1 // Copyright 2017 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #include "core/fxcrt/cfx_utf8decoder.h" 8 9 CFX_UTF8Decoder::CFX_UTF8Decoder() = default; 10 11 CFX_UTF8Decoder::~CFX_UTF8Decoder() = default; 12 AppendCodePoint(uint32_t ch)13void CFX_UTF8Decoder::AppendCodePoint(uint32_t ch) { 14 m_Buffer.AppendChar(static_cast<wchar_t>(ch)); 15 } 16 Input(uint8_t byte)17void CFX_UTF8Decoder::Input(uint8_t byte) { 18 if (byte < 0x80) { 19 m_PendingBytes = 0; 20 m_Buffer.AppendChar(byte); 21 } else if (byte < 0xc0) { 22 if (m_PendingBytes == 0) { 23 return; 24 } 25 m_PendingBytes--; 26 m_PendingChar |= (byte & 0x3f) << (m_PendingBytes * 6); 27 if (m_PendingBytes == 0) { 28 AppendCodePoint(m_PendingChar); 29 } 30 } else if (byte < 0xe0) { 31 m_PendingBytes = 1; 32 m_PendingChar = (byte & 0x1f) << 6; 33 } else if (byte < 0xf0) { 34 m_PendingBytes = 2; 35 m_PendingChar = (byte & 0x0f) << 12; 36 } else if (byte < 0xf8) { 37 m_PendingBytes = 3; 38 m_PendingChar = (byte & 0x07) << 18; 39 } else if (byte < 0xfc) { 40 m_PendingBytes = 4; 41 m_PendingChar = (byte & 0x03) << 24; 42 } else if (byte < 0xfe) { 43 m_PendingBytes = 5; 44 m_PendingChar = (byte & 0x01) << 30; 45 } else { 46 m_PendingBytes = 0; 47 } 48 } 49