44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
// Copyright 2018 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/cfx_utf8encoder.h"
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CFX_UTF8Encoder::CFX_UTF8Encoder() = default;
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CFX_UTF8Encoder::~CFX_UTF8Encoder() = default;
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void CFX_UTF8Encoder::Input(wchar_t unicodeAsWchar) {
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uint32_t unicode = static_cast<uint32_t>(unicodeAsWchar);
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if (unicode < 0x80) {
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m_Buffer.push_back(unicode);
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} else {
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if (unicode >= 0x80000000)
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return;
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int nbytes = 0;
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if (unicode < 0x800)
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nbytes = 2;
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else if (unicode < 0x10000)
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nbytes = 3;
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else if (unicode < 0x200000)
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nbytes = 4;
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else if (unicode < 0x4000000)
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nbytes = 5;
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else
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nbytes = 6;
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static const uint8_t prefix[] = {0xc0, 0xe0, 0xf0, 0xf8, 0xfc};
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int order = 1 << ((nbytes - 1) * 6);
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int code = unicodeAsWchar;
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m_Buffer.push_back(prefix[nbytes - 2] | (code / order));
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for (int i = 0; i < nbytes - 1; i++) {
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code = code % order;
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order >>= 6;
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m_Buffer.push_back(0x80 | (code / order));
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}
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}
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}
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