315 lines
9.2 KiB
C
315 lines
9.2 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: utf16.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999sep09
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* created by: Markus W. Scherer
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*/
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/**
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* \file
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* \brief C API: UTF-16 macros
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*
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* This file defines macros to deal with UTF-16 code units and code points.
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* "Safe" macros check for length overruns and illegal sequences, and
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* also for irregular sequences when the strict option is set.
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* "Unsafe" macros are designed for maximum speed.
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* utf16.h is included by utf.h after unicode/umachine.h
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* and some common definitions.
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*/
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#ifndef __UTF16_H__
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#define __UTF16_H__
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/* single-code point definitions -------------------------------------------- */
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/* handle surrogate pairs */
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#define UTF_IS_FIRST_SURROGATE(uchar) (((uchar)&0xfffffc00)==0xd800)
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#define UTF_IS_SECOND_SURROGATE(uchar) (((uchar)&0xfffffc00)==0xdc00)
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#define UTF_IS_SURROGATE_FIRST(c) (((c)&0x400)==0)
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/* get the UTF-32 value directly from the surrogate pseudo-characters */
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#define UTF_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
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#define UTF16_GET_PAIR_VALUE(first, second) \
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(((first)<<10UL)+(second)-UTF_SURROGATE_OFFSET)
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/* classes of code unit values */
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#define UTF16_IS_SINGLE(uchar) !UTF_IS_SURROGATE(uchar)
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#define UTF16_IS_LEAD(uchar) UTF_IS_FIRST_SURROGATE(uchar)
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#define UTF16_IS_TRAIL(uchar) UTF_IS_SECOND_SURROGATE(uchar)
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/* number of code units per code point */
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#define UTF16_NEED_MULTIPLE_UCHAR(c) ((uint32_t)(c)>0xffff)
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#define UTF16_CHAR_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2)
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#define UTF16_MAX_CHAR_LENGTH 2
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/* average number of code units compared to UTF-16 */
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#define UTF16_ARRAY_SIZE(size) (size)
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/*
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* Get a single code point from an offset that points to any
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* of the code units that belong to that code point.
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* Assume 0<=i<length.
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*
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* This could be used for iteration together with
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* UTF16_CHAR_LENGTH() and UTF_IS_ERROR(),
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* but the use of UTF16_NEXT_CHAR_[UN]SAFE() and
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* UTF16_PREV_CHAR_[UN]SAFE() is more efficient for that.
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*/
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#define UTF16_GET_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[i]; \
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if(UTF_IS_SURROGATE(c)) { \
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if(UTF_IS_SURROGATE_FIRST(c)) { \
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(c)=UTF16_GET_PAIR_VALUE((c), (s)[(i)+1]); \
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} else { \
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(c)=UTF16_GET_PAIR_VALUE((s)[(i)-1], (c)); \
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} \
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} \
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}
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#define UTF16_GET_CHAR_SAFE(s, start, i, length, c, strict) { \
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(c)=(s)[i]; \
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if(UTF_IS_SURROGATE(c)) { \
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uint16_t __c2; \
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if(UTF_IS_SURROGATE_FIRST(c)) { \
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if((i)+1<(length) && UTF_IS_SECOND_SURROGATE(__c2=(s)[(i)+1])) { \
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(c)=UTF16_GET_PAIR_VALUE((c), __c2); \
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/* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() */ \
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} else if(strict) {\
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/* unmatched first surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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} \
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} else { \
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if((i)>(start) && UTF_IS_FIRST_SURROGATE(__c2=(s)[(i)-1])) { \
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(c)=UTF16_GET_PAIR_VALUE(__c2, (c)); \
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/* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() */ \
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} else if(strict) {\
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/* unmatched second surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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} \
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} \
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/* else strict: (c)==0xfffe is caught by UTF_IS_ERROR() */ \
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} \
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}
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/* definitions with forward iteration --------------------------------------- */
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/*
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* all the macros that go forward assume that
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* the initial offset is 0<=i<length;
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* they update the offset
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*/
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/* fast versions, no error-checking */
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/*
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* Get a single code point from an offset that points to the first
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* of the code units that belong to that code point.
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* Assume 0<=i<length.
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*/
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#define UTF16_NEXT_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[(i)++]; \
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if(UTF_IS_FIRST_SURROGATE(c)) { \
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(c)=UTF16_GET_PAIR_VALUE((c), (s)[(i)++]); \
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} \
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}
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#define UTF16_APPEND_CHAR_UNSAFE(s, i, c) { \
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if((uint32_t)(c)<=0xffff) { \
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(s)[(i)++]=(uint16_t)(c); \
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} else { \
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(s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
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(s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
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} \
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}
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#define UTF16_FWD_1_UNSAFE(s, i) { \
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if(UTF_IS_FIRST_SURROGATE((s)[(i)++])) { \
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++(i); \
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} \
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}
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#define UTF16_FWD_N_UNSAFE(s, i, n) { \
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UTextOffset __N=(n); \
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while(__N>0) { \
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UTF16_FWD_1_UNSAFE(s, i); \
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--__N; \
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} \
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}
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/*
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* Set a random-access offset and adjust it so that
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* it points to the beginning of a Unicode character.
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* The offset that is passed in points to
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* any code unit of a code point
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* and will point to the first code unit after
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* the macro invocation.
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* Never increments the offset.
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*/
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#define UTF16_SET_CHAR_START_UNSAFE(s, i) { \
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if(UTF_IS_SECOND_SURROGATE((s)[i])) { \
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--(i); \
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} \
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}
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/* safe versions with error-checking and optional regularity-checking */
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#define UTF16_NEXT_CHAR_SAFE(s, i, length, c, strict) { \
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(c)=(s)[(i)++]; \
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if(UTF_IS_FIRST_SURROGATE(c)) { \
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uint16_t __c2; \
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if((i)<(length) && UTF_IS_SECOND_SURROGATE(__c2=(s)[(i)])) { \
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++(i); \
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(c)=UTF16_GET_PAIR_VALUE((c), __c2); \
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/* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() */ \
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} else if(strict) {\
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/* unmatched first surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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} \
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} else if(strict && UTF_IS_SECOND_SURROGATE(c)) { \
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/* unmatched second surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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/* else strict: (c)==0xfffe is caught by UTF_IS_ERROR() */ \
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} \
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}
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#define UTF16_APPEND_CHAR_SAFE(s, i, length, c) { \
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if((uint32_t)(c)<=0xffff) { \
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(s)[(i)++]=(uint16_t)(c); \
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} else if((uint32_t)(c)<=0x10ffff) { \
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if((i)+1<(length)) { \
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(s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
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(s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
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} else /* not enough space */ { \
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(s)[(i)++]=UTF_ERROR_VALUE; \
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} \
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} else /* c>0x10ffff, write error value */ { \
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(s)[(i)++]=UTF_ERROR_VALUE; \
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} \
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}
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#define UTF16_FWD_1_SAFE(s, i, length) { \
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if(UTF_IS_FIRST_SURROGATE((s)[(i)++]) && (i)<(length) && UTF_IS_SECOND_SURROGATE((s)[i])) { \
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++(i); \
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} \
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}
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#define UTF16_FWD_N_SAFE(s, i, length, n) { \
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UTextOffset __N=(n); \
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while(__N>0 && (i)<(length)) { \
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UTF16_FWD_1_SAFE(s, i, length); \
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--__N; \
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} \
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}
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#define UTF16_SET_CHAR_START_SAFE(s, start, i) { \
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if(UTF_IS_SECOND_SURROGATE((s)[i]) && (i)>(start) && UTF_IS_FIRST_SURROGATE((s)[(i)-1])) { \
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--(i); \
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} \
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}
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/* definitions with backward iteration -------------------------------------- */
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/*
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* all the macros that go backward assume that
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* the valid buffer range starts at offset 0
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* and that the initial offset is 0<i<=length;
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* they update the offset
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*/
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/* fast versions, no error-checking */
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/*
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* Get a single code point from an offset that points behind the last
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* of the code units that belong to that code point.
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* Assume 0<=i<length.
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*/
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#define UTF16_PREV_CHAR_UNSAFE(s, i, c) { \
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(c)=(s)[--(i)]; \
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if(UTF_IS_SECOND_SURROGATE(c)) { \
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(c)=UTF16_GET_PAIR_VALUE((s)[--(i)], (c)); \
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} \
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}
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#define UTF16_BACK_1_UNSAFE(s, i) { \
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if(UTF_IS_SECOND_SURROGATE((s)[--(i)])) { \
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--(i); \
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} \
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}
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#define UTF16_BACK_N_UNSAFE(s, i, n) { \
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UTextOffset __N=(n); \
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while(__N>0) { \
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UTF16_BACK_1_UNSAFE(s, i); \
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--__N; \
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} \
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}
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/*
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* Set a random-access offset and adjust it so that
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* it points after the end of a Unicode character.
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* The offset that is passed in points behind
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* any code unit of a code point
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* and will point behind the last code unit after
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* the macro invocation.
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* Never decrements the offset.
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*/
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#define UTF16_SET_CHAR_LIMIT_UNSAFE(s, i) { \
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if(UTF_IS_FIRST_SURROGATE((s)[(i)-1])) { \
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++(i); \
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} \
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}
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/* safe versions with error-checking and optional regularity-checking */
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#define UTF16_PREV_CHAR_SAFE(s, start, i, c, strict) { \
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(c)=(s)[--(i)]; \
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if(UTF_IS_SECOND_SURROGATE(c)) { \
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uint16_t __c2; \
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if((i)>(start) && UTF_IS_FIRST_SURROGATE(__c2=(s)[(i)-1])) { \
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--(i); \
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(c)=UTF16_GET_PAIR_VALUE(__c2, (c)); \
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/* strict: ((c)&0xfffe)==0xfffe is caught by UTF_IS_ERROR() */ \
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} else if(strict) {\
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/* unmatched second surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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} \
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} else if(strict && UTF_IS_FIRST_SURROGATE(c)) { \
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/* unmatched first surrogate */ \
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(c)=UTF_ERROR_VALUE; \
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/* else strict: (c)==0xfffe is caught by UTF_IS_ERROR() */ \
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} \
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}
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#define UTF16_BACK_1_SAFE(s, start, i) { \
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if(UTF_IS_SECOND_SURROGATE((s)[--(i)]) && (i)>(start) && UTF_IS_FIRST_SURROGATE((s)[(i)-1])) { \
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--(i); \
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} \
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}
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#define UTF16_BACK_N_SAFE(s, start, i, n) { \
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UTextOffset __N=(n); \
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while(__N>0 && (i)>(start)) { \
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UTF16_BACK_1_SAFE(s, start, i); \
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--__N; \
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} \
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}
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#define UTF16_SET_CHAR_LIMIT_SAFE(s, start, i, length) { \
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if((start)<(i) && (i)<(length) && UTF_IS_FIRST_SURROGATE((s)[(i)-1]) && UTF_IS_SECOND_SURROGATE((s)[i])) { \
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++(i); \
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} \
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}
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#endif
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