static JstfScriptTable ReadJstfScriptTable(BinaryReader reader)
{
//A Justification Script(JstfScript) table describes the justification information for a single script.
//It consists of an offset to a table that defines extender glyphs(extenderGlyphOffset),
//an offset to a default justification table for the script (defJstfLangSysOffset),
//and a count of the language systems that define justification data(jstfLangSysCount).
//If a script uses the same justification information for all language systems,
//the font developer defines only the default JstfLangSys table and
//sets the jstfLangSysCount value to zero(0).
//However, if any language system has unique justification suggestions,
//jstfLangSysCount will be a positive value,
//and the JstfScript table must include an array of records(jstfLangSysRecords),
//one for each language system.Each JstfLangSysRecord contains a language system tag(jstfLangSysTag) and
//an offset to a justification language system table(jstfLangSysOffset).
//In the jstfLangSysRecords array, records are ordered alphabetically by jstfLangSysTag.
//JstfScript table
//Type Name Description
//Offset16 extenderGlyphOffset Offset to ExtenderGlyph table, from beginning of JstfScript table(may be NULL)
//Offset16 defJstfLangSysOffset Offset to default JstfLangSys table, from beginning of JstfScript table(may be NULL)
//uint16 jstfLangSysCount Number of JstfLangSysRecords in this table - may be zero(0)
//JstfLangSysRecord jstfLangSysRecords[jstfLangSysCount] Array of JstfLangSysRecords, in alphabetical order by JstfLangSysTag
JstfScriptTable jstfScriptTable = new JstfScriptTable();
long tableStartAt = reader.BaseStream.Position;
ushort extenderGlyphOffset = reader.ReadUInt16();
ushort defJstfLangSysOffset = reader.ReadUInt16();
ushort jstfLangSysCount = reader.ReadUInt16();
if (jstfLangSysCount > 0)
{
JstfLangSysRecord[] recs = new JstfLangSysRecord[jstfLangSysCount];
for (int i = 0; i < jstfLangSysCount; ++i)
{
recs[i] = ReadJstfLangSysRecord(reader);
}
jstfScriptTable.other = recs;
}
if (extenderGlyphOffset > 0)
{
reader.BaseStream.Position = tableStartAt + extenderGlyphOffset;
jstfScriptTable.extenderGlyphs = ReadExtenderGlyphTable(reader);
}
if (defJstfLangSysOffset > 0)
{
reader.BaseStream.Position = tableStartAt + defJstfLangSysOffset;
jstfScriptTable.defaultLangSys = ReadJstfLangSysRecord(reader);
}
return(jstfScriptTable);
}
public JstfLangSysRecord GetJstfLangSysRecord(uint i)
{
JstfLangSysRecord jlsr = null;
if (i < JstfLangSysCount)
{
uint offset = m_offsetJstfScript + (uint)FieldOffsets.JstfLangSysRecords + i * 6;
jlsr = new JstfLangSysRecord((ushort)offset, m_bufTable);
}
return(jlsr);
}
public JstfLangSys_val GetJstfLangSysTable_val(JstfLangSysRecord jlsr)
{
uint offset = m_offsetJstfScript + (uint)jlsr.JstfLangSysOffset;
return(new JstfLangSys_val((ushort)offset, m_bufTable));
}
public bool Validate(Validator v, string sIdentity, OTTable table)
{
bool bRet = true;
// check for data overlap
bRet &= ((val_JSTF)table).ValidateNoOverlap(m_offsetJstfScript, CalcLength(), v, sIdentity, table.GetTag());
// check the ExtenderGlyph offset
if (ExtenderGlyphOffset != 0)
{
if (m_offsetJstfScript + ExtenderGlyphOffset > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E.JSTF_E_Offset_PastEOT, table.m_tag, sIdentity + ", ExtenderGlyph");
bRet = false;
}
}
// check the ExtenderGlyph table
if (ExtenderGlyphOffset != 0)
{
ExtenderGlyph_val eg = GetExtenderGlyphTable_val();
bRet &= eg.Validate(v, sIdentity + ", ExtenderGlyph", table);
}
// check the DefJstfLangSys offset
if (DefJstfLangSysOffset != 0)
{
if (m_offsetJstfScript + DefJstfLangSysOffset > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E.JSTF_E_Offset_PastEOT, table.m_tag, sIdentity + ", DefJstfLangSys");
bRet = false;
}
}
// check the DefJstfLangSys table
if (DefJstfLangSysOffset != 0)
{
JstfLangSys_val jls = GetDefJstfLangSysTable_val();
bRet &= jls.Validate(v, sIdentity + ", DefJstfLangSys", table);
}
// check the JstfLangSysRecord array length
if (m_offsetJstfScript + (uint)FieldOffsets.JstfLangSysRecords + JstfLangSysCount * 6 > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E.JSTF_E_Array_pastEOT, table.m_tag, sIdentity + ", JstfLangSysRecord array");
bRet = false;
}
// check the JstfLangSysRecord array order
if (JstfLangSysCount > 1)
{
for (uint i = 0; i < JstfLangSysCount - 1; i++)
{
JstfLangSysRecord jlsrCurr = GetJstfLangSysRecord(i);
JstfLangSysRecord jlsrNext = GetJstfLangSysRecord(i);
if (jlsrCurr.JstfLangSysTag >= jlsrNext.JstfLangSysTag)
{
v.Error(T.T_NULL, E.JSTF_E_Array_order, table.m_tag, sIdentity + ", JstfLangSysRecord[" + i + "]");
bRet = false;
break;
}
}
}
// check each JstfLangSysRecord
for (uint i = 0; i < JstfLangSysCount; i++)
{
JstfLangSysRecord jlsr = GetJstfLangSysRecord(i);
// check the tag
if (!jlsr.JstfLangSysTag.IsValid())
{
v.Error(T.T_NULL, E.JSTF_E_tag, table.m_tag, sIdentity + ", JstfLangSysRecord[" + i + "]");
bRet = false;
}
// check the JstfLangSys offset
if (m_offsetJstfScript + jlsr.JstfLangSysOffset > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E.JSTF_E_Offset_PastEOT, table.m_tag, sIdentity + ", JstfLangSysRecord[" + i + "]");
bRet = false;
}
// check the JstfLangSys table
JstfLangSys_val jls = GetJstfLangSysTable_val(jlsr);
bRet &= jls.Validate(v, sIdentity + ", JstfLangSysRecord[" + i + "], JstfLangSys", table);
}
return(bRet);
}
public JstfLangSys_val GetJstfLangSysTable_val(JstfLangSysRecord jlsr)
{
uint offset = m_offsetJstfScript + (uint)jlsr.JstfLangSysOffset;
return new JstfLangSys_val((ushort)offset, m_bufTable);
}
public JstfLangSysRecord GetJstfLangSysRecord(uint i)
{
JstfLangSysRecord jlsr = null;
if (i < JstfLangSysCount)
{
uint offset = m_offsetJstfScript + (uint)FieldOffsets.JstfLangSysRecords + i*6;
jlsr = new JstfLangSysRecord((ushort)offset, m_bufTable);
}
return jlsr;
}
