/// <inheritdoc />
public override CtfFieldValue Read(IPacketReader reader, CtfFieldValue parent = null)
{
Guard.NotNull(reader, nameof(reader));
// todo:handle dynamic scoped tags
if (parent == null)
{
throw new CtfPlaybackException("No parent specified for variant. Unable to find variant tag for reading.");
}
var tagFieldValue = parent.FindField(this.Switch);
if (tagFieldValue == null)
{
throw new CtfPlaybackException($"Unable to find variant tag for reading: {this.Switch}.");
}
if (!(tagFieldValue is CtfEnumValue tagEnum))
{
throw new CtfPlaybackException($"The tag field is not an enumeration value: {this.Switch}.");
}
var variantTypeToRead = GetVariant(tagEnum.Value);
if (variantTypeToRead == null)
{
throw new CtfPlaybackException($"The enumeration value did not match a field in the variant: {tagEnum.Value}.");
}
var variantValue = variantTypeToRead.Read(reader, parent);
return(new CtfVariantValue(variantValue, tagEnum.Value, tagEnum));
}
/// <inheritdoc />
public override CtfFieldValue Read(IPacketReader reader, CtfFieldValue parent = null)
{
Guard.NotNull(reader, nameof(reader));
// this will align to the underlying type when we do a Type.read
List <CtfFieldValue> values = new List <CtfFieldValue>();
try
{
IntegerLiteral integerValue;
if (IntegerLiteralString.TryCreate(this.Index, out var integerStringIndex))
{
integerValue = new IntegerLiteral(integerStringIndex);
}
else
{
Debug.Assert(parent != null);
if (parent == null)
{
return(null);
}
var indexField = parent.FindField(this.Index);
if (!(indexField is CtfIntegerValue indexValue))
{
Debug.Assert(false, "is this a valid value?");
return(null);
}
integerValue = indexValue.Value;
}
if (integerValue.Signed)
{
if (integerValue.ValueAsLong < 0)
{
// we shouldn't hit this, it should be caught before now
throw new CtfPlaybackException("Negative array indexing is not supported.");
}
for (long x = 0; x < integerValue.ValueAsLong; x++)
{
values.Add(this.Type.Read(reader));
}
return(new CtfArrayValue(values.ToArray()));
}
for (ulong x = 0; x < integerValue.ValueAsUlong; x++)
{
values.Add(this.Type.Read(reader));
}
return(new CtfArrayValue(values.ToArray()));
}
catch (ArgumentException)
{
Debug.Assert(false, "What did I miss?");
return(null);
}
}
