package org.bouncycastle.asn1;

import java.io.IOException;
import java.io.OutputStream;

Stream that produces output based on the default encoding for the passed in objects.
/** * Stream that produces output based on the default encoding for the passed in objects. */
public class ASN1OutputStream { private OutputStream os; public ASN1OutputStream( OutputStream os) { this.os = os; } void writeLength( int length) throws IOException { if (length > 127) { int size = 1; int val = length; while ((val >>>= 8) != 0) { size++; } write((byte)(size | 0x80)); for (int i = (size - 1) * 8; i >= 0; i -= 8) { write((byte)(length >> i)); } } else { write((byte)length); } } void write(int b) throws IOException { os.write(b); } void write(byte[] bytes) throws IOException { os.write(bytes); } void write(byte[] bytes, int off, int len) throws IOException { os.write(bytes, off, len); } void writeEncoded( int tag, byte[] bytes) throws IOException { write(tag); writeLength(bytes.length); write(bytes); } void writeTag(int flags, int tagNo) throws IOException { if (tagNo < 31) { write(flags | tagNo); } else { write(flags | 0x1f); if (tagNo < 128) { write(tagNo); } else { byte[] stack = new byte[5]; int pos = stack.length; stack[--pos] = (byte)(tagNo & 0x7F); do { tagNo >>= 7; stack[--pos] = (byte)(tagNo & 0x7F | 0x80); } while (tagNo > 127); write(stack, pos, stack.length - pos); } } } void writeEncoded(int flags, int tagNo, byte[] bytes) throws IOException { writeTag(flags, tagNo); writeLength(bytes.length); write(bytes); } protected void writeNull() throws IOException { os.write(BERTags.NULL); os.write(0x00); } public void writeObject( ASN1Encodable obj) throws IOException { if (obj != null) { obj.toASN1Primitive().encode(this); } else { throw new IOException("null object detected"); } } void writeImplicitObject(ASN1Primitive obj) throws IOException { if (obj != null) { obj.encode(new ImplicitOutputStream(os)); } else { throw new IOException("null object detected"); } } public void close() throws IOException { os.close(); } public void flush() throws IOException { os.flush(); } ASN1OutputStream getDERSubStream() { return new DEROutputStream(os); } ASN1OutputStream getDLSubStream() { return new DLOutputStream(os); } private class ImplicitOutputStream extends ASN1OutputStream { private boolean first = true; public ImplicitOutputStream(OutputStream os) { super(os); } public void write(int b) throws IOException { if (first) { first = false; } else { super.write(b); } } } }