diff options
Diffstat (limited to 'core/src/main/java/org/bouncycastle/asn1/DEREnumerated.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/asn1/DEREnumerated.java | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/asn1/DEREnumerated.java b/core/src/main/java/org/bouncycastle/asn1/DEREnumerated.java new file mode 100644 index 00000000..2f299ee2 --- /dev/null +++ b/core/src/main/java/org/bouncycastle/asn1/DEREnumerated.java @@ -0,0 +1,158 @@ +package org.bouncycastle.asn1; + +import java.io.IOException; +import java.math.BigInteger; + +import org.bouncycastle.util.Arrays; + +public class DEREnumerated + extends ASN1Primitive +{ + byte[] bytes; + + /** + * return an integer from the passed in object + * + * @exception IllegalArgumentException if the object cannot be converted. + */ + public static ASN1Enumerated getInstance( + Object obj) + { + if (obj == null || obj instanceof ASN1Enumerated) + { + return (ASN1Enumerated)obj; + } + + if (obj instanceof DEREnumerated) + { + return new ASN1Enumerated(((DEREnumerated)obj).getValue()); + } + + if (obj instanceof byte[]) + { + try + { + return (ASN1Enumerated)fromByteArray((byte[])obj); + } + catch (Exception e) + { + throw new IllegalArgumentException("encoding error in getInstance: " + e.toString()); + } + } + + throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); + } + + /** + * return an Enumerated from a tagged object. + * + * @param obj the tagged object holding the object we want + * @param explicit true if the object is meant to be explicitly + * tagged false otherwise. + * @exception IllegalArgumentException if the tagged object cannot + * be converted. + */ + public static DEREnumerated getInstance( + ASN1TaggedObject obj, + boolean explicit) + { + ASN1Primitive o = obj.getObject(); + + if (explicit || o instanceof DEREnumerated) + { + return getInstance(o); + } + else + { + return fromOctetString(((ASN1OctetString)o).getOctets()); + } + } + + public DEREnumerated( + int value) + { + bytes = BigInteger.valueOf(value).toByteArray(); + } + + public DEREnumerated( + BigInteger value) + { + bytes = value.toByteArray(); + } + + public DEREnumerated( + byte[] bytes) + { + this.bytes = bytes; + } + + public BigInteger getValue() + { + return new BigInteger(bytes); + } + + boolean isConstructed() + { + return false; + } + + int encodedLength() + { + return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length; + } + + void encode( + ASN1OutputStream out) + throws IOException + { + out.writeEncoded(BERTags.ENUMERATED, bytes); + } + + boolean asn1Equals( + ASN1Primitive o) + { + if (!(o instanceof DEREnumerated)) + { + return false; + } + + DEREnumerated other = (DEREnumerated)o; + + return Arrays.areEqual(this.bytes, other.bytes); + } + + public int hashCode() + { + return Arrays.hashCode(bytes); + } + + private static ASN1Enumerated[] cache = new ASN1Enumerated[12]; + + static ASN1Enumerated fromOctetString(byte[] enc) + { + if (enc.length > 1) + { + return new ASN1Enumerated(Arrays.clone(enc)); + } + + if (enc.length == 0) + { + throw new IllegalArgumentException("ENUMERATED has zero length"); + } + int value = enc[0] & 0xff; + + if (value >= cache.length) + { + return new ASN1Enumerated(Arrays.clone(enc)); + } + + ASN1Enumerated possibleMatch = cache[value]; + + if (possibleMatch == null) + { + possibleMatch = cache[value] = new ASN1Enumerated(Arrays.clone(enc)); + } + + return possibleMatch; + } +} |