blob: 68ea30ac236b855f6dadd525c4a8124f33e2efdd [file] [log] [blame] [edit]
// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/cfx_utf8decoder.h"
CFX_UTF8Decoder::CFX_UTF8Decoder() = default;
CFX_UTF8Decoder::~CFX_UTF8Decoder() = default;
void CFX_UTF8Decoder::AppendCodePoint(uint32_t ch) {
m_Buffer.AppendChar(static_cast<wchar_t>(ch));
}
void CFX_UTF8Decoder::Input(uint8_t byte) {
if (byte < 0x80) {
m_PendingBytes = 0;
m_Buffer.AppendChar(byte);
} else if (byte < 0xc0) {
if (m_PendingBytes == 0) {
return;
}
m_PendingBytes--;
m_PendingChar |= (byte & 0x3f) << (m_PendingBytes * 6);
if (m_PendingBytes == 0) {
AppendCodePoint(m_PendingChar);
}
} else if (byte < 0xe0) {
m_PendingBytes = 1;
m_PendingChar = (byte & 0x1f) << 6;
} else if (byte < 0xf0) {
m_PendingBytes = 2;
m_PendingChar = (byte & 0x0f) << 12;
} else if (byte < 0xf8) {
m_PendingBytes = 3;
m_PendingChar = (byte & 0x07) << 18;
} else if (byte < 0xfc) {
m_PendingBytes = 4;
m_PendingChar = (byte & 0x03) << 24;
} else if (byte < 0xfe) {
m_PendingBytes = 5;
m_PendingChar = (byte & 0x01) << 30;
} else {
m_PendingBytes = 0;
}
}