bool Checksum::add ( const char *  buf, size_t  len, bool  big_endian = true  )

inline

Definition at line 49 of file checksum.h.

References ___err___, addLoop(), addLoopSwapping(), buffer, end, gLog, and HandleCarryBits().

Referenced by add(), CompressedFitsWriter::addHeaderChecksum(), main(), ofits::Key::Out(), zfits::ReadBinaryRow(), fits::ReadBlock(), zfits::ReadCatalog(), CompressedFitsWriter::writeCatalog(), CompressedFitsWriter::writeCompressedDataToDisk(), CompressedFitsWriter::writeDrsCalib(), factofits::WriteDrsOffsetsTable(), ofits::WriteRow(), zfits::WriteRowToCopyFile(), and fits::WriteRowToCopyFile().

    {
        // Avoid overflows in carry bits
        if (len>262140) // 2^18-4
        {
            add(buf, 262140);
            return add(buf+262140, len-262140);
        }

        if (len%4>0)
        {
            std::ostringstream sout;
            sout << "Length " << len << " not dividable by 4";

#ifdef __EXCEPTIONS
            throw std::runtime_error(sout.str());
#else
            gLog << ___err___ << "ERROR - " << sout.str() << std::endl;
            return false;
#endif
        }

        const uint16_t *sbuf = reinterpret_cast<const uint16_t *>(buf);

        uint32_t *hilo  = reinterpret_cast<uint32_t*>(&buffer);


        const uint16_t *end = sbuf + len/2;

        if (big_endian)
            addLoopSwapping(sbuf, end, hilo);
        else
            addLoop(sbuf, end, hilo);
        /*const uint16_t *end = sbuf + len/2;
        while (1)
        {
            if (sbuf==end)
                break;

            hilo[0] += ntohs(*sbuf++);

            if (sbuf==end)
                break;

            hilo[1] += ntohs(*sbuf++);
        }*/

        HandleCarryBits();

        return true;
    }

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