTF-8 sequence.
190 */
191static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 
192                     0x03C82080UL, 0xFA082080UL, 0x82082080UL };
193
194/*
195 * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
196 * into the first byte, depending on how many bytes follow. There are
197 * as many entries in this table as there are UTF-8 sequence types.
198 * (I.e., one byte sequence, two byte... etc.). Remember that sequencs
199 * for *legal* UTF-8 will be 4 or fewer bytes total.
200 */
201static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
202
203/* --------------------------------------------------------------------- */
204
205/* The interface converts a whole buffer to avoid function-call overhead.
206 * Constants have been gathered. Loops & conditionals have been removed as
207 * much as possible for efficiency, in favor of drop-through switches.
208 * (See "Note A" at the bottom of the file for equivalent code.)
209 * If your compiler supports it, the "isLegalUTF8" call can be turned
210 * into an inline function.
211 */
212
213/* --------------------------------------------------------------------- */
214
215ConversionResult ConvertUTF16toUTF8 (
216        const UTF16** sourceStart, const UTF16* sourceEnd, 
217        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
218    ConversionResult result = conversionOK;
219    const UTF16* source = *sourceStart;
220    UTF8* target = *targetStart;
221    while (source < sourceEnd) {
222        UTF32 ch;
223        unsigned short bytesToWrite = 0;
224        const UTF32 byteMask = 0xBF;
225        const UTF32 byteMark = 0x80; 
226        const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */
227        ch = *source++;
228        /* If we have a surrogate pair, convert to UTF32 first. */
229        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
230            /* If the 16 bits following the high surrogate are in the source buffer... */
231            if (source < sourceEnd) {
232                UTF32 ch2 = *source;
233                /* If it's a low surrogate, convert to UTF32. */
234                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
235                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
236                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
237                    ++source;
238                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
239                    --source; /* return to the illegal value itself */
240                    result = sourceIllegal;
241                    break;
242                }
243            } else { /* We don't have the 16 bits following the high surrogate. */
244                --source; /* return to the high surrogate */
245                result = sourceExhausted;
246                break;
247            }
248        } else if (flags == strictConversion) {
249            /* UTF-16 surrogate values are illegal in UTF-32 */
250            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
251                --source; /* return to the illegal value itself */
252                result = sourceIllegal;
253                break;
254            }
255        }
256        /* Figure out how many bytes the result will require */
257        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
258        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
259        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
260        } else if (ch < (UTF32)0x110000) {  bytesToWrite = 4;
261        } else {                            bytesToWrite = 3;
262                                            ch = UNI_REPLACEMENT_CHAR;
263        }
264
265        target += bytesToWrite;
266        if (target > targetEnd) {
267            source = oldSource; /* Back up source pointer! */
268            target -= bytesToWrite; result = targetExhausted; break;
269        }
270        switch (bytesToWrite) { /* note: everything falls through. */
271            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
272            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
273            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
274            case 1: *--target =  (UTF8)(ch | firstByteMark[bytesToWrite]);
275        }
276        target += bytesToWrite;
277    }
278    *sourceStart = source;
279    *targetStart = target;
280    return result;
281}
282
283/* --------------------------------------------------------------------- */
284
285/*
286 * Utility routine to tell whether a sequence of bytes is legal UTF-8.
287 * This must be called with the length pre-determined by the first byte.
288 * If not calling this from ConvertUTF8to*, then the length can be set by:
289 *  length = trailingBytesForUTF8[*source]+1;
290 * and the sequence is illegal right away if there aren't that many bytes
291 * available.
292 * If presented with a length > 4, this returns false. The Unicode
293 * definition of UTF-8 goes up to 4-byte sequences.
294 */
295
296static Boolean isLegalUTF8(const UTF8 *source, int length) {
297    UTF8 a;
298    const UTF8 *srcptr = source+length;
299    switch (length) {
300    default: return false;
301        /* Everything else falls through when "true"... */
302    case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
303    case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
304    case 2: if ((a = (*--srcptr)) > 0xBF) return false;
305
306        switch (*source) {
307            /* no fall-through in this inner switch */
308            case 0xE0: if (a < 0xA0) return false; break;
309            case 0xED: if ((a < 0x80) || (a > 0x9F)) return false; break;
310            case 0xF0: if (a < 0x90) return false; break;
311            case 0xF4: if (a > 0x8F) return false; break;
312            default:   if (a < 0x80) return false;
313        }
314
315    case 1: if (*source >= 0x80 && *source < 0xC2) return false;
316    }
317    if (*source > 0xF4) return false;
318    return true;
319}
320
321/* --------------------------------------------------------------------- */
322
323/*
324 * Exported function to return whether a UTF-8 sequence is legal or not.
325 * This is not used here; it's just exported.
326 */
327
328Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
329    int length;
330    if (source == sourceEnd) {
331        return true;
332    }
333    while (true) {
334        length = trailingBytesForUTF8[*source]+1;
335        if (source+length > sourceEnd) {
336            return false;
337        }
338        if (!isLegalUTF8(source, length)) {
339            return false;
340        }
341        source += length;
342        if (source >= sourceEnd) {
343            return true;
344        }
345    }
346}
347
348/**
349 * This is a variation of isLegalUTF8Sequence() that behaves like g_utf8_validate().
350 * In addition to knowing if the sequence is legal, it also tells you the last good character.
351 */
352Boolean
353tr_utf8_validate( const char * str, int max_len, const char ** end )
354{
355    const UTF8* source = (const UTF8*) str;
356    const UTF8* sourceEnd;
357
358    if( max_len == 0 )
359        return true;
360
361    if( str == NULL )
362        return false;
363
364    sourceEnd = source + ((max_len < 0) ? strlen(str) : (size_t)max_len);
365
366    if( source == sourceEnd )
367    {
368        if( end != NULL )
369            *end = (const char*) source;
370        return true;
371    }
372
373    for( ;; )
374    {
375        const int length = trailingBytesForUTF8[*source] + 1;
376        if (source + length > sourceEnd) {
377            if( end != NULL )
378                *end = (const char*) source;
379            return false;
380        }
381        if (!isLegalUTF8(source, length)) {
382            if( end != NULL )
383                *end = (const char*) source;
384            return false;
385        }
386        source += length;
387        if (source >= sourceEnd) {
388            if( end != NULL )
389                *end = (const char*) source;
390            return true;
391        }
392    }
393
394   
395}
396
397
398/* --------------------------------------------------------------------- */
399
400ConversionResult ConvertUTF8toUTF16 (
401        const UTF8** sourceStart, const UTF8* sourceEnd, 
402        UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
403    ConversionResult result = conversionOK;
404    const UTF8* source = *sourceStart;
405    UTF16* target = *targetStart;
406    while (source < sourceEnd) {
407        UTF32 ch = 0;
408        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
409        if (source + extraBytesToRead >= sourceEnd) {
410            result = sourceExhausted; break;
411        }
412        /* Do this check whether lenient or strict */
413        if (! isLegalUTF8(source, extraBytesToRead+1)) {
414            result = sourceIllegal;
415            break;
416        }
417        /*
418         * The cases all fall through. See "Note A" below.
419         */
420        switch (extraBytesToRead) {
421            case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
422            case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
423            case 3: ch += *source++; ch <<= 6;
424            case 2: ch += *source++; ch <<= 6;
425            case 1: ch += *source++; ch <<= 6;
426            case 0: ch += *source++;
427        }
428        ch -= offsetsFromUTF8[extraBytesToRead];
429
430        if (target >= targetEnd) {
431            source -= (extraBytesToRead+1); /* Back up source pointer! */
432            result = targetExhausted; break;
433        }
434        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
435            /* UTF-16 surrogate values are illegal in UTF-32 */
436            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
437                if (flags == strictConversion) {
438                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
439                    result = sourceIllegal;
440                    break;
441                } else {
442                    *target++ = UNI_REPLACEMENT_CHAR;
443                }
444            } else {
445                *target++ = (UTF16)ch; /* normal case */
446            }
447        } else if (ch > UNI_MAX_UTF16) {
448            if (flags == strictConversion) {
449                result = sourceIllegal;
450                source -= (extraBytesToRead+1); /* return to the start */
451                break; /* Bail out; shouldn't continue */
452            } else {
453                *target++ = UNI_REPLACEMENT_CHAR;
454            }
455        } else {
456            /* target is a character in range 0xFFFF - 0x10FFFF. */
457            if (target + 1 >= targetEnd) {
458                source -= (extraBytesToRead+1); /* Back up source pointer! */
459                result = targetExhausted; break;
460            }
461            ch -= halfBase;
462            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
463            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
464        }
465    }
466    *sourceStart = source;
467    *targetStart = target;
468    return result;
469}
470
471/* --------------------------------------------------------------------- */
472
473ConversionResult ConvertUTF32toUTF8 (
474        const UTF32** sourceStart, const UTF32* sourceEnd, 
475        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
476    ConversionResult result = conversionOK;
477    const UTF32* source = *sourceStart;
478    UTF8* target = *targetStart;
479    while (source < sourceEnd) {
480        UTF32 ch;
481        unsigned short bytesToWrite = 0;
482        const UTF32 byteMask = 0xBF;
483        const UTF32 byteMark = 0x80; 
484        ch = *source++;
485        if (flags == strictConversion ) {
486            /* UTF-16 surrogate values are illegal in UTF-32 */
487            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
488                --source; /* return to the illegal value itself */
489                result = sourceIllegal;
490                break;
491            }
492        }
493        /*
494         * Figure out how many bytes the result will require. Turn any
495         * illegally large UTF32 things (> Plane 17) into replacement chars.
496         */
497        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
498        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
499        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
500        } else if (ch <= UNI_MAX_LEGAL_UTF32) {  bytesToWrite = 4;
501        } else {                            bytesToWrite = 3;
502                                            ch = UNI_REPLACEMENT_CHAR;
503                                            result = sourceIllegal;
504        }
505       
506        target += bytesToWrite;
507        if (target > targetEnd) {
508            --source; /* Back up source pointer! */
509            target -= bytesToWrite; result = targetExhausted; break;
510        }
511        switch (bytesToWrite) { /* note: everything falls through. */
512            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
513            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
514            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
515            case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
516        }
517        target += bytesToWrite;
518    }
519    *sourceStart = source;
520    *targetStart = target;
521    return result;
522}
523
524/* --------------------------------------------------------------------- */
525
526ConversionResult ConvertUTF8toUTF32 (
527        const UTF8** sourceStart, const UTF8* sourceEnd, 
528        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
529    ConversionResult result = conversionOK;
530    const UTF8* source = *sourceStart;
531    UTF32* target = *targetStart;
532    while (source < sourceEnd) {
533        UTF32 ch = 0;
534        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
535        if (source + extraBytesToRead >= sourceEnd) {
536            result = sourceExhausted; break;
537        }
538        /* Do this check whether lenient or strict */
539        if (! isLegalUTF8(source, extraBytesToRead+1)) {
540            result = sourceIllegal;
541            break;
542        }
543        /*
544         * The cases all fall through. See "Note A" below.
545         */
546        switch (extraBytesToRead) {
547            case 5: ch += *source++; ch <<= 6;
548            case 4: ch += *source++; ch <<= 6;
549            case 3: ch += *source++; ch <<= 6;
550            case 2: ch += *source++; ch <<= 6;
551            case 1: ch += *source++; ch <<= 6;
552            case 0: ch += *source++;
553        }
554        ch -= offsetsFromUTF8[extraBytesToRead];
555
556        if (target >= targetEnd) {
557            source -= (extraBytesToRead+1); /* Back up the source pointer! */
558            result = targetExhausted; break;
559        }
560        if (ch <= UNI_MAX_LEGAL_UTF32) {
561            /*
562             * UTF-16 surrogate values are illegal in UTF-32, and anything
563             * over Plane 17 (> 0x10FFFF) is illegal.
564             */
565            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
566                if (flags == strictConversion) {
567                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
568                    result = sourceIllegal;
569                    break;
570                } else {
571                    *target++ = UNI_REPLACEMENT_CHAR;
572                }
573            } else {
574                *target++ = ch;
575            }
576        } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */
577            result = sourceIllegal;
578            *target++ = UNI_REPLACEMENT_CHAR;
579        }
580    }
581    *sourceStart = source;
582    *targetStart = target;
583    return result;
584}
585
586/* ---------------------------------------------------------------------
587
588    Note A.
589    The fall-through switches in UTF-8 reading code save a
590    temp variable, some decrements & conditionals. The switches
591    are equivalent to the following loop:
592        {
593            int tmpBytesToRead = extraBytesToRead+1;
594            do {
595                ch += *source++;
596                --tmpBytesToRead;
597                if (tmpBytesToRead) ch <<= 6;
598            } while (tmpBytesToRead > 0);
599        }
600    In UTF-8 writing code, the switches on "bytesToWrite" are
601    similarly unrolled loops.
602
603   --------------------------------------------------------------------- */
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