| // Tencent is pleased to support the open source community by making RapidJSON available. |
| // |
| // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. |
| // |
| // Licensed under the MIT License (the "License"); you may not use this file except |
| // in compliance with the License. You may obtain a copy of the License at |
| // |
| // http://opensource.org/licenses/MIT |
| // |
| // 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. |
| |
| #ifndef RAPIDJSON_ENCODINGS_H_ |
| #define RAPIDJSON_ENCODINGS_H_ |
| |
| #include "rapidjson.h" |
| |
| #if defined(_MSC_VER) && !defined(__clang__) |
| RAPIDJSON_DIAG_PUSH |
| RAPIDJSON_DIAG_OFF(4244) // conversion from 'type1' to 'type2', possible loss of data |
| RAPIDJSON_DIAG_OFF(4702) // unreachable code |
| #elif defined(__GNUC__) |
| RAPIDJSON_DIAG_PUSH |
| RAPIDJSON_DIAG_OFF(effc++) |
| RAPIDJSON_DIAG_OFF(overflow) |
| #endif |
| |
| RAPIDJSON_NAMESPACE_BEGIN |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Encoding |
| |
| /*! \class rapidjson::Encoding |
| \brief Concept for encoding of Unicode characters. |
| |
| \code |
| concept Encoding { |
| typename Ch; //! Type of character. A "character" is actually a code unit in unicode's definition. |
| |
| enum { supportUnicode = 1 }; // or 0 if not supporting unicode |
| |
| //! \brief Encode a Unicode codepoint to an output stream. |
| //! \param os Output stream. |
| //! \param codepoint An unicode codepoint, ranging from 0x0 to 0x10FFFF inclusively. |
| template<typename OutputStream> |
| static void Encode(OutputStream& os, unsigned codepoint); |
| |
| //! \brief Decode a Unicode codepoint from an input stream. |
| //! \param is Input stream. |
| //! \param codepoint Output of the unicode codepoint. |
| //! \return true if a valid codepoint can be decoded from the stream. |
| template <typename InputStream> |
| static bool Decode(InputStream& is, unsigned* codepoint); |
| |
| //! \brief Validate one Unicode codepoint from an encoded stream. |
| //! \param is Input stream to obtain codepoint. |
| //! \param os Output for copying one codepoint. |
| //! \return true if it is valid. |
| //! \note This function just validating and copying the codepoint without actually decode it. |
| template <typename InputStream, typename OutputStream> |
| static bool Validate(InputStream& is, OutputStream& os); |
| |
| // The following functions are deal with byte streams. |
| |
| //! Take a character from input byte stream, skip BOM if exist. |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is); |
| |
| //! Take a character from input byte stream. |
| template <typename InputByteStream> |
| static Ch Take(InputByteStream& is); |
| |
| //! Put BOM to output byte stream. |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os); |
| |
| //! Put a character to output byte stream. |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, Ch c); |
| }; |
| \endcode |
| */ |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // UTF8 |
| |
| //! UTF-8 encoding. |
| /*! http://en.wikipedia.org/wiki/UTF-8 |
| http://tools.ietf.org/html/rfc3629 |
| \tparam CharType Code unit for storing 8-bit UTF-8 data. Default is char. |
| \note implements Encoding concept |
| */ |
| template<typename CharType = char> |
| struct UTF8 { |
| typedef CharType Ch; |
| |
| enum { supportUnicode = 1 }; |
| |
| template<typename OutputStream> |
| static void Encode(OutputStream& os, unsigned codepoint) { |
| if (codepoint <= 0x7F) |
| os.Put(static_cast<Ch>(codepoint & 0xFF)); |
| else if (codepoint <= 0x7FF) { |
| os.Put(static_cast<Ch>(0xC0 | ((codepoint >> 6) & 0xFF))); |
| os.Put(static_cast<Ch>(0x80 | ((codepoint & 0x3F)))); |
| } |
| else if (codepoint <= 0xFFFF) { |
| os.Put(static_cast<Ch>(0xE0 | ((codepoint >> 12) & 0xFF))); |
| os.Put(static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F))); |
| os.Put(static_cast<Ch>(0x80 | (codepoint & 0x3F))); |
| } |
| else { |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| os.Put(static_cast<Ch>(0xF0 | ((codepoint >> 18) & 0xFF))); |
| os.Put(static_cast<Ch>(0x80 | ((codepoint >> 12) & 0x3F))); |
| os.Put(static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F))); |
| os.Put(static_cast<Ch>(0x80 | (codepoint & 0x3F))); |
| } |
| } |
| |
| template<typename OutputStream> |
| static void EncodeUnsafe(OutputStream& os, unsigned codepoint) { |
| if (codepoint <= 0x7F) |
| PutUnsafe(os, static_cast<Ch>(codepoint & 0xFF)); |
| else if (codepoint <= 0x7FF) { |
| PutUnsafe(os, static_cast<Ch>(0xC0 | ((codepoint >> 6) & 0xFF))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint & 0x3F)))); |
| } |
| else if (codepoint <= 0xFFFF) { |
| PutUnsafe(os, static_cast<Ch>(0xE0 | ((codepoint >> 12) & 0xFF))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | (codepoint & 0x3F))); |
| } |
| else { |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| PutUnsafe(os, static_cast<Ch>(0xF0 | ((codepoint >> 18) & 0xFF))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 12) & 0x3F))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F))); |
| PutUnsafe(os, static_cast<Ch>(0x80 | (codepoint & 0x3F))); |
| } |
| } |
| |
| template <typename InputStream> |
| static bool Decode(InputStream& is, unsigned* codepoint) { |
| #define RAPIDJSON_COPY() c = is.Take(); *codepoint = (*codepoint << 6) | (static_cast<unsigned char>(c) & 0x3Fu) |
| #define RAPIDJSON_TRANS(mask) result &= ((GetRange(static_cast<unsigned char>(c)) & mask) != 0) |
| #define RAPIDJSON_TAIL() RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x70) |
| typename InputStream::Ch c = is.Take(); |
| if (!(c & 0x80)) { |
| *codepoint = static_cast<unsigned char>(c); |
| return true; |
| } |
| |
| unsigned char type = GetRange(static_cast<unsigned char>(c)); |
| if (type >= 32) { |
| *codepoint = 0; |
| } else { |
| *codepoint = (0xFFu >> type) & static_cast<unsigned char>(c); |
| } |
| bool result = true; |
| switch (type) { |
| case 2: RAPIDJSON_TAIL(); return result; |
| case 3: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 4: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x50); RAPIDJSON_TAIL(); return result; |
| case 5: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x10); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 6: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 10: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x20); RAPIDJSON_TAIL(); return result; |
| case 11: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x60); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| default: return false; |
| } |
| #undef RAPIDJSON_COPY |
| #undef RAPIDJSON_TRANS |
| #undef RAPIDJSON_TAIL |
| } |
| |
| template <typename InputStream, typename OutputStream> |
| static bool Validate(InputStream& is, OutputStream& os) { |
| #define RAPIDJSON_COPY() os.Put(c = is.Take()) |
| #define RAPIDJSON_TRANS(mask) result &= ((GetRange(static_cast<unsigned char>(c)) & mask) != 0) |
| #define RAPIDJSON_TAIL() RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x70) |
| Ch c; |
| RAPIDJSON_COPY(); |
| if (!(c & 0x80)) |
| return true; |
| |
| bool result = true; |
| switch (GetRange(static_cast<unsigned char>(c))) { |
| case 2: RAPIDJSON_TAIL(); return result; |
| case 3: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 4: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x50); RAPIDJSON_TAIL(); return result; |
| case 5: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x10); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 6: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| case 10: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x20); RAPIDJSON_TAIL(); return result; |
| case 11: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x60); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result; |
| default: return false; |
| } |
| #undef RAPIDJSON_COPY |
| #undef RAPIDJSON_TRANS |
| #undef RAPIDJSON_TAIL |
| } |
| |
| static unsigned char GetRange(unsigned char c) { |
| // Referring to DFA of http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ |
| // With new mapping 1 -> 0x10, 7 -> 0x20, 9 -> 0x40, such that AND operation can test multiple types. |
| static const unsigned char type[] = { |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10, |
| 0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40, |
| 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, |
| 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, |
| 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
| 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8, |
| }; |
| return type[c]; |
| } |
| |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| typename InputByteStream::Ch c = Take(is); |
| if (static_cast<unsigned char>(c) != 0xEFu) return c; |
| c = is.Take(); |
| if (static_cast<unsigned char>(c) != 0xBBu) return c; |
| c = is.Take(); |
| if (static_cast<unsigned char>(c) != 0xBFu) return c; |
| c = is.Take(); |
| return c; |
| } |
| |
| template <typename InputByteStream> |
| static Ch Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| return static_cast<Ch>(is.Take()); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xEFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xBBu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xBFu)); |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, Ch c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(c)); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // UTF16 |
| |
| //! UTF-16 encoding. |
| /*! http://en.wikipedia.org/wiki/UTF-16 |
| http://tools.ietf.org/html/rfc2781 |
| \tparam CharType Type for storing 16-bit UTF-16 data. Default is wchar_t. C++11 may use char16_t instead. |
| \note implements Encoding concept |
| |
| \note For in-memory access, no need to concern endianness. The code units and code points are represented by CPU's endianness. |
| For streaming, use UTF16LE and UTF16BE, which handle endianness. |
| */ |
| template<typename CharType = wchar_t> |
| struct UTF16 { |
| typedef CharType Ch; |
| RAPIDJSON_STATIC_ASSERT(sizeof(Ch) >= 2); |
| |
| enum { supportUnicode = 1 }; |
| |
| template<typename OutputStream> |
| static void Encode(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2); |
| if (codepoint <= 0xFFFF) { |
| RAPIDJSON_ASSERT(codepoint < 0xD800 || codepoint > 0xDFFF); // Code point itself cannot be surrogate pair |
| os.Put(static_cast<typename OutputStream::Ch>(codepoint)); |
| } |
| else { |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| unsigned v = codepoint - 0x10000; |
| os.Put(static_cast<typename OutputStream::Ch>((v >> 10) | 0xD800)); |
| os.Put(static_cast<typename OutputStream::Ch>((v & 0x3FF) | 0xDC00)); |
| } |
| } |
| |
| |
| template<typename OutputStream> |
| static void EncodeUnsafe(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2); |
| if (codepoint <= 0xFFFF) { |
| RAPIDJSON_ASSERT(codepoint < 0xD800 || codepoint > 0xDFFF); // Code point itself cannot be surrogate pair |
| PutUnsafe(os, static_cast<typename OutputStream::Ch>(codepoint)); |
| } |
| else { |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| unsigned v = codepoint - 0x10000; |
| PutUnsafe(os, static_cast<typename OutputStream::Ch>((v >> 10) | 0xD800)); |
| PutUnsafe(os, static_cast<typename OutputStream::Ch>((v & 0x3FF) | 0xDC00)); |
| } |
| } |
| |
| template <typename InputStream> |
| static bool Decode(InputStream& is, unsigned* codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 2); |
| typename InputStream::Ch c = is.Take(); |
| if (c < 0xD800 || c > 0xDFFF) { |
| *codepoint = static_cast<unsigned>(c); |
| return true; |
| } |
| else if (c <= 0xDBFF) { |
| *codepoint = (static_cast<unsigned>(c) & 0x3FF) << 10; |
| c = is.Take(); |
| *codepoint |= (static_cast<unsigned>(c) & 0x3FF); |
| *codepoint += 0x10000; |
| return c >= 0xDC00 && c <= 0xDFFF; |
| } |
| return false; |
| } |
| |
| template <typename InputStream, typename OutputStream> |
| static bool Validate(InputStream& is, OutputStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 2); |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2); |
| typename InputStream::Ch c; |
| os.Put(static_cast<typename OutputStream::Ch>(c = is.Take())); |
| if (c < 0xD800 || c > 0xDFFF) |
| return true; |
| else if (c <= 0xDBFF) { |
| os.Put(c = is.Take()); |
| return c >= 0xDC00 && c <= 0xDFFF; |
| } |
| return false; |
| } |
| }; |
| |
| //! UTF-16 little endian encoding. |
| template<typename CharType = wchar_t> |
| struct UTF16LE : UTF16<CharType> { |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| CharType c = Take(is); |
| return static_cast<uint16_t>(c) == 0xFEFFu ? Take(is) : c; |
| } |
| |
| template <typename InputByteStream> |
| static CharType Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| unsigned c = static_cast<uint8_t>(is.Take()); |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8; |
| return static_cast<CharType>(c); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu)); |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, CharType c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(static_cast<unsigned>(c) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((static_cast<unsigned>(c) >> 8) & 0xFFu)); |
| } |
| }; |
| |
| //! UTF-16 big endian encoding. |
| template<typename CharType = wchar_t> |
| struct UTF16BE : UTF16<CharType> { |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| CharType c = Take(is); |
| return static_cast<uint16_t>(c) == 0xFEFFu ? Take(is) : c; |
| } |
| |
| template <typename InputByteStream> |
| static CharType Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| unsigned c = static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())); |
| return static_cast<CharType>(c); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu)); |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, CharType c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>((static_cast<unsigned>(c) >> 8) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(static_cast<unsigned>(c) & 0xFFu)); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // UTF32 |
| |
| //! UTF-32 encoding. |
| /*! http://en.wikipedia.org/wiki/UTF-32 |
| \tparam CharType Type for storing 32-bit UTF-32 data. Default is unsigned. C++11 may use char32_t instead. |
| \note implements Encoding concept |
| |
| \note For in-memory access, no need to concern endianness. The code units and code points are represented by CPU's endianness. |
| For streaming, use UTF32LE and UTF32BE, which handle endianness. |
| */ |
| template<typename CharType = unsigned> |
| struct UTF32 { |
| typedef CharType Ch; |
| RAPIDJSON_STATIC_ASSERT(sizeof(Ch) >= 4); |
| |
| enum { supportUnicode = 1 }; |
| |
| template<typename OutputStream> |
| static void Encode(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 4); |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| os.Put(codepoint); |
| } |
| |
| template<typename OutputStream> |
| static void EncodeUnsafe(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 4); |
| RAPIDJSON_ASSERT(codepoint <= 0x10FFFF); |
| PutUnsafe(os, codepoint); |
| } |
| |
| template <typename InputStream> |
| static bool Decode(InputStream& is, unsigned* codepoint) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 4); |
| Ch c = is.Take(); |
| *codepoint = c; |
| return c <= 0x10FFFF; |
| } |
| |
| template <typename InputStream, typename OutputStream> |
| static bool Validate(InputStream& is, OutputStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 4); |
| Ch c; |
| os.Put(c = is.Take()); |
| return c <= 0x10FFFF; |
| } |
| }; |
| |
| //! UTF-32 little endian enocoding. |
| template<typename CharType = unsigned> |
| struct UTF32LE : UTF32<CharType> { |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| CharType c = Take(is); |
| return static_cast<uint32_t>(c) == 0x0000FEFFu ? Take(is) : c; |
| } |
| |
| template <typename InputByteStream> |
| static CharType Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| unsigned c = static_cast<uint8_t>(is.Take()); |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 16; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 24; |
| return static_cast<CharType>(c); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0x00u)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0x00u)); |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, CharType c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(c & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 8) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 16) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 24) & 0xFFu)); |
| } |
| }; |
| |
| //! UTF-32 big endian encoding. |
| template<typename CharType = unsigned> |
| struct UTF32BE : UTF32<CharType> { |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| CharType c = Take(is); |
| return static_cast<uint32_t>(c) == 0x0000FEFFu ? Take(is) : c; |
| } |
| |
| template <typename InputByteStream> |
| static CharType Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| unsigned c = static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 24; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 16; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8; |
| c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())); |
| return static_cast<CharType>(c); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0x00u)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0x00u)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu)); |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, CharType c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 24) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 16) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>((c >> 8) & 0xFFu)); |
| os.Put(static_cast<typename OutputByteStream::Ch>(c & 0xFFu)); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // ASCII |
| |
| //! ASCII encoding. |
| /*! http://en.wikipedia.org/wiki/ASCII |
| \tparam CharType Code unit for storing 7-bit ASCII data. Default is char. |
| \note implements Encoding concept |
| */ |
| template<typename CharType = char> |
| struct ASCII { |
| typedef CharType Ch; |
| |
| enum { supportUnicode = 0 }; |
| |
| template<typename OutputStream> |
| static void Encode(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_ASSERT(codepoint <= 0x7F); |
| os.Put(static_cast<Ch>(codepoint & 0xFF)); |
| } |
| |
| template<typename OutputStream> |
| static void EncodeUnsafe(OutputStream& os, unsigned codepoint) { |
| RAPIDJSON_ASSERT(codepoint <= 0x7F); |
| PutUnsafe(os, static_cast<Ch>(codepoint & 0xFF)); |
| } |
| |
| template <typename InputStream> |
| static bool Decode(InputStream& is, unsigned* codepoint) { |
| uint8_t c = static_cast<uint8_t>(is.Take()); |
| *codepoint = c; |
| return c <= 0X7F; |
| } |
| |
| template <typename InputStream, typename OutputStream> |
| static bool Validate(InputStream& is, OutputStream& os) { |
| uint8_t c = static_cast<uint8_t>(is.Take()); |
| os.Put(static_cast<typename OutputStream::Ch>(c)); |
| return c <= 0x7F; |
| } |
| |
| template <typename InputByteStream> |
| static CharType TakeBOM(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| uint8_t c = static_cast<uint8_t>(Take(is)); |
| return static_cast<Ch>(c); |
| } |
| |
| template <typename InputByteStream> |
| static Ch Take(InputByteStream& is) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1); |
| return static_cast<Ch>(is.Take()); |
| } |
| |
| template <typename OutputByteStream> |
| static void PutBOM(OutputByteStream& os) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| (void)os; |
| } |
| |
| template <typename OutputByteStream> |
| static void Put(OutputByteStream& os, Ch c) { |
| RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1); |
| os.Put(static_cast<typename OutputByteStream::Ch>(c)); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // AutoUTF |
| |
| //! Runtime-specified UTF encoding type of a stream. |
| enum UTFType { |
| kUTF8 = 0, //!< UTF-8. |
| kUTF16LE = 1, //!< UTF-16 little endian. |
| kUTF16BE = 2, //!< UTF-16 big endian. |
| kUTF32LE = 3, //!< UTF-32 little endian. |
| kUTF32BE = 4 //!< UTF-32 big endian. |
| }; |
| |
| //! Dynamically select encoding according to stream's runtime-specified UTF encoding type. |
| /*! \note This class can be used with AutoUTFInputtStream and AutoUTFOutputStream, which provides GetType(). |
| */ |
| template<typename CharType> |
| struct AutoUTF { |
| typedef CharType Ch; |
| |
| enum { supportUnicode = 1 }; |
| |
| #define RAPIDJSON_ENCODINGS_FUNC(x) UTF8<Ch>::x, UTF16LE<Ch>::x, UTF16BE<Ch>::x, UTF32LE<Ch>::x, UTF32BE<Ch>::x |
| |
| template<typename OutputStream> |
| static RAPIDJSON_FORCEINLINE void Encode(OutputStream& os, unsigned codepoint) { |
| typedef void (*EncodeFunc)(OutputStream&, unsigned); |
| static const EncodeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Encode) }; |
| (*f[os.GetType()])(os, codepoint); |
| } |
| |
| template<typename OutputStream> |
| static RAPIDJSON_FORCEINLINE void EncodeUnsafe(OutputStream& os, unsigned codepoint) { |
| typedef void (*EncodeFunc)(OutputStream&, unsigned); |
| static const EncodeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(EncodeUnsafe) }; |
| (*f[os.GetType()])(os, codepoint); |
| } |
| |
| template <typename InputStream> |
| static RAPIDJSON_FORCEINLINE bool Decode(InputStream& is, unsigned* codepoint) { |
| typedef bool (*DecodeFunc)(InputStream&, unsigned*); |
| static const DecodeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Decode) }; |
| return (*f[is.GetType()])(is, codepoint); |
| } |
| |
| template <typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool Validate(InputStream& is, OutputStream& os) { |
| typedef bool (*ValidateFunc)(InputStream&, OutputStream&); |
| static const ValidateFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Validate) }; |
| return (*f[is.GetType()])(is, os); |
| } |
| |
| #undef RAPIDJSON_ENCODINGS_FUNC |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Transcoder |
| |
| //! Encoding conversion. |
| template<typename SourceEncoding, typename TargetEncoding> |
| struct Transcoder { |
| //! Take one Unicode codepoint from source encoding, convert it to target encoding and put it to the output stream. |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool Transcode(InputStream& is, OutputStream& os) { |
| unsigned codepoint; |
| if (!SourceEncoding::Decode(is, &codepoint)) |
| return false; |
| TargetEncoding::Encode(os, codepoint); |
| return true; |
| } |
| |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool TranscodeUnsafe(InputStream& is, OutputStream& os) { |
| unsigned codepoint; |
| if (!SourceEncoding::Decode(is, &codepoint)) |
| return false; |
| TargetEncoding::EncodeUnsafe(os, codepoint); |
| return true; |
| } |
| |
| //! Validate one Unicode codepoint from an encoded stream. |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool Validate(InputStream& is, OutputStream& os) { |
| return Transcode(is, os); // Since source/target encoding is different, must transcode. |
| } |
| }; |
| |
| // Forward declaration. |
| template<typename Stream> |
| inline void PutUnsafe(Stream& stream, typename Stream::Ch c); |
| |
| //! Specialization of Transcoder with same source and target encoding. |
| template<typename Encoding> |
| struct Transcoder<Encoding, Encoding> { |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool Transcode(InputStream& is, OutputStream& os) { |
| os.Put(is.Take()); // Just copy one code unit. This semantic is different from primary template class. |
| return true; |
| } |
| |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool TranscodeUnsafe(InputStream& is, OutputStream& os) { |
| PutUnsafe(os, is.Take()); // Just copy one code unit. This semantic is different from primary template class. |
| return true; |
| } |
| |
| template<typename InputStream, typename OutputStream> |
| static RAPIDJSON_FORCEINLINE bool Validate(InputStream& is, OutputStream& os) { |
| return Encoding::Validate(is, os); // source/target encoding are the same |
| } |
| }; |
| |
| RAPIDJSON_NAMESPACE_END |
| |
| #if defined(__GNUC__) || (defined(_MSC_VER) && !defined(__clang__)) |
| RAPIDJSON_DIAG_POP |
| #endif |
| |
| #endif // RAPIDJSON_ENCODINGS_H_ |
