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using System;
using System.Collections;
using System.IO;
using System.Text;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Utilities.IO.Pem
{
public class PemReader
{
private const string BeginString = "-----BEGIN ";
private const string EndString = "-----END ";
private readonly TextReader reader;
public PemReader(TextReader reader)
{
if (reader == null)
throw new ArgumentNullException("reader");
this.reader = reader;
}
public TextReader Reader
{
get { return reader; }
}
/// <returns>
/// A <see cref="PemObject"/>
/// </returns>
/// <exception cref="IOException"></exception>
public PemObject ReadPemObject()
{
string line = reader.ReadLine();
if (line != null && Platform.StartsWith(line, BeginString))
{
line = line.Substring(BeginString.Length);
int index = line.IndexOf('-');
if (index > 0 && Platform.EndsWith(line, "-----") && (line.Length - index) == 5)
{
string type = line.Substring(0, index);
return LoadObject(type);
}
}
return null;
}
private PemObject LoadObject(string type)
{
string endMarker = EndString + type;
IList headers = Platform.CreateArrayList();
StringBuilder buf = new StringBuilder();
string line;
while ((line = reader.ReadLine()) != null
&& Platform.IndexOf(line, endMarker) == -1)
{
int colonPos = line.IndexOf(':');
if (colonPos == -1)
{
buf.Append(line.Trim());
}
else
{
// Process field
string fieldName = line.Substring(0, colonPos).Trim();
if (Platform.StartsWith(fieldName, "X-"))
{
fieldName = fieldName.Substring(2);
}
string fieldValue = line.Substring(colonPos + 1).Trim();
headers.Add(new PemHeader(fieldName, fieldValue));
}
}
if (line == null)
{
throw new IOException(endMarker + " not found");
}
if (buf.Length % 4 != 0)
{
throw new IOException("base64 data appears to be truncated");
}
return new PemObject(type, headers, Base64.Decode(buf.ToString()));
}
}
}
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