private void loadFont(InputStream is) throws IOException {
if (is == null) {
throw new IOException("No input stream for font.");
}
FontInputStream fontIS = null;
try {
fontIS = new FontInputStream(is);
SortedSet<Header> records = readHeader(fontIS);
this.dataBlocks = loadTableData(records, fontIS);
this.tableBuilders = buildAllTableBuilders(this.dataBlocks);
} finally {
fontIS.close();
}
}
private Map<Header, WritableFontData> loadTableData(
SortedSet<Header> headers, FontInputStream is) throws IOException {
Map<Header, WritableFontData> tableData =
new HashMap<Header, WritableFontData>(headers.size());
logger.fine("######## Reading Table Data");
for (Header tableHeader : headers) {
is.skip(tableHeader.offset() - is.position());
logger.finer("\t" + tableHeader);
logger.finest("\t\tStream Position = " + Integer.toHexString((int) is.position()));
// don't close this or the whole stream is gone
FontInputStream tableIS = new FontInputStream(is, tableHeader.length());
// TODO(stuartg): start tracking bad tables and other errors
WritableFontData data = WritableFontData.createWritableFontData(tableHeader.length());
data.copyFrom(tableIS, tableHeader.length());
tableData.put(tableHeader, data);
}
return tableData;
}
private SortedSet<Header> readHeader(FontInputStream is) throws IOException {
SortedSet<Header> records = new TreeSet<Header>(Header.COMPARATOR_BY_OFFSET);
this.sfntVersion = is.readFixed();
this.numTables = is.readUShort();
this.searchRange = is.readUShort();
this.entrySelector = is.readUShort();
this.rangeShift = is.readUShort();
for (int tableNumber = 0; tableNumber < this.numTables; tableNumber++) {
Header table =
new Header(
is.readULongAsInt(), // safe since the tag is ASCII
is.readULong(), // checksum
is.readULongAsInt(), // offset
is.readULongAsInt()); // length
records.add(table);
}
return records;
}