binarywriter.cpp

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#include "./binarywriter.h"
 
#include "../conversion/conversionexception.h"
 
#include <cstring>
#include <memory>
 
using namespace std;
 
namespace CppUtilities {
 
void BinaryWriter::setStream(ostream *stream, bool giveOwnership)
{
    if (m_ownership) {
        delete m_stream;
    }
    if (stream) {
        m_stream = stream;
        m_ownership = giveOwnership;
    } else {
        m_stream = nullptr;
        m_ownership = false;
    }
}
 
void BinaryWriter::writeVariableLengthInteger(std::uint64_t value, void (*getBytes)(std::uint64_t, char *))
{
    std::uint64_t boundCheck = 0x80;
    std::uint8_t prefixLength = 1;
    for (; boundCheck != 0x8000000000000000; boundCheck <<= 7, ++prefixLength) {
        if (value < boundCheck) {
            getBytes(value | boundCheck, m_buffer);
            break;
        }
    }
    if (prefixLength == 9) {
        throw ConversionException("The variable-length integer to be written exceeds the maximum.");
    }
    m_stream->write(m_buffer + 8 - prefixLength, prefixLength);
}
 
} // namespace CppUtilities