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package org.bouncycastle.asn1;
import java.io.IOException;
import org.bouncycastle.util.Arrays;
/**
* Base class for an application specific object
*/
public abstract class ASN1ApplicationSpecific
extends ASN1Primitive
{
protected final boolean isConstructed;
protected final int tag;
protected final byte[] octets;
ASN1ApplicationSpecific(
boolean isConstructed,
int tag,
byte[] octets)
{
this.isConstructed = isConstructed;
this.tag = tag;
this.octets = octets;
}
/**
* Return an ASN1ApplicationSpecific from the passed in object, which may be a byte array, or null.
*
* @param obj the object to be converted.
* @return obj's representation as an ASN1ApplicationSpecific object.
*/
public static ASN1ApplicationSpecific getInstance(Object obj)
{
if (obj == null || obj instanceof ASN1ApplicationSpecific)
{
return (ASN1ApplicationSpecific)obj;
}
else if (obj instanceof byte[])
{
try
{
return ASN1ApplicationSpecific.getInstance(ASN1Primitive.fromByteArray((byte[])obj));
}
catch (IOException e)
{
throw new IllegalArgumentException("Failed to construct object from byte[]: " + e.getMessage());
}
}
throw new IllegalArgumentException("unknown object in getInstance: " + obj.getClass().getName());
}
protected static int getLengthOfHeader(byte[] data)
{
int length = data[1] & 0xff; // TODO: assumes 1 byte tag
if (length == 0x80)
{
return 2; // indefinite-length encoding
}
if (length > 127)
{
int size = length & 0x7f;
// Note: The invalid long form "0xff" (see X.690 8.1.3.5c) will be caught here
if (size > 4)
{
throw new IllegalStateException("DER length more than 4 bytes: " + size);
}
return size + 2;
}
return 2;
}
/**
* Return true if the object is marked as constructed, false otherwise.
*
* @return true if constructed, otherwise false.
*/
public boolean isConstructed()
{
return isConstructed;
}
/**
* Return the contents of this object as a byte[]
*
* @return the encoded contents of the object.
*/
public byte[] getContents()
{
return octets;
}
/**
* Return the tag number associated with this object,
*
* @return the application tag number.
*/
public int getApplicationTag()
{
return tag;
}
/**
* Return the enclosed object assuming explicit tagging.
*
* @return the resulting object
* @throws IOException if reconstruction fails.
*/
public ASN1Primitive getObject()
throws IOException
{
return new ASN1InputStream(getContents()).readObject();
}
/**
* Return the enclosed object assuming implicit tagging.
*
* @param derTagNo the type tag that should be applied to the object's contents.
* @return the resulting object
* @throws IOException if reconstruction fails.
*/
public ASN1Primitive getObject(int derTagNo)
throws IOException
{
if (derTagNo >= 0x1f)
{
throw new IOException("unsupported tag number");
}
byte[] orig = this.getEncoded();
byte[] tmp = replaceTagNumber(derTagNo, orig);
if ((orig[0] & BERTags.CONSTRUCTED) != 0)
{
tmp[0] |= BERTags.CONSTRUCTED;
}
return new ASN1InputStream(tmp).readObject();
}
int encodedLength()
throws IOException
{
return StreamUtil.calculateTagLength(tag) + StreamUtil.calculateBodyLength(octets.length) + octets.length;
}
/* (non-Javadoc)
* @see org.bouncycastle.asn1.ASN1Primitive#encode(org.bouncycastle.asn1.DEROutputStream)
*/
void encode(ASN1OutputStream out) throws IOException
{
int classBits = BERTags.APPLICATION;
if (isConstructed)
{
classBits |= BERTags.CONSTRUCTED;
}
out.writeEncoded(classBits, tag, octets);
}
boolean asn1Equals(
ASN1Primitive o)
{
if (!(o instanceof ASN1ApplicationSpecific))
{
return false;
}
ASN1ApplicationSpecific other = (ASN1ApplicationSpecific)o;
return isConstructed == other.isConstructed
&& tag == other.tag
&& Arrays.areEqual(octets, other.octets);
}
public int hashCode()
{
return (isConstructed ? 1 : 0) ^ tag ^ Arrays.hashCode(octets);
}
private byte[] replaceTagNumber(int newTag, byte[] input)
throws IOException
{
int tagNo = input[0] & 0x1f;
int index = 1;
//
// with tagged object tag number is bottom 5 bits, or stored at the start of the content
//
if (tagNo == 0x1f)
{
tagNo = 0;
int b = input[index++] & 0xff;
// X.690-0207 8.1.2.4.2
// "c) bits 7 to 1 of the first subsequent octet shall not all be zero."
if ((b & 0x7f) == 0) // Note: -1 will pass
{
throw new ASN1ParsingException("corrupted stream - invalid high tag number found");
}
while ((b >= 0) && ((b & 0x80) != 0))
{
tagNo |= (b & 0x7f);
tagNo <<= 7;
b = input[index++] & 0xff;
}
// tagNo |= (b & 0x7f);
}
byte[] tmp = new byte[input.length - index + 1];
System.arraycopy(input, index, tmp, 1, tmp.length - 1);
tmp[0] = (byte)newTag;
return tmp;
}
}
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