public void WriteZString([NotNull] string str, bool withLength, StringEncoderMode mode = StringEncoderMode.Normal)
{
MaybeProcessEscapeChars(ref str);
var zstr = StringEncoder.Encode(str, mode);
if (FinalPass && AbbreviateMode)
{
AbbrevFinder.AddText(str);
}
if (withLength)
{
WriteByte((byte)(zstr.Length / 2));
}
position += zstr.Length;
stream?.Write(zstr, 0, zstr.Length);
}
public byte[] Encode(string str, int?size, StringEncoderMode mode, out int zchars)
{
var noAbbrevs = mode == StringEncoderMode.NoAbbreviations;
if (!noAbbrevs)
{
Frozen = true;
}
var temp = new List <byte>();
var sb = new StringBuilder(str);
// temporarily replace abbreviated strings with Unicode private use characters (E000-E05F)
if (!noAbbrevs)
{
for (int i = 0; i < abbrevs.Count; i++)
{
var idx = abbrevs[i].Pattern.FindIn(sb);
while (idx >= 0)
{
sb.Remove(idx, abbrevs[i].Pattern.Text.Length - 1);
sb[idx] = (char)(0xE000 + abbrevs[i].Number);
idx = abbrevs[i].Pattern.FindIn(sb);
}
}
}
for (int i = 0; i < sb.Length; i++)
{
char c = sb[i];
if (c == ' ')
{
temp.Add(0);
}
else if (c == '\n')
{
temp.Add(5);
temp.Add(7);
}
else if (!noAbbrevs && c >= '\ue000' && c < '\ue060')
{
int abbrNum = c - '\ue000';
temp.Add((byte)(1 + abbrNum / 32));
temp.Add((byte)(abbrNum % 32));
}
else
{
if (UnicodeTranslation.Table.TryGetValue(c, out byte b) == false)
{
b = (byte)c;
}
int idx;
if ((idx = Array.IndexOf(charset[0], b)) >= 0)
{
temp.Add((byte)(idx + 6));
}
else if ((idx = Array.IndexOf(charset[1], b)) >= 0)
{
temp.Add(4);
temp.Add((byte)(idx + 6));
}
else if ((idx = Array.IndexOf(charset[2], b)) >= 0)
{
temp.Add(5);
temp.Add((byte)(idx + 8));
}
else
{
temp.Add(5);
temp.Add(6);
temp.Add((byte)((b >> 5) & 31));
temp.Add((byte)(b & 31));
}
}
}
zchars = temp.Count;
int resultSize;
if (size == null)
{
if (temp.Count == 0)
{
temp.Add(5);
}
while (temp.Count % 3 != 0)
{
temp.Add(5);
}
resultSize = temp.Count * 2 / 3;
}
else
{
while (temp.Count < size)
{
temp.Add(5);
}
resultSize = size.Value * 2 / 3;
}
var result = new byte[Math.Min(resultSize, temp.Count * 2 / 3)];
for (int i = 0, t = 0; i < result.Length;)
{
// _aaaaabb bbbccccc
byte a = temp[t++], b = temp[t++], c = temp[t++];
result[i++] = (byte)(a << 2 | b >> 3);
result[i++] = (byte)(b << 5 | c);
}
if (result.Length >= 2)
{
result[result.Length - 2] |= 0x80;
}
return(result);
}
public byte[] Encode(string str, StringEncoderMode mode) => Encode(str, null, mode);
public byte[] Encode(string str, int?size, StringEncoderMode mode) => Encode(str, size, mode, out _);