/// <summary>
/// Create a new DerInteger for the value.
/// </summary>
///
/// <param name="integer">The value to encode.</param>
public DerInteger(int integer)
: base(net.named_data.jndn.encoding.der.DerNodeType.Integer)
{
if (integer < 0)
throw new DerEncodingException(
"DerInteger: Negative integers are not currently supported");
// Convert the integer to bytes the easy/slow way.
DynamicByteBuffer temp = new DynamicByteBuffer(10);
// We encode backwards from the back.
temp.position(temp.limit());
while (true) {
temp.ensuredPutFromBack((byte) (integer & 0xff));
integer >>= 8;
if (integer <= 0)
// We check for 0 at the end so we encode one byte if it is 0.
break;
}
if ((((int) temp.buffer().get(temp.position())) & 0xff) >= 0x80)
// Make it a non-negative integer.
temp.ensuredPutFromBack((byte) 0);
payload_.ensuredPut(temp.buffer().slice());
encodeHeader(payload_.position());
}
/// <summary>
/// Compute the encoding for one part of an OID, where values greater than 128 must be encoded as multiple bytes.
/// </summary>
///
/// <param name="value">A component of an OID.</param>
/// <returns>The encoded buffer.</returns>
public static ByteBuffer encode128(int value_ren)
{
int mask = (1 << 7) - 1;
DynamicByteBuffer outBytes = new DynamicByteBuffer(10);
// We encode backwards from the back.
outBytes.position(outBytes.limit());
if (value_ren < 128)
outBytes.ensuredPutFromBack((byte) (value_ren & mask));
else {
outBytes.ensuredPutFromBack((byte) (value_ren & mask));
value_ren >>= 7;
while (value_ren != 0) {
outBytes.ensuredPutFromBack((byte) ((value_ren & mask) | (1 << 7)));
value_ren >>= 7;
}
}
return outBytes.buffer().slice();
}
/// <summary>
/// Encode the given size and update the header.
/// </summary>
///
/// <param name="size">The payload size to encode.</param>
protected internal void encodeHeader(int size)
{
DynamicByteBuffer buffer = new DynamicByteBuffer(10);
buffer.ensuredPut((byte) nodeType_);
if (size < 0)
// We don't expect this to happen since this is a protected method and
// always called with the non-negative size() of some buffer.
throw new Exception("encodeHeader: DER object has negative length");
else if (size <= 127)
buffer.ensuredPut((byte) (size & 0xff));
else {
DynamicByteBuffer tempBuf = new DynamicByteBuffer(10);
// We encode backwards from the back.
tempBuf.position(tempBuf.limit());
int val = size;
int n = 0;
while (val != 0) {
tempBuf.ensuredPutFromBack((byte) (val & 0xff));
val >>= 8;
n += 1;
}
tempBuf.ensuredPutFromBack((byte) (((1 << 7) | n) & 0xff));
buffer.ensuredPut(tempBuf.buffer());
}
header_ = buffer.flippedBuffer();
}