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package org.spongycastle.bcpg.sig;
import org.spongycastle.bcpg.SignatureSubpacket;
import org.spongycastle.bcpg.SignatureSubpacketTags;
public class Features
extends SignatureSubpacket
{
/** Identifier for the modification detection feature */
public static final byte FEATURE_MODIFICATION_DETECTION = 1;
private static final byte[] featureToByteArray(byte feature)
{
byte[] data = new byte[1];
data[0] = feature;
return data;
}
public Features(boolean critical, byte[] data)
{
super(SignatureSubpacketTags.FEATURES, critical, data);
}
public Features(boolean critical, byte feature)
{
super(SignatureSubpacketTags.FEATURES, critical, featureToByteArray(feature));
}
/**
* Returns if modification detection is supported.
*/
public boolean supportsModificationDetection()
{
return supportsFeature(FEATURE_MODIFICATION_DETECTION);
}
// /** Class should be immutable.
// * Set modification detection support.
// */
// public void setSupportsModificationDetection(boolean support)
// {
// setSupportsFeature(FEATURE_MODIFICATION_DETECTION, support);
// }
/**
* Returns if a particular feature is supported.
*/
public boolean supportsFeature(byte feature)
{
for (int i = 0; i < data.length; i++)
{
if (data[i] == feature)
{
return true;
}
}
return false;
}
/**
* Sets support for a particular feature.
*/
private void setSupportsFeature(byte feature, boolean support)
{
if (feature == 0)
{
throw new IllegalArgumentException("feature == 0");
}
if (supportsFeature(feature) != support)
{
if (support == true)
{
byte[] temp = new byte[data.length + 1];
System.arraycopy(data, 0, temp, 0, data.length);
temp[data.length] = feature;
data = temp;
}
else
{
for (int i = 0; i < data.length; i++)
{
if (data[i] == feature)
{
byte[] temp = new byte[data.length - 1];
System.arraycopy(data, 0, temp, 0, i);
System.arraycopy(data, i + 1, temp, i, temp.length - i);
data = temp;
break;
}
}
}
}
}
}
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