1 files changed, 117 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/CompressedData.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/CompressedData.java
new file mode 100644
index 000000000..88d3c458c
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/CompressedData.java
@@ -0,0 +1,117 @@
+package org.spongycastle.asn1.cms;
+
+import org.spongycastle.asn1.ASN1EncodableVector;
+import org.spongycastle.asn1.ASN1Integer;
+import org.spongycastle.asn1.ASN1Object;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.ASN1TaggedObject;
+import org.spongycastle.asn1.BERSequence;
+import org.spongycastle.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 &rarr; null
+     * <li> {@link CompressedData} object
+     * <li> {@link org.spongycastle.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);
+    }
+}