///////////////////////////////////////////////////////////////////////////////
/// Reads the copy operation state from a buffer
///
/// \param [in] const BYTEVECTOR& lambdaBuffer - the buffer to read from
/// \param [in,out] PULONG pLambdaBufPos - the position in the buffer to read from
/// \return std::unique_ptr<CCopyOperation> - the deserialised copy operation,
/// or nullptr if lambdaBuffer did not contain a CCopyOperation at
/// position *pLambdaBufPos
///////////////////////////////////////////////////////////////////////////////
std::unique_ptr<CCopyOperation> CCopyOperation::TryDeserialise(const CDataBuffer& copyFromBuffer, IDataReader& lambdaReader)
{
// check the type of the operation
if (lambdaReader.PeekByte() != COPY_OPERATION_TYPE)
{
// not a copy op
return nullptr;
}
lambdaReader.ReadByte();
// get length
ULONG nNumBytesToCopy = lambdaReader.ReadULONG();
// get dictionary buffer offset to copy from
ULONG nOffset = lambdaReader.ReadULONG();
std::unique_ptr<CCopyOperation> pCopyOp(
new CCopyOperation(
copyFromBuffer,
CDataBuffer(copyFromBuffer.Buffer() + nOffset, nNumBytesToCopy)
)
);
#ifdef DEBUG_OUTPUT
std::cout << "<CopyOp><Offset>" << nOffset << "</Offset><Length>" << nNumBytesToCopy << "</Length></CopyOp>" << std::endl;
#endif
return pCopyOp;
}
