public bool ReadSvgContent(ushort glyphIndex, System.Text.StringBuilder outputStBuilder)
{
if (_dicSvgEntries == null)
{
//create index
_dicSvgEntries = new Dictionary <ushort, int>();
for (int i = 0; i < _entries.Length; ++i)
{
_dicSvgEntries.Add(_entries[i].startGlyphID, i);
}
}
if (_dicSvgEntries.TryGetValue(glyphIndex, out int entryIndex))
{
SvgDocumentEntry docEntry = _entries[entryIndex];
if (docEntry.compressed)
{
throw new NotSupportedException();
//TODO: decompress this
}
outputStBuilder.Append(System.Text.Encoding.UTF8.GetString(docEntry.svgBuffer));
return(true);
}
return(false);
}
public bool ReadSvgContent(ushort glyphIndex, System.Text.StringBuilder outputStBuilder)
{
if (_dicSvgEntries == null)
{
_dicSvgEntries = new Dictionary <ushort, byte[]>();
for (int i = 0; i < _entries.Length; ++i)
{
SvgDocumentEntry en = _entries[i];
_dicSvgEntries.Add(en.startGlyphID, en.svgBuffer);
}
}
if (_dicSvgEntries.TryGetValue(glyphIndex, out byte[] svgData))
SvgDocumentEntry[] _entries; //TODO: review again
protected override void ReadContentFrom(BinaryReader reader)
{
long svgTableStartAt = reader.BaseStream.Position;
//SVG Main Header
//Type Name Description
//uint16 version Table version(starting at 0). Set to 0.
//Offset32 svgDocIndexOffset Offset(relative to the start of the SVG table) to the SVG Documents Index.Must be non - zero.
//uint32 reserved Set to 0.
//-----------
ushort version = reader.ReadUInt16();
uint offset32 = reader.ReadUInt32();
uint reserved = reader.ReadUInt32();
//-------
//-------
//SVG Document Index
//The SVG Document Index is a set of SVG documents, each of which defines one or more glyph descriptions.
//Type Name Description
//uint16 numEntries Number of SVG Document Index Entries.Must be non - zero.
//SVG Document Index Entry entries[numEntries] Array of SVG Document Index Entries.
//
long svgDocIndexStartAt = svgTableStartAt + offset32;
reader.BaseStream.Seek(svgDocIndexStartAt, SeekOrigin.Begin);
//
ushort numEntries = reader.ReadUInt16();
//
//SVG Document Index Entry
//Each SVG Document Index Entry specifies a range[startGlyphID, endGlyphID], inclusive,
//of glyph IDs and the location of its associated SVG document in the SVG table.
//Type Name Description
//uint16 startGlyphID The first glyph ID in the range described by this index entry.
//uint16 endGlyphID The last glyph ID in the range described by this index entry. Must be >= startGlyphID.
//Offset32 svgDocOffset Offset from the beginning of the SVG Document Index to an SVG document.Must be non - zero.
//uint32 svgDocLength Length of the SVG document.Must be non - zero.
//Index entries must be arranged in order of increasing startGlyphID.
//
//...this specification requires that the SVG documents be either plain-text or gzip-encoded [RFC1952].
//The encoding of the (uncompressed) SVG document must be UTF-8.
//In both cases, svgDocLength encodes the length of the encoded data, not the decoded document.
_entries = new SvgDocumentEntry[numEntries];
for (int i = 0; i < numEntries; ++i)
{
_entries[i] = new SvgDocumentEntry()
{
startGlyphID = reader.ReadUInt16(),
endGlyphID = reader.ReadUInt16(),
svgDocOffset = reader.ReadUInt32(),
svgDocLength = reader.ReadUInt32()
};
}
//TODO: review lazy load
for (int i = 0; i < numEntries; ++i)
{
//read data
SvgDocumentEntry entry = _entries[i];
if (entry.endGlyphID - entry.startGlyphID > 0)
{
throw new System.NotSupportedException();
}
reader.BaseStream.Seek(svgDocIndexStartAt + entry.svgDocOffset, SeekOrigin.Begin);
if (entry.svgDocLength == 0)
{
throw new System.NotSupportedException();
}
//
byte[] svgData = reader.ReadBytes((int)entry.svgDocLength);
_entries[i].svgBuffer = svgData;
if (svgData[0] == (byte)'<')
{
//should be plain-text
#if DEBUG
//string svgDataString = System.Text.Encoding.UTF8.GetString(svgData);
//dbugSaveAsHtml("svg" + i + ".html", svgDataString);
#endif
}
else
{
//TODO: gzip-encoded
_entries[i].compressed = true;
}
}
}
