| /* |
| ******************************************************************************* |
| * |
| * Copyright (C) 1999-2000, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ******************************************************************************* |
| * file name: utf8.h |
| * encoding: US-ASCII |
| * tab size: 8 (not used) |
| * indentation:4 |
| * |
| * created on: 1999sep13 |
| * created by: Markus W. Scherer |
| * |
| * This file defines macros to deal with UTF-8 code units and code points. |
| * Signatures and semantics are the same as for the similarly named macros |
| * in utf16.h. |
| * utf8.h is included by utf.h after unicode/umachine.h |
| * and some common definitions. |
| */ |
| |
| #ifndef __UTF8_H__ |
| #define __UTF8_H__ |
| |
| /* internal definitions ----------------------------------------------------- */ |
| |
| U_CAPI uint8_t U_EXPORT2 |
| utf8_countTrailBytes[256]; |
| |
| /* |
| * Count the trail bytes for a lead byte - |
| * this macro should be used so that the assembler code |
| * that is mentioned in utf_impl.c could be used here. |
| */ |
| #define UTF8_COUNT_TRAIL_BYTES(leadByte) (utf8_countTrailBytes[(uint8_t)leadByte]) |
| |
| /* use a macro here, too - there may be a simpler way with some machines */ |
| #define UTF8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1) |
| |
| U_CAPI UChar32 U_EXPORT2 |
| utf8_nextCharSafeBody(const uint8_t *s, UTextOffset *pi, UTextOffset length, UChar32 c, bool_t strict); |
| |
| U_CAPI UTextOffset U_EXPORT2 |
| utf8_appendCharSafeBody(uint8_t *s, UTextOffset i, UTextOffset length, UChar32 c); |
| |
| U_CAPI UChar32 U_EXPORT2 |
| utf8_prevCharSafeBody(const uint8_t *s, UTextOffset *pi, UChar32 c, bool_t strict); |
| |
| U_CAPI UTextOffset U_EXPORT2 |
| utf8_back1SafeBody(const uint8_t *s, UTextOffset i); |
| |
| /* |
| * For the semantics of all of these macros, see utf16.h. |
| * The UTF-8 macros favor sequences more the shorter they are. |
| * Sometimes, only the single-byte case is covered by a macro, |
| * while longer sequences are handled by a function call. |
| */ |
| |
| /* single-code point definitions -------------------------------------------- */ |
| |
| /* classes of code unit values */ |
| #define UTF8_IS_SINGLE(uchar) ((uchar)&0x80==0) |
| #define UTF8_IS_LEAD(uchar) ((uchar)>=0xc0) |
| #define UTF8_IS_TRAIL(uchar) ((uchar)&0xc0==0x80) |
| |
| /* number of code units per code point */ |
| #define UTF8_NEED_MULTIPLE_UCHAR(c) ((uint32_t)(c)>0x7f) |
| |
| /* |
| * ICU does not deal with code points >0x10ffff |
| * unless necessary for advancing in the byte stream. |
| */ |
| #if 1 |
| # define UTF8_CHAR_LENGTH(c) \ |
| ((uint32_t)(c)<=0x7f ? 1 : \ |
| ((uint32_t)(c)<=0x7ff ? 2 : \ |
| ((uint32_t)(c)<=0xffff ? 3 : 4) \ |
| ) \ |
| ) |
| #else |
| /* this has an illegal branch for 7 bytes to be consistent with UTF8_COUNT_TRAIL_BYTES() */ |
| # define UTF8_CHAR_LENGTH(c) \ |
| ((uint32_t)(c)<=0x7f ? 1 : \ |
| ((uint32_t)(c)<=0x7ff ? 2 : \ |
| ((uint32_t)(c)<=0xffff ? 3 : \ |
| ((uint32_t)(c)<=0x10ffff ? 4 : \ |
| ((uint32_t)(c)<=0x3ffffff ? 5 : \ |
| ((uint32_t)(c)<=0x7fffffff ? 6 : 7) \ |
| ) \ |
| ) \ |
| ) \ |
| ) \ |
| ) |
| #endif |
| |
| #define UTF8_MAX_CHAR_LENGTH 4 |
| |
| /* average number of code units compared to UTF-16 */ |
| #define UTF8_ARRAY_SIZE(size) ((5*(size))/2) |
| |
| #define UTF8_GET_CHAR_UNSAFE(s, i, c) { \ |
| UTextOffset I=(UTextOffset)(i); \ |
| UTF8_SET_CHAR_START_UNSAFE(s, I); \ |
| UTF8_NEXT_CHAR_UNSAFE(s, I, c); \ |
| } |
| |
| #define UTF8_GET_CHAR_SAFE(s, i, length, c, strict) { \ |
| UTextOffset I=(UTextOffset)(i); \ |
| UTF8_SET_CHAR_START_SAFE(s, I); \ |
| UTF8_NEXT_CHAR_SAFE(s, I, length, c, strict); \ |
| } |
| |
| /* definitions with forward iteration --------------------------------------- */ |
| |
| /* |
| * Read a Unicode scalar value from an array of UTF-8 bytes. |
| * Only values <=0x10ffff are accepted, and if an error occurs, |
| * then c will be set such that UTF_IS_ERROR(c). |
| * The _UNSAFE macro is fast and does not check for errors. |
| * The _SAFE macro checks for errors and optionally for |
| * irregular sequences, too, i.e., for sequences that |
| * are longer than necessary, such as <c0 80> instead of <0>. |
| * The strict checks also check for surrogates and |
| * for 0xXXXXfffe and 0xXXXXffff. |
| */ |
| #define UTF8_NEXT_CHAR_UNSAFE(s, i, c) { \ |
| (c)=(s)[(i)++]; \ |
| if((c)&0x80) { \ |
| uint8_t count=UTF8_COUNT_TRAIL_BYTES(c); \ |
| UTF8_MASK_LEAD_BYTE(c, count); \ |
| switch(count) { \ |
| /* each following branch falls through to the next one */ \ |
| case 3: \ |
| (c)=((c)<<6)|((s)[(i)++]&0x3f); \ |
| case 2: \ |
| (c)=((c)<<6)|((s)[(i)++]&0x3f); \ |
| case 1: \ |
| (c)=((c)<<6)|((s)[(i)++]&0x3f); \ |
| /* no other branches to optimize switch() */ \ |
| break; \ |
| } \ |
| } \ |
| } |
| |
| #define UTF8_APPEND_CHAR_UNSAFE(s, i, c) { \ |
| if((uint32_t)(c)<=0x7f) { \ |
| (s)[(i)++]=(uint8_t)(c); \ |
| } else { \ |
| if((uint32_t)(c)<=0x7ff) { \ |
| (s)[(i)++]=(uint8_t)((c)>>6)|0xc0; \ |
| } else { \ |
| if((uint32_t)(c)<=0xffff) { \ |
| (s)[(i)++]=(uint8_t)((c)>>12)|0xe0; \ |
| } else { \ |
| (s)[(i)++]=(uint8_t)((c)>>18)|0xf0; \ |
| (s)[(i)++]=(uint8_t)((c)>>12)&0x3f|0x80; \ |
| } \ |
| (s)[(i)++]=(uint8_t)((c)>>6)&0x3f|0x80; \ |
| } \ |
| (s)[(i)++]=(uint8_t)(c)&0x3f|0x80; \ |
| } \ |
| } |
| |
| #define UTF8_FWD_1_UNSAFE(s, i) { \ |
| (i)+=1+UTF8_COUNT_TRAIL_BYTES((s)[i]); \ |
| } |
| |
| #define UTF8_FWD_N_UNSAFE(s, i, n) { \ |
| UTextOffset N=(n); \ |
| while(N>0) { \ |
| UTF8_FWD_1_UNSAFE(s, i); \ |
| --N; \ |
| } \ |
| } |
| |
| #define UTF8_SET_CHAR_START_UNSAFE(s, i) { \ |
| while(UTF8_IS_TRAIL((s)[i])) { --(i); } \ |
| } |
| |
| #define UTF8_NEXT_CHAR_SAFE(s, i, length, c, strict) { \ |
| (c)=(s)[(i)++]; \ |
| if((c)&0x80) { \ |
| (c)=utf8_nextCharSafeBody(s, &(i), (UTextOffset)(length), c, strict); \ |
| } \ |
| } |
| |
| #define UTF8_APPEND_CHAR_SAFE(s, i, length, c) { \ |
| if((uint32_t)(c)<=0x7f) { \ |
| (s)[(i)++]=(uint8_t)(c); \ |
| } else { \ |
| (i)=utf8_appendCharSafeBody(s, (UTextOffset)(i), (UTextOffset)(length), c); \ |
| } \ |
| } |
| |
| #define UTF8_FWD_1_SAFE(s, i, length) { \ |
| if((i)<(length)) { \ |
| uint8_t b=(s)[(i)++]; \ |
| if(b&0x80) { \ |
| uint8_t count=UTF8_COUNT_TRAIL_BYTES(b); \ |
| if((i)+count>(length)) { \ |
| count=(length)-(i); \ |
| } \ |
| while(count>0 && UTF8_IS_TRAIL((s)[i])) { \ |
| ++(i); \ |
| --count; \ |
| } \ |
| } \ |
| } \ |
| } |
| |
| #define UTF8_FWD_N_SAFE(s, i, length, n) { \ |
| UTextOffset N=(n); \ |
| while(N>0 && (i)<(length)) { \ |
| UTF8_FWD_1_SAFE(s, i, length); \ |
| --N; \ |
| } \ |
| } |
| |
| #define UTF8_SET_CHAR_START_SAFE(s, i) { \ |
| if((s)[(i)]&0x80) { \ |
| (i)=utf8_back1SafeBody(s, (UTextOffset)(i)); \ |
| } \ |
| } |
| |
| /* definitions with backward iteration -------------------------------------- */ |
| |
| #define UTF8_PREV_CHAR_UNSAFE(s, i, c) { \ |
| (c)=(s)[--(i)]; \ |
| if((c)&0x80) { \ |
| uint8_t b, count=1, shift=6; \ |
| \ |
| /* c must be a trail byte */ \ |
| (c)&=0x3f; \ |
| for(;;) { \ |
| b=(s)[--(i)]; \ |
| if(b>=0xc0) { \ |
| UTF8_MASK_LEAD_BYTE(b, count); \ |
| (c)|=(UChar32)b<<shift; \ |
| break; \ |
| } else { \ |
| (c)|=(UChar32)(b&0x3f)<<shift; \ |
| ++count; \ |
| shift+=6; \ |
| } \ |
| } \ |
| } \ |
| } |
| |
| #define UTF8_BACK_1_UNSAFE(s, i) { \ |
| while(UTF8_IS_TRAIL((s)[--(i)])) {} \ |
| } |
| |
| #define UTF8_BACK_N_UNSAFE(s, i, n) { \ |
| UTextOffset N=(n); \ |
| while(N>0) { \ |
| UTF8_BACK_1_UNSAFE(s, i); \ |
| --N; \ |
| } \ |
| } |
| |
| #define UTF8_SET_CHAR_LIMIT_UNSAFE(s, i) { \ |
| UTF8_BACK_1_UNSAFE(s, i); \ |
| UTF8_FWD_1_UNSAFE(s, i); \ |
| } |
| |
| #define UTF8_PREV_CHAR_SAFE(s, i, c, strict) { \ |
| (c)=(s)[--(i)]; \ |
| if((c)&0x80) { \ |
| (c)=utf8_prevCharSafeBody(s, &(i), c, strict); \ |
| } \ |
| } |
| |
| #define UTF8_BACK_1_SAFE(s, i) { \ |
| if((i)>0) { \ |
| --(i); \ |
| if((s)[(i)]&0x80) { \ |
| (i)=utf8_back1SafeBody(s, (UTextOffset)(i)); \ |
| } \ |
| } \ |
| } |
| |
| #define UTF8_BACK_N_SAFE(s, i, n) { \ |
| UTextOffset N=(n); \ |
| while(N>0 && (i)>0) { \ |
| UTF8_BACK_1_SAFE(s, i); \ |
| --N; \ |
| } \ |
| } |
| |
| #define UTF8_SET_CHAR_LIMIT_SAFE(s, i, length) { \ |
| UTF8_BACK_1_SAFE(s, i); \ |
| UTF8_FWD_1_SAFE(s, i, length); \ |
| } |
| |
| #endif |