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using System;
using System.IO;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Utilities.IO.Pem
{
/**
* A generic PEM writer, based on RFC 1421
*/
public class PemWriter
{
private const int LineLength = 64;
private readonly TextWriter writer;
private readonly int nlLength;
private char[] buf = new char[LineLength];
/**
* Base constructor.
*
* @param out output stream to use.
*/
public PemWriter(TextWriter writer)
{
if (writer == null)
throw new ArgumentNullException("writer");
this.writer = writer;
this.nlLength = Environment.NewLine.Length;
}
public TextWriter Writer
{
get { return writer; }
}
/**
* Return the number of bytes or characters required to contain the
* passed in object if it is PEM encoded.
*
* @param obj pem object to be output
* @return an estimate of the number of bytes
*/
public int GetOutputSize(PemObject obj)
{
// BEGIN and END boundaries.
int size = (2 * (obj.Type.Length + 10 + nlLength)) + 6 + 4;
if (obj.Headers.Count > 0)
{
foreach (PemHeader header in obj.Headers)
{
size += header.Name.Length + ": ".Length + header.Value.Length + nlLength;
}
size += nlLength;
}
// base64 encoding
int dataLen = ((obj.Content.Length + 2) / 3) * 4;
size += dataLen + (((dataLen + LineLength - 1) / LineLength) * nlLength);
return size;
}
public void WriteObject(PemObjectGenerator objGen)
{
PemObject obj = objGen.Generate();
WritePreEncapsulationBoundary(obj.Type);
if (obj.Headers.Count > 0)
{
foreach (PemHeader header in obj.Headers)
{
writer.Write(header.Name);
writer.Write(": ");
writer.WriteLine(header.Value);
}
writer.WriteLine();
}
WriteEncoded(obj.Content);
WritePostEncapsulationBoundary(obj.Type);
}
private void WriteEncoded(byte[] bytes)
{
bytes = Base64.Encode(bytes);
for (int i = 0; i < bytes.Length; i += buf.Length)
{
int index = 0;
while (index != buf.Length)
{
if ((i + index) >= bytes.Length)
break;
buf[index] = (char)bytes[i + index];
index++;
}
writer.WriteLine(buf, 0, index);
}
}
private void WritePreEncapsulationBoundary(string type)
{
writer.WriteLine("-----BEGIN " + type + "-----");
}
private void WritePostEncapsulationBoundary(string type)
{
writer.WriteLine("-----END " + type + "-----");
}
}
}
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