public static async Task <Encoding> GetDbcsEncoding(string name)
{
try
{
return(GetEncoding(name));
}
catch
{
//not supported by system
}
name = name.ToLower();
var encoding = new DbcsEncoding {
_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];
try
{
var file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(
new Uri(string.Format("ms-appx:///EncodingMaps/{0}.bin", name)));
using (var fs = await file.OpenReadAsync())
using (var reader = new Windows.Storage.Streams.DataReader(fs))
{
await reader.LoadAsync((uint)fs.Size);
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);
}
catch
{
return(null);
}
}