ICU 63.1: utf8.h Source File

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 "unicode/umachine.h"
00038 #ifndef __UTF_H__
00039 #   include "unicode/utf.h"
00040 #endif
00041 
00042 /* internal definitions ----------------------------------------------------- */
00043 
00055 #define U8_COUNT_TRAIL_BYTES(leadByte) \
00056     (U8_IS_LEAD(leadByte) ? \
00057         ((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0)+1 : 0)
00058 
00070 #define U8_COUNT_TRAIL_BYTES_UNSAFE(leadByte) \
00071     (((uint8_t)(leadByte)>=0xc2)+((uint8_t)(leadByte)>=0xe0)+((uint8_t)(leadByte)>=0xf0))
00072 
00080 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
00081 
00090 #define U8_LEAD3_T1_BITS "\x20\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x10\x30\x30"
00091 
00097 #define U8_IS_VALID_LEAD3_AND_T1(lead, t1) (U8_LEAD3_T1_BITS[(lead)&0xf]&(1<<((uint8_t)(t1)>>5)))
00098 
00107 #define U8_LEAD4_T1_BITS "\x00\x00\x00\x00\x00\x00\x00\x00\x1E\x0F\x0F\x0F\x00\x00\x00\x00"
00108 
00114 #define U8_IS_VALID_LEAD4_AND_T1(lead, t1) (U8_LEAD4_T1_BITS[(uint8_t)(t1)>>4]&(1<<((lead)&7)))
00115 
00125 U_STABLE UChar32 U_EXPORT2
00126 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
00127 
00137 U_STABLE int32_t U_EXPORT2
00138 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
00139 
00149 U_STABLE UChar32 U_EXPORT2
00150 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
00151 
00161 U_STABLE int32_t U_EXPORT2
00162 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
00163 
00164 /* single-code point definitions -------------------------------------------- */
00165 
00172 #define U8_IS_SINGLE(c) (((c)&0x80)==0)
00173 
00180 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc2)<=0x32)
00181 // 0x32=0xf4-0xc2
00182 
00189 #define U8_IS_TRAIL(c) ((int8_t)(c)<-0x40)
00190 
00198 #define U8_LENGTH(c) \
00199     ((uint32_t)(c)<=0x7f ? 1 : \
00200         ((uint32_t)(c)<=0x7ff ? 2 : \
00201             ((uint32_t)(c)<=0xd7ff ? 3 : \
00202                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
00203                     ((uint32_t)(c)<=0xffff ? 3 : 4)\
00204                 ) \
00205             ) \
00206         ) \
00207     )
00208 
00214 #define U8_MAX_LENGTH 4
00215 
00232 #define U8_GET_UNSAFE(s, i, c) { \
00233     int32_t _u8_get_unsafe_index=(int32_t)(i); \
00234     U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
00235     U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
00236 }
00237 
00259 #define U8_GET(s, start, i, length, c) { \
00260     int32_t _u8_get_index=(i); \
00261     U8_SET_CP_START(s, start, _u8_get_index); \
00262     U8_NEXT(s, _u8_get_index, length, c); \
00263 }
00264 
00290 #define U8_GET_OR_FFFD(s, start, i, length, c) { \
00291     int32_t _u8_get_index=(i); \
00292     U8_SET_CP_START(s, start, _u8_get_index); \
00293     U8_NEXT_OR_FFFD(s, _u8_get_index, length, c); \
00294 }
00295 
00296 /* definitions with forward iteration --------------------------------------- */
00297 
00315 #define U8_NEXT_UNSAFE(s, i, c) { \
00316     (c)=(uint8_t)(s)[(i)++]; \
00317     if(!U8_IS_SINGLE(c)) { \
00318         if((c)<0xe0) { \
00319             (c)=(((c)&0x1f)<<6)|((s)[(i)++]&0x3f); \
00320         } else if((c)<0xf0) { \
00321             /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
00322             (c)=(UChar)(((c)<<12)|(((s)[i]&0x3f)<<6)|((s)[(i)+1]&0x3f)); \
00323             (i)+=2; \
00324         } else { \
00325             (c)=(((c)&7)<<18)|(((s)[i]&0x3f)<<12)|(((s)[(i)+1]&0x3f)<<6)|((s)[(i)+2]&0x3f); \
00326             (i)+=3; \
00327         } \
00328     } \
00329 }
00330 
00351 #define U8_NEXT(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, U_SENTINEL)
00352 
00377 #define U8_NEXT_OR_FFFD(s, i, length, c) U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, 0xfffd)
00378 
00380 #define U8_INTERNAL_NEXT_OR_SUB(s, i, length, c, sub) { \
00381     (c)=(uint8_t)(s)[(i)++]; \
00382     if(!U8_IS_SINGLE(c)) { \
00383         uint8_t __t = 0; \
00384         if((i)!=(length) && \
00385             /* fetch/validate/assemble all but last trail byte */ \
00386             ((c)>=0xe0 ? \
00387                 ((c)<0xf0 ?  /* U+0800..U+FFFF except surrogates */ \
00388                     U8_LEAD3_T1_BITS[(c)&=0xf]&(1<<((__t=(s)[i])>>5)) && \
00389                     (__t&=0x3f, 1) \
00390                 :  /* U+10000..U+10FFFF */ \
00391                     ((c)-=0xf0)<=4 && \
00392                     U8_LEAD4_T1_BITS[(__t=(s)[i])>>4]&(1<<(c)) && \
00393                     ((c)=((c)<<6)|(__t&0x3f), ++(i)!=(length)) && \
00394                     (__t=(s)[i]-0x80)<=0x3f) && \
00395                 /* valid second-to-last trail byte */ \
00396                 ((c)=((c)<<6)|__t, ++(i)!=(length)) \
00397             :  /* U+0080..U+07FF */ \
00398                 (c)>=0xc2 && ((c)&=0x1f, 1)) && \
00399             /* last trail byte */ \
00400             (__t=(s)[i]-0x80)<=0x3f && \
00401             ((c)=((c)<<6)|__t, ++(i), 1)) { \
00402         } else { \
00403             (c)=(sub);  /* ill-formed*/ \
00404         } \
00405     } \
00406 }
00407 
00421 #define U8_APPEND_UNSAFE(s, i, c) { \
00422     uint32_t __uc=(c); \
00423     if(__uc<=0x7f) { \
00424         (s)[(i)++]=(uint8_t)__uc; \
00425     } else { \
00426         if(__uc<=0x7ff) { \
00427             (s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \
00428         } else { \
00429             if(__uc<=0xffff) { \
00430                 (s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \
00431             } else { \
00432                 (s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \
00433                 (s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \
00434             } \
00435             (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
00436         } \
00437         (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
00438     } \
00439 }
00440 
00458 #define U8_APPEND(s, i, capacity, c, isError) { \
00459     uint32_t __uc=(c); \
00460     if(__uc<=0x7f) { \
00461         (s)[(i)++]=(uint8_t)__uc; \
00462     } else if(__uc<=0x7ff && (i)+1<(capacity)) { \
00463         (s)[(i)++]=(uint8_t)((__uc>>6)|0xc0); \
00464         (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
00465     } else if((__uc<=0xd7ff || (0xe000<=__uc && __uc<=0xffff)) && (i)+2<(capacity)) { \
00466         (s)[(i)++]=(uint8_t)((__uc>>12)|0xe0); \
00467         (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
00468         (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
00469     } else if(0xffff<__uc && __uc<=0x10ffff && (i)+3<(capacity)) { \
00470         (s)[(i)++]=(uint8_t)((__uc>>18)|0xf0); \
00471         (s)[(i)++]=(uint8_t)(((__uc>>12)&0x3f)|0x80); \
00472         (s)[(i)++]=(uint8_t)(((__uc>>6)&0x3f)|0x80); \
00473         (s)[(i)++]=(uint8_t)((__uc&0x3f)|0x80); \
00474     } else { \
00475         (isError)=TRUE; \
00476     } \
00477 }
00478 
00489 #define U8_FWD_1_UNSAFE(s, i) { \
00490     (i)+=1+U8_COUNT_TRAIL_BYTES_UNSAFE((s)[i]); \
00491 }
00492 
00506 #define U8_FWD_1(s, i, length) { \
00507     uint8_t __b=(s)[(i)++]; \
00508     if(U8_IS_LEAD(__b) && (i)!=(length)) { \
00509         uint8_t __t1=(s)[i]; \
00510         if((0xe0<=__b && __b<0xf0)) { \
00511             if(U8_IS_VALID_LEAD3_AND_T1(__b, __t1) && \
00512                     ++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \
00513                 ++(i); \
00514             } \
00515         } else if(__b<0xe0) { \
00516             if(U8_IS_TRAIL(__t1)) { \
00517                 ++(i); \
00518             } \
00519         } else /* c>=0xf0 */ { \
00520             if(U8_IS_VALID_LEAD4_AND_T1(__b, __t1) && \
00521                     ++(i)!=(length) && U8_IS_TRAIL((s)[i]) && \
00522                     ++(i)!=(length) && U8_IS_TRAIL((s)[i])) { \
00523                 ++(i); \
00524             } \
00525         } \
00526     } \
00527 }
00528 
00541 #define U8_FWD_N_UNSAFE(s, i, n) { \
00542     int32_t __N=(n); \
00543     while(__N>0) { \
00544         U8_FWD_1_UNSAFE(s, i); \
00545         --__N; \
00546     } \
00547 }
00548 
00564 #define U8_FWD_N(s, i, length, n) { \
00565     int32_t __N=(n); \
00566     while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
00567         U8_FWD_1(s, i, length); \
00568         --__N; \
00569     } \
00570 }
00571 
00585 #define U8_SET_CP_START_UNSAFE(s, i) { \
00586     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00587 }
00588 
00606 #define U8_SET_CP_START(s, start, i) { \
00607     if(U8_IS_TRAIL((s)[(i)])) { \
00608         (i)=utf8_back1SafeBody(s, start, (i)); \
00609     } \
00610 }
00611 
00612 #ifndef U_HIDE_DRAFT_API
00613 
00639 #define U8_TRUNCATE_IF_INCOMPLETE(s, start, length) \
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 #endif  // U_HIDE_DRAFT_API
00662 
00663 /* definitions with backward iteration -------------------------------------- */
00664 
00684 #define U8_PREV_UNSAFE(s, i, c) { \
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 }
00705 
00726 #define U8_PREV(s, start, i, c) { \
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 }
00732 
00757 #define U8_PREV_OR_FFFD(s, start, i, c) { \
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 }
00763 
00775 #define U8_BACK_1_UNSAFE(s, i) { \
00776     while(U8_IS_TRAIL((s)[--(i)])) {} \
00777 }
00778 
00791 #define U8_BACK_1(s, start, i) { \
00792     if(U8_IS_TRAIL((s)[--(i)])) { \
00793         (i)=utf8_back1SafeBody(s, start, (i)); \
00794     } \
00795 }
00796 
00810 #define U8_BACK_N_UNSAFE(s, i, n) { \
00811     int32_t __N=(n); \
00812     while(__N>0) { \
00813         U8_BACK_1_UNSAFE(s, i); \
00814         --__N; \
00815     } \
00816 }
00817 
00832 #define U8_BACK_N(s, start, i, n) { \
00833     int32_t __N=(n); \
00834     while(__N>0 && (i)>(start)) { \
00835         U8_BACK_1(s, start, i); \
00836         --__N; \
00837     } \
00838 }
00839 
00853 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00854     U8_BACK_1_UNSAFE(s, i); \
00855     U8_FWD_1_UNSAFE(s, i); \
00856 }
00857 
00875 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00876     if((start)<(i) && ((i)<(length) || (length)<0)) { \
00877         U8_BACK_1(s, start, i); \
00878         U8_FWD_1(s, i, length); \
00879     } \
00880 }
00881 
00882 #endif