717 lines
29 KiB
C++
Executable File
717 lines
29 KiB
C++
Executable File
// Tencent is pleased to support the open source community by making RapidJSON available.
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//
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// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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//
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// Licensed under the MIT License (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://opensource.org/licenses/MIT
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//
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#ifndef RAPIDJSON_ENCODINGS_H_
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#define RAPIDJSON_ENCODINGS_H_
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#include "rapidjson.h"
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#if defined(_MSC_VER) && !defined(__clang__)
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(4244) // conversion from 'type1' to 'type2', possible loss of data
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RAPIDJSON_DIAG_OFF(4702) // unreachable code
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#elif defined(__GNUC__)
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(effc++)
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RAPIDJSON_DIAG_OFF(overflow)
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#endif
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RAPIDJSON_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////////
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// Encoding
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/*! \class rapidjson::Encoding
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\brief Concept for encoding of Unicode characters.
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\code
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concept Encoding {
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typename Ch; //! Type of character. A "character" is actually a code unit in unicode's definition.
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enum { supportUnicode = 1 }; // or 0 if not supporting unicode
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//! \brief Encode a Unicode codepoint to an output stream.
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//! \param os Output stream.
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//! \param codepoint An unicode codepoint, ranging from 0x0 to 0x10FFFF inclusively.
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template<typename OutputStream>
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static void Encode(OutputStream& os, unsigned codepoint);
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//! \brief Decode a Unicode codepoint from an input stream.
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//! \param is Input stream.
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//! \param codepoint Output of the unicode codepoint.
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//! \return true if a valid codepoint can be decoded from the stream.
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template <typename InputStream>
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static bool Decode(InputStream& is, unsigned* codepoint);
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//! \brief Validate one Unicode codepoint from an encoded stream.
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//! \param is Input stream to obtain codepoint.
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//! \param os Output for copying one codepoint.
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//! \return true if it is valid.
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//! \note This function just validating and copying the codepoint without actually decode it.
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template <typename InputStream, typename OutputStream>
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static bool Validate(InputStream& is, OutputStream& os);
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// The following functions are deal with byte streams.
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//! Take a character from input byte stream, skip BOM if exist.
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template <typename InputByteStream>
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static CharType TakeBOM(InputByteStream& is);
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//! Take a character from input byte stream.
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template <typename InputByteStream>
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static Ch Take(InputByteStream& is);
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//! Put BOM to output byte stream.
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template <typename OutputByteStream>
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static void PutBOM(OutputByteStream& os);
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//! Put a character to output byte stream.
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template <typename OutputByteStream>
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static void Put(OutputByteStream& os, Ch c);
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};
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\endcode
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*/
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///////////////////////////////////////////////////////////////////////////////
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// UTF8
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//! UTF-8 encoding.
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/*! http://en.wikipedia.org/wiki/UTF-8
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http://tools.ietf.org/html/rfc3629
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\tparam CharType Code unit for storing 8-bit UTF-8 data. Default is char.
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\note implements Encoding concept
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*/
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template<typename CharType = char>
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struct UTF8 {
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typedef CharType Ch;
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enum { supportUnicode = 1 };
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template<typename OutputStream>
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static void Encode(OutputStream& os, unsigned codepoint) {
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if (codepoint <= 0x7F)
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os.Put(static_cast<Ch>(codepoint & 0xFF));
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else if (codepoint <= 0x7FF) {
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os.Put(static_cast<Ch>(0xC0 | ((codepoint >> 6) & 0xFF)));
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os.Put(static_cast<Ch>(0x80 | ((codepoint & 0x3F))));
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}
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else if (codepoint <= 0xFFFF) {
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os.Put(static_cast<Ch>(0xE0 | ((codepoint >> 12) & 0xFF)));
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os.Put(static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F)));
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os.Put(static_cast<Ch>(0x80 | (codepoint & 0x3F)));
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}
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else {
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RAPIDJSON_ASSERT(codepoint <= 0x10FFFF);
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os.Put(static_cast<Ch>(0xF0 | ((codepoint >> 18) & 0xFF)));
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os.Put(static_cast<Ch>(0x80 | ((codepoint >> 12) & 0x3F)));
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os.Put(static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F)));
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os.Put(static_cast<Ch>(0x80 | (codepoint & 0x3F)));
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}
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}
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template<typename OutputStream>
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static void EncodeUnsafe(OutputStream& os, unsigned codepoint) {
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if (codepoint <= 0x7F)
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PutUnsafe(os, static_cast<Ch>(codepoint & 0xFF));
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else if (codepoint <= 0x7FF) {
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PutUnsafe(os, static_cast<Ch>(0xC0 | ((codepoint >> 6) & 0xFF)));
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PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint & 0x3F))));
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}
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else if (codepoint <= 0xFFFF) {
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PutUnsafe(os, static_cast<Ch>(0xE0 | ((codepoint >> 12) & 0xFF)));
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PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F)));
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PutUnsafe(os, static_cast<Ch>(0x80 | (codepoint & 0x3F)));
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}
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else {
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RAPIDJSON_ASSERT(codepoint <= 0x10FFFF);
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PutUnsafe(os, static_cast<Ch>(0xF0 | ((codepoint >> 18) & 0xFF)));
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PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 12) & 0x3F)));
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PutUnsafe(os, static_cast<Ch>(0x80 | ((codepoint >> 6) & 0x3F)));
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PutUnsafe(os, static_cast<Ch>(0x80 | (codepoint & 0x3F)));
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}
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}
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template <typename InputStream>
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static bool Decode(InputStream& is, unsigned* codepoint) {
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#define RAPIDJSON_COPY() c = is.Take(); *codepoint = (*codepoint << 6) | (static_cast<unsigned char>(c) & 0x3Fu)
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#define RAPIDJSON_TRANS(mask) result &= ((GetRange(static_cast<unsigned char>(c)) & mask) != 0)
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#define RAPIDJSON_TAIL() RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x70)
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typename InputStream::Ch c = is.Take();
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if (!(c & 0x80)) {
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*codepoint = static_cast<unsigned char>(c);
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return true;
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}
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unsigned char type = GetRange(static_cast<unsigned char>(c));
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if (type >= 32) {
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*codepoint = 0;
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} else {
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*codepoint = (0xFFu >> type) & static_cast<unsigned char>(c);
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}
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bool result = true;
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switch (type) {
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case 2: RAPIDJSON_TAIL(); return result;
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case 3: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 4: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x50); RAPIDJSON_TAIL(); return result;
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case 5: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x10); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 6: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 10: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x20); RAPIDJSON_TAIL(); return result;
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case 11: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x60); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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default: return false;
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}
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#undef RAPIDJSON_COPY
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#undef RAPIDJSON_TRANS
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#undef RAPIDJSON_TAIL
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}
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template <typename InputStream, typename OutputStream>
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static bool Validate(InputStream& is, OutputStream& os) {
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#define RAPIDJSON_COPY() os.Put(c = is.Take())
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#define RAPIDJSON_TRANS(mask) result &= ((GetRange(static_cast<unsigned char>(c)) & mask) != 0)
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#define RAPIDJSON_TAIL() RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x70)
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Ch c;
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RAPIDJSON_COPY();
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if (!(c & 0x80))
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return true;
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bool result = true;
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switch (GetRange(static_cast<unsigned char>(c))) {
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case 2: RAPIDJSON_TAIL(); return result;
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case 3: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 4: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x50); RAPIDJSON_TAIL(); return result;
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case 5: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x10); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 6: RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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case 10: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x20); RAPIDJSON_TAIL(); return result;
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case 11: RAPIDJSON_COPY(); RAPIDJSON_TRANS(0x60); RAPIDJSON_TAIL(); RAPIDJSON_TAIL(); return result;
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default: return false;
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}
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#undef RAPIDJSON_COPY
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#undef RAPIDJSON_TRANS
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#undef RAPIDJSON_TAIL
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}
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static unsigned char GetRange(unsigned char c) {
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// Referring to DFA of http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
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// With new mapping 1 -> 0x10, 7 -> 0x20, 9 -> 0x40, such that AND operation can test multiple types.
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static const unsigned char type[] = {
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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,
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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,
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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,
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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,
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0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,
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0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,
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0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
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0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
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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,
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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,
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};
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return type[c];
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}
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template <typename InputByteStream>
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static CharType TakeBOM(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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typename InputByteStream::Ch c = Take(is);
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if (static_cast<unsigned char>(c) != 0xEFu) return c;
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c = is.Take();
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if (static_cast<unsigned char>(c) != 0xBBu) return c;
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c = is.Take();
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if (static_cast<unsigned char>(c) != 0xBFu) return c;
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c = is.Take();
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return c;
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}
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template <typename InputByteStream>
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static Ch Take(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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return static_cast<Ch>(is.Take());
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}
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template <typename OutputByteStream>
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static void PutBOM(OutputByteStream& os) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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os.Put(static_cast<typename OutputByteStream::Ch>(0xEFu));
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os.Put(static_cast<typename OutputByteStream::Ch>(0xBBu));
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os.Put(static_cast<typename OutputByteStream::Ch>(0xBFu));
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}
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template <typename OutputByteStream>
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static void Put(OutputByteStream& os, Ch c) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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os.Put(static_cast<typename OutputByteStream::Ch>(c));
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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// UTF16
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//! UTF-16 encoding.
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/*! http://en.wikipedia.org/wiki/UTF-16
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http://tools.ietf.org/html/rfc2781
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\tparam CharType Type for storing 16-bit UTF-16 data. Default is wchar_t. C++11 may use char16_t instead.
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\note implements Encoding concept
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\note For in-memory access, no need to concern endianness. The code units and code points are represented by CPU's endianness.
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For streaming, use UTF16LE and UTF16BE, which handle endianness.
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*/
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template<typename CharType = wchar_t>
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struct UTF16 {
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typedef CharType Ch;
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RAPIDJSON_STATIC_ASSERT(sizeof(Ch) >= 2);
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enum { supportUnicode = 1 };
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template<typename OutputStream>
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static void Encode(OutputStream& os, unsigned codepoint) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2);
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if (codepoint <= 0xFFFF) {
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RAPIDJSON_ASSERT(codepoint < 0xD800 || codepoint > 0xDFFF); // Code point itself cannot be surrogate pair
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os.Put(static_cast<typename OutputStream::Ch>(codepoint));
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}
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else {
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RAPIDJSON_ASSERT(codepoint <= 0x10FFFF);
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unsigned v = codepoint - 0x10000;
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os.Put(static_cast<typename OutputStream::Ch>((v >> 10) | 0xD800));
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os.Put(static_cast<typename OutputStream::Ch>((v & 0x3FF) | 0xDC00));
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}
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}
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template<typename OutputStream>
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static void EncodeUnsafe(OutputStream& os, unsigned codepoint) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2);
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if (codepoint <= 0xFFFF) {
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RAPIDJSON_ASSERT(codepoint < 0xD800 || codepoint > 0xDFFF); // Code point itself cannot be surrogate pair
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PutUnsafe(os, static_cast<typename OutputStream::Ch>(codepoint));
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}
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else {
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RAPIDJSON_ASSERT(codepoint <= 0x10FFFF);
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unsigned v = codepoint - 0x10000;
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PutUnsafe(os, static_cast<typename OutputStream::Ch>((v >> 10) | 0xD800));
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PutUnsafe(os, static_cast<typename OutputStream::Ch>((v & 0x3FF) | 0xDC00));
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}
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}
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template <typename InputStream>
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static bool Decode(InputStream& is, unsigned* codepoint) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 2);
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typename InputStream::Ch c = is.Take();
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if (c < 0xD800 || c > 0xDFFF) {
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*codepoint = static_cast<unsigned>(c);
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return true;
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}
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else if (c <= 0xDBFF) {
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*codepoint = (static_cast<unsigned>(c) & 0x3FF) << 10;
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c = is.Take();
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*codepoint |= (static_cast<unsigned>(c) & 0x3FF);
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*codepoint += 0x10000;
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return c >= 0xDC00 && c <= 0xDFFF;
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}
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return false;
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}
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template <typename InputStream, typename OutputStream>
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static bool Validate(InputStream& is, OutputStream& os) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputStream::Ch) >= 2);
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputStream::Ch) >= 2);
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typename InputStream::Ch c;
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os.Put(static_cast<typename OutputStream::Ch>(c = is.Take()));
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if (c < 0xD800 || c > 0xDFFF)
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return true;
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else if (c <= 0xDBFF) {
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os.Put(c = is.Take());
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return c >= 0xDC00 && c <= 0xDFFF;
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}
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return false;
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}
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};
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//! UTF-16 little endian encoding.
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template<typename CharType = wchar_t>
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struct UTF16LE : UTF16<CharType> {
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template <typename InputByteStream>
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static CharType TakeBOM(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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CharType c = Take(is);
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return static_cast<uint16_t>(c) == 0xFEFFu ? Take(is) : c;
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}
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template <typename InputByteStream>
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static CharType Take(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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unsigned c = static_cast<uint8_t>(is.Take());
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c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8;
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return static_cast<CharType>(c);
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}
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template <typename OutputByteStream>
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static void PutBOM(OutputByteStream& os) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu));
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os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu));
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}
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template <typename OutputByteStream>
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static void Put(OutputByteStream& os, CharType c) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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os.Put(static_cast<typename OutputByteStream::Ch>(static_cast<unsigned>(c) & 0xFFu));
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os.Put(static_cast<typename OutputByteStream::Ch>((static_cast<unsigned>(c) >> 8) & 0xFFu));
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}
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};
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//! UTF-16 big endian encoding.
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template<typename CharType = wchar_t>
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struct UTF16BE : UTF16<CharType> {
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template <typename InputByteStream>
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static CharType TakeBOM(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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CharType c = Take(is);
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return static_cast<uint16_t>(c) == 0xFEFFu ? Take(is) : c;
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}
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template <typename InputByteStream>
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static CharType Take(InputByteStream& is) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
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unsigned c = static_cast<unsigned>(static_cast<uint8_t>(is.Take())) << 8;
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c |= static_cast<unsigned>(static_cast<uint8_t>(is.Take()));
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return static_cast<CharType>(c);
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}
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template <typename OutputByteStream>
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static void PutBOM(OutputByteStream& os) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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os.Put(static_cast<typename OutputByteStream::Ch>(0xFEu));
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os.Put(static_cast<typename OutputByteStream::Ch>(0xFFu));
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}
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template <typename OutputByteStream>
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static void Put(OutputByteStream& os, CharType c) {
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RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
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|
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_
|