utf8.h

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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 1999-2006, 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 
00050 #ifdef U_UTF8_IMPL
00051 U_EXPORT const uint8_t 
00052 #elif defined(U_STATIC_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION)
00053 U_CFUNC const uint8_t
00054 #else
00055 U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/ 
00056 #endif
00057 utf8_countTrailBytes[256];
00058 
00063 #define U8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte])
00064 
00069 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
00070 
00075 U_INTERNAL UChar32 U_EXPORT2
00076 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
00077 
00082 U_INTERNAL int32_t U_EXPORT2
00083 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
00084 
00089 U_INTERNAL UChar32 U_EXPORT2
00090 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
00091 
00096 U_INTERNAL int32_t U_EXPORT2
00097 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
00098 
00099 /* single-code point definitions -------------------------------------------- */
00100 
00107 #define U8_IS_SINGLE(c) (((c)&0x80)==0)
00108 
00115 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)
00116 
00123 #define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)
00124 
00132 #define U8_LENGTH(c) \
00133     ((uint32_t)(c)<=0x7f ? 1 : \
00134         ((uint32_t)(c)<=0x7ff ? 2 : \
00135             ((uint32_t)(c)<=0xd7ff ? 3 : \
00136                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
00137                     ((uint32_t)(c)<=0xffff ? 3 : 4)\
00138                 ) \
00139             ) \
00140         ) \
00141     )
00142 
00148 #define U8_MAX_LENGTH 4
00149 
00166 #define U8_GET_UNSAFE(s, i, c) { \
00167     int32_t _u8_get_unsafe_index=(int32_t)(i); \
00168     U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
00169     U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
00170 }
00171 
00190 #define U8_GET(s, start, i, length, c) { \
00191     int32_t _u8_get_index=(int32_t)(i); \
00192     U8_SET_CP_START(s, start, _u8_get_index); \
00193     U8_NEXT(s, _u8_get_index, length, c); \
00194 }
00195 
00196 /* definitions with forward iteration --------------------------------------- */
00197 
00215 #define U8_NEXT_UNSAFE(s, i, c) { \
00216     (c)=(uint8_t)(s)[(i)++]; \
00217     if((uint8_t)((c)-0xc0)<0x35) { \
00218         uint8_t __count=U8_COUNT_TRAIL_BYTES(c); \
00219         U8_MASK_LEAD_BYTE(c, __count); \
00220         switch(__count) { \
00221         /* each following branch falls through to the next one */ \
00222         case 3: \
00223             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00224         case 2: \
00225             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00226         case 1: \
00227             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00228         /* no other branches to optimize switch() */ \
00229             break; \
00230         } \
00231     } \
00232 }
00233 
00252 #define U8_NEXT(s, i, length, c) { \
00253     (c)=(uint8_t)(s)[(i)++]; \
00254     if((c)>=0x80) { \
00255         uint8_t __t1, __t2; \
00256         if( /* handle U+1000..U+CFFF inline */ \
00257             (0xe0<(c) && (c)<=0xec) && \
00258             (((i)+1)<(length)) && \
00259             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f && \
00260             (__t2=(uint8_t)((s)[(i)+1]-0x80))<= 0x3f \
00261         ) { \
00262             /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
00263             (c)=(UChar)(((c)<<12)|(__t1<<6)|__t2); \
00264             (i)+=2; \
00265         } else if( /* handle U+0080..U+07FF inline */ \
00266             ((c)<0xe0 && (c)>=0xc2) && \
00267             ((i)<(length)) && \
00268             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f \
00269         ) { \
00270             (c)=(UChar)((((c)&0x1f)<<6)|__t1); \
00271             ++(i); \
00272         } else if(U8_IS_LEAD(c)) { \
00273             /* function call for "complicated" and error cases */ \
00274             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \
00275         } else { \
00276             (c)=U_SENTINEL; \
00277         } \
00278     } \
00279 }
00280 
00294 #define U8_APPEND_UNSAFE(s, i, c) { \
00295     if((uint32_t)(c)<=0x7f) { \
00296         (s)[(i)++]=(uint8_t)(c); \
00297     } else { \
00298         if((uint32_t)(c)<=0x7ff) { \
00299             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00300         } else { \
00301             if((uint32_t)(c)<=0xffff) { \
00302                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00303             } else { \
00304                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
00305                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
00306             } \
00307             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00308         } \
00309         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00310     } \
00311 }
00312 
00330 #define U8_APPEND(s, i, capacity, c, isError) { \
00331     if((uint32_t)(c)<=0x7f) { \
00332         (s)[(i)++]=(uint8_t)(c); \
00333     } else if((uint32_t)(c)<=0x7ff && (i)+1<(capacity)) { \
00334         (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00335         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00336     } else if((uint32_t)(c)<=0xd7ff && (i)+2<(capacity)) { \
00337         (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00338         (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00339         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00340     } else { \
00341         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(capacity), c, &(isError)); \
00342     } \
00343 }
00344 
00355 #define U8_FWD_1_UNSAFE(s, i) { \
00356     (i)+=1+U8_COUNT_TRAIL_BYTES((s)[i]); \
00357 }
00358 
00370 #define U8_FWD_1(s, i, length) { \
00371     uint8_t __b=(uint8_t)(s)[(i)++]; \
00372     if(U8_IS_LEAD(__b)) { \
00373         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
00374         if((i)+__count>(length)) { \
00375             __count=(uint8_t)((length)-(i)); \
00376         } \
00377         while(__count>0 && U8_IS_TRAIL((s)[i])) { \
00378             ++(i); \
00379             --__count; \
00380         } \
00381     } \
00382 }
00383 
00396 #define U8_FWD_N_UNSAFE(s, i, n) { \
00397     int32_t __N=(n); \
00398     while(__N>0) { \
00399         U8_FWD_1_UNSAFE(s, i); \
00400         --__N; \
00401     } \
00402 }
00403 
00417 #define U8_FWD_N(s, i, length, n) { \
00418     int32_t __N=(n); \
00419     while(__N>0 && (i)<(length)) { \
00420         U8_FWD_1(s, i, length); \
00421         --__N; \
00422     } \
00423 }
00424 
00438 #define U8_SET_CP_START_UNSAFE(s, i) { \
00439     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00440 }
00441 
00456 #define U8_SET_CP_START(s, start, i) { \
00457     if(U8_IS_TRAIL((s)[(i)])) { \
00458         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00459     } \
00460 }
00461 
00462 /* definitions with backward iteration -------------------------------------- */
00463 
00483 #define U8_PREV_UNSAFE(s, i, c) { \
00484     (c)=(uint8_t)(s)[--(i)]; \
00485     if(U8_IS_TRAIL(c)) { \
00486         uint8_t __b, __count=1, __shift=6; \
00487 \
00488         /* c is a trail byte */ \
00489         (c)&=0x3f; \
00490         for(;;) { \
00491             __b=(uint8_t)(s)[--(i)]; \
00492             if(__b>=0xc0) { \
00493                 U8_MASK_LEAD_BYTE(__b, __count); \
00494                 (c)|=(UChar32)__b<<__shift; \
00495                 break; \
00496             } else { \
00497                 (c)|=(UChar32)(__b&0x3f)<<__shift; \
00498                 ++__count; \
00499                 __shift+=6; \
00500             } \
00501         } \
00502     } \
00503 }
00504 
00525 #define U8_PREV(s, start, i, c) { \
00526     (c)=(uint8_t)(s)[--(i)]; \
00527     if((c)>=0x80) { \
00528         if((c)<=0xbf) { \
00529             (c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \
00530         } else { \
00531             (c)=U_SENTINEL; \
00532         } \
00533     } \
00534 }
00535 
00547 #define U8_BACK_1_UNSAFE(s, i) { \
00548     while(U8_IS_TRAIL((s)[--(i)])) {} \
00549 }
00550 
00563 #define U8_BACK_1(s, start, i) { \
00564     if(U8_IS_TRAIL((s)[--(i)])) { \
00565         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00566     } \
00567 }
00568 
00582 #define U8_BACK_N_UNSAFE(s, i, n) { \
00583     int32_t __N=(n); \
00584     while(__N>0) { \
00585         U8_BACK_1_UNSAFE(s, i); \
00586         --__N; \
00587     } \
00588 }
00589 
00604 #define U8_BACK_N(s, start, i, n) { \
00605     int32_t __N=(n); \
00606     while(__N>0 && (i)>(start)) { \
00607         U8_BACK_1(s, start, i); \
00608         --__N; \
00609     } \
00610 }
00611 
00625 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00626     U8_BACK_1_UNSAFE(s, i); \
00627     U8_FWD_1_UNSAFE(s, i); \
00628 }
00629 
00645 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00646     if((start)<(i) && (i)<(length)) { \
00647         U8_BACK_1(s, start, i); \
00648         U8_FWD_1(s, i, length); \
00649     } \
00650 }
00651 
00652 #endif

Generated on Mon Aug 13 07:17:25 2007 for ICU 3.6 by  doxygen 1.5.2