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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.mime;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.util.Strings;

/**
 * Read regular text lines, allowing for a single character look ahead.
 */
class LineReader
{
    private final InputStream src;

    private int lastC = -1;

    LineReader(InputStream src)
    {
        this.src = src;
    }

    String readLine()
        throws IOException
    {
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        int ch;

        if (lastC != -1)
        {
            if (lastC == '\r')   // to get this we must have '\r\r' so blank line
            {
                return "";
            }
            ch = lastC;
            lastC = -1;
        }
        else
        {
            ch = src.read();
        }

        while (ch >= 0 && ch != '\r' && ch != '\n')
        {
            bOut.write(ch);
            ch = src.read();
        }

        if (ch == '\r')
        {
            int c = src.read();
            if (c != '\n' && c >= 0)
            {
                lastC = c;
            }
        }

        if (ch < 0)
        {
            return null;
        }

        return Strings.fromUTF8ByteArray(bOut.toByteArray());
    }
}