1 files changed, 100 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/BERGenerator.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/BERGenerator.java
new file mode 100644
index 000000000..0cca35c37
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/BERGenerator.java
@@ -0,0 +1,100 @@
+package org.spongycastle.asn1;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class BERGenerator
+    extends ASN1Generator
+{
+    private boolean      _tagged = false;
+    private boolean      _isExplicit;
+    private int          _tagNo;
+    
+    protected BERGenerator(
+        OutputStream out)
+    {
+        super(out);
+    }
+
+    public BERGenerator(
+        OutputStream out,
+        int tagNo,
+        boolean isExplicit) 
+    {
+        super(out);
+        
+        _tagged = true;
+        _isExplicit = isExplicit;
+        _tagNo = tagNo;
+    }
+
+    public OutputStream getRawOutputStream()
+    {
+        return _out;
+    }
+    
+    private void writeHdr(
+        int tag)
+        throws IOException
+    {
+        _out.write(tag);
+        _out.write(0x80);
+    }
+    
+    protected void writeBERHeader(
+        int tag) 
+        throws IOException
+    {
+        if (_tagged)
+        {
+            int tagNum = _tagNo | BERTags.TAGGED;
+
+            if (_isExplicit)
+            {
+                writeHdr(tagNum | BERTags.CONSTRUCTED);
+                writeHdr(tag);
+            }
+            else
+            {   
+                if ((tag & BERTags.CONSTRUCTED) != 0)
+                {
+                    writeHdr(tagNum | BERTags.CONSTRUCTED);
+                }
+                else
+                {
+                    writeHdr(tagNum);
+                }
+            }
+        }
+        else
+        {
+            writeHdr(tag);
+        }
+    }
+    
+    protected void writeBERBody(
+        InputStream contentStream)
+        throws IOException
+    {
+        int ch;
+        
+        while ((ch = contentStream.read()) >= 0)
+        {
+            _out.write(ch);
+        }
+    }
+
+    protected void writeBEREnd()
+        throws IOException
+    {
+        _out.write(0x00);
+        _out.write(0x00);
+        
+        if (_tagged && _isExplicit)  // write extra end for tag header
+        {
+            _out.write(0x00);
+            _out.write(0x00);
+        }
+    }
+}