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#include "./binarywriter.h"
#include "../conversion/conversionexception.h"
using namespace std;
namespace CppUtilities {
/*!
* \class BinaryWriter
* \brief Writes primitive data types to a std::ostream.
* \remarks Supports both, little endian and big endian.
* \sa For automatic deserialization of structs, see https://github.com/Martchus/reflective-rapidjson.
*/
/*!
* \brief Assigns the stream the writer will write to when calling one of the write-methods.
*
* You can assign a null pointer when ensuring that none of the write-methods is called
* until a stream is assigned.
*
* \param stream Specifies the stream to be assigned.
* \param giveOwnership Specifies whether the writer should take ownership.
*
* \sa setStream()
*/
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;
}
}
/*!
* \brief Writes the specified integer \a value. Conversion to bytes is done using the specified function.
*/
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
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