49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
// Copyright 2017 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_utf8decoder.h"
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CFX_UTF8Decoder::CFX_UTF8Decoder() = default;
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CFX_UTF8Decoder::~CFX_UTF8Decoder() = default;
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void CFX_UTF8Decoder::AppendCodePoint(uint32_t ch) {
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m_Buffer.AppendChar(static_cast<wchar_t>(ch));
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}
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void CFX_UTF8Decoder::Input(uint8_t byte) {
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if (byte < 0x80) {
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m_PendingBytes = 0;
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m_Buffer.AppendChar(byte);
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} else if (byte < 0xc0) {
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if (m_PendingBytes == 0) {
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return;
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}
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m_PendingBytes--;
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m_PendingChar |= (byte & 0x3f) << (m_PendingBytes * 6);
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if (m_PendingBytes == 0) {
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AppendCodePoint(m_PendingChar);
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}
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} else if (byte < 0xe0) {
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m_PendingBytes = 1;
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m_PendingChar = (byte & 0x1f) << 6;
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} else if (byte < 0xf0) {
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m_PendingBytes = 2;
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m_PendingChar = (byte & 0x0f) << 12;
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} else if (byte < 0xf8) {
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m_PendingBytes = 3;
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m_PendingChar = (byte & 0x07) << 18;
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} else if (byte < 0xfc) {
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m_PendingBytes = 4;
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m_PendingChar = (byte & 0x03) << 24;
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} else if (byte < 0xfe) {
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m_PendingBytes = 5;
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m_PendingChar = (byte & 0x01) << 30;
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} else {
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m_PendingBytes = 0;
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}
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}
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