101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2023
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file common/unicode_defines.h
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*
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* Defines used internally by the implementations of the Unicode routines
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*/
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#if !defined(UNICODE_DEFINES_H)
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#define UNICODE_DEFINES_H
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/**
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* Is this byte a valid UTF-8 continuation character?
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*/
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#define IS_VALID_CONTINUATION_CHAR(c) ((c) >= 0x80 && (c) < 0xc0)
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/**
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* Is this character one of the end-of-plane non-characters?
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*
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* These are U+xFFFE and U+xFFFF for x in (0..10}
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*/
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#define IS_PLANE_END_NON_CHARACTER(c32) (((c32) & 0xfffe) == 0xfffe)
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/**
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* Is this character one of the additional non-characters?
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*
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* 32 additional non-charactersare defined in the
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* "Arabic Presentation Forms-A" Unicode block */
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#define IS_ARABIC_NON_CHARACTER(c32) ((c32) >= 0xfdd0 && (c32) <= 0xfdef)
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// Invalid characters, based on UTF-8 decoding range
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//
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// By 'invalid' we mean characters that should not be encoded or
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// decoded when switching between UTF-8 and UTF-32
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//
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// See "UTF-8 decoder capability and stress test" Markus Kuhn 2015-08-28
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#define INVALID_UNICODE_0_TO_7F(c) (0) // No invalid characters
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#define INVALID_UNICODE_80_TO_7FF(c) (0) // No invalid characters
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#define INVALID_UNICODE_800_TO_FFFF(c) \
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(((c) >= 0xd800 && (c) <= 0xdfff) || /* Surrogate pairs */ \
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IS_ARABIC_NON_CHARACTER(c) || \
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IS_PLANE_END_NON_CHARACTER(c))
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#define INVALID_UNICODE_10000_TO_1FFFFF(c) \
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(IS_PLANE_END_NON_CHARACTER(c) || (c) > 0x10ffff)
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// Returns true for all 'invalid' Unicode chars
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#define INVALID_UNICODE(c) \
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( \
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INVALID_UNICODE_0_TO_7F(c) || \
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INVALID_UNICODE_80_TO_7FF(c) || \
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INVALID_UNICODE_800_TO_FFFF(c) || \
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INVALID_UNICODE_10000_TO_1FFFFF(c) \
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)
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/**
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* Is this character a UTF-16 high surrogate?
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*/
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#define IS_HIGH_SURROGATE(u16) (((u16) & 0xfc00) == 0xd800)
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/**
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* Is this character a UTF-16 low surrogate?
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*/
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#define IS_LOW_SURROGATE(u16) (((u16) & 0xfc00) == 0xdc00)
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/**
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* Extract the UTF-16 high surrogate from a character
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*/
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#define HIGH_SURROGATE_FROM_C32(c32) \
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(((((c32) - 0x10000) >> 10) & 0x3ff) | 0xd800)
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/**
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* Extract the UTF-16 low surrogate from a character
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*/
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#define LOW_SURROGATE_FROM_C32(c32) (((c32) & 0x3ff) | 0xdc00)
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/**
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* Reconstruct a character from a UTF-16 surrogate pair
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*
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* This macro cannot return values higher than 0x10ffff
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*/
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#define C32_FROM_SURROGATE_PAIR(low,high) \
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((char32_t)(((high) & 0x3ff) << 10) + ((low) & 0x3ff) + 0x10000)
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#endif // UNICODE_DEFINES_H
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