public override SubTable GetSubTable(uint i)
{
if (i >= SubTableCount)
{
throw new ArgumentOutOfRangeException();
}
SubTable st = null;
uint stOffset = m_offsetLookupTable + (uint)GetSubTableOffset(i);
if ((string)m_tag == "GPOS")
{
switch (LookupType)
{
case 1: st = new val_GPOS.SinglePos_val (stOffset, m_bufTable); break;
case 2: st = new val_GPOS.PairPos_val (stOffset, m_bufTable); break;
case 3: st = new val_GPOS.CursivePos_val (stOffset, m_bufTable); break;
case 4: st = new val_GPOS.MarkBasePos_val (stOffset, m_bufTable); break;
case 5: st = new val_GPOS.MarkLigPos_val (stOffset, m_bufTable); break;
case 6: st = new val_GPOS.MarkMarkPos_val (stOffset, m_bufTable); break;
case 7: st = new val_GPOS.ContextPos_val (stOffset, m_bufTable); break;
case 8: st = new val_GPOS.ChainContextPos_val(stOffset, m_bufTable); break;
case 9: st = new val_GPOS.ExtensionPos_val (stOffset, m_bufTable); break;
}
}
else if ((string)m_tag == "GSUB")
{
switch (LookupType)
{
case 1: st = new val_GSUB.SingleSubst_val (stOffset, m_bufTable); break;
case 2: st = new val_GSUB.MultipleSubst_val (stOffset, m_bufTable); break;
case 3: st = new val_GSUB.AlternateSubst_val (stOffset, m_bufTable); break;
case 4: st = new val_GSUB.LigatureSubst_val (stOffset, m_bufTable); break;
case 5: st = new val_GSUB.ContextSubst_val (stOffset, m_bufTable); break;
case 6: st = new val_GSUB.ChainContextSubst_val(stOffset, m_bufTable); break;
case 7: st = new val_GSUB.ExtensionSubst_val (stOffset, m_bufTable); break;
case 8: st = new val_GSUB.ReverseChainSubst_val(stOffset, m_bufTable); break;
}
}
else
{
throw new InvalidOperationException("unknown table type");
}
return st;
}
public bool Validate(Validator v, string sIdentity, OTTable table)
{
bool bRet = true;
sIdentity += "(ExtensionSubst)";
// check for data overlap
bRet &= ((val_GSUB)table).ValidateNoOverlap(m_offsetExtensionSubst, CalcLength(), v, sIdentity, table.GetTag());
// check the SubstFormat
if (SubstFormat != 1)
{
v.Error(T.T_NULL, E.GSUB_E_SubtableFormat, table.m_tag, sIdentity + ", SubstFormat = " + SubstFormat);
bRet = false;
}
// check the ExtensionLookupType
if (ExtensionLookupType >= 7)
{
v.Error(T.T_NULL, E.GSUB_E_ExtensionLookupType, table.m_tag, sIdentity + ", ExtensionLookupType = " + ExtensionLookupType);
bRet = false;
}
// check the ExtensionOffset
if (m_offsetExtensionSubst + ExtensionOffset > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E.GSUB_E_Offset_PastEOT, table.m_tag, sIdentity + ", ExtensionOffset");
bRet = false;
}
if (bRet)
{
v.Pass(T.T_NULL, P.GSUB_P_ExtensionSubst, table.m_tag, sIdentity);
}
// validate the subtable
SubTable st = null;
switch (ExtensionLookupType)
{
case 1: st = new val_GSUB.SingleSubst_val (m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
case 2: st = new val_GSUB.MultipleSubst_val (m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
case 3: st = new val_GSUB.AlternateSubst_val (m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
case 4: st = new val_GSUB.LigatureSubst_val (m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
case 5: st = new val_GSUB.ContextSubst_val (m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
case 6: st = new val_GSUB.ChainContextSubst_val(m_offsetExtensionSubst + ExtensionOffset, m_bufTable); break;
}
if (st != null)
{
I_OTLValidate iv = (I_OTLValidate)st;
iv.Validate(v, sIdentity, table);
}
return bRet;
}