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using System;
using System.IO;
using System.Text;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.X509
{
class PemParser
{
private readonly string _header1;
private readonly string _header2;
private readonly string _footer1;
private readonly string _footer2;
internal PemParser(
string type)
{
_header1 = "-----BEGIN " + type + "-----";
_header2 = "-----BEGIN X509 " + type + "-----";
_footer1 = "-----END " + type + "-----";
_footer2 = "-----END X509 " + type + "-----";
}
private string ReadLine(
Stream inStream)
{
int c;
StringBuilder l = new StringBuilder();
do
{
while (((c = inStream.ReadByte()) != '\r') && c != '\n' && (c >= 0))
{
if (c == '\r')
{
continue;
}
l.Append((char)c);
}
}
while (c >= 0 && l.Length == 0);
if (c < 0)
{
return null;
}
return l.ToString();
}
internal Asn1Sequence ReadPemObject(
Stream inStream)
{
string line;
StringBuilder pemBuf = new StringBuilder();
while ((line = ReadLine(inStream)) != null)
{
if (Platform.StartsWith(line, _header1) || Platform.StartsWith(line, _header2))
{
break;
}
}
while ((line = ReadLine(inStream)) != null)
{
if (Platform.StartsWith(line, _footer1) || Platform.StartsWith(line, _footer2))
{
break;
}
pemBuf.Append(line);
}
if (pemBuf.Length != 0)
{
Asn1Object o = Asn1Object.FromByteArray(Base64.Decode(pemBuf.ToString()));
if (!(o is Asn1Sequence))
{
throw new IOException("malformed PEM data encountered");
}
return (Asn1Sequence) o;
}
return null;
}
}
}
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