64 lines
1.8 KiB
C++
64 lines
1.8 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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namespace CppUtilities {
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/*!
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* \class 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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* \sa For automatic deserialization of structs, see https://github.com/Martchus/reflective-rapidjson.
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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 Specifies whether the writer should take ownership.
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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 specified integer \a value. Conversion to bytes is done using the specified function.
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*/
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void BinaryWriter::writeVariableLengthInteger(std::uint64_t value, void (*getBytes)(std::uint64_t, char *))
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{
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std::uint64_t boundCheck = 0x80;
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std::uint8_t prefixLength = 1;
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for (; boundCheck != 0x8000000000000000; boundCheck <<= 7, ++prefixLength) {
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if (value < boundCheck) {
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getBytes(value | boundCheck, m_buffer);
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break;
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}
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}
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if (prefixLength == 9) {
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throw ConversionException("The variable-length integer to be written exceeds the maximum.");
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}
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m_stream->write(m_buffer + 8 - prefixLength, prefixLength);
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}
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} // namespace CppUtilities
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