96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
#include "./binarywriter.h"
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#include "../conversion/conversionexception.h"
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#include <cstring>
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#include <memory>
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using namespace std;
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using namespace IoUtilities;
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using namespace ConversionUtilities;
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/*!
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* \class IoUtilities::BinaryWriter
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* \brief Writes primitive data types to a std::ostream.
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* \remarks Supports both, little endian and big endian.
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*/
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/*!
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* \brief Constructs a new BinaryWriter.
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* \param stream Specifies the stream to write to.
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*/
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BinaryWriter::BinaryWriter(ostream *stream) :
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m_stream(stream),
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m_ownership(false)
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{}
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/*!
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* \brief Copies the specified BinaryWriter.
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* \remarks The copy will not take ownership over the stream.
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*/
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BinaryWriter::BinaryWriter(const BinaryWriter &other) :
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m_stream(other.m_stream),
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m_ownership(false)
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{}
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/*!
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* \brief Destroys the BinaryWriter.
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*/
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BinaryWriter::~BinaryWriter()
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{
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if(m_ownership) {
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delete m_stream;
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}
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}
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/*!
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* \brief Assigns the stream the writer will write to when calling one of the write-methods.
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*
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* You can assign a null pointer when ensuring that none of the write-methods is called
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* until a stream is assigned.
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*
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* \param stream Specifies the stream to be assigned.
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* \param giveOwnership Indicated whether the reader should take ownership (default is false).
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*
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* \sa setStream()
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*/
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void BinaryWriter::setStream(ostream *stream, bool giveOwnership)
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{
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if(m_ownership) {
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delete m_stream;
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}
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if(stream) {
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m_stream = stream;
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m_ownership = giveOwnership;
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} else {
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m_stream = nullptr;
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m_ownership = false;
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}
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}
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/*!
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* \brief Writes the length of a string and the string itself to the current stream.
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*
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* Advances the current position of the stream by the length of the string plus the size of the length prefix.
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*/
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void BinaryWriter::writeLengthPrefixedString(const string &value)
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{
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size_t length = value.length();
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if(length < 0x80) {
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m_buffer[0] = 0x80 | length;
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m_stream->write(m_buffer, 1);
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} else if(length < 0x4000) {
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BE::getBytes(static_cast<uint16>(0x4000 | length), m_buffer);
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m_stream->write(m_buffer, 2);
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} else if(length < 0x200000) {
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BE::getBytes(static_cast<uint32>(0x200000 | length), m_buffer);
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m_stream->write(m_buffer + 1, 3);
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} else if(length < 0x10000000) {
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BE::getBytes(static_cast<uint32>(0x10000000 | length), m_buffer);
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m_stream->write(m_buffer, 4);
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} else {
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throw ConversionException("The size of the string exceeds the maximum.");
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}
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m_stream->write(value.c_str(), length);
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}
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