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package org.spongycastle.util.io.pem;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import org.spongycastle.util.encoders.Base64;
/**
* A generic PEM reader, based on the format outlined in RFC 1421
*/
public class PemReader
extends BufferedReader
{
private static final String BEGIN = "-----BEGIN ";
private static final String END = "-----END ";
public PemReader(Reader reader)
{
super(reader);
}
public PemObject readPemObject()
throws IOException
{
String line = readLine();
while (line != null && !line.startsWith(BEGIN))
{
line = readLine();
}
if (line != null)
{
line = line.substring(BEGIN.length());
int index = line.indexOf('-');
String type = line.substring(0, index);
if (index > 0)
{
return loadObject(type);
}
}
return null;
}
private PemObject loadObject(String type)
throws IOException
{
String line;
String endMarker = END + type;
StringBuffer buf = new StringBuffer();
List headers = new ArrayList();
while ((line = readLine()) != null)
{
if (line.indexOf(":") >= 0)
{
int index = line.indexOf(':');
String hdr = line.substring(0, index);
String value = line.substring(index + 1).trim();
headers.add(new PemHeader(hdr, value));
continue;
}
if (line.indexOf(endMarker) != -1)
{
break;
}
buf.append(line.trim());
}
if (line == null)
{
throw new IOException(endMarker + " not found");
}
return new PemObject(type, headers, Base64.decode(buf.toString()));
}
}
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