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// 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 "core/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(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) {
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 uint8_t 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(const FX_WCHAR* pwsStr, FX_STRSIZE len) {
FXSYS_assert(pwsStr != NULL);
if (len < 0) {
len = FXSYS_wcslen(pwsStr);
}
CFX_UTF8Encoder encoder;
while (len-- > 0) {
encoder.Input(*pwsStr++);
}
return encoder.GetResult();
}
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