public override void Read(BigEndianReader reader)
{
byte tableFlags = 0;
uint origLen = 0;
byte preprocess = 0;
string tag;
tableFlags = reader.ReadByte();
//First 7 bits for a known table
KnownTableIndex known = (KnownTableIndex)(tableFlags & 0x1F);
if (known < KnownTableIndex.UNKN)
{
tag = GetKnownTable(known);
}
else //not known so read the next tag.
{
tag = reader.ReadString(4);
}
//Get the pre-processing transformation value
//from bits 6 and 7 to versions 0-3.
preprocess = (byte)((tableFlags >> 5) & 0x3);
origLen = reader.ReadUIntBase128();
if (IsTransformedTable(tag) && preprocess == 0)
{
this.HasTransformation = true;
this.TransformedLength = reader.ReadUIntBase128();
}
this.Tag = tag;
this.Length = origLen;
}
private string GetKnownTable(KnownTableIndex known)
{
var found = "";
switch (known)
{
case KnownTableIndex.Cmap:
found = TrueTypeTableNames.CharacterMapping;
break;
case KnownTableIndex.Head:
found = TrueTypeTableNames.FontHeader;
break;
case KnownTableIndex.HHead:
found = TrueTypeTableNames.HorizontalHeader;
break;
case KnownTableIndex.HMtx:
found = TrueTypeTableNames.HorizontalMetrics;
break;
case KnownTableIndex.MaxP:
found = TrueTypeTableNames.MaximumProfile;
break;
case KnownTableIndex.Name:
found = TrueTypeTableNames.NamingTable;
break;
case KnownTableIndex.OS2:
found = TrueTypeTableNames.WindowsMetrics;
break;
case KnownTableIndex.Post:
found = TrueTypeTableNames.PostscriptInformation;
break;
case KnownTableIndex.Cvt:
found = TrueTypeTableNames.ControlValue;
break;
case KnownTableIndex.Fpgm:
found = TrueTypeTableNames.FontProgram;
break;
case KnownTableIndex.Glyf:
found = TrueTypeTableNames.GlyphData;
break;
case KnownTableIndex.Loca:
found = TrueTypeTableNames.LocationIndex;
break;
case KnownTableIndex.Prep:
found = TrueTypeTableNames.CVTProgram;
break;
case KnownTableIndex.CFF:
found = TrueTypeTableNames.PostscriptProgram;
break;
case KnownTableIndex.Vorg:
found = TrueTypeTableNames.VerticalOrigin;
break;
case KnownTableIndex.EBDT:
found = TrueTypeTableNames.EmbeddedBitmapData;
break;
case KnownTableIndex.EBLC:
found = TrueTypeTableNames.EmbeddedBitmapLocationData;
break;
case KnownTableIndex.Gasp:
found = TrueTypeTableNames.GridFittingAndScanConversion;
break;
case KnownTableIndex.HDmx:
found = TrueTypeTableNames.HorizontalDeviceMetrics;
break;
case KnownTableIndex.Kern:
found = TrueTypeTableNames.Kerning;
break;
case KnownTableIndex.LTSH:
found = TrueTypeTableNames.LinearThresholdData;
break;
case KnownTableIndex.PCLT:
found = TrueTypeTableNames.PCL5Data;
break;
case KnownTableIndex.VDmx:
found = TrueTypeTableNames.VerticalDeviceMetrics;
break;
case KnownTableIndex.VHea:
found = TrueTypeTableNames.VerticalMetricsHeader;
break;
case KnownTableIndex.VMtx:
found = TrueTypeTableNames.VerticalMetrics;
break;
case KnownTableIndex.BASE:
found = TrueTypeTableNames.BaseLineData;
break;
case KnownTableIndex.GDEF:
found = TrueTypeTableNames.GlyphDefinitionData;
break;
case KnownTableIndex.GPos:
found = TrueTypeTableNames.GlyphPositionData;
break;
case KnownTableIndex.GSub:
found = TrueTypeTableNames.GlyphSubstitutionData;
break;
case KnownTableIndex.EBSC:
found = TrueTypeTableNames.EmbeddedBitmapScanningData;
break;
case KnownTableIndex.JSTF:
found = TrueTypeTableNames.JustificationData;
break;
case KnownTableIndex.MATH:
case KnownTableIndex.CBDT:
case KnownTableIndex.CBLC:
case KnownTableIndex.COLR:
case KnownTableIndex.CPAL:
case KnownTableIndex.SVG_:
case KnownTableIndex.sbix:
case KnownTableIndex.acnt:
case KnownTableIndex.avar:
case KnownTableIndex.bdat:
case KnownTableIndex.bloc:
case KnownTableIndex.bsln:
case KnownTableIndex.cvar:
case KnownTableIndex.fdsc:
case KnownTableIndex.feat:
case KnownTableIndex.fmtx:
case KnownTableIndex.fvar:
case KnownTableIndex.gvar:
case KnownTableIndex.hsty:
case KnownTableIndex.just:
case KnownTableIndex.lcar:
case KnownTableIndex.mort:
case KnownTableIndex.morx:
case KnownTableIndex.opbd:
case KnownTableIndex.prop:
case KnownTableIndex.trak:
case KnownTableIndex.Zapf:
case KnownTableIndex.Silf:
case KnownTableIndex.Glat:
case KnownTableIndex.Gloc:
case KnownTableIndex.Feat:
case KnownTableIndex.Sill:
found = known.ToString().Replace('_', ' ');
break;
default:
throw new ArgumentOutOfRangeException(nameof(known));
}
return(found);
}
