C++ encoder函数代码示例

	void write_argument_value(tstring const& data)
	{
		// http://www.w3.org/TR/REC-xml/#NT-AttValue
		// says that in att value, we escape " ' < and &
		static const tstring patterns = "\"'<&";
		static const tstring replacements[] = {
			"&quot;", "&apos;", "&lt;", "&amp;"
		};
		xml_content_encoder encoder(data, patterns, replacements);
		while( encoder.has_next() ) {
			tinfra::tstring chunk = encoder.next();
			out_->write(chunk.data(), chunk.size());
		}
	}

    const std::string createHeader()
    {
        // TODO: Some sane code to represent JSON objects
        std::string header = "{\"alg\":\""+_alg+"\",\"typ\":\""+_typ+"\"}";

        Log::info("JWT Header: " + header);
        std::ostringstream ostr;
        Poco::OutputLineEndingConverter lineEndingConv(ostr, "");
        Poco::Base64Encoder encoder(lineEndingConv);
        encoder << header;
        encoder.close();

        return ostr.str();
    }

void ArchExecutor::EncodeFiles(Options* options)
{
	int filesCount = options->Files->GetCount();
	if (options->Stdin || filesCount == 0)
	{
		LzwEncoder encoder(stdin, stdout);
		encoder.Encode("");
		return;
	}

	for(int i = 0; i < filesCount; i++)
	{
		char* path = options->Files->GetElement(i);

		FILE* inputFile = fopen(path, "rb");
		if (IsCompressedFile(inputFile))
		{
			fclose(inputFile);
			continue;
		}

		char* compressedPath = new char[PATH_MAX];
		int pathLength = sprintf (compressedPath, "%s.ar", path);
		if (pathLength >= PATH_MAX) 
		{
			printf ("Path length has got too long.\n");
			continue;
		}

		FILE* outputFile = fopen(compressedPath, "wb");

		LzwEncoder encoder(inputFile, outputFile);
		encoder.Encode(GetName(path));
		fclose(inputFile);
		remove(path);
	}
}

void VlrCompressor::done()
{
    // Close and clear the point encoder.
    m_encoder->done();
    m_encoder.reset();

    newChunk();

    // Save our current position.  Go to the location where we need
    // to write the chunk table offset at the beginning of the point data.

    uint64_t chunkTablePos = htole64((uint64_t) m_stream.m_buf.size());
    // We need to add the offset given a construction time since
    // we did not use a stream to write the header and vlrs
    uint64_t trueChunkTablePos = htole64((uint64_t) m_stream.m_buf.size() +  m_offsetToData);

    // Equivalent of stream.seekp(m_chunkInfoPos); stream << chunkTablePos
    memcpy(&m_stream.m_buf[m_chunkInfoPos], (char*) &trueChunkTablePos, sizeof(uint64_t));

    // Move to the start of the chunk table.
    // Which in our case is the end of the m_stream vector

    // Write the chunk table header in two steps
    // 1. Push bytes into the stream
    // 2. memcpy the data into the pushed bytes
    unsigned char skip[2 * sizeof(uint32_t)] = {0};
    m_stream.putBytes(skip, sizeof(skip));
    uint32_t version = htole32(0);
    uint32_t chunkTableSize = htole32((uint32_t) m_chunkTable.size());

    memcpy(&m_stream.m_buf[chunkTablePos], &version, sizeof(uint32_t));
    memcpy(&m_stream.m_buf[chunkTablePos + sizeof(uint32_t)], &chunkTableSize, sizeof(uint32_t));

    // Encode and write the chunk table.
    // OutputStream outputStream(m_stream);
    TypedLazPerfBuf<uint8_t> outputStream(m_stream);
    Encoder encoder(outputStream);
    laszip::compressors::integer compressor(32, 2);
    compressor.init();

    uint32_t predictor = 0;
    for (uint32_t chunkSize : m_chunkTable)
    {
        chunkSize = htole32(chunkSize);
        compressor.compress(encoder, predictor, chunkSize, 1);
        predictor = chunkSize;
    }
    encoder.done();
}

// -----------------------------------------------------------------------------
// CWimCertHandler::ParseCertPublicKeyL
// Parse public key from certificate.
// -----------------------------------------------------------------------------
//
void CWimCertHandler::ParseCertPublicKeyL(
    const TDesC8& aCertData,
    TDes8& aPublicKey,
    const TUint8 aCertType ) const
    {
    _WIMTRACE2(_L("WIM | WIMServer | CWimPublicKeyHandler::ParseCertPublicKeyL | Begin, type %d"), aCertType);
    CCertificate* certificate = NULL;
    CRSAPublicKey* publicKey = NULL;

    switch ( aCertType )
        {
        case WIMI_CT_WTLS:
            {
            certificate = CWTLSCertificate::NewLC( aCertData );
            publicKey = CWTLSRSAPublicKey::NewLC( certificate->PublicKey().KeyData() );
            break;
            }

        case WIMI_CT_X509:
            {
            certificate = CX509Certificate::NewLC( aCertData );
            publicKey = CX509RSAPublicKey::NewLC( certificate->PublicKey().KeyData() );
            break;
            }
        default:
            {
            _WIMTRACE2(_L("WIM|WIMServer|CWimCertHandler::ParseCertPublicKeyL, type %d not supported"), aCertType);
            User::Leave( KErrNotSupported );
            break;
            }
        }

    TX509RSAKeyEncoder encoder( *publicKey, ESHA1 );
    CASN1EncBase* encoded = encoder.EncodeKeyLC();

    TUint pos = 0;
    aPublicKey.SetLength( KPublicKeyLength );
    // Check that Max. length is not exceeded
    if ( encoded->LengthDER() > static_cast< TUint >( KPublicKeyLength ) )
        {
        _WIMTRACE(_L("WIM|WIMServer|CWimCertHandler::ParseCertPublicKeyL, too long public key"));
        User::Leave( KErrBadDescriptor );
        }
    // Write encoded key to prealloced buffer
    encoded->WriteDERL( aPublicKey, pos );

    CleanupStack::PopAndDestroy( 3, certificate );  // encoded, publicKey, certificate
    _WIMTRACE(_L("WIM | WIMServer | CWimPublicKeyHandler::ParseCertPublicKeyL | End"));
    }

/*
encoder - decoder
cbr or cq
ppinloop
rebuild.yuv size.txt ssim.txt
*/
void run_codec_test(char argc, char** argv)
{
	CX264Encoder e;

	set_default_cmd();    
	parse_cmd_enc( argc, argv);
	if(1==verfy_cmd())
	{
		cmd_help();
	}

	init_encoder( &e );

    encoder( &e, &gCmd);
}

	std::string lzwTest(const std::string& str) {
		std::ostringstream oss;
		LzwEncoder encoder(std::make_shared<Writer>(&oss));
		for (auto c : str) {
			encoder.encode(c);
		}
		encoder.flush();

		std::istringstream iss(oss.str());
		LzwDecoder decoder(std::make_shared<Reader>(&iss));
		std::ostringstream result;
		decoder.decode(result);

		return result.str();
	}

void URLEncoderTest::DecodeTest()
{
	URLEncoder encoder("encoder");
	String Request = "Dies%20ist%0A%20%22%25%26%3F%2F%5C%23%7B%7DeinTestString";
	String Answer, expected;
	encoder.DoDecode(Answer, Request);
	expected = "Dies ist\n ";
	expected.Append('"').Append("%&?/\\#{}einTestString");
	assertEqual( expected, Answer );
	Request = "Dies+ist%0A+%22%25%26%3F%2F%5C%23%7B%7Dein+Test+String";
	encoder.DoDecode(Answer, Request);
	expected = "Dies ist\n ";
	expected.Append('"').Append("%&?/\\#{}ein Test String");
	assertEqual( expected, Answer );
}

	void write_content_bytes(tstring const& data)
	{
		// http://www.w3.org/TR/REC-xml/#dt-chardata
		// says that only < and & are escaped 
		// in normal text
		static const tstring patterns = "<&";
		static const tstring replacements[] = {
			"&lt;", "&amp;"
		};
		xml_content_encoder encoder(data, patterns, replacements); 
		while( encoder.has_next() ) {
			tinfra::tstring chunk = encoder.next();
			out_->write(chunk.data(), chunk.size());
		}
	}

void MailMessage::writeEncoded(std::istream& istr, std::ostream& ostr, ContentTransferEncoding encoding) const
{
	switch (encoding)
	{
	case ENCODING_7BIT:
	case ENCODING_8BIT:
		StreamCopier::copyStream(istr, ostr);
		break;
	case ENCODING_QUOTED_PRINTABLE:
		{
			QuotedPrintableEncoder encoder(ostr);
			StreamCopier::copyStream(istr, encoder);
			encoder.close();
		}
		break;
	case ENCODING_BASE64:
		{
			Base64Encoder encoder(ostr);
			StreamCopier::copyStream(istr, encoder);
			encoder.close();
		}
		break;
	}
}

void compressAdaptive(std::istream& in, std::ostream& out) {
	const char* header = "AC\x00";
	out.write(header, 3);

	ArithmeticEncoder encoder(std::make_shared<BitStreamWriter>(&out));
	AdaptiveDataModel dataModel(NUM_SYMBOLS);
	for (;;) {
		int c = in.get();
		if (c == std::char_traits<char>::eof()) {
			encoder.encode(NUM_SYMBOLS - 1, &dataModel);
			break;
		}

		encoder.encode(c, &dataModel);
	}
}

  static Block
  makeBlock(uint32_t type, Iterator first, Iterator last)
  {
    EncodingEstimator estimator;
    size_t valueLength = last - first;
    size_t totalLength = valueLength;
    totalLength += estimator.prependVarNumber(valueLength);
    totalLength += estimator.prependVarNumber(type);

    EncodingBuffer encoder(totalLength, 0);
    encoder.prependRange(first, last);
    encoder.prependVarNumber(valueLength);
    encoder.prependVarNumber(type);

    return encoder.block();
  }

void main(int argc, char *argv[])
{
    void encoder();
    static void usage(char*);
    
    if (argc != 3)
	usage(argv[0]);
#ifdef __ADSP21000__
    initx();
#else
    ifile_name = argv[1];
    xfile_name = argv[2];
#endif
    ffase = -4;
    encoder();
}

void		saveImage (const unsigned char* pixels,const unsigned char* palette,size_t width,size_t height,size_t channels,const std::string& strFile)
{
    std::auto_ptr<ImageEncoder> encoder ( getImageEncoder (strFile) );
    if (!encoder.get())
            throw std::runtime_error("Unsupported file format "+strFile);

    encoder->setWidth (width);
    encoder->setHeight (height);
    encoder->setChannels (channels);
    encoder->setPalette (palette);

    encoder->write_open(strFile);
    encoder->write_header();
    encoder->write_data (pixels,palette);
    encoder->write_close ();
}

    const std::string createPayload()
    {
        std::time_t curtime = Poco::Timestamp().epochTime();
        std::string exptime = std::to_string(curtime + 3600);

        // TODO: Some sane code to represent JSON objects
        std::string payload = "{\"iss\":\""+_iss+"\",\"sub\":\""+_sub+"\",\"aud\":\""+_aud+"\",\"nme\":\""+_name+"\",\"exp\":\""+exptime+"\"}";

        Log::info("JWT Payload: " + payload);
        std::ostringstream ostr;
        Poco::OutputLineEndingConverter lineEndingConv(ostr, "");
        Poco::Base64Encoder encoder(lineEndingConv);
        encoder << payload;
        encoder.close();

        return ostr.str();
    }