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cpp-utilities/io/binarywriter.cpp

95 lines
2.4 KiB

#include "./binarywriter.h"
#include "../conversion/conversionexception.h"
#include <cstring>
#include <memory>
using namespace std;
using namespace IoUtilities;
using namespace ConversionUtilities;
/*!
* \class IoUtilities::BinaryWriter
* \brief Writes primitive data types to a std::ostream.
* \remarks Supports both, little endian and big endian.
*/
/*!
* \brief Constructs a new BinaryWriter.
* \param stream Specifies the stream to write to.
*/
BinaryWriter::BinaryWriter(ostream *stream)
: m_stream(stream)
, m_ownership(false)
{
}
/*!
* \brief Copies the specified BinaryWriter.
* \remarks The copy will not take ownership over the stream.
*/
BinaryWriter::BinaryWriter(const BinaryWriter &other)
: m_stream(other.m_stream)
, m_ownership(false)
{
}
/*!
* \brief Destroys the BinaryWriter.
*/
BinaryWriter::~BinaryWriter()
{
if (m_ownership) {
delete m_stream;
}
}
/*!
* \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 Indicated whether the reader should take ownership (default is false).
*
* \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 length of a string and the string itself to the current stream.
*
* Advances the current position of the stream by the length of the string plus the size of the length prefix.
*/
void BinaryWriter::writeLengthPrefixedString(const string &value)
{
const uint64 size = value.size();
uint64 boundCheck = 0x80;
byte prefixLength = 1;
for (; boundCheck != 0x8000000000000000; boundCheck <<= 7, ++prefixLength) {
if (size < boundCheck) {
BE::getBytes(size | boundCheck, m_buffer);
break;
}
}
if (prefixLength == 9) {
throw ConversionException("The size of the string exceeds the maximum.");
}
m_stream->write(m_buffer + 8 - prefixLength, prefixLength);
m_stream->write(value.data(), static_cast<streamsize>(size));
}