private void Initialize()
{
// TTC header
string tag = stream.ReadTag();
if (!tag.Equals("ttcf", StringComparison.Ordinal))
{
throw new IOException("Missing TTC header");
}
float version = stream.Read32Fixed();
numFonts = (int)stream.ReadUnsignedInt();
fontOffsets = new long[numFonts];
for (int i = 0; i < numFonts; i++)
{
fontOffsets[i] = stream.ReadUnsignedInt();
}
if (version >= 2)
{
// not used at this time
int ulDsigTag = stream.ReadUnsignedShort();
int ulDsigLength = stream.ReadUnsignedShort();
int ulDsigOffset = stream.ReadUnsignedShort();
}
}
/**
* This will read the required data from the stream.
*
* @param ttf The font that is being read.
* @param data The stream to read the data from.
* @ If there is an error reading the data.
*/
public override void Read(TrueTypeFont ttf, TTFDataStream data)
{
version = data.Read32Fixed();
fontRevision = data.Read32Fixed();
checkSumAdjustment = data.ReadUnsignedInt();
magicNumber = data.ReadUnsignedInt();
flags = data.ReadUnsignedShort();
unitsPerEm = data.ReadUnsignedShort();
created = data.ReadInternationalDate();
modified = data.ReadInternationalDate();
xMin = data.ReadSignedShort();
yMin = data.ReadSignedShort();
xMax = data.ReadSignedShort();
yMax = data.ReadSignedShort();
macStyle = data.ReadUnsignedShort();
lowestRecPPEM = data.ReadUnsignedShort();
fontDirectionHint = data.ReadSignedShort();
indexToLocFormat = data.ReadSignedShort();
glyphDataFormat = data.ReadSignedShort();
initialized = true;
}
/**
* This will read the required data from the stream.
*
* @param ttf The font that is being read.
* @param data The stream to read the data from.
* @ If there is an error reading the data.
*/
public override void Read(TrueTypeFont ttf, TTFDataStream data)
{
version = data.Read32Fixed();
defaultVertOriginY = data.ReadSignedShort();
int numVertOriginYMetrics = data.ReadUnsignedShort();
origins = new Dictionary <int, int>(numVertOriginYMetrics);
for (int i = 0; i < numVertOriginYMetrics; ++i)
{
int g = data.ReadUnsignedShort();
int y = data.ReadSignedShort();
origins[g] = y;
}
initialized = true;
}
/**
* Parse a file and get a true type font.
*
* @param raf The TTF file.
* @return A TrueType font.
* @ If there is an error parsing the TrueType font.
*/
public TrueTypeFont Parse(TTFDataStream raf, string fontName = null)
{
if (string.Equals(raf.ReadString(4), TrueTypeCollection.TAG, StringComparison.Ordinal))
{
raf.Seek(raf.CurrentPosition - 4);
TrueTypeCollection fontCollection = new TrueTypeCollection(raf);
var nameFont = fontCollection.GetFontByName(fontName);
if (nameFont == null)
{
nameFont = fontCollection.GetFontAtIndex(0);
}
return(nameFont);
}
raf.Seek(raf.CurrentPosition - 4);
TrueTypeFont font = NewFont(raf);
font.Version = raf.Read32Fixed();
int numberOfTables = raf.ReadUnsignedShort();
int searchRange = raf.ReadUnsignedShort();
int entrySelector = raf.ReadUnsignedShort();
int rangeShift = raf.ReadUnsignedShort();
for (int i = 0; i < numberOfTables; i++)
{
TTFTable table = ReadTableDirectory(font, raf);
// skip tables with zero length
if (table != null)
{
font.AddTable(table);
}
}
// parse tables if wanted
if (!parseOnDemandOnly)
{
ParseTables(font);
}
return(font);
}
/**
* This will read the required data from the stream.
*
* @param ttf The font that is being read.
* @param data The stream to read the data from.
* @ If there is an error reading the data.
*/
public override void Read(TrueTypeFont ttf, TTFDataStream data)
{
version = data.Read32Fixed();
ascender = data.ReadSignedShort();
descender = data.ReadSignedShort();
lineGap = data.ReadSignedShort();
advanceHeightMax = data.ReadUnsignedShort();
minTopSideBearing = data.ReadSignedShort();
minBottomSideBearing = data.ReadSignedShort();
yMaxExtent = data.ReadSignedShort();
caretSlopeRise = data.ReadSignedShort();
caretSlopeRun = data.ReadSignedShort();
caretOffset = data.ReadSignedShort();
reserved1 = data.ReadSignedShort();
reserved2 = data.ReadSignedShort();
reserved3 = data.ReadSignedShort();
reserved4 = data.ReadSignedShort();
metricDataFormat = data.ReadSignedShort();
numberOfVMetrics = data.ReadUnsignedShort();
initialized = true;
}
/**
* This will read the required data from the stream.
*
* @param ttf The font that is being read.
* @param data The stream to read the data from.
* @ If there is an error reading the data.
*/
public override void Read(TrueTypeFont ttf, TTFDataStream data)
{
formatType = data.Read32Fixed();
italicAngle = data.Read32Fixed();
underlinePosition = data.ReadSignedShort();
underlineThickness = data.ReadSignedShort();
isFixedPitch = data.ReadUnsignedInt();
minMemType42 = data.ReadUnsignedInt();
maxMemType42 = data.ReadUnsignedInt();
mimMemType1 = data.ReadUnsignedInt();
maxMemType1 = data.ReadUnsignedInt();
if (formatType.CompareTo(1.0f) == 0)
{
/*
* This TrueType font file contains exactly the 258 glyphs in the standard Macintosh TrueType.
*/
glyphNames = new string[WGL4Names.NUMBER_OF_MAC_GLYPHS];
Array.Copy(WGL4Names.MAC_GLYPH_NAMES, 0, glyphNames, 0, WGL4Names.NUMBER_OF_MAC_GLYPHS);
}
else if (formatType.CompareTo(2.0f) == 0)
{
int numGlyphs = data.ReadUnsignedShort();
int[] glyphNameIndex = new int[numGlyphs];
glyphNames = new string[numGlyphs];
int maxIndex = int.MinValue;
for (int i = 0; i < numGlyphs; i++)
{
int index = data.ReadUnsignedShort();
glyphNameIndex[i] = index;
// PDFBOX-808: Index numbers between 32768 and 65535 are
// reserved for future use, so we should just ignore them
if (index <= 32767)
{
maxIndex = Math.Max(maxIndex, index);
}
}
string[] nameArray = null;
if (maxIndex >= WGL4Names.NUMBER_OF_MAC_GLYPHS)
{
nameArray = new string[maxIndex - WGL4Names.NUMBER_OF_MAC_GLYPHS + 1];
for (int i = 0; i < maxIndex - WGL4Names.NUMBER_OF_MAC_GLYPHS + 1; i++)
{
int numberOfChars = data.ReadUnsignedByte();
nameArray[i] = data.ReadString(numberOfChars);
}
}
for (int i = 0; i < numGlyphs; i++)
{
int index = glyphNameIndex[i];
if (index >= 0 && index < WGL4Names.NUMBER_OF_MAC_GLYPHS)
{
glyphNames[i] = WGL4Names.MAC_GLYPH_NAMES[index];
}
else if (index >= WGL4Names.NUMBER_OF_MAC_GLYPHS && index <= 32767 && nameArray != null)
{
glyphNames[i] = nameArray[index - WGL4Names.NUMBER_OF_MAC_GLYPHS];
}
else
{
// PDFBOX-808: Index numbers between 32768 and 65535 are
// reserved for future use, so we should just ignore them
glyphNames[i] = ".undefined";
}
}
}
else if (formatType.CompareTo(2.5f) == 0)
{
int[] glyphNameIndex = new int[ttf.NumberOfGlyphs];
for (int i = 0; i < glyphNameIndex.Length; i++)
{
int offset = data.ReadSignedByte();
glyphNameIndex[i] = i + 1 + offset;
}
glyphNames = new string[glyphNameIndex.Length];
for (int i = 0; i < glyphNames.Length; i++)
{
int index = glyphNameIndex[i];
if (index >= 0 && index < WGL4Names.NUMBER_OF_MAC_GLYPHS)
{
string name = WGL4Names.MAC_GLYPH_NAMES[index];
if (name != null)
{
glyphNames[i] = name;
}
}
else
{
Debug.WriteLine($"debug: incorrect glyph name index {index}, valid numbers 0..{WGL4Names.NUMBER_OF_MAC_GLYPHS}");
}
}
}
else if (formatType.CompareTo(3.0f) == 0)
{
// no postscript information is provided.
Debug.WriteLine($"debug: No PostScript name information is provided for the font {font.Name}");
}
initialized = true;
}