org.bouncycastle.mime.LineReader Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk15on Show documentation

The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 11. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

There is a newer version: 1.70

Show newest version

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());
    }
}