/*****************
* public methods
*/
///
/// <summary>Calculate the check sum for the font as the
/// sum of the checksums of the offset table, directory entries, and
/// each table.
/// </summary>
public uint CalcChecksum()
{
uint sum = 0;
sum += m_OffsetTable.CalcOffsetTableChecksum();
sum += m_OffsetTable.CalcDirectoryEntriesChecksum();
if (m_OffsetTable != null)
{
for (int i = 0; i < m_OffsetTable.DirectoryEntries.Count; i++)
{
DirectoryEntry de = (DirectoryEntry)m_OffsetTable.DirectoryEntries[i];
OTTable table = GetTable(de);
uint calcChecksum = 0;
if (table != null)
{
calcChecksum = table.CalcChecksum();
}
sum += calcChecksum;
}
}
return(sum);
}
/// <summary>Add a new table to an non-file based table. Table cannot
/// already exist in the font.
/// </summary>
public void AddTable(OTTable t)
{
if (m_File != null)
{
throw new ApplicationException("attempted to add a table to a file-based OTFont object");
}
if (GetDirectoryEntry(t.m_tag) != null)
{
throw new ArgumentException("the specified table already exists in the font");
}
// build a new directory entry
DirectoryEntry de = new DirectoryEntry();
de.tag = new OTTag(t.m_tag.GetBytes());
de.checkSum = t.CalcChecksum();
de.offset = 0; // this value won't get fixed up until the font is written
de.length = t.GetLength();
// add the directory entry
m_OffsetTable.DirectoryEntries.Add(de);
m_OffsetTable.numTables++;
// add the table to the list of tables in memory
MemBasedTables.Add(t);
// special handling for certain tables
string sTable = (string)t.m_tag;
if (sTable == "CFF ")
{
m_OutlineType = OutlineType.OUTLINE_POSTSCRIPT;
}
else if (sTable == "glyf")
{
m_OutlineType = OutlineType.OUTLINE_TRUETYPE;
}
}
/// <summary>Add a new table to an non-file based table. Table cannot
/// already exist in the font.
/// </summary>
public void AddTable(OTTable t)
{
if (m_File != null)
{
throw new ApplicationException("attempted to add a table to a file-based OTFont object");
}
if (GetDirectoryEntry(t.m_tag) != null)
{
throw new ArgumentException("the specified table already exists in the font");
}
// build a new directory entry
DirectoryEntry de = new DirectoryEntry();
de.tag = new OTTag(t.m_tag.GetBytes());
de.checkSum = t.CalcChecksum();
de.offset = 0; // this value won't get fixed up until the font is written
de.length = t.GetLength();
// add the directory entry
m_OffsetTable.DirectoryEntries.Add(de);
m_OffsetTable.numTables++;
// add the table to the list of tables in memory
MemBasedTables.Add(t);
// special handling for certain tables
string sTable = (string)t.m_tag;
if (sTable == "CFF ")
{
m_OutlineType = OutlineType.OUTLINE_POSTSCRIPT;
}
else if (sTable == "glyf")
{
m_OutlineType = OutlineType.OUTLINE_TRUETYPE;
}
}
/// <summary>Write a TTC (TT Collection) to a disk file.</summary>
public static bool WriteTTCFile(FileStream fs, OTFont[] fonts)
{
bool bRet = true;
// build the TTC header
OTTag TTCtag = (OTTag)"ttcf";
uint version = 0x00020000;
uint DirectoryCount = (uint)fonts.Length;
uint [] TableDirectory = new uint[fonts.Length];
uint ulDsigTag = 0;
uint ulDsigLength = 0;
uint ulDsigOffset = 0;
uint TTCHeaderLen = 12 + DirectoryCount * 4 + 12; // length of version 2.0 header
// build an array of offset tables
OffsetTable[] otArr = new OffsetTable[fonts.Length];
for (int iFont = 0; iFont < fonts.Length; iFont++)
{
otArr[iFont] = new OffsetTable(new OTFixed(1, 0), fonts[iFont].GetNumTables());
}
// build an array of head tables that will contain the updated modified field and font checksum
Table_head[] arrHeadTables = new Table_head[fonts.Length];
for (int i = 0; i < fonts.Length; i++)
{
// get the cache
Table_head headTable = (Table_head)fonts[i].GetTable("head");
Table_head.head_cache headCache = (Table_head.head_cache)headTable.GetCache();
// set the 'modified' field to the current date
DateTime dt = DateTime.Now;
headCache.modified = headTable.DateTimeToSecondsSince1904(dt);
// generate a new table and add it to the array
Table_head newHead = (Table_head)headCache.GenerateTable();
arrHeadTables[i] = newHead;
}
// build a list of directory entries for each font
long FilePos = TTCHeaderLen;
for (int iFont = 0; iFont < fonts.Length; iFont++)
{
ushort numTables = fonts[iFont].GetNumTables();
TableDirectory[iFont] = (uint)FilePos;
FilePos += 12 + numTables * 16;
uint PrevFilePos = 0;
for (ushort i = 0; i < numTables; i++)
{
OTTable table = fonts[iFont].GetTable(i);
OTTag tag = table.m_tag;
if ((string)tag == "head")
{
table = arrHeadTables[iFont];
}
// check if this table is a duplicate of a table in a previous font
PrevFilePos = 0;
if (iFont > 0)
{
for (int iPrevFont = 0; iPrevFont < iFont; iPrevFont++)
{
for (int iTable = 0; iTable < fonts[iPrevFont].GetNumTables(); iTable++)
{
OTTable PrevTable = fonts[iPrevFont].GetTable(table.m_tag);
if (PrevTable != null)
{
if (MBOBuffer.BinaryEqual(table.m_bufTable, PrevTable.m_bufTable))
{
// get the file position for the previous table
for (int iDe = 0; iDe < otArr[iPrevFont].DirectoryEntries.Count; iDe++)
{
DirectoryEntry dePrev = (DirectoryEntry)otArr[iPrevFont].DirectoryEntries[iDe];
if (dePrev.tag == table.m_tag)
{
PrevFilePos = dePrev.offset;
break;
}
}
}
}
}
}
}
// build a new directory entry
DirectoryEntry de = new DirectoryEntry();
de.tag = new OTTag(tag.GetBytes());
de.checkSum = table.CalcChecksum();
de.length = table.GetLength();
if (PrevFilePos != 0)
{
de.offset = (uint)PrevFilePos;
}
else
{
de.offset = (uint)FilePos;
FilePos += table.GetBuffer().GetPaddedLength();
}
otArr[iFont].DirectoryEntries.Add(de);
}
// sort the directory entries
if (numTables > 1)
{
for (int i = 0; i < numTables - 1; i++)
{
for (int j = i + 1; j < numTables; j++)
{
if (((DirectoryEntry)otArr[iFont].DirectoryEntries[i]).tag > ((DirectoryEntry)otArr[iFont].DirectoryEntries[j]).tag)
{
DirectoryEntry temp = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
otArr[iFont].DirectoryEntries[i] = (DirectoryEntry)otArr[iFont].DirectoryEntries[j];
otArr[iFont].DirectoryEntries[j] = temp;
}
}
}
}
}
// update each font's checksum in the head table
for (int iFont = 0; iFont < fonts.Length; iFont++)
{
ushort numTables = fonts[iFont].GetNumTables();
// calculate the checksum
uint sum = 0;
sum += otArr[iFont].CalcOffsetTableChecksum();
sum += otArr[iFont].CalcDirectoryEntriesChecksum();
for (ushort i = 0; i < numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
OTTable table = fonts[iFont].GetTable(de.tag);
if ((string)de.tag == "head")
{
table = arrHeadTables[iFont];
}
sum += table.CalcChecksum();
}
// get the cache
Table_head headTable = arrHeadTables[iFont];
Table_head.head_cache headCache = (Table_head.head_cache)headTable.GetCache();
// set the checkSumAdujustment field
headCache.checkSumAdjustment = 0xb1b0afba - sum;
// generate a new table and replace the head table in the array of head tables
Table_head newHead = (Table_head)headCache.GenerateTable();
arrHeadTables[iFont] = newHead;
}
// write the TTC header
WriteUint32MBO(fs, (uint)TTCtag);
WriteUint32MBO(fs, version);
WriteUint32MBO(fs, DirectoryCount);
for (int i = 0; i < fonts.Length; i++)
{
WriteUint32MBO(fs, TableDirectory[i]);
}
WriteUint32MBO(fs, ulDsigTag);
WriteUint32MBO(fs, ulDsigLength);
WriteUint32MBO(fs, ulDsigOffset);
// write out each font
for (int iFont = 0; iFont < fonts.Length; iFont++)
{
ushort numTables = fonts[iFont].GetNumTables();
// write the offset table
fs.Write(otArr[iFont].m_buf.GetBuffer(), 0, (int)otArr[iFont].m_buf.GetLength());
// write the directory entries
for (int i = 0; i < numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)otArr[iFont].DirectoryEntries[i];
fs.Write(de.m_buf.GetBuffer(), 0, (int)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 (fs.Position == de.offset)
{
OTTable table = fonts[iFont].GetTable(de.tag);
if ((string)table.m_tag == "head")
{
table = arrHeadTables[iFont];
}
fs.Write(table.m_bufTable.GetBuffer(), 0, (int)table.GetBuffer().GetPaddedLength());
}
}
}
return(bRet);
}
/// <summary>Write a single OTF to a disk file, with tables in
/// proper order, checksums set, etc.
/// </summary>
public static bool WriteSfntFile(FileStream fs, OTFont font)
{
bool bRet = true;
OTFixed sfntVersion = new OTFixed(1, 0);
ushort numTables = font.GetNumTables();
OffsetTable ot = new OffsetTable(sfntVersion, numTables);
// order tables in fastfont order
string [] arrOrderedNames = null;
string [] ttNames =
{
"head", "hhea", "maxp", "OS/2", "hmtx", "LTSH", "VDMX", "hdmx", "cmap", "fpgm",
"prep", "cvt ", "loca", "glyf", "kern", "name", "post", "gasp", "PCLT"
};
string [] psNames =
{
"head", "hhea", "maxp", "OS/2", "name", "cmap", "post", "CFF "
};
if (font.ContainsTrueTypeOutlines())
{
arrOrderedNames = ttNames;
}
else if (font.ContainsPostScriptOutlines())
{
arrOrderedNames = psNames;
}
OTTable[] OrderedTables = new OTTable[numTables];
for (ushort i = 0; i < numTables; i++)
{
OrderedTables[i] = font.GetTable(i);
}
if (arrOrderedNames != null)
{
ushort curpos = 0;
for (int iName = 0; iName < arrOrderedNames.Length; iName++)
{
for (ushort i = curpos; i < numTables; i++)
{
if (arrOrderedNames[iName] == (string)OrderedTables[i].m_tag)
{
OTTable temp = OrderedTables[curpos];
OrderedTables[curpos] = OrderedTables[i];
OrderedTables[i] = temp;
curpos++;
break;
}
}
}
}
// update the modified date in the head table
for (int i = 0; i < OrderedTables.Length; i++)
{
if ((string)OrderedTables[i].m_tag == "head")
{
// get the cache
Table_head headTable = (Table_head)OrderedTables[i];
Table_head.head_cache headCache = (Table_head.head_cache)headTable.GetCache();
// set the 'modified' field to the current date and time
DateTime dt = DateTime.Now;
headCache.modified = headTable.DateTimeToSecondsSince1904(dt);
// generate a new table and replace the head table in the list of ordered tables
Table_head newHead = (Table_head)headCache.GenerateTable();
OrderedTables[i] = newHead;
break;
}
}
// build a list of directory entries
long TableFilePos = 12 + numTables * 16;
for (ushort i = 0; i < numTables; i++)
{
OTTable table = OrderedTables[i];
OTTag tag = table.m_tag;
// build a new directory entry
DirectoryEntry de = new DirectoryEntry();
de.tag = new OTTag(tag.GetBytes());
de.checkSum = table.CalcChecksum();
de.offset = (uint)TableFilePos;
de.length = table.GetLength();
ot.DirectoryEntries.Add(de);
TableFilePos += table.GetBuffer().GetPaddedLength();
}
// sort the directory entries
if (numTables > 1)
{
for (int i = 0; i < numTables - 1; i++)
{
for (int j = i + 1; j < numTables; j++)
{
if (((DirectoryEntry)(ot.DirectoryEntries[i])).tag > ((DirectoryEntry)(ot.DirectoryEntries[j])).tag)
{
DirectoryEntry temp = (DirectoryEntry)ot.DirectoryEntries[i];
ot.DirectoryEntries[i] = (DirectoryEntry)ot.DirectoryEntries[j];
ot.DirectoryEntries[j] = temp;
}
}
}
}
// update the font checksum in the head table
for (int i = 0; i < OrderedTables.Length; i++)
{
if ((string)OrderedTables[i].m_tag == "head")
{
// calculate the checksum
uint sum = 0;
sum += ot.CalcOffsetTableChecksum();
sum += ot.CalcDirectoryEntriesChecksum();
for (int j = 0; j < OrderedTables.Length; j++)
{
sum += OrderedTables[j].CalcChecksum();
}
// get the cache
Table_head headTable = (Table_head)OrderedTables[i];
Table_head.head_cache headCache = (Table_head.head_cache)headTable.GetCache();
// set the checkSumAdujustment field
headCache.checkSumAdjustment = 0xb1b0afba - sum;
// generate a new table and replace the head table in the list of ordered tables
Table_head newHead = (Table_head)headCache.GenerateTable();
OrderedTables[i] = newHead;
break;
}
}
// write the offset table
fs.Write(ot.m_buf.GetBuffer(), 0, (int)ot.m_buf.GetLength());
// write the directory entries
for (int i = 0; i < numTables; i++)
{
DirectoryEntry de = (DirectoryEntry)ot.DirectoryEntries[i];
fs.Write(de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength());
}
// write the tables
for (ushort i = 0; i < numTables; i++)
{
OTTable table = OrderedTables[i];
fs.Write(table.m_bufTable.GetBuffer(), 0, (int)table.GetBuffer().GetPaddedLength());
}
return(bRet);
}
/*****************
* protected methods
*/
/*****************
* public methods
*/
//meant to avoid code repetition (is called from OTFontVal too)
public bool ValidateTable(OTTable table, Validator v, DirectoryEntry de, OTFontVal fontOwner)
{
String tname = GetTableManager().GetUnaliasedTableName(de.tag);
bool bRet = true;
// verify the checksum value from the directory entry matches the checksum for the table
if (!(tname == "DSIG" && IsCollection()))
{
uint calcChecksum = 0;
if (table != null)
{
calcChecksum = table.CalcChecksum();
}
if (de.checkSum != calcChecksum)
{
string s = "table '" + de.tag + "', calc: 0x" + calcChecksum.ToString("x8") + ", font: 0x" + de.checkSum.ToString("x8");
v.Error(T.T_NULL, E._DE_E_ChecksumError, de.tag, s);
bRet = false;
}
}
// verify that table has pad bytes set to zero
if (table != null)
{
uint nBytes = GetNumPadBytesAfterTable(table);
bool bPadBytesZero = true;
if (nBytes != 0)
{
long PadFilePos = table.GetBuffer().GetFilePos() + table.GetBuffer().GetLength();
byte[] padbuf = ReadBytes(PadFilePos, nBytes);
for (int iByte = 0; iByte < padbuf.Length; iByte++)
{
if (padbuf[iByte] != 0)
{
bPadBytesZero = false;
break;
}
}
}
if (bPadBytesZero == false)
{
v.Warning(T.T_NULL, W._DE_W_PadBytesNotZero, de.tag, "after " + de.tag + " table");
}
}
// ask the table object to validate its data
if (!(tname == "DSIG" && IsCollection())) v.OnTableValidationEvent(de, true);
if (table != null)
{
if (v.TestTable(de.tag)) // don't test deselected tables
{
try
{
ITableValidate valtable = (ITableValidate)table;
bRet &= valtable.Validate(v, fontOwner);
}
catch (InvalidCastException e)
{
v.ApplicationError(T.T_NULL, E._Table_E_Exception, table.m_tag, e.ToString());
bRet = false;
}
}
else
{
v.Info(I._Table_I_NotSelected, de.tag);
}
}
else
{
if (de.length == 0)
{
// check if it's a known OT table type since zero length private tables seem allowable
if (TableManager.IsKnownOTTableType(de.tag))
{
v.Error(T.T_NULL, E._Table_E_Invalid, de.tag, "The directory entry length is zero");
bRet = false;
}
}
else if (de.offset == 0)
{
v.Error(T.T_NULL, E._Table_E_Invalid, de.tag, "The directory entry offset is zero");
bRet = false;
}
else if (de.offset > GetFileLength())
{
v.Error(T.T_NULL, E._Table_E_Invalid, de.tag, "The table offset points past end of file");
bRet = false;
}
else if (de.offset + de.length > GetFileLength())
{
v.Error(T.T_NULL, E._Table_E_Invalid, de.tag, "The table extends past end of file");
bRet = false;
}
else
{
v.Error(E._Table_E_Invalid, de.tag);
bRet = false;
}
}
if (!(tname == "DSIG" && IsCollection())) v.OnTableValidationEvent(de, false);
return bRet;
}
