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utf8.h

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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 1999-2003, 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 /* utf.h must be included first. */
00035 #ifndef __UTF_H__
00036 #   include "unicode/utf.h"
00037 #endif
00038 
00039 #ifndef __UTF8_H__
00040 #define __UTF8_H__
00041 
00042 /* internal definitions ----------------------------------------------------- */
00043 
00050 #ifdef U_UTF8_IMPL
00051 U_CAPI const uint8_t 
00052 utf8_countTrailBytes[256];
00053 #else
00054 U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/ 
00055 utf8_countTrailBytes[256];
00056 #endif
00057 
00062 #define U8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte])
00063 
00068 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
00069 
00074 U_CAPI UChar32 U_EXPORT2
00075 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
00076 
00081 U_CAPI int32_t U_EXPORT2
00082 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
00083 
00088 U_CAPI UChar32 U_EXPORT2
00089 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
00090 
00095 U_CAPI int32_t U_EXPORT2
00096 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
00097 
00098 /* single-code point definitions -------------------------------------------- */
00099 
00106 #define U8_IS_SINGLE(c) (((c)&0x80)==0)
00107 
00114 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)
00115 
00122 #define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)
00123 
00131 #define U8_LENGTH(c) \
00132     ((uint32_t)(c)<=0x7f ? 1 : \
00133         ((uint32_t)(c)<=0x7ff ? 2 : \
00134             ((uint32_t)(c)<=0xd7ff ? 3 : \
00135                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
00136                     ((uint32_t)(c)<=0xffff ? 3 : 4)\
00137                 ) \
00138             ) \
00139         ) \
00140     )
00141 
00147 #define U8_MAX_LENGTH 4
00148 
00165 #define U8_GET_UNSAFE(s, i, c) { \
00166     int32_t __I=(int32_t)(i); \
00167     U8_SET_CP_START_UNSAFE(s, __I); \
00168     U8_NEXT_UNSAFE(s, __I, c); \
00169 }
00170 
00189 #define U8_GET(s, start, i, length, c) { \
00190     int32_t __I=(int32_t)(i); \
00191     U8_SET_CP_START(s, start, __I); \
00192     U8_NEXT(s, __I, length, c); \
00193 }
00194 
00195 /* definitions with forward iteration --------------------------------------- */
00196 
00214 #define U8_NEXT_UNSAFE(s, i, c) { \
00215     (c)=(s)[(i)++]; \
00216     if((uint8_t)((c)-0xc0)<0x35) { \
00217         uint8_t __count=U8_COUNT_TRAIL_BYTES(c); \
00218         U8_MASK_LEAD_BYTE(c, __count); \
00219         switch(__count) { \
00220         /* each following branch falls through to the next one */ \
00221         case 3: \
00222             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00223         case 2: \
00224             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00225         case 1: \
00226             (c)=((c)<<6)|((s)[(i)++]&0x3f); \
00227         /* no other branches to optimize switch() */ \
00228             break; \
00229         } \
00230     } \
00231 }
00232 
00251 #define U8_NEXT(s, i, length, c) { \
00252     (c)=(s)[(i)++]; \
00253     if(((uint8_t)(c))>=0x80) { \
00254         if(U8_IS_LEAD(c)) { \
00255             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \
00256         } else { \
00257             (c)=U_SENTINEL; \
00258         } \
00259     } \
00260 }
00261 
00275 #define U8_APPEND_UNSAFE(s, i, c) { \
00276     if((uint32_t)(c)<=0x7f) { \
00277         (s)[(i)++]=(uint8_t)(c); \
00278     } else { \
00279         if((uint32_t)(c)<=0x7ff) { \
00280             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00281         } else { \
00282             if((uint32_t)(c)<=0xffff) { \
00283                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00284             } else { \
00285                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
00286                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
00287             } \
00288             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00289         } \
00290         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00291     } \
00292 }
00293 
00311 #define U8_APPEND(s, i, length, c, isError) { \
00312     if((uint32_t)(c)<=0x7f) { \
00313         (s)[(i)++]=(uint8_t)(c); \
00314     } else { \
00315         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(length), c, &(isError)); \
00316     } \
00317 }
00318 
00329 #define U8_FWD_1_UNSAFE(s, i) { \
00330     (i)+=1+U8_COUNT_TRAIL_BYTES((s)[i]); \
00331 }
00332 
00344 #define U8_FWD_1(s, i, length) { \
00345     uint8_t __b=(s)[(i)++]; \
00346     if(U8_IS_LEAD(__b)) { \
00347         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
00348         if((i)+__count>(length)) { \
00349             __count=(uint8_t)((length)-(i)); \
00350         } \
00351         while(__count>0 && U8_IS_TRAIL((s)[i])) { \
00352             ++(i); \
00353             --__count; \
00354         } \
00355     } \
00356 }
00357 
00370 #define U8_FWD_N_UNSAFE(s, i, n) { \
00371     int32_t __N=(n); \
00372     while(__N>0) { \
00373         U8_FWD_1_UNSAFE(s, i); \
00374         --__N; \
00375     } \
00376 }
00377 
00391 #define U8_FWD_N(s, i, length, n) { \
00392     int32_t __N=(n); \
00393     while(__N>0 && (i)<(length)) { \
00394         U8_FWD_1(s, i, length); \
00395         --__N; \
00396     } \
00397 }
00398 
00412 #define U8_SET_CP_START_UNSAFE(s, i) { \
00413     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00414 }
00415 
00430 #define U8_SET_CP_START(s, start, i) { \
00431     if(U8_IS_TRAIL((s)[(i)])) { \
00432         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00433     } \
00434 }
00435 
00436 /* definitions with backward iteration -------------------------------------- */
00437 
00457 #define U8_PREV_UNSAFE(s, i, c) { \
00458     (c)=(s)[--(i)]; \
00459     if(U8_IS_TRAIL(c)) { \
00460         uint8_t __b, __count=1, __shift=6; \
00461 \
00462         /* c is a trail byte */ \
00463         (c)&=0x3f; \
00464         for(;;) { \
00465             __b=(s)[--(i)]; \
00466             if(__b>=0xc0) { \
00467                 U8_MASK_LEAD_BYTE(__b, __count); \
00468                 (c)|=(UChar32)__b<<__shift; \
00469                 break; \
00470             } else { \
00471                 (c)|=(UChar32)(__b&0x3f)<<__shift; \
00472                 ++__count; \
00473                 __shift+=6; \
00474             } \
00475         } \
00476     } \
00477 }
00478 
00499 #define U8_PREV(s, start, i, c) { \
00500     (c)=(s)[--(i)]; \
00501     if((c)>=0x80) { \
00502         if((c)<=0xbf) { \
00503             (c)=utf8_prevCharSafeBody(s, start, &(i), c, -1); \
00504         } else { \
00505             (c)=U_SENTINEL; \
00506         } \
00507     } \
00508 }
00509 
00521 #define U8_BACK_1_UNSAFE(s, i) { \
00522     while(U8_IS_TRAIL((s)[--(i)])) {} \
00523 }
00524 
00537 #define U8_BACK_1(s, start, i) { \
00538     if(U8_IS_TRAIL((s)[--(i)])) { \
00539         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00540     } \
00541 }
00542 
00556 #define U8_BACK_N_UNSAFE(s, i, n) { \
00557     int32_t __N=(n); \
00558     while(__N>0) { \
00559         U8_BACK_1_UNSAFE(s, i); \
00560         --__N; \
00561     } \
00562 }
00563 
00578 #define U8_BACK_N(s, start, i, n) { \
00579     int32_t __N=(n); \
00580     while(__N>0 && (i)>(start)) { \
00581         U8_BACK_1(s, start, i); \
00582         --__N; \
00583     } \
00584 }
00585 
00599 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00600     U8_BACK_1_UNSAFE(s, i); \
00601     U8_FWD_1_UNSAFE(s, i); \
00602 }
00603 
00619 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00620     if((start)<(i) && (i)<(length)) { \
00621         U8_BACK_1(s, start, i); \
00622         U8_FWD_1(s, i, length); \
00623     } \
00624 }
00625 
00626 #endif

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