utf8.h

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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 1999-2005, 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_INTERNAL const uint8_t 
00052 #elif defined(U_STATIC_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)=(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)=(s)[(i)++]; \
00254     if(((uint8_t)(c))>=0x80) { \
00255         if(U8_IS_LEAD(c)) { \
00256             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \
00257         } else { \
00258             (c)=U_SENTINEL; \
00259         } \
00260     } \
00261 }
00262 
00276 #define U8_APPEND_UNSAFE(s, i, c) { \
00277     if((uint32_t)(c)<=0x7f) { \
00278         (s)[(i)++]=(uint8_t)(c); \
00279     } else { \
00280         if((uint32_t)(c)<=0x7ff) { \
00281             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00282         } else { \
00283             if((uint32_t)(c)<=0xffff) { \
00284                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00285             } else { \
00286                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
00287                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
00288             } \
00289             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00290         } \
00291         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00292     } \
00293 }
00294 
00312 #define U8_APPEND(s, i, length, c, isError) { \
00313     if((uint32_t)(c)<=0x7f) { \
00314         (s)[(i)++]=(uint8_t)(c); \
00315     } else { \
00316         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(length), c, &(isError)); \
00317     } \
00318 }
00319 
00330 #define U8_FWD_1_UNSAFE(s, i) { \
00331     (i)+=1+U8_COUNT_TRAIL_BYTES((s)[i]); \
00332 }
00333 
00345 #define U8_FWD_1(s, i, length) { \
00346     uint8_t __b=(s)[(i)++]; \
00347     if(U8_IS_LEAD(__b)) { \
00348         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
00349         if((i)+__count>(length)) { \
00350             __count=(uint8_t)((length)-(i)); \
00351         } \
00352         while(__count>0 && U8_IS_TRAIL((s)[i])) { \
00353             ++(i); \
00354             --__count; \
00355         } \
00356     } \
00357 }
00358 
00371 #define U8_FWD_N_UNSAFE(s, i, n) { \
00372     int32_t __N=(n); \
00373     while(__N>0) { \
00374         U8_FWD_1_UNSAFE(s, i); \
00375         --__N; \
00376     } \
00377 }
00378 
00392 #define U8_FWD_N(s, i, length, n) { \
00393     int32_t __N=(n); \
00394     while(__N>0 && (i)<(length)) { \
00395         U8_FWD_1(s, i, length); \
00396         --__N; \
00397     } \
00398 }
00399 
00413 #define U8_SET_CP_START_UNSAFE(s, i) { \
00414     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00415 }
00416 
00431 #define U8_SET_CP_START(s, start, i) { \
00432     if(U8_IS_TRAIL((s)[(i)])) { \
00433         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00434     } \
00435 }
00436 
00437 /* definitions with backward iteration -------------------------------------- */
00438 
00458 #define U8_PREV_UNSAFE(s, i, c) { \
00459     (c)=(s)[--(i)]; \
00460     if(U8_IS_TRAIL(c)) { \
00461         uint8_t __b, __count=1, __shift=6; \
00462 \
00463         /* c is a trail byte */ \
00464         (c)&=0x3f; \
00465         for(;;) { \
00466             __b=(s)[--(i)]; \
00467             if(__b>=0xc0) { \
00468                 U8_MASK_LEAD_BYTE(__b, __count); \
00469                 (c)|=(UChar32)__b<<__shift; \
00470                 break; \
00471             } else { \
00472                 (c)|=(UChar32)(__b&0x3f)<<__shift; \
00473                 ++__count; \
00474                 __shift+=6; \
00475             } \
00476         } \
00477     } \
00478 }
00479 
00500 #define U8_PREV(s, start, i, c) { \
00501     (c)=(s)[--(i)]; \
00502     if((c)>=0x80) { \
00503         if((c)<=0xbf) { \
00504             (c)=utf8_prevCharSafeBody(s, start, &(i), c, -1); \
00505         } else { \
00506             (c)=U_SENTINEL; \
00507         } \
00508     } \
00509 }
00510 
00522 #define U8_BACK_1_UNSAFE(s, i) { \
00523     while(U8_IS_TRAIL((s)[--(i)])) {} \
00524 }
00525 
00538 #define U8_BACK_1(s, start, i) { \
00539     if(U8_IS_TRAIL((s)[--(i)])) { \
00540         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00541     } \
00542 }
00543 
00557 #define U8_BACK_N_UNSAFE(s, i, n) { \
00558     int32_t __N=(n); \
00559     while(__N>0) { \
00560         U8_BACK_1_UNSAFE(s, i); \
00561         --__N; \
00562     } \
00563 }
00564 
00579 #define U8_BACK_N(s, start, i, n) { \
00580     int32_t __N=(n); \
00581     while(__N>0 && (i)>(start)) { \
00582         U8_BACK_1(s, start, i); \
00583         --__N; \
00584     } \
00585 }
00586 
00600 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00601     U8_BACK_1_UNSAFE(s, i); \
00602     U8_FWD_1_UNSAFE(s, i); \
00603 }
00604 
00620 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00621     if((start)<(i) && (i)<(length)) { \
00622         U8_BACK_1(s, start, i); \
00623         U8_FWD_1(s, i, length); \
00624     } \
00625 }
00626 
00627 #endif

Generated on Tue Feb 28 01:37:40 2006 for ICU 3.4 by  doxygen 1.4.4