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ICU 73.2
73.2
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00001 // © 2016 and later: Unicode, Inc. and others. 00002 // License & terms of use: http://www.unicode.org/copyright.html 00003 /* 00004 ******************************************************************************* 00005 * 00006 * Copyright (C) 1999-2015, International Business Machines 00007 * Corporation and others. All Rights Reserved. 00008 * 00009 ******************************************************************************* 00010 * file name: utf8.h 00011 * encoding: UTF-8 00012 * tab size: 8 (not used) 00013 * indentation:4 00014 * 00015 * created on: 1999sep13 00016 * created by: Markus W. Scherer 00017 */ 00018 00034 #ifndef __UTF8_H__ 00035 #define __UTF8_H__ 00036 00037 #include <stdbool.h> 00038 #include "unicode/umachine.h" 00039 #ifndef __UTF_H__ 00040 # include "unicode/utf.h" 00041 #endif 00042 00043 /* internal definitions ----------------------------------------------------- */ 00044 00056 #define U8_COUNT_TRAIL_BYTES(leadByte) \ 00057 (U8_IS_LEAD(leadByte) ? \ 00058 ((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0)+1 : 0) 00059 00071 #define U8_COUNT_TRAIL_BYTES_UNSAFE(leadByte) \ 00072 (((uint8_t)(leadByte)>=0xc2)+((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0)) 00073 00081 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1) 00082 00091 #define U8_LEAD3_T1_BITS "\x20\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x10\x30\x30" 00092 00098 #define U8_IS_VALID_LEAD3_AND_T1(lead, t1) (U8_LEAD3_T1_BITS[(lead)&0xf]&(1<<((uint8_t)(t1)>>5))) 00099 00108 #define U8_LEAD4_T1_BITS "\x00\x00\x00\x00\x00\x00\x00\x00\x1E\x0F\x0F\x0F\x00\x00\x00\x00" 00109 00115 #define U8_IS_VALID_LEAD4_AND_T1(lead, t1) (U8_LEAD4_T1_BITS[(uint8_t)(t1)>>4]&(1<<((lead)&7))) 00116 00126 U_CAPI UChar32 U_EXPORT2 00127 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict); 00128 00138 U_CAPI int32_t U_EXPORT2 00139 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError); 00140 00150 U_CAPI UChar32 U_EXPORT2 00151 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict); 00152 00162 U_CAPI int32_t U_EXPORT2 00163 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i); 00164 00165 /* single-code point definitions -------------------------------------------- */ 00166 00173 #define U8_IS_SINGLE(c) (((c)&0x80)==0) 00174 00181 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc2)<=0x32) 00182 // 0x32=0xf4-0xc2 00183 00190 #define U8_IS_TRAIL(c) ((int8_t)(c)<-0x40) 00191 00199 #define U8_LENGTH(c) \ 00200 ((uint32_t)(c)<=0x7f ? 1 : \ 00201 ((uint32_t)(c)<=0x7ff ? 2 : \ 00202 ((uint32_t)(c)<=0xd7ff ? 3 : \ 00203 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \ 00204 ((uint32_t)(c)<=0xffff ? 3 : 4)\ 00205 ) \ 00206 ) \ 00207 ) \ 00208 ) 00209 00215 #define U8_MAX_LENGTH 4 00216 00233 #define U8_GET_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00234 int32_t _u8_get_unsafe_index=(int32_t)(i); \ 00235 U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \ 00236 U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \ 00237 } UPRV_BLOCK_MACRO_END 00238 00260 #define U8_GET(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ 00261 int32_t _u8_get_index=(i); \ 00262 U8_SET_CP_START(s, start, _u8_get_index); \ 00263 U8_NEXT(s, _u8_get_index, length, c); \ 00264 } UPRV_BLOCK_MACRO_END 00265 00291 #define U8_GET_OR_FFFD(s, start, i, length, c) UPRV_BLOCK_MACRO_BEGIN { \ 00292 int32_t _u8_get_index=(i); \ 00293 U8_SET_CP_START(s, start, _u8_get_index); \ 00294 U8_NEXT_OR_FFFD(s, _u8_get_index, length, c); \ 00295 } UPRV_BLOCK_MACRO_END 00296 00297 /* definitions with forward iteration --------------------------------------- */ 00298 00316 #define U8_NEXT_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00317 (c)=(uint8_t)(s)[(i)++]; \ 00318 if(!U8_IS_SINGLE(c)) { \ 00319 if((c)<0xe0) { \ 00320 (c)=(((c)&0x1f)<<6)|((s)[(i)++]&0x3f); \ 00321 } else if((c)<0xf0) { \ 00322 /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \ 00323 (c)=(UChar)(((c)<<12)|(((s)[i]&0x3f)<<6)|((s)[(i)+1]&0x3f)); \ 00324 (i)+=2; \ 00325 } else { \ 00326 (c)=(((c)&7)<<18)|(((s)[i]&0x3f)<<12)|(((s)[(i)+1]&0x3f)<<6)|((s)[(i)+2]&0x3f); \ 00327 (i)+=3; \ 00328 } \ 00329 } \ 00330 } UPRV_BLOCK_MACRO_END 00331 00352 #define U8_NEXT(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, U_SENTINEL) 00353 00378 #define U8_NEXT_OR_FFFD(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, 0xfffd) 00379 00381 #define U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, sub) UPRV_BLOCK_MACRO_BEGIN { \ 00382 (c)=(uint8_t)(s)[(i)++]; \ 00383 if(!U8_IS_SINGLE(c)) { \ 00384 uint8_t __t = 0; \ 00385 if((i)!=(length) && \ 00386 /* fetch/validate/assemble all but last trail byte */ \ 00387 ((c)>=0xe0 ? \ 00388 ((c)<0xf0 ? /* U+0800..U+FFFF except surrogates */ \ 00389 U8_LEAD3_T1_BITS[(c)&=0xf]&(1<<((__t=(s)[i])>>5)) && \ 00390 (__t&=0x3f, 1) \ 00391 : /* U+10000..U+10FFFF */ \ 00392 ((c)-=0xf0)<=4 && \ 00393 U8_LEAD4_T1_BITS[(__t=(s)[i])>>4]&(1<<(c)) && \ 00394 ((c)=((c)<<6)|(__t&0x3f), ++(i)!=(length)) && \ 00395 (__t=(s)[i]-0x80)<=0x3f) && \ 00396 /* valid second-to-last trail byte */ \ 00397 ((c)=((c)<<6)|__t, ++(i)!=(length)) \ 00398 : /* U+0080..U+07FF */ \ 00399 (c)>=0xc2 && ((c)&=0x1f, 1)) && \ 00400 /* last trail byte */ \ 00401 (__t=(s)[i]-0x80)<=0x3f && \ 00402 ((c)=((c)<<6)|__t, ++(i), 1)) { \ 00403 } else { \ 00404 (c)=(sub); /* ill-formed*/ \ 00405 } \ 00406 } \ 00407 } UPRV_BLOCK_MACRO_END 00408 00422 #define U8_APPEND_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00423 uint32_t __uc=(c); \ 00424 if(__uc<=0x7f) { \ 00425 (s)[(i)++]=(uint8_t)__uc; \ 00426 } else { \ 00427 if(__uc<=0x7ff) { \ 00428 (s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \ 00429 } else { \ 00430 if(__uc<=0xffff) { \ 00431 (s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \ 00432 } else { \ 00433 (s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \ 00434 (s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \ 00435 } \ 00436 (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \ 00437 } \ 00438 (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \ 00439 } \ 00440 } UPRV_BLOCK_MACRO_END 00441 00459 #define U8_APPEND(s, i, capacity, c, isError) UPRV_BLOCK_MACRO_BEGIN { \ 00460 uint32_t __uc=(c); \ 00461 if(__uc<=0x7f) { \ 00462 (s)[(i)++]=(uint8_t)__uc; \ 00463 } else if(__uc<=0x7ff && (i)+1<(capacity)) { \ 00464 (s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \ 00465 (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \ 00466 } else if((__uc<=0xd7ff || (0xe000<=__uc && __uc<=0xffff)) && (i)+2<(capacity)) { \ 00467 (s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \ 00468 (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \ 00469 (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \ 00470 } else if(0xffff<__uc && __uc<=0x10ffff && (i)+3<(capacity)) { \ 00471 (s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \ 00472 (s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \ 00473 (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \ 00474 (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \ 00475 } else { \ 00476 (isError)=true; \ 00477 } \ 00478 } UPRV_BLOCK_MACRO_END 00479 00490 #define U8_FWD_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ 00491 (i)+=1+U8_COUNT_TRAIL_BYTES_UNSAFE((s)[i]); \ 00492 } UPRV_BLOCK_MACRO_END 00493 00507 #define U8_FWD_1(s, i, length) UPRV_BLOCK_MACRO_BEGIN { \ 00508 uint8_t __b=(s)[(i)++]; \ 00509 if(U8_IS_LEAD(__b) && (i)!=(length)) { \ 00510 uint8_t __t1=(s)[i]; \ 00511 if((0xe0<=__b && __b<0xf0)) { \ 00512 if(U8_IS_VALID_LEAD3_AND_T1(__b, __t1) && \ 00513 ++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \ 00514 ++(i); \ 00515 } \ 00516 } else if(__b<0xe0) { \ 00517 if(U8_IS_TRAIL(__t1)) { \ 00518 ++(i); \ 00519 } \ 00520 } else /* c>=0xf0 */ { \ 00521 if(U8_IS_VALID_LEAD4_AND_T1(__b, __t1) && \ 00522 ++(i)!=(length) && U8_IS_TRAIL((s)[i]) && \ 00523 ++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \ 00524 ++(i); \ 00525 } \ 00526 } \ 00527 } \ 00528 } UPRV_BLOCK_MACRO_END 00529 00542 #define U8_FWD_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \ 00543 int32_t __N=(n); \ 00544 while(__N>0) { \ 00545 U8_FWD_1_UNSAFE(s, i); \ 00546 --__N; \ 00547 } \ 00548 } UPRV_BLOCK_MACRO_END 00549 00565 #define U8_FWD_N(s, i, length, n) UPRV_BLOCK_MACRO_BEGIN { \ 00566 int32_t __N=(n); \ 00567 while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \ 00568 U8_FWD_1(s, i, length); \ 00569 --__N; \ 00570 } \ 00571 } UPRV_BLOCK_MACRO_END 00572 00586 #define U8_SET_CP_START_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ 00587 while(U8_IS_TRAIL((s)[i])) { --(i); } \ 00588 } UPRV_BLOCK_MACRO_END 00589 00607 #define U8_SET_CP_START(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \ 00608 if(U8_IS_TRAIL((s)[(i)])) { \ 00609 (i)=utf8_back1SafeBody(s, start, (i)); \ 00610 } \ 00611 } UPRV_BLOCK_MACRO_END 00612 00639 #define U8_TRUNCATE_IF_INCOMPLETE(s, start, length) UPRV_BLOCK_MACRO_BEGIN { \ 00640 if((length)>(start)) { \ 00641 uint8_t __b1=s[(length)-1]; \ 00642 if(U8_IS_SINGLE(__b1)) { \ 00643 /* common ASCII character */ \ 00644 } else if(U8_IS_LEAD(__b1)) { \ 00645 --(length); \ 00646 } else if(U8_IS_TRAIL(__b1) && ((length)-2)>=(start)) { \ 00647 uint8_t __b2=s[(length)-2]; \ 00648 if(0xe0<=__b2 && __b2<=0xf4) { \ 00649 if(__b2<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(__b2, __b1) : \ 00650 U8_IS_VALID_LEAD4_AND_T1(__b2, __b1)) { \ 00651 (length)-=2; \ 00652 } \ 00653 } else if(U8_IS_TRAIL(__b2) && ((length)-3)>=(start)) { \ 00654 uint8_t __b3=s[(length)-3]; \ 00655 if(0xf0<=__b3 && __b3<=0xf4 && U8_IS_VALID_LEAD4_AND_T1(__b3, __b2)) { \ 00656 (length)-=3; \ 00657 } \ 00658 } \ 00659 } \ 00660 } \ 00661 } UPRV_BLOCK_MACRO_END 00662 00663 /* definitions with backward iteration -------------------------------------- */ 00664 00684 #define U8_PREV_UNSAFE(s, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00685 (c)=(uint8_t)(s)[--(i)]; \ 00686 if(U8_IS_TRAIL(c)) { \ 00687 uint8_t __b, __count=1, __shift=6; \ 00688 \ 00689 /* c is a trail byte */ \ 00690 (c)&=0x3f; \ 00691 for(;;) { \ 00692 __b=(s)[--(i)]; \ 00693 if(__b>=0xc0) { \ 00694 U8_MASK_LEAD_BYTE(__b, __count); \ 00695 (c)|=(UChar32)__b<<__shift; \ 00696 break; \ 00697 } else { \ 00698 (c)|=(UChar32)(__b&0x3f)<<__shift; \ 00699 ++__count; \ 00700 __shift+=6; \ 00701 } \ 00702 } \ 00703 } \ 00704 } UPRV_BLOCK_MACRO_END 00705 00726 #define U8_PREV(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00727 (c)=(uint8_t)(s)[--(i)]; \ 00728 if(!U8_IS_SINGLE(c)) { \ 00729 (c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \ 00730 } \ 00731 } UPRV_BLOCK_MACRO_END 00732 00757 #define U8_PREV_OR_FFFD(s, start, i, c) UPRV_BLOCK_MACRO_BEGIN { \ 00758 (c)=(uint8_t)(s)[--(i)]; \ 00759 if(!U8_IS_SINGLE(c)) { \ 00760 (c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -3); \ 00761 } \ 00762 } UPRV_BLOCK_MACRO_END 00763 00775 #define U8_BACK_1_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ 00776 while(U8_IS_TRAIL((s)[--(i)])) {} \ 00777 } UPRV_BLOCK_MACRO_END 00778 00791 #define U8_BACK_1(s, start, i) UPRV_BLOCK_MACRO_BEGIN { \ 00792 if(U8_IS_TRAIL((s)[--(i)])) { \ 00793 (i)=utf8_back1SafeBody(s, start, (i)); \ 00794 } \ 00795 } UPRV_BLOCK_MACRO_END 00796 00810 #define U8_BACK_N_UNSAFE(s, i, n) UPRV_BLOCK_MACRO_BEGIN { \ 00811 int32_t __N=(n); \ 00812 while(__N>0) { \ 00813 U8_BACK_1_UNSAFE(s, i); \ 00814 --__N; \ 00815 } \ 00816 } UPRV_BLOCK_MACRO_END 00817 00832 #define U8_BACK_N(s, start, i, n) UPRV_BLOCK_MACRO_BEGIN { \ 00833 int32_t __N=(n); \ 00834 while(__N>0 && (i)>(start)) { \ 00835 U8_BACK_1(s, start, i); \ 00836 --__N; \ 00837 } \ 00838 } UPRV_BLOCK_MACRO_END 00839 00853 #define U8_SET_CP_LIMIT_UNSAFE(s, i) UPRV_BLOCK_MACRO_BEGIN { \ 00854 U8_BACK_1_UNSAFE(s, i); \ 00855 U8_FWD_1_UNSAFE(s, i); \ 00856 } UPRV_BLOCK_MACRO_END 00857 00875 #define U8_SET_CP_LIMIT(s, start, i, length) UPRV_BLOCK_MACRO_BEGIN { \ 00876 if((start)<(i) && ((i)<(length) || (length)<0)) { \ 00877 U8_BACK_1(s, start, i); \ 00878 U8_FWD_1(s, i, length); \ 00879 } \ 00880 } UPRV_BLOCK_MACRO_END 00881 00882 #endif
1.7.6.1