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package com.openexchange.ajp13;

/**
 * {@link AJPv13Utility} - Provides some utility methods for AJP processing
 * 
 * @author <a href="mailto:thorben.betten@open-xchange.com">Thorben Betten</a>
 */
public final class AJPv13Utility {

    /**
     * Initializes a new {@link AJPv13Utility}
     */
    private AJPv13Utility() {
        super();
    }

    /**
     * Dumps given AJP package's bytes
     * 
     * @param bytes The AJP package's bytes
     * @return A string representing formatted AJP package's bytes for logging purpose
     */
    public static String dumpBytes(final byte[] bytes) {
        if (bytes == null || bytes.length == 0) {
            return "";
        }
        final String space = "    ";
        final StringBuilder sb = new StringBuilder(1024);
        int c = 0;
        int l = 0;
        for (final byte b : bytes) {
            if (c % 16 == 0) {
                sb.append('\r').append('\n');
                c = 0;
                final String hex = Integer.toHexString(l).toUpperCase();
                l += 16;
                final int nOZ = 4 - hex.length();
                for (int i = 0; i < nOZ; i++) {
                    sb.append('0');
                }
                sb.append(hex).append(space);
            } else {
                sb.append(' ');
            }
            final String s = Integer.toHexString(b & 0xff).toUpperCase();
            if (s.length() == 1) {
                sb.append('0');
            }
            sb.append(s);
            c++;
        }
        return sb.toString();
    }

    /**
     * Dumps given AJP package's bytes
     * 
     * @param magic1 The first magic byte
     * @param magic2 The second magic byte
     * @param bytes The remaining AJP package's bytes
     * @return A string representing formatted AJP package's bytes for logging purpose
     */
    public static String dumpBytes(final byte magic1, final byte magic2, final byte[] bytes) {
        if (bytes == null) {
            return "";
        }
        final String space = "    ";
        final StringBuilder sb = new StringBuilder(1024);
        sb.append("0000").append(space).append(Integer.toHexString(magic1).toUpperCase()).append(' ').append(
            Integer.toHexString(magic2).toUpperCase());
        int c = 2;
        int l = 0;
        for (final byte b : bytes) {
            if (c == 16) {
                sb.append('\r').append('\n');
                c = 0;
                l += 16;
                final String hex = Integer.toHexString(l).toUpperCase();
                final int nOZ = 4 - hex.length();
                for (int i = 0; i < nOZ; i++) {
                    sb.append('0');
                }
                sb.append(hex).append(space);
            } else {
                sb.append(' ');
            }
            final String s = Integer.toHexString(b & 0xff).toUpperCase();
            if (s.length() == 1) {
                sb.append('0');
            }
            sb.append(s);
            c++;
        }
        return sb.toString();
    }

    /**
     * Dumps specified byte.
     * 
     * @param b The byte
     * @return A string representing the byte
     */
    public static String dumpByte(final byte b) {
        final String s = Integer.toHexString(b & 0xff).toUpperCase();
        final StringBuilder sb = new StringBuilder(4).append("0x");
        if (s.length() == 1) {
            sb.append('0');
        }
        sb.append(s);
        return sb.toString();
    }

    /**
     * Parses specified bytes' <code>int</code> value.
     * 
     * @return The <code>int</code> value
     */
    public static int parseInt(final byte higher, final byte lower) {
        return ((higher & 0xff) << 8) + (lower & 0xff);
    }
}
