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Diffstat (limited to 'external/rapidjson/encodings.h')
| -rw-r--r-- | external/rapidjson/encodings.h | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/external/rapidjson/encodings.h b/external/rapidjson/encodings.h new file mode 100644 index 000000000..5c7da3e04 --- /dev/null +++ b/external/rapidjson/encodings.h @@ -0,0 +1,630 @@ +// Copyright (C) 2011 Milo Yip
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef RAPIDJSON_ENCODINGS_H_
+#define RAPIDJSON_ENCODINGS_H_
+
+#include "rapidjson.h"
+
+#ifdef _MSC_VER
+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++)
+#endif
+
+namespace rapidjson {
+
+///////////////////////////////////////////////////////////////////////////////
+// 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 InputStream>
+ static bool Decode(InputStream& is, unsigned* codepoint) {
+#define COPY() c = is.Take(); *codepoint = (*codepoint << 6) | ((unsigned char)c & 0x3Fu)
+#define TRANS(mask) result &= ((GetRange((unsigned char)c) & mask) != 0)
+#define TAIL() COPY(); TRANS(0x70)
+ Ch c = is.Take();
+ if (!(c & 0x80)) {
+ *codepoint = (unsigned char)c;
+ return true;
+ }
+
+ unsigned char type = GetRange((unsigned char)c);
+ *codepoint = (0xFF >> type) & (unsigned char)c;
+ bool result = true;
+ switch (type) {
+ case 2: TAIL(); return result;
+ case 3: TAIL(); TAIL(); return result;
+ case 4: COPY(); TRANS(0x50); TAIL(); return result;
+ case 5: COPY(); TRANS(0x10); TAIL(); TAIL(); return result;
+ case 6: TAIL(); TAIL(); TAIL(); return result;
+ case 10: COPY(); TRANS(0x20); TAIL(); return result;
+ case 11: COPY(); TRANS(0x60); TAIL(); TAIL(); return result;
+ default: return false;
+ }
+#undef COPY
+#undef TRANS
+#undef TAIL
+ }
+
+ template <typename InputStream, typename OutputStream>
+ static bool Validate(InputStream& is, OutputStream& os) {
+#define COPY() os.Put(c = is.Take())
+#define TRANS(mask) result &= ((GetRange((unsigned char)c) & mask) != 0)
+#define TAIL() COPY(); TRANS(0x70)
+ Ch c;
+ COPY();
+ if (!(c & 0x80))
+ return true;
+
+ bool result = true;
+ switch (GetRange((unsigned char)c)) {
+ case 2: TAIL(); return result;
+ case 3: TAIL(); TAIL(); return result;
+ case 4: COPY(); TRANS(0x50); TAIL(); return result;
+ case 5: COPY(); TRANS(0x10); TAIL(); TAIL(); return result;
+ case 6: TAIL(); TAIL(); TAIL(); return result;
+ case 10: COPY(); TRANS(0x20); TAIL(); return result;
+ case 11: COPY(); TRANS(0x60); TAIL(); TAIL(); return result;
+ default: return false;
+ }
+#undef COPY
+#undef TRANS
+#undef 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);
+ Ch c = Take(is);
+ if ((unsigned char)c != 0xEFu) return c;
+ c = is.Take();
+ if ((unsigned char)c != 0xBBu) return c;
+ c = is.Take();
+ if ((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 is.Take();
+ }
+
+ template <typename OutputByteStream>
+ static void PutBOM(OutputByteStream& os) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(0xEFu); os.Put(0xBBu); os.Put(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((v & 0x3FF) | 0xDC00);
+ }
+ }
+
+ template <typename InputStream>
+ static bool Decode(InputStream& is, unsigned* codepoint) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 2);
+ Ch c = is.Take();
+ if (c < 0xD800 || c > 0xDFFF) {
+ *codepoint = c;
+ return true;
+ }
+ else if (c <= 0xDBFF) {
+ *codepoint = (c & 0x3FF) << 10;
+ c = is.Take();
+ *codepoint |= (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);
+ Ch c;
+ os.Put(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 (unsigned short)c == 0xFEFFu ? Take(is) : c;
+ }
+
+ template <typename InputByteStream>
+ static CharType Take(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ CharType c = (unsigned char)is.Take();
+ c |= (unsigned char)is.Take() << 8;
+ return c;
+ }
+
+ template <typename OutputByteStream>
+ static void PutBOM(OutputByteStream& os) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(0xFFu); os.Put(0xFEu);
+ }
+
+ template <typename OutputByteStream>
+ static void Put(OutputByteStream& os, CharType c) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(c & 0xFFu);
+ os.Put((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 (unsigned short)c == 0xFEFFu ? Take(is) : c;
+ }
+
+ template <typename InputByteStream>
+ static CharType Take(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ CharType c = (unsigned char)is.Take() << 8;
+ c |= (unsigned char)is.Take();
+ return c;
+ }
+
+ template <typename OutputByteStream>
+ static void PutBOM(OutputByteStream& os) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(0xFEu); os.Put(0xFFu);
+ }
+
+ template <typename OutputByteStream>
+ static void Put(OutputByteStream& os, CharType c) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put((c >> 8) & 0xFFu);
+ os.Put(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 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 (unsigned)c == 0x0000FEFFu ? Take(is) : c;
+ }
+
+ template <typename InputByteStream>
+ static CharType Take(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ CharType c = (unsigned char)is.Take();
+ c |= (unsigned char)is.Take() << 8;
+ c |= (unsigned char)is.Take() << 16;
+ c |= (unsigned char)is.Take() << 24;
+ return c;
+ }
+
+ template <typename OutputByteStream>
+ static void PutBOM(OutputByteStream& os) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(0xFFu); os.Put(0xFEu); os.Put(0x00u); os.Put(0x00u);
+ }
+
+ template <typename OutputByteStream>
+ static void Put(OutputByteStream& os, CharType c) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(c & 0xFFu);
+ os.Put((c >> 8) & 0xFFu);
+ os.Put((c >> 16) & 0xFFu);
+ os.Put((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 (unsigned)c == 0x0000FEFFu ? Take(is) : c;
+ }
+
+ template <typename InputByteStream>
+ static CharType Take(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ CharType c = (unsigned char)is.Take() << 24;
+ c |= (unsigned char)is.Take() << 16;
+ c |= (unsigned char)is.Take() << 8;
+ c |= (unsigned char)is.Take();
+ return c;
+ }
+
+ template <typename OutputByteStream>
+ static void PutBOM(OutputByteStream& os) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put(0x00u); os.Put(0x00u); os.Put(0xFEu); os.Put(0xFFu);
+ }
+
+ template <typename OutputByteStream>
+ static void Put(OutputByteStream& os, CharType c) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
+ os.Put((c >> 24) & 0xFFu);
+ os.Put((c >> 16) & 0xFFu);
+ os.Put((c >> 8) & 0xFFu);
+ os.Put(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 InputStream>
+ static bool Decode(InputStream& is, unsigned* codepoint) {
+ unsigned char c = static_cast<unsigned char>(is.Take());
+ *codepoint = c;
+ return c <= 0X7F;
+ }
+
+ template <typename InputStream, typename OutputStream>
+ static bool Validate(InputStream& is, OutputStream& os) {
+ unsigned char c = is.Take();
+ os.Put(c);
+ return c <= 0x7F;
+ }
+
+ template <typename InputByteStream>
+ static CharType TakeBOM(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ Ch c = Take(is);
+ return c;
+ }
+
+ template <typename InputByteStream>
+ static Ch Take(InputByteStream& is) {
+ RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
+ return 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>
+ RAPIDJSON_FORCEINLINE static 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 InputStream>
+ RAPIDJSON_FORCEINLINE static 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>
+ RAPIDJSON_FORCEINLINE static 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>
+ RAPIDJSON_FORCEINLINE static bool Transcode(InputStream& is, OutputStream& os) {
+ unsigned codepoint;
+ if (!SourceEncoding::Decode(is, &codepoint))
+ return false;
+ TargetEncoding::Encode(os, codepoint);
+ return true;
+ }
+
+ //! Validate one Unicode codepoint from an encoded stream.
+ template<typename InputStream, typename OutputStream>
+ RAPIDJSON_FORCEINLINE static bool Validate(InputStream& is, OutputStream& os) {
+ return Transcode(is, os); // Since source/target encoding is different, must transcode.
+ }
+};
+
+//! Specialization of Transcoder with same source and target encoding.
+template<typename Encoding>
+struct Transcoder<Encoding, Encoding> {
+ template<typename InputStream, typename OutputStream>
+ RAPIDJSON_FORCEINLINE static 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>
+ RAPIDJSON_FORCEINLINE static bool Validate(InputStream& is, OutputStream& os) {
+ return Encoding::Validate(is, os); // source/target encoding are the same
+ }
+};
+
+} // namespace rapidjson
+
+#if defined(__GNUC__) || defined(_MSV_VER)
+RAPIDJSON_DIAG_POP
+#endif
+
+#endif // RAPIDJSON_ENCODINGS_H_
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