/** Writes out to disk the header, and then all the properties */
public void writeOut(OutputStream o) throws IOException {
// First goes the number of characters we affect
StyleTextPropAtom.writeLittleEndian(charactersCovered, o);
// Then we have the reserved field if required
if (reservedField > -1) {
StyleTextPropAtom.writeLittleEndian(reservedField, o);
}
// Then the mask field
int mask = maskSpecial;
for (int i = 0; i < textPropList.size(); i++) {
TextProp textProp = (TextProp) textPropList.get(i);
// sometimes header indicates that the bitmask is present but its value is 0
if (textProp instanceof BitMaskTextProp) {
if (mask == 0) mask |= textProp.getWriteMask();
} else {
mask |= textProp.getWriteMask();
}
}
StyleTextPropAtom.writeLittleEndian(mask, o);
// Then the contents of all the properties
for (int i = 0; i < textPropList.size(); i++) {
TextProp textProp = textPropList.get(i);
int val = textProp.getValue();
if (textProp.getSize() == 2) {
StyleTextPropAtom.writeLittleEndian((short) val, o);
} else if (textProp.getSize() == 4) {
StyleTextPropAtom.writeLittleEndian(val, o);
}
}
}
/**
* For an existing set of text properties, build the list of properties coded for in a given run
* of properties.
*
* @return the number of bytes that were used encoding the properties list
*/
public int buildTextPropList(
int containsField, TextProp[] potentialProperties, byte[] data, int dataOffset) {
int bytesPassed = 0;
// For each possible entry, see if we match the mask
// If we do, decode that, save it, and shuffle on
for (int i = 0; i < potentialProperties.length; i++) {
// Check there's still data left to read
// Check if this property is found in the mask
if ((containsField & potentialProperties[i].getMask()) != 0) {
if (dataOffset + bytesPassed >= data.length) {
// Out of data, can't be any more properties to go
// remember the mask and return
maskSpecial |= potentialProperties[i].getMask();
return bytesPassed;
}
// Bingo, data contains this property
TextProp prop = (TextProp) potentialProperties[i].clone();
int val = 0;
if (prop.getSize() == 2) {
val = LittleEndian.getShort(data, dataOffset + bytesPassed);
} else if (prop.getSize() == 4) {
val = LittleEndian.getInt(data, dataOffset + bytesPassed);
} else if (prop.getSize() == 0) {
// remember "special" bits.
maskSpecial |= potentialProperties[i].getMask();
continue;
}
prop.setValue(val);
bytesPassed += prop.getSize();
textPropList.add(prop);
}
}
// Return how many bytes were used
return bytesPassed;
}
