private int FindASCIIOffset(byte i)
{
int offset;
for (offset = 0; offset < _UnicodeMappings.Count; offset++)
{
UnicodeMapping mapping = _UnicodeMappings[offset];
if (mapping.ASCIICharacters.Contains(i))
{
break;
}
}
return(offset);
}
public PCScreenFont(byte[] aFileData)
{
bool version1 = aFileData[0] == 0x36 && aFileData[1] == 0x04;
bool version2 = BitConverter.ToUInt32(aFileData, 0) == 0x864ab572;
//Check the header
if (!version1 && !version2)
{
Global.mDebugger.Send($"Invalid magic {aFileData[0]} {aFileData[1]} {aFileData[2]} {aFileData[3]}");
throw new Exception($"Invalid magic {aFileData[0]} {aFileData[1]} {aFileData[2]} {aFileData[3]}");
}
if (version1)
{
byte mode = aFileData[2];
CharHeight = aFileData[3];
CharWidth = 8; //Always 8 in this case
int length = (mode & (int)PSFVersion1Mode.MODE512) == 1 ? 512 : 256;
bool hasUnicodeTable = (mode & (int)PSFVersion1Mode.HASTAB) > 0;
ushort seperator = 0xFFFF;
ushort sequenceStart = 0xFFFE;
_FontData = new byte[length * CharHeight]; //Every row is one byte
for (int i = 0; i < length; i++)
{
for (int k = 0; k < CharHeight; k++)
{
_FontData[i * CharHeight + k] = aFileData[4 + i * CharHeight + k];
}
}
int position = 4 + length * CharHeight;
if (hasUnicodeTable)
{
_UnicodeMappings = new List <UnicodeMapping>();
var currentEntry = new List <byte>();
while (position < aFileData.Length)
{
if (BitConverter.ToUInt16(aFileData, position) == seperator)
{
var mapping = new UnicodeMapping
{
FontPosition = _UnicodeMappings.Count,
UnicodeCharacters = new List <ushort>(),
UnicodeCharactersWithModifiers = new List <ushort[]>(),
ASCIICharacters = new List <byte>()
};
for (int i = 0; i < currentEntry.Count / 2; i++)
{
mapping.UnicodeCharacters.Add(BitConverter.ToUInt16(currentEntry.ToArray(), i * 2));
}
//At this point we filter combined unicode letters out of the unicode charactesr
bool reachedFirstSeperator = false;
var unicodeCombination = new List <ushort>();
int index = 0;
while (index < mapping.UnicodeCharacters.Count)
{
if (mapping.UnicodeCharacters[index] == sequenceStart)
{
mapping.UnicodeCharacters.RemoveAt(index);
if (!reachedFirstSeperator)
{
reachedFirstSeperator = true;
}
else
{
mapping.UnicodeCharactersWithModifiers.Add(unicodeCombination.ToArray());
}
}
else
{
if (reachedFirstSeperator)
{
unicodeCombination.Add(mapping.UnicodeCharacters[index]);
mapping.UnicodeCharacters.RemoveAt(index);
}
else
{
index++;
}
}
}
// Now convert all the unicode characters we can to ASCII
foreach (var uc in mapping.UnicodeCharacters)
{
byte ac = Encoding.ASCII.GetBytes(Encoding.Unicode.GetString(BitConverter.GetBytes(uc)))[0];
if (ac == 63 && uc != 0x003F)
{
//ignore
}
else
{
if (!mapping.ASCIICharacters.Contains(ac))
{
mapping.ASCIICharacters.Add(ac);
}
}
}
_UnicodeMappings.Add(mapping);
currentEntry.Clear();
position++; //Skip the second seperator character as well
}
else
{
currentEntry.Add(aFileData[position]);
}
position++;
}
}
}
if (version2)
{
throw new NotImplementedException();
}
}
