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/*

• Copyright 2014 Facebook, Inc.
• Licensed under the Apache License, Version 2.0 (the "License");
• you may not use this file except in compliance with the License.
• You may obtain a copy of the License at
• http://www.apache.org/licenses/LICENSE-2.0
• Unless required by applicable law or agreed to in writing, software
• distributed under the License is distributed on an "AS IS" BASIS,
• WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
• See the License for the specific language governing permissions and
• limitations under the License. */

#include "folly/Unicode.h"

namespace folly {

//////////////////////////////////////////////////////////////////////

fbstring codePointToUtf8(char32_t cp) { fbstring result;

// Based on description from http://en.wikipedia.org/wiki/UTF-8.

if (cp <= 0x7f) { result.resize(1); result[0] = static_cast(cp); } else if (cp <= 0x7FF) { result.resize(2); result[1] = static_cast(0x80 | (0x3f & cp)); result[0] = static_cast(0xC0 | (cp >> 6)); } else if (cp <= 0xFFFF) { result.resize(3); result[2] = static_cast(0x80 | (0x3f & cp)); result[1] = (0x80 | static_cast((0x3f & (cp >> 6)))); result[0] = (0xE0 | static_cast(cp >> 12)); } else if (cp <= 0x10FFFF) { result.resize(4); result[3] = static_cast(0x80 | (0x3f & cp)); result[2] = static_cast(0x80 | (0x3f & (cp >> 6))); result[1] = static_cast(0x80 | (0x3f & (cp >> 12))); result[0] = static_cast(0xF0 | (cp >> 18)); }

return result; }

//////////////////////////////////////////////////////////////////////

}