1 files changed, 86 insertions, 0 deletions
diff --git a/core/fxcrt/fx_basic_utf.cpp b/core/fxcrt/fx_basic_utf.cpp
new file mode 100644
index 0000000000..3625feb130
--- /dev/null
+++ b/core/fxcrt/fx_basic_utf.cpp
@@ -0,0 +1,86 @@
+// 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);
+  if (len < 0) {
+    len = FXSYS_wcslen(pwsStr);
+  }
+  CFX_UTF8Encoder encoder;
+  while (len-- > 0) {
+    encoder.Input(*pwsStr++);
+  }
+  return encoder.GetResult();
+}