private int readInt(RandomAccessFileOrArray stream) throws IOException {
if (isBigEndian) {
return stream.readInt();
} else {
return stream.readIntLE();
}
}
/**
* Reads the kerning information from the 'kern' table.
*
* @throws IOException the font file could not be read
*/
void readKerning() throws IOException {
int table_location[];
table_location = (int[]) positionTables.get("kern");
if (table_location == null) return;
rf.seek(table_location[0] + 2);
int nTables = rf.readUnsignedShort();
int checkpoint = table_location[0] + 4;
int length = 0;
for (int k = 0; k < nTables; ++k) {
checkpoint += length;
rf.seek(checkpoint);
rf.skipBytes(2);
length = rf.readUnsignedShort();
int coverage = rf.readUnsignedShort();
if ((coverage & 0xfff7) == 0x0001) {
int nPairs = rf.readUnsignedShort();
rf.skipBytes(6);
for (int j = 0; j < nPairs; ++j) {
int pair = rf.readInt();
int value = ((int) rf.readShort() * 1000) / head.unitsPerEm;
kerning.put(pair, value);
}
}
}
}
/**
* Reads the several maps from the table 'cmap'. The maps of interest are 1.0 for symbolic fonts
* and 3.1 for all others. A symbolic font is defined as having the map 3.0.
*
* @throws DocumentException the font is invalid
* @throws IOException the font file could not be read
*/
public void readCMaps() throws DocumentException, IOException {
int table_location[];
table_location = (int[]) positionTables.get("cmap");
if (table_location == null)
throw new DocumentException("Table 'cmap' does not exist in " + fileName + style);
rf.seek(table_location[0]);
rf.skipBytes(2);
int num_tables = rf.readUnsignedShort();
fontSpecific = false;
int map10 = 0;
int map31 = 0;
int map30 = 0;
for (int k = 0; k < num_tables; ++k) {
int platId = rf.readUnsignedShort();
int platSpecId = rf.readUnsignedShort();
int offset = rf.readInt();
if (platId == 3 && platSpecId == 0) {
fontSpecific = true;
map30 = offset;
} else if (platId == 3 && platSpecId == 1) {
map31 = offset;
}
if (platId == 1 && platSpecId == 0) {
map10 = offset;
}
}
if (map10 > 0) {
rf.seek(table_location[0] + map10);
int format = rf.readUnsignedShort();
switch (format) {
case 0:
cmap10 = readFormat0();
break;
case 4:
cmap10 = readFormat4();
break;
case 6:
cmap10 = readFormat6();
break;
}
}
if (map31 > 0) {
rf.seek(table_location[0] + map31);
int format = rf.readUnsignedShort();
if (format == 4) {
cmap31 = readFormat4();
}
}
if (map30 > 0) {
rf.seek(table_location[0] + map30);
int format = rf.readUnsignedShort();
if (format == 4) {
cmap10 = readFormat4();
}
}
}
private void processPost() throws DocumentException, IOException {
int[] tableLocation = getTableLocation("post");
if (tableLocation == null) {
italicAngle = -Math.atan2(hhea.caretSlopeRun, hhea.caretSlopeRise) * 180 / Math.PI;
return;
}
rf.seek(tableLocation[0] + 4);
short mantissa = rf.readShort();
int fraction = rf.readUnsignedShort();
italicAngle = (double) mantissa + (double) fraction / 16384.0;
underlinePosition = (double) rf.readShort() / head.unitsPerEm;
underlineThickness = (double) rf.readShort() / head.unitsPerEm;
isFixedPitch = rf.readInt() != 0;
}
private int[] getGlyphDataPosition(int glyphIndex) throws IOException {
int[] glyphDataPosition = new int[2];
int[] tableLocation = (int[]) positionTables.get("loca");
int offset = tableLocation[0] + head.locaBytesPerEntry * glyphIndex;
rf.seek(offset);
if (head.locaBytesPerEntry == 4) {
glyphDataPosition[0] = rf.readInt();
glyphDataPosition[1] = rf.readInt() - glyphDataPosition[0];
} else {
glyphDataPosition[0] = rf.readUnsignedShort() * 2;
glyphDataPosition[1] = rf.readUnsignedShort() * 2 - glyphDataPosition[0];
}
return glyphDataPosition;
}
private void fillOS() throws DocumentException, IOException {
int[] tableLocation = getTableLocation("OS/2");
rf.seek(tableLocation[0]);
int version = rf.readUnsignedShort();
os_2.xAvgCharWidth = rf.readShort();
os_2.usWeightClass = rf.readUnsignedShort();
os_2.usWidthClass = rf.readUnsignedShort();
os_2.fsType = rf.readShort();
os_2.ySubscriptXSize = rf.readShort();
os_2.ySubscriptYSize = rf.readShort();
os_2.ySubscriptXOffset = rf.readShort();
os_2.ySubscriptYOffset = rf.readShort();
os_2.ySuperscriptXSize = rf.readShort();
os_2.ySuperscriptYSize = rf.readShort();
os_2.ySuperscriptXOffset = rf.readShort();
os_2.ySuperscriptYOffset = rf.readShort();
os_2.yStrikeoutSize = rf.readShort();
os_2.yStrikeoutPosition = rf.readShort();
os_2.sFamilyClass = rf.readShort();
rf.readFully(os_2.panose);
rf.skipBytes(16);
rf.readFully(os_2.achVendID);
os_2.fsSelection = rf.readUnsignedShort();
os_2.usFirstCharIndex = rf.readUnsignedShort();
os_2.usLastCharIndex = rf.readUnsignedShort();
os_2.sTypoAscender = rf.readShort();
os_2.sTypoDescender = rf.readShort();
if (os_2.sTypoDescender > 0) os_2.sTypoDescender = (short) (-os_2.sTypoDescender);
os_2.sTypoLineGap = rf.readShort();
os_2.usWinAscent = rf.readUnsignedShort();
os_2.usWinDescent = rf.readUnsignedShort();
os_2.ulCodePageRange1 = 0;
os_2.ulCodePageRange2 = 0;
if (version > 0) {
os_2.ulCodePageRange1 = rf.readInt();
os_2.ulCodePageRange2 = rf.readInt();
}
if (version > 1) {
rf.skipBytes(2);
os_2.sCapHeight = rf.readShort();
} else os_2.sCapHeight = (int) (0.7 * head.unitsPerEm);
}
private void readBbox() throws DocumentException, IOException {
int tableLocation[];
tableLocation = (int[]) positionTables.get("head");
if (tableLocation == null)
throw new DocumentException("Table 'head' does not exist in " + fileName + style);
rf.seek(tableLocation[0] + HEAD_LOCA_FORMAT_OFFSET);
boolean locaShortTable = (rf.readUnsignedShort() == 0);
tableLocation = (int[]) positionTables.get("loca");
if (tableLocation == null) return;
rf.seek(tableLocation[0]);
int locaTable[];
if (locaShortTable) {
int entries = tableLocation[1] / 2;
locaTable = new int[entries];
for (int k = 0; k < entries; ++k) locaTable[k] = rf.readUnsignedShort() * 2;
} else {
int entries = tableLocation[1] / 4;
locaTable = new int[entries];
for (int k = 0; k < entries; ++k) locaTable[k] = rf.readInt();
}
tableLocation = (int[]) positionTables.get("glyf");
if (tableLocation == null)
throw new DocumentException("Table 'glyf' does not exist in " + fileName + style);
int tableGlyphOffset = tableLocation[0];
bboxes = new int[locaTable.length - 1][];
for (int glyph = 0; glyph < locaTable.length - 1; ++glyph) {
int start = locaTable[glyph];
if (start != locaTable[glyph + 1]) {
rf.seek(tableGlyphOffset + start + 2);
bboxes[glyph] =
new int[] {
(rf.readShort() * 1000) / head.unitsPerEm,
(rf.readShort() * 1000) / head.unitsPerEm,
(rf.readShort() * 1000) / head.unitsPerEm,
(rf.readShort() * 1000) / head.unitsPerEm
};
}
}
}
/**
* Reads the font data.
*
* @param ttfAfm the font as a <CODE>byte</CODE> array, possibly <CODE>null</CODE>
* @throws DocumentException the font is invalid
* @throws IOException the font file could not be read
*/
void process() throws DocumentException, IOException {
positionTables = new HashMap<String, int[]>();
metadataTables = new HashMap<String, byte[]>();
try {
rf = new RandomAccessFileOrArray(fileName);
if (ttcIndex.length() > 0) {
int dirIdx = Integer.parseInt(ttcIndex);
if (dirIdx < 0)
throw new DocumentException("The font index for " + fileName + " must be positive.");
String mainTag = readStandardString(4);
if (!mainTag.equals("ttcf"))
throw new DocumentException(fileName + " is not a valid TTC file.");
rf.skipBytes(4);
int dirCount = rf.readInt();
if (dirIdx >= dirCount)
throw new DocumentException(
"The font index for "
+ fileName
+ " must be between 0 and "
+ (dirCount - 1)
+ ". It was "
+ dirIdx
+ ".");
rf.skipBytes(dirIdx * 4);
directoryOffset = rf.readInt();
}
rf.seek(directoryOffset);
rf.readFully(directoryRawData);
int ttId = Util.getInt(directoryRawData, 0);
if (ttId != 0x00010000 && ttId != 0x4F54544F)
throw new DocumentException(fileName + " is not a valid TTF or OTF file.");
int num_tables = Util.getUnsignedShort(directoryRawData, 4);
for (int k = 0; k < num_tables; ++k) {
byte[] rawData = new byte[16];
rf.readFully(rawData);
String tag = getStandardString(rawData, 0, 4);
int table_location[] = new int[2];
table_location[0] = Util.getInt(rawData, 8);
table_location[1] = Util.getInt(rawData, 12);
positionTables.put(tag, table_location);
metadataTables.put(tag, rawData);
}
fontName = getBaseFont();
fullName = getNames(4); // full name
familyName = getNames(1); // family name
notice = getNames(0);
version = getNames(5);
if (!justNames) {
fillTables();
readGlyphWidths();
readCMaps();
readKerning();
readBbox();
GlyphWidths = null;
}
} finally {
if (rf != null) {
rf.close();
if (!embedded) rf = null;
}
}
}
