| // Copyright 2014 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 "../../include/fxcrt/fx_basic.h" |
| void CFX_UTF8Decoder::Clear() |
| { |
| m_Buffer.Clear(); |
| m_PendingBytes = 0; |
| } |
| void CFX_UTF8Decoder::AppendChar(FX_DWORD ch) |
| { |
| m_Buffer.AppendChar((FX_WCHAR)ch); |
| } |
| void CFX_UTF8Decoder::Input(FX_BYTE 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) { |
| AppendChar(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; |
| } |
| } |
| void CFX_UTF8Encoder::Input(FX_WCHAR unicode) |
| { |
| if ((FX_DWORD)unicode < 0x80) { |
| m_Buffer.AppendChar(unicode); |
| } else { |
| if ((FX_DWORD)unicode >= 0x80000000) { |
| return; |
| } |
| int nbytes = 0; |
| if ((FX_DWORD)unicode < 0x800) { |
| nbytes = 2; |
| } else if ((FX_DWORD)unicode < 0x10000) { |
| nbytes = 3; |
| } else if ((FX_DWORD)unicode < 0x200000) { |
| nbytes = 4; |
| } else if ((FX_DWORD)unicode < 0x4000000) { |
| nbytes = 5; |
| } else { |
| nbytes = 6; |
| } |
| static FX_BYTE prefix[] = {0xc0, 0xe0, 0xf0, 0xf8, 0xfc}; |
| int order = 1 << ((nbytes - 1) * 6); |
| int code = unicode; |
| m_Buffer.AppendChar(prefix[nbytes - 2] | (code / order)); |
| for (int i = 0; i < nbytes - 1; i ++) { |
| code = code % order; |
| order >>= 6; |
| m_Buffer.AppendChar(0x80 | (code / order)); |
| } |
| } |
| } |
| CFX_ByteString FX_UTF8Encode(FX_LPCWSTR pwsStr, FX_STRSIZE len) |
| { |
| FXSYS_assert(pwsStr != NULL); |
| if (len < 0) { |
| len = (FX_STRSIZE)FXSYS_wcslen(pwsStr); |
| } |
| CFX_UTF8Encoder encoder; |
| while (len -- > 0) { |
| encoder.Input(*pwsStr ++); |
| } |
| return encoder.GetResult(); |
| } |
