///<summary>
/// This method is responsible to convert the byte[] received from the backend
/// to the corresponding NpgsqlType.
/// The given TypeInfo is called upon to do the conversion.
/// If no TypeInfo object is provided, no conversion is performed.
/// </summary>
public static Object ConvertBackendBytesToSystemType(NpgsqlBackendTypeInfo TypeInfo, Byte[] data, Int32 fieldValueSize,
Int32 typeModifier)
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ConvertBackendBytesToStytemType");
if (TypeInfo != null)
{
return(TypeInfo.ConvertBackendBinaryToNative(data, fieldValueSize, typeModifier));
}
else
{
return(data);
}
}
/// <summary>
/// Recursively populates an array from PB binary data representation.
/// </summary>
private void PopulateArrayFromBinaryArray(NpgsqlBackendTypeInfo TypeInfo, byte[] backendData, Int32 fieldValueSize, Int32 TypeModifier, ref int dataOffset, int[] dimLengths, int[] dimLBounds, int dimOffset, Array dst, int[] dstOffsets)
{
int dimensionLBound = dimLBounds[dimOffset];
int end = dimensionLBound + dimLengths[dimOffset];
if (dimOffset < dimLengths.Length - 1)
{
// Drill down recursively until we hit a single dimension array.
for (int i = dimensionLBound; i < end; i++)
{
dstOffsets[dimOffset] = i;
PopulateArrayFromBinaryArray(TypeInfo, backendData, fieldValueSize, TypeModifier, ref dataOffset, dimLengths, dimLBounds, dimOffset + 1, dst, dstOffsets);
}
}
else
{
// Populate a single dimension array.
for (int i = dimensionLBound; i < end; i++)
{
// Sanity check.
if (backendData.Length < dataOffset + 4)
{
throw new NpgsqlException("Out of backend data while reading binary array");
}
int elementLength;
// Each element consists of an int length identifier, followed by that many bytes of raw data.
// Length -1 indicates a NULL value, and is naturally followed by no data.
elementLength = PGUtil.ReadInt32(backendData, dataOffset);
dataOffset += 4;
if (elementLength == -1)
{
// This currently throws an exception on value types.
dst.SetValue(DBNull.Value, dstOffsets);
}
else
{
// Sanity check.
if (backendData.Length < dataOffset + elementLength)
{
throw new NpgsqlException("Out of backend data while reading binary array");
}
byte[] elementBinary;
// Get element data from backend data.
elementBinary = PGUtil.ReadBytes(backendData, dataOffset, elementLength);
object elementNative;
elementNative = _elementConverter.ConvertBackendBinaryToNative(elementBinary, fieldValueSize, TypeModifier);
dstOffsets[dimOffset] = i;
dst.SetValue(elementNative, dstOffsets);
dataOffset += elementLength;
}
}
}
}
