/// <summary>
/// Returns the length of field in bits (-1 if the length is not fixed).
/// </summary>
private int GetFieldLength(FieldType field)
{
TypeDescription description = null;
if (!m_descriptions.TryGetValue(field.TypeName, out description))
{
return(-1);
}
uint count = 1;
if (field.LengthSpecified)
{
count = field.Length;
if (field.IsLengthInBytes)
{
count *= 8;
}
}
EnumeratedType enumerated = description as EnumeratedType;
if (enumerated != null)
{
if (enumerated.LengthInBitsSpecified)
{
return(enumerated.LengthInBits * ((int)count));
}
}
else
{
OpaqueType opaque = description as OpaqueType;
if (opaque != null)
{
if (opaque.LengthInBitsSpecified)
{
return(opaque.LengthInBits * ((int)count));
}
}
}
return(-1);
}
/// <summary>
/// Validates a type description.
/// </summary>
private void ValidateDescription(TypeDescription description)
{
OpaqueType opaque = description as OpaqueType;
if (opaque != null)
{
if (!opaque.LengthInBitsSpecified)
{
m_warnings.Add(String.Format(CultureInfo.InvariantCulture,
"Warning: The opaque type '{0}' does not have a length specified.", description.Name));
}
if (IsNull(opaque.Documentation))
{
m_warnings.Add(String.Format(CultureInfo.InvariantCulture,
"Warning: The opaque type '{0}' does not have any documentation.", description.Name));
}
}
EnumeratedType enumerated = description as EnumeratedType;
if (enumerated != null)
{
if (!enumerated.LengthInBitsSpecified)
{
throw Exception("The enumerated type '{0}' does not have a length specified.", description.Name);
}
}
StructuredType structure = description as StructuredType;
if (structure != null)
{
if (structure.Field == null || structure.Field.Length == 0)
{
structure.Field = new FieldType[0];
}
int bitCount = 0;
Dictionary <string, FieldType> fields = new Dictionary <string, FieldType>();
for (int ii = 0; ii < structure.Field.Length; ii++)
{
FieldType field = structure.Field[ii];
ValidateField(structure, fields, field);
int fieldLength = GetFieldLength(field);
if (fieldLength == -1)
{
if (bitCount % 8 != 0)
{
throw Exception("Field '{1}' in structured type '{0}' is not aligned on a byte boundary .",
description.Name, field.Name);
}
bitCount = 0;
}
else
{
bitCount += fieldLength;
}
fields.Add(field.Name, field);
}
}
}
