ACE_TString b32h_encode(const ACE_TCHAR* decoded)
{
static const ACE_TCHAR lookup[] =
ACE_TEXT("0123456789ABCDEFGHIJKLMNOPQRSTUV");
static const ACE_TCHAR padding[] = ACE_TEXT("======");
static const size_t enc[] = {0, 2, 4, 5, 7}; // #input -> #non-padded output
ACE_TString encoded;
for (size_t len = ACE_OS::strlen(decoded); *decoded; decoded += 5, len -= 5) {
ACE_UINT64 chunk = 0;
for (size_t i(0); i < 5 && i < len; ++i) {
chunk |= static_cast<ACE_UINT64>(decoded[i] & 0xFF) << ((4 - i) * 8);
}
size_t limit = (len < 5) ? enc[len] : 8;
for (size_t i(0); i < limit; ++i) {
unsigned char val =
static_cast<unsigned char>(chunk >>((7 - i) * 5)) & 0x1F;
encoded += lookup[val];
}
if (len < 5) {
encoded.append(padding, 8 - enc[len]);
return encoded;
}
}
return encoded;
}
