@Nullable
@ReturnsMutableCopy
public static byte[] getDecodedASCIIHex(@Nullable final byte[] aEncodedBuffer) {
if (aEncodedBuffer == null) return null;
final NonBlockingByteArrayOutputStream aBAOS = new NonBlockingByteArrayOutputStream();
try {
boolean bFirstByte = true;
int nFirstByte = 0;
for (final byte nEncByte : aEncodedBuffer) {
if (nEncByte == '>') break;
// Ignore whitespaces
if (Character.isWhitespace(nEncByte)) continue;
final byte nDecByte = (byte) StringHelper.getHexValue((char) nEncByte);
if (nDecByte == CGlobal.ILLEGAL_UINT)
throw new DecodeException(
"Failed to convert byte '"
+ nEncByte
+ "/"
+ ((char) nEncByte)
+ "' to hex value in ASCIIHexDecode");
if (bFirstByte) nFirstByte = nDecByte;
else aBAOS.write((byte) (nFirstByte << 4 | nDecByte));
bFirstByte = !bFirstByte;
}
// Write trailing byte
if (!bFirstByte) aBAOS.write((byte) (nFirstByte << 4));
return aBAOS.toByteArray();
} finally {
StreamHelper.close(aBAOS);
}
}
