| package org.bouncycastle.asn1.cms; |
| |
| import org.bouncycastle.asn1.ASN1EncodableVector; |
| import org.bouncycastle.asn1.ASN1Integer; |
| import org.bouncycastle.asn1.ASN1Object; |
| import org.bouncycastle.asn1.ASN1Primitive; |
| import org.bouncycastle.asn1.ASN1Sequence; |
| import org.bouncycastle.asn1.ASN1TaggedObject; |
| import org.bouncycastle.asn1.BERSequence; |
| import org.bouncycastle.asn1.x509.AlgorithmIdentifier; |
| |
| /** |
| * <a href="http://tools.ietf.org/html/rfc3274">RFC 3274</a>: CMS Compressed Data. |
| * |
| * <pre> |
| * CompressedData ::= SEQUENCE { |
| * version CMSVersion, |
| * compressionAlgorithm CompressionAlgorithmIdentifier, |
| * encapContentInfo EncapsulatedContentInfo |
| * } |
| * </pre> |
| */ |
| public class CompressedData |
| extends ASN1Object |
| { |
| private ASN1Integer version; |
| private AlgorithmIdentifier compressionAlgorithm; |
| private ContentInfo encapContentInfo; |
| |
| public CompressedData( |
| AlgorithmIdentifier compressionAlgorithm, |
| ContentInfo encapContentInfo) |
| { |
| this.version = new ASN1Integer(0); |
| this.compressionAlgorithm = compressionAlgorithm; |
| this.encapContentInfo = encapContentInfo; |
| } |
| |
| private CompressedData( |
| ASN1Sequence seq) |
| { |
| this.version = (ASN1Integer)seq.getObjectAt(0); |
| this.compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1)); |
| this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2)); |
| } |
| |
| /** |
| * Return a CompressedData object from a tagged object. |
| * |
| * @param ato the tagged object holding the object we want. |
| * @param isExplicit true if the object is meant to be explicitly |
| * tagged false otherwise. |
| * @exception IllegalArgumentException if the object held by the |
| * tagged object cannot be converted. |
| */ |
| public static CompressedData getInstance( |
| ASN1TaggedObject ato, |
| boolean isExplicit) |
| { |
| return getInstance(ASN1Sequence.getInstance(ato, isExplicit)); |
| } |
| |
| /** |
| * Return a CompressedData object from the given object. |
| * <p> |
| * Accepted inputs: |
| * <ul> |
| * <li> null → null |
| * <li> {@link CompressedData} object |
| * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with CompressedData structure inside |
| * </ul> |
| * |
| * @param obj the object we want converted. |
| * @exception IllegalArgumentException if the object cannot be converted. |
| */ |
| public static CompressedData getInstance( |
| Object obj) |
| { |
| if (obj instanceof CompressedData) |
| { |
| return (CompressedData)obj; |
| } |
| |
| if (obj != null) |
| { |
| return new CompressedData(ASN1Sequence.getInstance(obj)); |
| } |
| |
| return null; |
| } |
| |
| public ASN1Integer getVersion() |
| { |
| return version; |
| } |
| |
| public AlgorithmIdentifier getCompressionAlgorithmIdentifier() |
| { |
| return compressionAlgorithm; |
| } |
| |
| public ContentInfo getEncapContentInfo() |
| { |
| return encapContentInfo; |
| } |
| |
| public ASN1Primitive toASN1Primitive() |
| { |
| ASN1EncodableVector v = new ASN1EncodableVector(); |
| |
| v.add(version); |
| v.add(compressionAlgorithm); |
| v.add(encapContentInfo); |
| |
| return new BERSequence(v); |
| } |
| } |