// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/include/fx_basic.h"
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void CFX_UTF8Decoder::Clear() {
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m_Buffer.Clear();
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m_PendingBytes = 0;
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}
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void CFX_UTF8Decoder::AppendChar(uint32_t ch) {
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m_Buffer.AppendChar((FX_WCHAR)ch);
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}
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void CFX_UTF8Decoder::Input(uint8_t byte) {
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if (byte < 0x80) {
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m_PendingBytes = 0;
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m_Buffer.AppendChar(byte);
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} else if (byte < 0xc0) {
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if (m_PendingBytes == 0) {
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return;
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}
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m_PendingBytes--;
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m_PendingChar |= (byte & 0x3f) << (m_PendingBytes * 6);
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if (m_PendingBytes == 0) {
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AppendChar(m_PendingChar);
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}
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} else if (byte < 0xe0) {
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m_PendingBytes = 1;
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m_PendingChar = (byte & 0x1f) << 6;
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} else if (byte < 0xf0) {
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m_PendingBytes = 2;
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m_PendingChar = (byte & 0x0f) << 12;
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} else if (byte < 0xf8) {
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m_PendingBytes = 3;
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m_PendingChar = (byte & 0x07) << 18;
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} else if (byte < 0xfc) {
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m_PendingBytes = 4;
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m_PendingChar = (byte & 0x03) << 24;
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} else if (byte < 0xfe) {
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m_PendingBytes = 5;
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m_PendingChar = (byte & 0x01) << 30;
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}
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}
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void CFX_UTF8Encoder::Input(FX_WCHAR unicode) {
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if ((uint32_t)unicode < 0x80) {
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m_Buffer.AppendChar(unicode);
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} else {
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if ((uint32_t)unicode >= 0x80000000) {
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return;
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}
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int nbytes = 0;
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if ((uint32_t)unicode < 0x800) {
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nbytes = 2;
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} else if ((uint32_t)unicode < 0x10000) {
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nbytes = 3;
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} else if ((uint32_t)unicode < 0x200000) {
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nbytes = 4;
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} else if ((uint32_t)unicode < 0x4000000) {
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nbytes = 5;
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} else {
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nbytes = 6;
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}
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static uint8_t prefix[] = {0xc0, 0xe0, 0xf0, 0xf8, 0xfc};
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int order = 1 << ((nbytes - 1) * 6);
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int code = unicode;
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m_Buffer.AppendChar(prefix[nbytes - 2] | (code / order));
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for (int i = 0; i < nbytes - 1; i++) {
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code = code % order;
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order >>= 6;
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m_Buffer.AppendChar(0x80 | (code / order));
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}
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}
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}
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CFX_ByteString FX_UTF8Encode(const FX_WCHAR* pwsStr, FX_STRSIZE len) {
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if (len < 0)
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len = FXSYS_wcslen(pwsStr);
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CFX_UTF8Encoder encoder;
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while (len-- > 0)
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encoder.Input(*pwsStr++);
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return CFX_ByteString(encoder.GetResult());
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}
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