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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/fxcrt/fx_basic.h"
#include <vector>
namespace {
class CFX_UTF8Encoder {
public:
CFX_UTF8Encoder() {}
~CFX_UTF8Encoder() {}
void Input(wchar_t unicodeAsWchar) {
uint32_t unicode = static_cast<uint32_t>(unicodeAsWchar);
if (unicode < 0x80) {
m_Buffer.push_back(unicode);
} else {
if (unicode >= 0x80000000)
return;
int nbytes = 0;
if (unicode < 0x800)
nbytes = 2;
else if (unicode < 0x10000)
nbytes = 3;
else if (unicode < 0x200000)
nbytes = 4;
else if (unicode < 0x4000000)
nbytes = 5;
else
nbytes = 6;
static uint8_t prefix[] = {0xc0, 0xe0, 0xf0, 0xf8, 0xfc};
int order = 1 << ((nbytes - 1) * 6);
int code = unicodeAsWchar;
m_Buffer.push_back(prefix[nbytes - 2] | (code / order));
for (int i = 0; i < nbytes - 1; i++) {
code = code % order;
order >>= 6;
m_Buffer.push_back(0x80 | (code / order));
}
}
}
// The data returned by GetResult() is invalidated when this is modified by
// appending any data.
CFX_ByteStringC GetResult() const {
return CFX_ByteStringC(m_Buffer.data(), m_Buffer.size());
}
private:
std::vector<uint8_t> m_Buffer;
};
} // namespace
CFX_ByteString FX_UTF8Encode(const CFX_WideStringC& wsStr) {
FX_STRSIZE len = wsStr.GetLength();
const wchar_t* pStr = wsStr.unterminated_c_str();
CFX_UTF8Encoder encoder;
while (len-- > 0)
encoder.Input(*pStr++);
return CFX_ByteString(encoder.GetResult());
}
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