static byte[] get_TTC_digest( OTFile f )
{
TTCHeader ttc = f.GetTTCHeader();
uint back_shift = 12;
//if ( ttc.version == 0x00020000 )
back_shift = 0;
TTCHBuffer ttcb = new TTCHBuffer ( 12 + ttc.DirectoryCount * 4 + 12 - back_shift );
// write the TTC header
ttcb.FillUint32MBO((uint) ttc.TTCTag);
ttcb.FillUint32MBO(ttc.version);
ttcb.FillUint32MBO(ttc.DirectoryCount);
for (int i=0; i< f.GetNumFonts() ; i++)
{
ttcb.FillUint32MBO( (uint) ttc.DirectoryOffsets[i] - back_shift);
}
//if ( ttc.version == 0x00020000 )
{
ttcb.FillUint32MBO( 0 );
ttcb.FillUint32MBO( 0 );
ttcb.FillUint32MBO( 0 );
}
hash.TransformBlock ( ttcb.buffer, 0, ttcb.buffer.Length, ttcb.buffer, 0 );
// build an array of offset tables
OffsetTable[] otArr = new OffsetTable[f.GetNumFonts()];
for (uint iFont=0; iFont<f.GetNumFonts(); iFont++)
{
otArr[iFont] = new OffsetTable(new OTFixed(1,0), f.GetFont(iFont).GetNumTables());
for (ushort i=0; i<f.GetFont(iFont).GetNumTables(); i++) {
DirectoryEntry old = f.GetFont(iFont).GetDirectoryEntry(i);
DirectoryEntry de = new DirectoryEntry(old);
de.offset -= back_shift;
otArr[iFont].DirectoryEntries.Add(de);
}
}
if ( (uint) ttc.DirectoryOffsets[(int)f.GetNumFonts()-1] < f.GetFont(0).GetDirectoryEntry(0).offset )
{
// assume directory-contiguous
for (uint iFont=0; iFont<f.GetNumFonts(); iFont++)
{
// write the offset table
hash.TransformBlock (otArr[iFont].m_buf.GetBuffer(), 0, (int)otArr[iFont].m_buf.GetLength(),
otArr[iFont].m_buf.GetBuffer(), 0);
// write the directory entries
for (int i=0; i<f.GetFont(iFont).GetNumTables(); i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
hash.TransformBlock (de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength(),
de.m_buf.GetBuffer(), 0 );
}
}
}
// write out each font
uint PrevPos = 0;
for (uint iFont=0; iFont<f.GetNumFonts(); iFont++)
{
ushort numTables = f.GetFont(iFont).GetNumTables();
if ( (uint) ttc.DirectoryOffsets[(int)f.GetNumFonts()-1] > f.GetFont(0).GetDirectoryEntry(0).offset )
{
// assume font-contiguous
// write the offset table
hash.TransformBlock (otArr[iFont].m_buf.GetBuffer(), 0, (int)otArr[iFont].m_buf.GetLength(),
otArr[iFont].m_buf.GetBuffer(), 0 );
// write the directory entries
for (int i=0; i<numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
hash.TransformBlock (de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength(),
de.m_buf.GetBuffer(), 0 );
}
}
// write out each table unless a shared version has been written
for (ushort i=0; i<numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
if (PrevPos < de.offset) //crude
{
OTTable table = f.GetFont(iFont).GetTable(de.tag);
hash.TransformBlock (table.m_bufTable.GetBuffer(), 0, (int)table.GetBuffer().GetPaddedLength(),
table.m_bufTable.GetBuffer(), 0 );
PrevPos = de.offset;
}
}
}
byte[] usFlag = {0, 1};
hash.TransformFinalBlock(usFlag, 0,2);
return hash.Hash;
}
static byte[] get_TTC_digest(OTFile f)
{
TTCHeader ttc = f.GetTTCHeader();
uint back_shift = 12;
//if ( ttc.version == 0x00020000 )
back_shift = 0;
TTCHBuffer ttcb = new TTCHBuffer(12 + ttc.DirectoryCount * 4 + 12 - back_shift);
// write the TTC header
ttcb.FillUint32MBO((uint)ttc.TTCTag);
ttcb.FillUint32MBO(ttc.version);
ttcb.FillUint32MBO(ttc.DirectoryCount);
for (int i = 0; i < f.GetNumFonts(); i++)
{
ttcb.FillUint32MBO((uint)ttc.DirectoryOffsets[i] - back_shift);
}
//if ( ttc.version == 0x00020000 )
{
ttcb.FillUint32MBO(0);
ttcb.FillUint32MBO(0);
ttcb.FillUint32MBO(0);
}
uint Position = (uint)ttcb.buffer.Length;
hash.TransformBlock(ttcb.buffer, 0, ttcb.buffer.Length, ttcb.buffer, 0);
// build an array of offset tables
OffsetTable[] otArr = new OffsetTable[f.GetNumFonts()];
for (uint iFont = 0; iFont < f.GetNumFonts(); iFont++)
{
otArr[iFont] = new OffsetTable(new OTFixed(1, 0), f.GetFont(iFont).GetNumTables());
for (ushort i = 0; i < f.GetFont(iFont).GetNumTables(); i++)
{
DirectoryEntry old = f.GetFont(iFont).GetDirectoryEntry(i);
DirectoryEntry de = new DirectoryEntry(old);
de.offset -= back_shift;
otArr[iFont].DirectoryEntries.Add(de);
}
}
if ((uint)ttc.DirectoryOffsets[(int)f.GetNumFonts() - 1] < f.GetFont(0).GetDirectoryEntry(0).offset)
{
// assume directory-contiguous
for (uint iFont = 0; iFont < f.GetNumFonts(); iFont++)
{
// write the offset table
hash.TransformBlock(otArr[iFont].m_buf.GetBuffer(), 0, (int)otArr[iFont].m_buf.GetLength(),
otArr[iFont].m_buf.GetBuffer(), 0);
Position += otArr[iFont].m_buf.GetLength();
// write the directory entries
for (int i = 0; i < f.GetFont(iFont).GetNumTables(); i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
hash.TransformBlock(de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength(),
de.m_buf.GetBuffer(), 0);
Position += de.m_buf.GetLength();
}
}
}
// write out each font
uint max_offset = 0;
uint max_padded_length = 0;
uint PrevPos = 0;
for (uint iFont = 0; iFont < f.GetNumFonts(); iFont++)
{
ushort numTables = f.GetFont(iFont).GetNumTables();
if ((uint)ttc.DirectoryOffsets[(int)f.GetNumFonts() - 1] > f.GetFont(0).GetDirectoryEntry(0).offset)
{
// assume font-contiguous
// write the offset table
hash.TransformBlock(otArr[iFont].m_buf.GetBuffer(), 0, (int)otArr[iFont].m_buf.GetLength(),
otArr[iFont].m_buf.GetBuffer(), 0);
Position += otArr[iFont].m_buf.GetLength();
// write the directory entries
for (int i = 0; i < numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
hash.TransformBlock(de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength(),
de.m_buf.GetBuffer(), 0);
Position += de.m_buf.GetLength();
}
}
// write out each table unless a shared version has been written
for (ushort i = 0; i < numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
if (de.offset > max_offset)
{
max_offset = de.offset;
max_padded_length = f.GetFont(iFont).GetTable(de.tag).GetBuffer().GetPaddedLength();
}
if (PrevPos < de.offset) //crude
{
OTTable table = f.GetFont(iFont).GetTable(de.tag);
hash.TransformBlock(table.m_bufTable.GetBuffer(), 0, (int)table.GetBuffer().GetPaddedLength(),
table.m_bufTable.GetBuffer(), 0);
Position += table.GetBuffer().GetPaddedLength();
PrevPos = de.offset;
}
}
}
if (max_offset + max_padded_length - Position != 0)
{
throw new NotImplementedException("Unusual TTC Directory Layout");
}
byte[] usFlag = { 0, 1 };
hash.TransformFinalBlock(usFlag, 0, 2);
return(hash.Hash);
}
