/**
* Writes out to disk the header, and then all the properties
*/
public void WriteOut(Stream o)
{
// 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.Count; i++)
{
TextProp textProp = (TextProp)textPropList[i];
//sometimes header indicates that the bitmask is present but its value is 0
if (textProp is 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.Count; i++)
{
TextProp textProp = textPropList[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);
}
