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package org.spongycastle.asn1;
import java.io.IOException;
import java.io.OutputStream;
/**
* 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);
}
}
}
}
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