55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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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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// Routine that maps a Unicode code point to an interchange-valid one
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//
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#include "fixunicodevalue.h"
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#include "integral_types.h"
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namespace CLD2 {
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// Guarantees that the resulting output value is interchange valid
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// 00-FF; map to spaces or MS CP1252
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// D800-DFFF; surrogates
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// FDD0-FDEF; non-characters
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// xxFFFE-xxFFFF; non-characters
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char32 FixUnicodeValue(char32 uv) {
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uint32 uuv = static_cast<uint32>(uv);
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if (uuv < 0x0100) {
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return kMapFullMicrosoft1252OrSpace[uuv];
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}
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if (uuv < 0xD800) {
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return uv;
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}
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if ((uuv & ~0x0F) == 0xFDD0) { // non-characters
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return 0xFFFD;
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}
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if ((uuv & ~0x0F) == 0xFDE0) { // non-characters
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return 0xFFFD;
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}
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if ((uuv & 0x00FFFE) == 0xFFFE) { // non-characters
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return 0xFFFD;
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}
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if ((0xE000 <= uuv) && (uuv <= 0x10FFFF)) {
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return uv;
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}
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// surrogates and negative and > 0x10FFFF all land here
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return 0xFFFD;
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}
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} // End namespace CLD2
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