public static async Task<EncodingHelper> GetDBCSEncoding(string name)
{
name = name.ToLower();
EncodingHelper encoding = new EncodingHelper();
encoding._webName = name;
if (_cache.ContainsKey(name))
{
var tuple = _cache[name];
encoding._dbcsToUnicode = tuple.Item1;
encoding._unicodeToDbcs = tuple.Item2;
return encoding;
}
var dbcsToUnicode = new char[0x10000];
var unicodeToDbcs = new ushort[0x10000];
using (Stream stream = await GetInstall())
using (BinaryReader reader = new BinaryReader(stream))
{
for (int i = 0; i < 0xffff; i++)
{
ushort u = reader.ReadUInt16();
unicodeToDbcs[i] = u;
}
for (int i = 0; i < 0xffff; i++)
{
ushort u = reader.ReadUInt16();
dbcsToUnicode[i] = (char)u;
}
}
_cache[name] = new Tuple<char[], ushort[]>(dbcsToUnicode, unicodeToDbcs);
encoding._dbcsToUnicode = dbcsToUnicode;
encoding._unicodeToDbcs = unicodeToDbcs;
return encoding;
}
public DBCSDecoder(EncodingHelper encoding)
{
_encoding = encoding;
}
