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 void CFX_UTF8Decoder::Clear() { 10 m_Buffer.Clear(); 11 m_PendingBytes = 0; 12 } 13 14 void CFX_UTF8Decoder::AppendCodePoint(uint32_t ch) { 15 m_Buffer.AppendChar(static_cast<wchar_t>(ch)); 16 } 17 18 void CFX_UTF8Decoder::Input(uint8_t byte) { 19 if (byte < 0x80) { 20 m_PendingBytes = 0; 21 m_Buffer.AppendChar(byte); 22 } else if (byte < 0xc0) { 23 if (m_PendingBytes == 0) { 24 return; 25 } 26 m_PendingBytes--; 27 m_PendingChar |= (byte & 0x3f) << (m_PendingBytes * 6); 28 if (m_PendingBytes == 0) { 29 AppendCodePoint(m_PendingChar); 30 } 31 } else if (byte < 0xe0) { 32 m_PendingBytes = 1; 33 m_PendingChar = (byte & 0x1f) << 6; 34 } else if (byte < 0xf0) { 35 m_PendingBytes = 2; 36 m_PendingChar = (byte & 0x0f) << 12; 37 } else if (byte < 0xf8) { 38 m_PendingBytes = 3; 39 m_PendingChar = (byte & 0x07) << 18; 40 } else if (byte < 0xfc) { 41 m_PendingBytes = 4; 42 m_PendingChar = (byte & 0x03) << 24; 43 } else if (byte < 0xfe) { 44 m_PendingBytes = 5; 45 m_PendingChar = (byte & 0x01) << 30; 46 } 47 } 48
