private static StringBuilder EncodeWorker(string data, char empty, EncodeChar encFunc)
{
StringBuilder res = new StringBuilder();
int bits;
for (int i = 0; i < data.Length; i += 3)
{
switch (data.Length - i)
{
case 1:
// only one char, emit 2 bytes &
// padding
bits = (data[i] & 0xff) << 16;
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(empty);
res.Append(empty);
break;
case 2:
// only two chars, emit 3 bytes &
// padding
bits = ((data[i] & 0xff) << 16) | ((data[i + 1] & 0xff) << 8);
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(encFunc((bits >> 6) & 0x3f));
res.Append(empty);
break;
default:
// got all 3 bytes, just emit it.
bits = ((data[i] & 0xff) << 16) |
((data[i + 1] & 0xff) << 8) |
((data[i + 2] & 0xff));
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(encFunc((bits >> 6) & 0x3f));
res.Append(encFunc(bits & 0x3f));
break;
}
}
return(res);
}
private static StringBuilder EncodeWorker(string data, int lineBreak, char empty, EncodeChar encFunc) {
StringBuilder res = new StringBuilder();
int bits;
int lineCount = 0;
for (int i = 0; i < data.Length; i += 3) {
switch (data.Length - i) {
case 1:
// only one char, emit 2 bytes &
// padding
bits = (data[i] & 0xff) << 16;
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(empty);
res.Append(empty);
break;
case 2:
// only two chars, emit 3 bytes &
// padding
bits = ((data[i] & 0xff) << 16) | ((data[i + 1] & 0xff) << 8);
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(encFunc((bits >> 6) & 0x3f));
res.Append(empty);
break;
default:
// got all 3 bytes, just emit it.
bits = ((data[i] & 0xff) << 16) |
((data[i + 1] & 0xff) << 8) |
((data[i + 2] & 0xff));
res.Append(encFunc((bits >> 18) & 0x3f));
res.Append(encFunc((bits >> 12) & 0x3f));
res.Append(encFunc((bits >> 6) & 0x3f));
res.Append(encFunc(bits & 0x3f));
break;
}
if (((res.Length - (lineCount)) % lineBreak) == 0) {
res.Append('\n');
lineCount++;
}
}
return res;
}
