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;
// check the LookupType
if (((string)table.m_tag == "GPOS") && LookupType > 9 ||
((string)table.m_tag == "GSUB" && LookupType > 8))
{
v.Error(T.T_NULL, E._OTL_LookupTable_E_LookupType, table.m_tag, sIdentity + ", LookupType = " + LookupType);
bRet = false;
}
// check LookupFlag reserved bits are clear
if ((LookupFlag & 0x00f0) != 0)
{
v.Error(T.T_NULL, E._OTL_LookupTable_E_LookupFlag_reserved, table.m_tag, sIdentity);
bRet = false;
}
// check Subtable offset array doesn't extend past end of table
if (m_offsetLookupTable + (uint)FieldOffsets.SubTableOffsetArray + SubTableCount * 2 > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E._OTL_LookupTable_E_SubtableArray_pastEOT, table.m_tag, sIdentity);
bRet = false;
}
// check Subtable offsets don't point past end of table
for (uint i = 0; i < SubTableCount; i++)
{
// verify that the subtable offset is accessible, if not error was already reported
if (m_offsetLookupTable + (uint)FieldOffsets.SubTableOffsetArray + i * 2 + 2 <= m_bufTable.GetLength())
{
if (m_offsetLookupTable + GetSubTableOffset(i) > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E._OTL_LookupTable_E_SubtableArray_offset, table.m_tag, sIdentity + ", SubTable[" + i + "]");
bRet = false;
}
}
}
// way too many lookup tables to justify this pass message
//if (bRet)
//{
// v.Pass("_OTL_LookupTable_P_valid", table.m_tag, sIdentity);
//}
// validate each subtable
for (uint i = 0; i < SubTableCount; i++)
{
// verify that the subtable offset is accessible, if not error was already reported
if (m_offsetLookupTable + (uint)FieldOffsets.SubTableOffsetArray + i * 2 + 2 <= m_bufTable.GetLength())
{
// verify subtable offset is valid
if (m_offsetLookupTable + GetSubTableOffset(i) <= m_bufTable.GetLength())
{
SubTable st = GetSubTable(i);
if (st != null)
{
I_OTLValidate iv = (I_OTLValidate)st;
bRet &= iv.Validate(v, sIdentity + ", SubTable[" + i + "]", table);
}
else
{
v.Warning(T.T_NULL, W._TEST_W_OtherErrorsInTable, table.m_tag, "unable to validate subtable: " + sIdentity + ", SubTable[" + i + "]");
}
}
else
{
v.Warning(T.T_NULL, W._TEST_W_OtherErrorsInTable, table.m_tag, "unable to validate subtable: " + sIdentity + ", SubTable[" + i + "]");
}
}
}
return(bRet);
}
