ICU 4.8.1.1  4.8.1.1
utf8.h
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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 1999-2009, International Business Machines
00005 *   Corporation and others.  All Rights Reserved.
00006 *
00007 *******************************************************************************
00008 *   file name:  utf8.h
00009 *   encoding:   US-ASCII
00010 *   tab size:   8 (not used)
00011 *   indentation:4
00012 *
00013 *   created on: 1999sep13
00014 *   created by: Markus W. Scherer
00015 */
00016 
00034 #ifndef __UTF8_H__
00035 #define __UTF8_H__
00036 
00037 /* utf.h must be included first. */
00038 #ifndef __UTF_H__
00039 #   include "unicode/utf.h"
00040 #endif
00041 
00042 /* internal definitions ----------------------------------------------------- */
00043 
00055 #ifdef U_UTF8_IMPL
00056 U_EXPORT const uint8_t 
00057 #elif defined(U_STATIC_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION)
00058 U_CFUNC const uint8_t
00059 #else
00060 U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/ 
00061 #endif
00062 utf8_countTrailBytes[256];
00063 
00071 #define U8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte])
00072 
00080 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
00081 
00091 U_STABLE UChar32 U_EXPORT2
00092 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
00093 
00103 U_STABLE int32_t U_EXPORT2
00104 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
00105 
00115 U_STABLE UChar32 U_EXPORT2
00116 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
00117 
00127 U_STABLE int32_t U_EXPORT2
00128 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
00129 
00130 /* single-code point definitions -------------------------------------------- */
00131 
00138 #define U8_IS_SINGLE(c) (((c)&0x80)==0)
00139 
00146 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)
00147 
00154 #define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)
00155 
00163 #define U8_LENGTH(c) \
00164     ((uint32_t)(c)<=0x7f ? 1 : \
00165         ((uint32_t)(c)<=0x7ff ? 2 : \
00166             ((uint32_t)(c)<=0xd7ff ? 3 : \
00167                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
00168                     ((uint32_t)(c)<=0xffff ? 3 : 4)\
00169                 ) \
00170             ) \
00171         ) \
00172     )
00173 
00179 #define U8_MAX_LENGTH 4
00180 
00197 #define U8_GET_UNSAFE(s, i, c) { \
00198     int32_t _u8_get_unsafe_index=(int32_t)(i); \
00199     U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
00200     U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
00201 }
00202 
00221 #define U8_GET(s, start, i, length, c) { \
00222     int32_t _u8_get_index=(int32_t)(i); \
00223     U8_SET_CP_START(s, start, _u8_get_index); \
00224     U8_NEXT(s, _u8_get_index, length, c); \
00225 }
00226 
00227 /* definitions with forward iteration --------------------------------------- */
00228 
00246 #define U8_NEXT_UNSAFE(s, i, c) { \
00247     (c)=(uint8_t)(s)[(i)++]; \
00248     if((uint8_t)((c)-0xc0)<0x35) { \
00249         uint8_t __count=U8_COUNT_TRAIL_BYTES(c); \
00250         U8_MASK_LEAD_BYTE(c, __count); \
00251         switch(__count) { \
00252         /* each following branch falls through to the next one */ \
00253         case 3: \
00254             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00255         case 2: \
00256             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00257         case 1: \
00258             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00259         /* no other branches to optimize switch() */ \
00260             break; \
00261         } \
00262     } \
00263 }
00264 
00283 #define U8_NEXT(s, i, length, c) { \
00284     (c)=(uint8_t)(s)[(i)++]; \
00285     if((c)>=0x80) { \
00286         uint8_t __t1, __t2; \
00287         if( /* handle U+1000..U+CFFF inline */ \
00288             (0xe0<(c) && (c)<=0xec) && \
00289             (((i)+1)<(length)) && \
00290             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f && \
00291             (__t2=(uint8_t)((s)[(i)+1]-0x80))<= 0x3f \
00292         ) { \
00293             /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
00294             (c)=(UChar)(((c)<<12)|(__t1<<6)|__t2); \
00295             (i)+=2; \
00296         } else if( /* handle U+0080..U+07FF inline */ \
00297             ((c)<0xe0 && (c)>=0xc2) && \
00298             ((i)<(length)) && \
00299             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f \
00300         ) { \
00301             (c)=(UChar)((((c)&0x1f)<<6)|__t1); \
00302             ++(i); \
00303         } else if(U8_IS_LEAD(c)) { \
00304             /* function call for "complicated" and error cases */ \
00305             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \
00306         } else { \
00307             (c)=U_SENTINEL; \
00308         } \
00309     } \
00310 }
00311 
00325 #define U8_APPEND_UNSAFE(s, i, c) { \
00326     if((uint32_t)(c)<=0x7f) { \
00327         (s)[(i)++]=(uint8_t)(c); \
00328     } else { \
00329         if((uint32_t)(c)<=0x7ff) { \
00330             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00331         } else { \
00332             if((uint32_t)(c)<=0xffff) { \
00333                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00334             } else { \
00335                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
00336                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
00337             } \
00338             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00339         } \
00340         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00341     } \
00342 }
00343 
00361 #define U8_APPEND(s, i, capacity, c, isError) { \
00362     if((uint32_t)(c)<=0x7f) { \
00363         (s)[(i)++]=(uint8_t)(c); \
00364     } else if((uint32_t)(c)<=0x7ff && (i)+1<(capacity)) { \
00365         (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00366         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00367     } else if((uint32_t)(c)<=0xd7ff && (i)+2<(capacity)) { \
00368         (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00369         (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00370         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00371     } else { \
00372         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(capacity), c, &(isError)); \
00373     } \
00374 }
00375 
00386 #define U8_FWD_1_UNSAFE(s, i) { \
00387     (i)+=1+U8_COUNT_TRAIL_BYTES((s)[i]); \
00388 }
00389 
00401 #define U8_FWD_1(s, i, length) { \
00402     uint8_t __b=(uint8_t)(s)[(i)++]; \
00403     if(U8_IS_LEAD(__b)) { \
00404         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
00405         if((i)+__count>(length)) { \
00406             __count=(uint8_t)((length)-(i)); \
00407         } \
00408         while(__count>0 && U8_IS_TRAIL((s)[i])) { \
00409             ++(i); \
00410             --__count; \
00411         } \
00412     } \
00413 }
00414 
00427 #define U8_FWD_N_UNSAFE(s, i, n) { \
00428     int32_t __N=(n); \
00429     while(__N>0) { \
00430         U8_FWD_1_UNSAFE(s, i); \
00431         --__N; \
00432     } \
00433 }
00434 
00448 #define U8_FWD_N(s, i, length, n) { \
00449     int32_t __N=(n); \
00450     while(__N>0 && (i)<(length)) { \
00451         U8_FWD_1(s, i, length); \
00452         --__N; \
00453     } \
00454 }
00455 
00469 #define U8_SET_CP_START_UNSAFE(s, i) { \
00470     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00471 }
00472 
00487 #define U8_SET_CP_START(s, start, i) { \
00488     if(U8_IS_TRAIL((s)[(i)])) { \
00489         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00490     } \
00491 }
00492 
00493 /* definitions with backward iteration -------------------------------------- */
00494 
00514 #define U8_PREV_UNSAFE(s, i, c) { \
00515     (c)=(uint8_t)(s)[--(i)]; \
00516     if(U8_IS_TRAIL(c)) { \
00517         uint8_t __b, __count=1, __shift=6; \
00518 \
00519         /* c is a trail byte */ \
00520         (c)&=0x3f; \
00521         for(;;) { \
00522             __b=(uint8_t)(s)[--(i)]; \
00523             if(__b>=0xc0) { \
00524                 U8_MASK_LEAD_BYTE(__b, __count); \
00525                 (c)|=(UChar32)__b<<__shift; \
00526                 break; \
00527             } else { \
00528                 (c)|=(UChar32)(__b&0x3f)<<__shift; \
00529                 ++__count; \
00530                 __shift+=6; \
00531             } \
00532         } \
00533     } \
00534 }
00535 
00556 #define U8_PREV(s, start, i, c) { \
00557     (c)=(uint8_t)(s)[--(i)]; \
00558     if((c)>=0x80) { \
00559         if((c)<=0xbf) { \
00560             (c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \
00561         } else { \
00562             (c)=U_SENTINEL; \
00563         } \
00564     } \
00565 }
00566 
00578 #define U8_BACK_1_UNSAFE(s, i) { \
00579     while(U8_IS_TRAIL((s)[--(i)])) {} \
00580 }
00581 
00594 #define U8_BACK_1(s, start, i) { \
00595     if(U8_IS_TRAIL((s)[--(i)])) { \
00596         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00597     } \
00598 }
00599 
00613 #define U8_BACK_N_UNSAFE(s, i, n) { \
00614     int32_t __N=(n); \
00615     while(__N>0) { \
00616         U8_BACK_1_UNSAFE(s, i); \
00617         --__N; \
00618     } \
00619 }
00620 
00635 #define U8_BACK_N(s, start, i, n) { \
00636     int32_t __N=(n); \
00637     while(__N>0 && (i)>(start)) { \
00638         U8_BACK_1(s, start, i); \
00639         --__N; \
00640     } \
00641 }
00642 
00656 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00657     U8_BACK_1_UNSAFE(s, i); \
00658     U8_FWD_1_UNSAFE(s, i); \
00659 }
00660 
00676 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00677     if((start)<(i) && (i)<(length)) { \
00678         U8_BACK_1(s, start, i); \
00679         U8_FWD_1(s, i, length); \
00680     } \
00681 }
00682 
00683 #endif
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