public new MBOBuffer ReadPaddedBuffer(uint filepos, uint length)
{
// allocate a buffer to hold the table
MBOBuffer buf = new MBOBuffer(filepos, length);
// read the table
m_fs.Seek(filepos, SeekOrigin.Begin);
int nBytes = m_fs.Read(buf.GetBuffer(), 0, (int)length);
if (nBytes != length)
{
// check for premature EOF
if (m_fs.Position == m_fs.Length)
{
m_Validator.Error(E._GEN_E_EOFError, null);
}
else
{
m_Validator.Error(E._GEN_E_ReadError, null);
}
buf = null;
}
return(buf);
}
/******************
* protected methods
*/
protected static OffsetTable ReadOffsetTable(OTFileVal file, uint filepos)
{
// read the Offset Table from the file
Validator v = file.GetValidator();
const int SIZEOF_OFFSETTABLE = 12;
OffsetTable ot = null;
// read the offset table
MBOBuffer buf = file.ReadPaddedBuffer(filepos, SIZEOF_OFFSETTABLE);
if (buf != null)
{
if (OTFile.IsValidSfntVersion(buf.GetUint(0)))
{
ot = new OffsetTable(buf);
}
else
{
v.Error(T.T_NULL, E._OFFSET_E_InvalidSFNT, null, "0x" + buf.GetUint(0).ToString("x8"));
}
}
// now read the directory entries
if (ot != null)
{
const int SIZEOF_DIRECTORYENTRY = 16;
for (int i = 0; i < ot.numTables; i++)
{
uint dirFilePos = (uint)(filepos + SIZEOF_OFFSETTABLE + i * SIZEOF_DIRECTORYENTRY);
MBOBuffer DirEntBuf = file.ReadPaddedBuffer(dirFilePos, SIZEOF_DIRECTORYENTRY);
if (DirEntBuf != null)
{
DirectoryEntry de = new DirectoryEntry();
de.tag = new OTTag(DirEntBuf.GetBuffer());
de.checkSum = DirEntBuf.GetUint(4);
de.offset = DirEntBuf.GetUint(8);
de.length = DirEntBuf.GetUint(12);
ot.DirectoryEntries.Add(de);
if (de.offset > file.GetFileLength())
{
v.Error(T.T_NULL, E._DE_E_OffsetPastEOF, de.tag, "0x" + de.offset.ToString("x8"));
}
}
else
{
break;
}
}
}
return(ot);
}