src/third_party/angle/src/tests/third_party/rapidjson/include/rapidjson/encodedstream.h - cobalt - Git at Google

 // 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_ENCODEDSTREAM_H_
 #define RAPIDJSON_ENCODEDSTREAM_H_

 #include "rapidjson.h"

 #ifdef __GNUC__
 RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(effc++)
 #endif

 RAPIDJSON_NAMESPACE_BEGIN

 //! Input byte stream wrapper with a statically bound encoding.
 /*!
     \tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
     \tparam InputByteStream Type of input byte stream. For example, FileReadStream.
 */
 template <typename Encoding, typename InputByteStream>
 class EncodedInputStream {
     RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
 public:
     typedef typename Encoding::Ch Ch;

     EncodedInputStream(InputByteStream& is) : is_(is) {
         current_ = Encoding::TakeBOM(is_);
     }

     Ch Peek() const { return current_; }
     Ch Take() { Ch c = current_; current_ = Encoding::Take(is_); return c; }
     size_t Tell() const { return is_.Tell(); }

     // Not implemented
     void Put(Ch) { RAPIDJSON_ASSERT(false); }
     void Flush() { RAPIDJSON_ASSERT(false); }
     Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
     size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

 private:
     EncodedInputStream(const EncodedInputStream&);
     EncodedInputStream& operator=(const EncodedInputStream&);

     InputByteStream& is_;
     Ch current_;
 };

 //! Output byte stream wrapper with statically bound encoding.
 /*!
     \tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
     \tparam InputByteStream Type of input byte stream. For example, FileWriteStream.
 */
 template <typename Encoding, typename OutputByteStream>
 class EncodedOutputStream {
     RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
 public:
     typedef typename Encoding::Ch Ch;

     EncodedOutputStream(OutputByteStream& os, bool putBOM = true) : os_(os) {
         if (putBOM)
             Encoding::PutBOM(os_);
     }

     void Put(Ch c) { Encoding::Put(os_, c);  }
     void Flush() { os_.Flush(); }

     // Not implemented
     Ch Peek() const { RAPIDJSON_ASSERT(false); }
     Ch Take() { RAPIDJSON_ASSERT(false);  }
     size_t Tell() const { RAPIDJSON_ASSERT(false);  return 0; }
     Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
     size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

 private:
     EncodedOutputStream(const EncodedOutputStream&);
     EncodedOutputStream& operator=(const EncodedOutputStream&);

     OutputByteStream& os_;
 };

 #define RAPIDJSON_ENCODINGS_FUNC(x) UTF8<Ch>::x, UTF16LE<Ch>::x, UTF16BE<Ch>::x, UTF32LE<Ch>::x, UTF32BE<Ch>::x

 //! Input stream wrapper with dynamically bound encoding and automatic encoding detection.
 /*!
     \tparam CharType Type of character for reading.
     \tparam InputByteStream type of input byte stream to be wrapped.
 */
 template <typename CharType, typename InputByteStream>
 class AutoUTFInputStream {
     RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
 public:
     typedef CharType Ch;

     //! Constructor.
     /*!
         \param is input stream to be wrapped.
         \param type UTF encoding type if it is not detected from the stream.
     */
     AutoUTFInputStream(InputByteStream& is, UTFType type = kUTF8) : is_(&is), type_(type), hasBOM_(false) {
         DetectType();
         static const TakeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Take) };
         takeFunc_ = f[type_];
         current_ = takeFunc_(*is_);
     }

     UTFType GetType() const { return type_; }
     bool HasBOM() const { return hasBOM_; }

     Ch Peek() const { return current_; }
     Ch Take() { Ch c = current_; current_ = takeFunc_(*is_); return c; }
     size_t Tell() const { return is_->Tell(); }

     // Not implemented
     void Put(Ch) { RAPIDJSON_ASSERT(false); }
     void Flush() { RAPIDJSON_ASSERT(false); }
     Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
     size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

 private:
     AutoUTFInputStream(const AutoUTFInputStream&);
     AutoUTFInputStream& operator=(const AutoUTFInputStream&);

     // Detect encoding type with BOM or RFC 4627
     void DetectType() {
         // BOM (Byte Order Mark):
         // 00 00 FE FF  UTF-32BE
         // FF FE 00 00  UTF-32LE
         // FE FF        UTF-16BE
         // FF FE        UTF-16LE
         // EF BB BF     UTF-8

         const unsigned char* c = (const unsigned char *)is_->Peek4();
         if (!c)
             return;

         unsigned bom = c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24);
         hasBOM_ = false;
         if (bom == 0xFFFE0000)                  { type_ = kUTF32BE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
         else if (bom == 0x0000FEFF)             { type_ = kUTF32LE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
         else if ((bom & 0xFFFF) == 0xFFFE)      { type_ = kUTF16BE; hasBOM_ = true; is_->Take(); is_->Take();                           }
         else if ((bom & 0xFFFF) == 0xFEFF)      { type_ = kUTF16LE; hasBOM_ = true; is_->Take(); is_->Take();                           }
         else if ((bom & 0xFFFFFF) == 0xBFBBEF)  { type_ = kUTF8;    hasBOM_ = true; is_->Take(); is_->Take(); is_->Take();              }

         // RFC 4627: Section 3
         // "Since the first two characters of a JSON text will always be ASCII
         // characters [RFC0020], it is possible to determine whether an octet
         // stream is UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE) by looking
         // at the pattern of nulls in the first four octets."
         // 00 00 00 xx  UTF-32BE
         // 00 xx 00 xx  UTF-16BE
         // xx 00 00 00  UTF-32LE
         // xx 00 xx 00  UTF-16LE
         // xx xx xx xx  UTF-8

         if (!hasBOM_) {
             unsigned pattern = (c[0] ? 1 : 0) | (c[1] ? 2 : 0) | (c[2] ? 4 : 0) | (c[3] ? 8 : 0);
             switch (pattern) {
             case 0x08: type_ = kUTF32BE; break;
             case 0x0A: type_ = kUTF16BE; break;
             case 0x01: type_ = kUTF32LE; break;
             case 0x05: type_ = kUTF16LE; break;
             case 0x0F: type_ = kUTF8;    break;
             default: break; // Use type defined by user.
             }
         }

         // Runtime check whether the size of character type is sufficient. It only perform checks with assertion.
         switch (type_) {
         case kUTF8:
             // Do nothing
             break;
         case kUTF16LE:
         case kUTF16BE:
             RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
             break;
         case kUTF32LE:
         case kUTF32BE:
             RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
             break;
         default:
             RAPIDJSON_ASSERT(false);    // Invalid type
         }
     }

     typedef Ch (*TakeFunc)(InputByteStream& is);
     InputByteStream* is_;
     UTFType type_;
     Ch current_;
     TakeFunc takeFunc_;
     bool hasBOM_;
 };

 //! Output stream wrapper with dynamically bound encoding and automatic encoding detection.
 /*!
     \tparam CharType Type of character for writing.
     \tparam InputByteStream type of output byte stream to be wrapped.
 */
 template <typename CharType, typename OutputByteStream>
 class AutoUTFOutputStream {
     RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
 public:
     typedef CharType Ch;

     //! Constructor.
     /*!
         \param os output stream to be wrapped.
         \param type UTF encoding type.
         \param putBOM Whether to write BOM at the beginning of the stream.
     */
     AutoUTFOutputStream(OutputByteStream& os, UTFType type, bool putBOM) : os_(&os), type_(type) {
         // RUntime check whether the size of character type is sufficient. It only perform checks with assertion.
         switch (type_) {
         case kUTF16LE:
         case kUTF16BE:
             RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
             break;
         case kUTF32LE:
         case kUTF32BE:
             RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
             break;
         case kUTF8:
             // Do nothing
             break;
         default:
             RAPIDJSON_ASSERT(false);    // Invalid UTFType
         }

         static const PutFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Put) };
         putFunc_ = f[type_];

         if (putBOM)
             PutBOM();
     }

     UTFType GetType() const { return type_; }

     void Put(Ch c) { putFunc_(*os_, c); }
     void Flush() { os_->Flush(); }

     // Not implemented
     Ch Peek() const { RAPIDJSON_ASSERT(false); }
     Ch Take() { RAPIDJSON_ASSERT(false); }
     size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
     Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
     size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

 private:
     AutoUTFOutputStream(const AutoUTFOutputStream&);
     AutoUTFOutputStream& operator=(const AutoUTFOutputStream&);

     void PutBOM() {
         typedef void (*PutBOMFunc)(OutputByteStream&);
         static const PutBOMFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(PutBOM) };
         f[type_](*os_);
     }

     typedef void (*PutFunc)(OutputByteStream&, Ch);

     OutputByteStream* os_;
     UTFType type_;
     PutFunc putFunc_;
 };

 #undef RAPIDJSON_ENCODINGS_FUNC

 RAPIDJSON_NAMESPACE_END

 #ifdef __GNUC__
 RAPIDJSON_DIAG_POP
 #endif

 #endif // RAPIDJSON_FILESTREAM_H_
	// 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_ENCODEDSTREAM_H_
	#define RAPIDJSON_ENCODEDSTREAM_H_

	#include "rapidjson.h"

	#ifdef __GNUC__
	RAPIDJSON_DIAG_PUSH
	RAPIDJSON_DIAG_OFF(effc++)
	#endif

	RAPIDJSON_NAMESPACE_BEGIN

	//! Input byte stream wrapper with a statically bound encoding.
	/*!
	\tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
	\tparam InputByteStream Type of input byte stream. For example, FileReadStream.
	*/
	template <typename Encoding, typename InputByteStream>
	class EncodedInputStream {
	RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
	public:
	typedef typename Encoding::Ch Ch;

	EncodedInputStream(InputByteStream& is) : is_(is) {
	current_ = Encoding::TakeBOM(is_);
	}

	Ch Peek() const { return current_; }
	Ch Take() { Ch c = current_; current_ = Encoding::Take(is_); return c; }
	size_t Tell() const { return is_.Tell(); }

	// Not implemented
	void Put(Ch) { RAPIDJSON_ASSERT(false); }
	void Flush() { RAPIDJSON_ASSERT(false); }
	Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
	size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

	private:
	EncodedInputStream(const EncodedInputStream&);
	EncodedInputStream& operator=(const EncodedInputStream&);

	InputByteStream& is_;
	Ch current_;
	};

	//! Output byte stream wrapper with statically bound encoding.
	/*!
	\tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
	\tparam InputByteStream Type of input byte stream. For example, FileWriteStream.
	*/
	template <typename Encoding, typename OutputByteStream>
	class EncodedOutputStream {
	RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
	public:
	typedef typename Encoding::Ch Ch;

	EncodedOutputStream(OutputByteStream& os, bool putBOM = true) : os_(os) {
	if (putBOM)
	Encoding::PutBOM(os_);
	}

	void Put(Ch c) { Encoding::Put(os_, c); }
	void Flush() { os_.Flush(); }

	// Not implemented
	Ch Peek() const { RAPIDJSON_ASSERT(false); }
	Ch Take() { RAPIDJSON_ASSERT(false); }
	size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
	Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
	size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

	private:
	EncodedOutputStream(const EncodedOutputStream&);
	EncodedOutputStream& operator=(const EncodedOutputStream&);

	OutputByteStream& os_;
	};

	#define RAPIDJSON_ENCODINGS_FUNC(x) UTF8<Ch>::x, UTF16LE<Ch>::x, UTF16BE<Ch>::x, UTF32LE<Ch>::x, UTF32BE<Ch>::x

	//! Input stream wrapper with dynamically bound encoding and automatic encoding detection.
	/*!
	\tparam CharType Type of character for reading.
	\tparam InputByteStream type of input byte stream to be wrapped.
	*/
	template <typename CharType, typename InputByteStream>
	class AutoUTFInputStream {
	RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
	public:
	typedef CharType Ch;

	//! Constructor.
	/*!
	\param is input stream to be wrapped.
	\param type UTF encoding type if it is not detected from the stream.
	*/
	AutoUTFInputStream(InputByteStream& is, UTFType type = kUTF8) : is_(&is), type_(type), hasBOM_(false) {
	DetectType();
	static const TakeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Take) };
	takeFunc_ = f[type_];
	current_ = takeFunc_(*is_);
	}

	UTFType GetType() const { return type_; }
	bool HasBOM() const { return hasBOM_; }

	Ch Peek() const { return current_; }
	Ch Take() { Ch c = current_; current_ = takeFunc_(*is_); return c; }
	size_t Tell() const { return is_->Tell(); }

	// Not implemented
	void Put(Ch) { RAPIDJSON_ASSERT(false); }
	void Flush() { RAPIDJSON_ASSERT(false); }
	Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
	size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

	private:
	AutoUTFInputStream(const AutoUTFInputStream&);
	AutoUTFInputStream& operator=(const AutoUTFInputStream&);

	// Detect encoding type with BOM or RFC 4627
	void DetectType() {
	// BOM (Byte Order Mark):
	// 00 00 FE FF UTF-32BE
	// FF FE 00 00 UTF-32LE
	// FE FF UTF-16BE
	// FF FE UTF-16LE
	// EF BB BF UTF-8

	const unsigned char* c = (const unsigned char *)is_->Peek4();
	if (!c)
	return;

	unsigned bom = c[0] \| (c[1] << 8) \| (c[2] << 16) \| (c[3] << 24);
	hasBOM_ = false;
	if (bom == 0xFFFE0000) { type_ = kUTF32BE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
	else if (bom == 0x0000FEFF) { type_ = kUTF32LE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
	else if ((bom & 0xFFFF) == 0xFFFE) { type_ = kUTF16BE; hasBOM_ = true; is_->Take(); is_->Take(); }
	else if ((bom & 0xFFFF) == 0xFEFF) { type_ = kUTF16LE; hasBOM_ = true; is_->Take(); is_->Take(); }
	else if ((bom & 0xFFFFFF) == 0xBFBBEF) { type_ = kUTF8; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); }

	// RFC 4627: Section 3
	// "Since the first two characters of a JSON text will always be ASCII
	// characters [RFC0020], it is possible to determine whether an octet
	// stream is UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE) by looking
	// at the pattern of nulls in the first four octets."
	// 00 00 00 xx UTF-32BE
	// 00 xx 00 xx UTF-16BE
	// xx 00 00 00 UTF-32LE
	// xx 00 xx 00 UTF-16LE
	// xx xx xx xx UTF-8

	if (!hasBOM_) {
	unsigned pattern = (c[0] ? 1 : 0) \| (c[1] ? 2 : 0) \| (c[2] ? 4 : 0) \| (c[3] ? 8 : 0);
	switch (pattern) {
	case 0x08: type_ = kUTF32BE; break;
	case 0x0A: type_ = kUTF16BE; break;
	case 0x01: type_ = kUTF32LE; break;
	case 0x05: type_ = kUTF16LE; break;
	case 0x0F: type_ = kUTF8; break;
	default: break; // Use type defined by user.
	}
	}

	// Runtime check whether the size of character type is sufficient. It only perform checks with assertion.
	switch (type_) {
	case kUTF8:
	// Do nothing
	break;
	case kUTF16LE:
	case kUTF16BE:
	RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
	break;
	case kUTF32LE:
	case kUTF32BE:
	RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
	break;
	default:
	RAPIDJSON_ASSERT(false); // Invalid type
	}
	}

	typedef Ch (*TakeFunc)(InputByteStream& is);
	InputByteStream* is_;
	UTFType type_;
	Ch current_;
	TakeFunc takeFunc_;
	bool hasBOM_;
	};

	//! Output stream wrapper with dynamically bound encoding and automatic encoding detection.
	/*!
	\tparam CharType Type of character for writing.
	\tparam InputByteStream type of output byte stream to be wrapped.
	*/
	template <typename CharType, typename OutputByteStream>
	class AutoUTFOutputStream {
	RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
	public:
	typedef CharType Ch;

	//! Constructor.
	/*!
	\param os output stream to be wrapped.
	\param type UTF encoding type.
	\param putBOM Whether to write BOM at the beginning of the stream.
	*/
	AutoUTFOutputStream(OutputByteStream& os, UTFType type, bool putBOM) : os_(&os), type_(type) {
	// RUntime check whether the size of character type is sufficient. It only perform checks with assertion.
	switch (type_) {
	case kUTF16LE:
	case kUTF16BE:
	RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
	break;
	case kUTF32LE:
	case kUTF32BE:
	RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
	break;
	case kUTF8:
	// Do nothing
	break;
	default:
	RAPIDJSON_ASSERT(false); // Invalid UTFType
	}

	static const PutFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Put) };
	putFunc_ = f[type_];

	if (putBOM)
	PutBOM();
	}

	UTFType GetType() const { return type_; }

	void Put(Ch c) { putFunc_(*os_, c); }
	void Flush() { os_->Flush(); }

	// Not implemented
	Ch Peek() const { RAPIDJSON_ASSERT(false); }
	Ch Take() { RAPIDJSON_ASSERT(false); }
	size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
	Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
	size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }

	private:
	AutoUTFOutputStream(const AutoUTFOutputStream&);
	AutoUTFOutputStream& operator=(const AutoUTFOutputStream&);

	void PutBOM() {
	typedef void (*PutBOMFunc)(OutputByteStream&);
	static const PutBOMFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(PutBOM) };
	f[type_](*os_);
	}

	typedef void (*PutFunc)(OutputByteStream&, Ch);

	OutputByteStream* os_;
	UTFType type_;
	PutFunc putFunc_;
	};

	#undef RAPIDJSON_ENCODINGS_FUNC

	RAPIDJSON_NAMESPACE_END

	#ifdef __GNUC__
	RAPIDJSON_DIAG_POP
	#endif

	#endif // RAPIDJSON_FILESTREAM_H_