utf16.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:  utf16.h
00009 *   encoding:   US-ASCII
00010 *   tab size:   8 (not used)
00011 *   indentation:4
00012 *
00013 *   created on: 1999sep09
00014 *   created by: Markus W. Scherer
00015 */
00016 
00034 #ifndef __UTF16_H__
00035 #define __UTF16_H__
00036 
00037 /* utf.h must be included first. */
00038 #ifndef __UTF_H__
00039 #   include "unicode/utf.h"
00040 #endif
00041 
00042 /* single-code point definitions -------------------------------------------- */
00043 
00050 #define U16_IS_SINGLE(c) !U_IS_SURROGATE(c)
00051 
00058 #define U16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800)
00059 
00066 #define U16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00)
00067 
00074 #define U16_IS_SURROGATE(c) U_IS_SURROGATE(c)
00075 
00083 #define U16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0)
00084 
00089 #define U16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
00090 
00102 #define U16_GET_SUPPLEMENTARY(lead, trail) \
00103     (((UChar32)(lead)<<10UL)+(UChar32)(trail)-U16_SURROGATE_OFFSET)
00104 
00105 
00113 #define U16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)
00114 
00122 #define U16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)
00123 
00131 #define U16_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2)
00132 
00138 #define U16_MAX_LENGTH 2
00139 
00157 #define U16_GET_UNSAFE(s, i, c) { \
00158     (c)=(s)[i]; \
00159     if(U16_IS_SURROGATE(c)) { \
00160         if(U16_IS_SURROGATE_LEAD(c)) { \
00161             (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)+1]); \
00162         } else { \
00163             (c)=U16_GET_SUPPLEMENTARY((s)[(i)-1], (c)); \
00164         } \
00165     } \
00166 }
00167 
00188 #define U16_GET(s, start, i, length, c) { \
00189     (c)=(s)[i]; \
00190     if(U16_IS_SURROGATE(c)) { \
00191         uint16_t __c2; \
00192         if(U16_IS_SURROGATE_LEAD(c)) { \
00193             if((i)+1<(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
00194                 (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
00195             } \
00196         } else { \
00197             if((i)-1>=(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
00198                 (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
00199             } \
00200         } \
00201     } \
00202 }
00203 
00204 /* definitions with forward iteration --------------------------------------- */
00205 
00225 #define U16_NEXT_UNSAFE(s, i, c) { \
00226     (c)=(s)[(i)++]; \
00227     if(U16_IS_LEAD(c)) { \
00228         (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \
00229     } \
00230 }
00231 
00252 #define U16_NEXT(s, i, length, c) { \
00253     (c)=(s)[(i)++]; \
00254     if(U16_IS_LEAD(c)) { \
00255         uint16_t __c2; \
00256         if((i)<(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
00257             ++(i); \
00258             (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
00259         } \
00260     } \
00261 }
00262 
00276 #define U16_APPEND_UNSAFE(s, i, c) { \
00277     if((uint32_t)(c)<=0xffff) { \
00278         (s)[(i)++]=(uint16_t)(c); \
00279     } else { \
00280         (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
00281         (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
00282     } \
00283 }
00284 
00302 #define U16_APPEND(s, i, capacity, c, isError) { \
00303     if((uint32_t)(c)<=0xffff) { \
00304         (s)[(i)++]=(uint16_t)(c); \
00305     } else if((uint32_t)(c)<=0x10ffff && (i)+1<(capacity)) { \
00306         (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
00307         (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
00308     } else /* c>0x10ffff or not enough space */ { \
00309         (isError)=TRUE; \
00310     } \
00311 }
00312 
00323 #define U16_FWD_1_UNSAFE(s, i) { \
00324     if(U16_IS_LEAD((s)[(i)++])) { \
00325         ++(i); \
00326     } \
00327 }
00328 
00340 #define U16_FWD_1(s, i, length) { \
00341     if(U16_IS_LEAD((s)[(i)++]) && (i)<(length) && U16_IS_TRAIL((s)[i])) { \
00342         ++(i); \
00343     } \
00344 }
00345 
00358 #define U16_FWD_N_UNSAFE(s, i, n) { \
00359     int32_t __N=(n); \
00360     while(__N>0) { \
00361         U16_FWD_1_UNSAFE(s, i); \
00362         --__N; \
00363     } \
00364 }
00365 
00379 #define U16_FWD_N(s, i, length, n) { \
00380     int32_t __N=(n); \
00381     while(__N>0 && (i)<(length)) { \
00382         U16_FWD_1(s, i, length); \
00383         --__N; \
00384     } \
00385 }
00386 
00400 #define U16_SET_CP_START_UNSAFE(s, i) { \
00401     if(U16_IS_TRAIL((s)[i])) { \
00402         --(i); \
00403     } \
00404 }
00405 
00420 #define U16_SET_CP_START(s, start, i) { \
00421     if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
00422         --(i); \
00423     } \
00424 }
00425 
00426 /* definitions with backward iteration -------------------------------------- */
00427 
00448 #define U16_PREV_UNSAFE(s, i, c) { \
00449     (c)=(s)[--(i)]; \
00450     if(U16_IS_TRAIL(c)) { \
00451         (c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \
00452     } \
00453 }
00454 
00476 #define U16_PREV(s, start, i, c) { \
00477     (c)=(s)[--(i)]; \
00478     if(U16_IS_TRAIL(c)) { \
00479         uint16_t __c2; \
00480         if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
00481             --(i); \
00482             (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
00483         } \
00484     } \
00485 }
00486 
00498 #define U16_BACK_1_UNSAFE(s, i) { \
00499     if(U16_IS_TRAIL((s)[--(i)])) { \
00500         --(i); \
00501     } \
00502 }
00503 
00516 #define U16_BACK_1(s, start, i) { \
00517     if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
00518         --(i); \
00519     } \
00520 }
00521 
00535 #define U16_BACK_N_UNSAFE(s, i, n) { \
00536     int32_t __N=(n); \
00537     while(__N>0) { \
00538         U16_BACK_1_UNSAFE(s, i); \
00539         --__N; \
00540     } \
00541 }
00542 
00557 #define U16_BACK_N(s, start, i, n) { \
00558     int32_t __N=(n); \
00559     while(__N>0 && (i)>(start)) { \
00560         U16_BACK_1(s, start, i); \
00561         --__N; \
00562     } \
00563 }
00564 
00578 #define U16_SET_CP_LIMIT_UNSAFE(s, i) { \
00579     if(U16_IS_LEAD((s)[(i)-1])) { \
00580         ++(i); \
00581     } \
00582 }
00583 
00599 #define U16_SET_CP_LIMIT(s, start, i, length) { \
00600     if((start)<(i) && (i)<(length) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \
00601         ++(i); \
00602     } \
00603 }
00604 
00605 #endif

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