utf8.h

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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 1999-2012, 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 
00032 #ifndef __UTF8_H__
00033 #define __UTF8_H__
00034 
00035 #include "unicode/umachine.h"
00036 #ifndef __UTF_H__
00037 #   include "unicode/utf.h"
00038 #endif
00039 
00040 /* internal definitions ----------------------------------------------------- */
00041 
00053 #ifdef U_UTF8_IMPL
00054 U_EXPORT const uint8_t 
00055 #elif defined(U_STATIC_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION)
00056 U_CFUNC const uint8_t
00057 #else
00058 U_CFUNC U_IMPORT const uint8_t /* U_IMPORT2? */ /*U_IMPORT*/ 
00059 #endif
00060 utf8_countTrailBytes[256];
00061 
00080 #define U8_COUNT_TRAIL_BYTES(leadByte) \
00081     ((leadByte)<0xf0 ? \
00082         ((leadByte)>=0xc0)+((leadByte)>=0xe0) : \
00083         (leadByte)<0xfe ? 3+((leadByte)>=0xf8)+((leadByte)>=0xfc) : 0)
00084 
00096 #define U8_COUNT_TRAIL_BYTES_UNSAFE(leadByte) \
00097     (((leadByte)>=0xc0)+((leadByte)>=0xe0)+((leadByte)>=0xf0))
00098 
00106 #define U8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
00107 
00117 U_STABLE UChar32 U_EXPORT2
00118 utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict);
00119 
00129 U_STABLE int32_t U_EXPORT2
00130 utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError);
00131 
00141 U_STABLE UChar32 U_EXPORT2
00142 utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict);
00143 
00153 U_STABLE int32_t U_EXPORT2
00154 utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i);
00155 
00156 /* single-code point definitions -------------------------------------------- */
00157 
00164 #define U8_IS_SINGLE(c) (((c)&0x80)==0)
00165 
00172 #define U8_IS_LEAD(c) ((uint8_t)((c)-0xc0)<0x3e)
00173 
00180 #define U8_IS_TRAIL(c) (((c)&0xc0)==0x80)
00181 
00189 #define U8_LENGTH(c) \
00190     ((uint32_t)(c)<=0x7f ? 1 : \
00191         ((uint32_t)(c)<=0x7ff ? 2 : \
00192             ((uint32_t)(c)<=0xd7ff ? 3 : \
00193                 ((uint32_t)(c)<=0xdfff || (uint32_t)(c)>0x10ffff ? 0 : \
00194                     ((uint32_t)(c)<=0xffff ? 3 : 4)\
00195                 ) \
00196             ) \
00197         ) \
00198     )
00199 
00205 #define U8_MAX_LENGTH 4
00206 
00223 #define U8_GET_UNSAFE(s, i, c) { \
00224     int32_t _u8_get_unsafe_index=(int32_t)(i); \
00225     U8_SET_CP_START_UNSAFE(s, _u8_get_unsafe_index); \
00226     U8_NEXT_UNSAFE(s, _u8_get_unsafe_index, c); \
00227 }
00228 
00247 #define U8_GET(s, start, i, length, c) { \
00248     int32_t _u8_get_index=(int32_t)(i); \
00249     U8_SET_CP_START(s, start, _u8_get_index); \
00250     U8_NEXT(s, _u8_get_index, length, c); \
00251 }
00252 
00253 /* definitions with forward iteration --------------------------------------- */
00254 
00272 #define U8_NEXT_UNSAFE(s, i, c) { \
00273     (c)=(uint8_t)(s)[(i)++]; \
00274     if((c)>=0x80) { \
00275         if((c)<0xe0) { \
00276             (c)=(((c)&0x1f)<<6)|((s)[(i)++]&0x3f); \
00277         } else if((c)<0xf0) { \
00278             /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
00279             (c)=(UChar)(((c)<<12)|(((s)[i]&0x3f)<<6)|((s)[(i)+1]&0x3f)); \
00280             (i)+=2; \
00281         } else { \
00282             (c)=(((c)&7)<<18)|(((s)[i]&0x3f)<<12)|(((s)[(i)+1]&0x3f)<<6)|((s)[(i)+2]&0x3f); \
00283             (i)+=3; \
00284         } \
00285     } \
00286 }
00287 
00306 #define U8_NEXT(s, i, length, c) { \
00307     (c)=(uint8_t)(s)[(i)++]; \
00308     if((c)>=0x80) { \
00309         uint8_t __t1, __t2; \
00310         if( /* handle U+1000..U+CFFF inline */ \
00311             (0xe0<(c) && (c)<=0xec) && \
00312             (((i)+1)<(length)) && \
00313             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f && \
00314             (__t2=(uint8_t)((s)[(i)+1]-0x80))<= 0x3f \
00315         ) { \
00316             /* no need for (c&0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */ \
00317             (c)=(UChar)(((c)<<12)|(__t1<<6)|__t2); \
00318             (i)+=2; \
00319         } else if( /* handle U+0080..U+07FF inline */ \
00320             ((c)<0xe0 && (c)>=0xc2) && \
00321             ((i)<(length)) && \
00322             (__t1=(uint8_t)((s)[i]-0x80))<=0x3f \
00323         ) { \
00324             (c)=(UChar)((((c)&0x1f)<<6)|__t1); \
00325             ++(i); \
00326         } else if(U8_IS_LEAD(c)) { \
00327             /* function call for "complicated" and error cases */ \
00328             (c)=utf8_nextCharSafeBody((const uint8_t *)s, &(i), (int32_t)(length), c, -1); \
00329         } else { \
00330             (c)=U_SENTINEL; \
00331         } \
00332     } \
00333 }
00334 
00348 #define U8_APPEND_UNSAFE(s, i, c) { \
00349     if((uint32_t)(c)<=0x7f) { \
00350         (s)[(i)++]=(uint8_t)(c); \
00351     } else { \
00352         if((uint32_t)(c)<=0x7ff) { \
00353             (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00354         } else { \
00355             if((uint32_t)(c)<=0xffff) { \
00356                 (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00357             } else { \
00358                 (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); \
00359                 (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); \
00360             } \
00361             (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00362         } \
00363         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00364     } \
00365 }
00366 
00384 #define U8_APPEND(s, i, capacity, c, isError) { \
00385     if((uint32_t)(c)<=0x7f) { \
00386         (s)[(i)++]=(uint8_t)(c); \
00387     } else if((uint32_t)(c)<=0x7ff && (i)+1<(capacity)) { \
00388         (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); \
00389         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00390     } else if((uint32_t)(c)<=0xd7ff && (i)+2<(capacity)) { \
00391         (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); \
00392         (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); \
00393         (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); \
00394     } else { \
00395         (i)=utf8_appendCharSafeBody(s, (int32_t)(i), (int32_t)(capacity), c, &(isError)); \
00396     } \
00397 }
00398 
00409 #define U8_FWD_1_UNSAFE(s, i) { \
00410     (i)+=1+U8_COUNT_TRAIL_BYTES_UNSAFE((uint8_t)(s)[i]); \
00411 }
00412 
00424 #define U8_FWD_1(s, i, length) { \
00425     uint8_t __b=(uint8_t)(s)[(i)++]; \
00426     if(U8_IS_LEAD(__b)) { \
00427         uint8_t __count=U8_COUNT_TRAIL_BYTES(__b); \
00428         if((i)+__count>(length)) { \
00429             __count=(uint8_t)((length)-(i)); \
00430         } \
00431         while(__count>0 && U8_IS_TRAIL((s)[i])) { \
00432             ++(i); \
00433             --__count; \
00434         } \
00435     } \
00436 }
00437 
00450 #define U8_FWD_N_UNSAFE(s, i, n) { \
00451     int32_t __N=(n); \
00452     while(__N>0) { \
00453         U8_FWD_1_UNSAFE(s, i); \
00454         --__N; \
00455     } \
00456 }
00457 
00471 #define U8_FWD_N(s, i, length, n) { \
00472     int32_t __N=(n); \
00473     while(__N>0 && (i)<(length)) { \
00474         U8_FWD_1(s, i, length); \
00475         --__N; \
00476     } \
00477 }
00478 
00492 #define U8_SET_CP_START_UNSAFE(s, i) { \
00493     while(U8_IS_TRAIL((s)[i])) { --(i); } \
00494 }
00495 
00510 #define U8_SET_CP_START(s, start, i) { \
00511     if(U8_IS_TRAIL((s)[(i)])) { \
00512         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00513     } \
00514 }
00515 
00516 /* definitions with backward iteration -------------------------------------- */
00517 
00537 #define U8_PREV_UNSAFE(s, i, c) { \
00538     (c)=(uint8_t)(s)[--(i)]; \
00539     if(U8_IS_TRAIL(c)) { \
00540         uint8_t __b, __count=1, __shift=6; \
00541 \
00542         /* c is a trail byte */ \
00543         (c)&=0x3f; \
00544         for(;;) { \
00545             __b=(uint8_t)(s)[--(i)]; \
00546             if(__b>=0xc0) { \
00547                 U8_MASK_LEAD_BYTE(__b, __count); \
00548                 (c)|=(UChar32)__b<<__shift; \
00549                 break; \
00550             } else { \
00551                 (c)|=(UChar32)(__b&0x3f)<<__shift; \
00552                 ++__count; \
00553                 __shift+=6; \
00554             } \
00555         } \
00556     } \
00557 }
00558 
00579 #define U8_PREV(s, start, i, c) { \
00580     (c)=(uint8_t)(s)[--(i)]; \
00581     if((c)>=0x80) { \
00582         if((c)<=0xbf) { \
00583             (c)=utf8_prevCharSafeBody((const uint8_t *)s, start, &(i), c, -1); \
00584         } else { \
00585             (c)=U_SENTINEL; \
00586         } \
00587     } \
00588 }
00589 
00601 #define U8_BACK_1_UNSAFE(s, i) { \
00602     while(U8_IS_TRAIL((s)[--(i)])) {} \
00603 }
00604 
00617 #define U8_BACK_1(s, start, i) { \
00618     if(U8_IS_TRAIL((s)[--(i)])) { \
00619         (i)=utf8_back1SafeBody(s, start, (int32_t)(i)); \
00620     } \
00621 }
00622 
00636 #define U8_BACK_N_UNSAFE(s, i, n) { \
00637     int32_t __N=(n); \
00638     while(__N>0) { \
00639         U8_BACK_1_UNSAFE(s, i); \
00640         --__N; \
00641     } \
00642 }
00643 
00658 #define U8_BACK_N(s, start, i, n) { \
00659     int32_t __N=(n); \
00660     while(__N>0 && (i)>(start)) { \
00661         U8_BACK_1(s, start, i); \
00662         --__N; \
00663     } \
00664 }
00665 
00679 #define U8_SET_CP_LIMIT_UNSAFE(s, i) { \
00680     U8_BACK_1_UNSAFE(s, i); \
00681     U8_FWD_1_UNSAFE(s, i); \
00682 }
00683 
00699 #define U8_SET_CP_LIMIT(s, start, i, length) { \
00700     if((start)<(i) && (i)<(length)) { \
00701         U8_BACK_1(s, start, i); \
00702         U8_FWD_1(s, i, length); \
00703     } \
00704 }
00705 
00706 #endif

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