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/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

package io.soluble.pjb.bridge;

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

/**
 * numbers are base 16
 */
class HexOutputBuffer extends ByteArrayOutputStream {
    /**
     *
     */
    private final JavaBridge bridge;

    HexOutputBuffer(JavaBridge bridge) {
        this.bridge = bridge;
    }

    /*
     * Return up to 256 bytes. Useful for logging.
     */
    protected byte[] getFirstBytes() {
        int c = super.count;
        byte[] append = (c > 256) ? Response.append_for_OutBuf_getFirstBytes : Response.append_none_for_OutBuf_getFirstBytes;
        if (c > 256) c = 256;
        byte[] ret = new byte[c + append.length];
        System.arraycopy(super.buf, 0, ret, 0, c);
        System.arraycopy(append, 0, ret, ret.length - append.length, append.length);
        return ret;
    }

    protected void append(byte[] s) {
        try {
            write(s);
        } catch (IOException e) {/*not possible*/}
    }

    protected void appendQuoted(byte[] s) {
        for (int i = 0; i < s.length; i++) {
            byte ch;
            switch (ch = s[i]) {
                case '&':
                    append(Response.amp);
                    break;
                case '\"':
                    append(Response.quote);
                    break;
                default:
                    write(ch);
            }
        }
    }

    protected void appendQuoted(String s) {
        appendQuoted(bridge.options.getBytes(s));
    }

    private byte[] buf = new byte[16];

    /**
     * append an unsigned long number
     */
    protected void append(long i) {
        int pos = 16;
        do {
            buf[--pos] = Util.HEX_DIGITS[(int) (i & 0xF)];
            i >>>= 4;
        } while (i != 0);
        write(buf, pos, 16 - pos);
    }

    /**
     * append a double value, base 10 for now (not every C compiler supports the C99 "a" conversion)
     */
    protected void append(double d) {
        append(Double.toString(d).getBytes());
    }

    /**
     * append a long number
     */
    protected void appendLong(long l) {
        append(Response.L);
        if (l < 0) {
            append(-l);
            append(Response.pa);
        } else {
            append(l);
            append(Response.po);
        }
    }

    /**
     * append a string
     */
    protected void appendString(byte s[]) {
        append(Response.S);
        appendQuoted(s);
    }
}