/// <summary>
/// Implements unmarshaling logic for most of the TPM object types.
/// Can be overridden if a custom unmarshaling logic is required (e.g.
/// when unmarshaling of a field depends on other field's value).
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
internal virtual void ToHost(Marshaller m)
{
dbg.Indent();
var members = GetFieldsToMarshal(true);
uint mshlStartPos = m.GetGetPos();
for (int i = 0; i < members.Length; ++i)
{
TpmStructMemberInfo memInfo = members[i];
Type memType = Globs.GetMemberType(memInfo);
var wt = members[i].WireType;
int size = -1;
switch (wt)
{
case MarshalType.Union:
{
dbg.Trace("Union " + memType.Name +
" with selector " + memInfo.Tag.Value);
var elt = UnionElementFromSelector(memType, memInfo.Tag.Value);
memInfo.Value = m.Get(elt, memType.Name);
break;
}
case MarshalType.FixedLengthArray:
{
object arr = Globs.GetMember(memInfo, this);
memInfo.Value = m.GetArray(memType.GetElementType(),
(arr as Array).Length, memInfo.Name);
break;
}
case MarshalType.VariableLengthArray:
{
size = m.GetSizeTag(memInfo.SizeLength, memInfo.SizeName);
UnmarshalArray(m, memInfo, memType, size);
break;
}
case MarshalType.EncryptedVariableLengthArray:
{
uint unmarshaled = m.GetGetPos() - mshlStartPos;
size = m.SizedStructLen[m.SizedStructLen.Count - 1] - (int)unmarshaled;
UnmarshalArray(m, memInfo, memType, size);
break;
}
case MarshalType.SizedStruct:
{
size = m.GetSizeTag(memInfo.SizeLength, memInfo.SizeName);
if (size == 0)
{
break;
}
m.SizedStructLen.Add(size);
memInfo.Value = m.Get(memType, memInfo.Name);
int unmSize = Marshaller.GetTpmRepresentation(memInfo.Value).Length;
if (unmSize != size)
{
if (unmSize < size && memType.Name == "TpmPublic")
{
var pub = memInfo.Value as TpmPublic;
var label = Marshaller.GetTpmRepresentation(pub.unique);
var context = m.GetArray(typeof(byte), size - unmSize, "")
as byte[];
pub.unique = new TpmDerive(label, context);
}
else
{
var msg = string.Format("Invalid size {0} (instead of "
+ "{1}) for unmarshaled {2}.{3}",
unmSize, size, this.GetType(), memInfo.Name);
throw new TssException(msg);
}
}
m.SizedStructLen.RemoveAt(m.SizedStructLen.Count - 1);
break;
}
default:
// Only attempt unmarshaling a field, if it is not sized or
// if its size is non-zero.
if (memInfo.Tag == null ||
memInfo.Tag.GetValueAsUInt() != 0)
{
memInfo.Value = m.Get(memType, memInfo.Name);
}
break;
}
dbg.Trace((i + 1) + ": " + wt + " " + memInfo.Name +
(size != -1 ? " of size " + size : ""));
// Some property values are dynamically obtained from their linked fields.
// Correspondingly, they do not have a setter, so we bypass them here.
Debug.Assert(wt != MarshalType.LengthOfStruct && wt != MarshalType.ArrayCount);
if (wt != MarshalType.UnionSelector)
{
Globs.SetMember(memInfo, this, memInfo.Value);
}
}
dbg.Unindent();
}
internal virtual void ToHost(Marshaller m)
{
var members = GetFieldsToMarshal(true);
dbg.Indent();
for (int i = 0; i < members.Length; ++i)
{
TpmStructMemberInfo memInfo = members[i];
Type memType = Globs.GetMemberType(memInfo);
var wt = members[i].WireType;
switch (wt)
{
case MarshalType.Union:
{
dbg.Trace("Union " + memType.Name + " with selector " + memInfo.Tag.Value);
memInfo.Value = m.Get(UnionElementFromSelector(memType, memInfo.Tag.Value), memType.Name);
break;
}
case MarshalType.FixedLengthArray:
{
object arr = Globs.GetMember(memInfo, this);
memInfo.Value = m.GetArray(memType.GetElementType(), (arr as Array).Length, memInfo.Name);
break;
}
case MarshalType.VariableLengthArray:
{
int size = m.GetSizeTag(memInfo.SizeLength, memInfo.SizeName);
memInfo.Value = m.GetArray(memType.GetElementType(), size, memInfo.Name);
Debug.Assert(size == ((Array)memInfo.Value).Length);
dbg.Trace("Received Array " + memInfo.Name + " of size " + size);
break;
}
case MarshalType.SizedStruct:
{
int size = m.GetSizeTag(memInfo.SizeLength, memInfo.SizeName);
if (size != 0)
{
memInfo.Value = m.Get(memType, memInfo.Name);
Debug.Assert(size == Marshaller.GetTpmRepresentation(memInfo.Value).Length);
}
dbg.Trace("Received Struct " + memInfo.Name + " of size " + size);
break;
}
default:
// Only attempt unmarshaling a field, if it is not sized or
// if its size is non-zero.
if (memInfo.Tag == null ||
memInfo.Tag.GetValueAsUInt() != 0)
{
memInfo.Value = m.Get(memType, memInfo.Name);
}
break;
}
dbg.Trace((i + 1) + ": " + memInfo.Name + " = " + memInfo.Value);
// Some property values are dynamically obtained from their linked fields.
// Correspondingly, they do not have a setter, so we bypass them here.
Debug.Assert(wt != MarshalType.LengthOfStruct && wt != MarshalType.ArrayCount);
if (wt != MarshalType.UnionSelector)
{
Globs.SetMember(memInfo, this, memInfo.Value);
}
}
dbg.Unindent();
}
