/*
 * Copyright (c) 2023 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@dragonflybsd.org>
 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include "hammer2.h"
#include "lz4/hammer2_lz4.h"
#include "zlib/hammer2_zlib.h"

#define DEBUFSIZE       HAMMER2_PBUFSIZE

static char OutBuf[DEBUFSIZE + 128];    /* allow for some overflow */

void *
hammer2_decompress_LZ4(void *inbuf, size_t insize, size_t outsize,
                       int *statusp)
{
        int result;
        int cinsize;

        assert(outsize <= DEBUFSIZE);
        *statusp = 0;

        cinsize = *(const int *)inbuf;
        if (cinsize > (int)insize) {
                printf("FAIL1\n");
                bzero(OutBuf, outsize);
                return OutBuf;
        }

        result = LZ4_decompress_safe((char *)inbuf + 4, OutBuf,
                                     cinsize, outsize);
        if (result < 0) {
                bzero(OutBuf, outsize);
        } else {
                *statusp = 1;
                if (result < (int)outsize)
                        bzero(OutBuf + result, outsize - result);
        }
        if (result < 0)
                printf("LZ4 decompression failure\n");

        return OutBuf;
}

void *
hammer2_decompress_ZLIB(void *inbuf, size_t insize, size_t outsize,
                        int *statusp)
{
        z_stream strm_decompress;
        int ret;

        assert(outsize <= DEBUFSIZE);
        *statusp = 0;

        bzero(&strm_decompress, sizeof(strm_decompress));
        strm_decompress.avail_in = 0;
        strm_decompress.next_in = Z_NULL;
        ret = inflateInit(&strm_decompress);

        if (ret != Z_OK) {
                bzero(OutBuf, outsize);
                printf("ZLIB1 decompression failure\n");
        } else {
                strm_decompress.next_in = inbuf;
                strm_decompress.next_out = OutBuf;
                strm_decompress.avail_in = insize;
                strm_decompress.avail_out = outsize;
                ret = inflate(&strm_decompress, Z_FINISH);
                if (ret != Z_STREAM_END) {
                        bzero(OutBuf, outsize);
                        printf("ZLIB2 decompression failure\n");
                } else {
                        ret = outsize - strm_decompress.avail_out;
                        if (ret < (int)outsize)
                                bzero(OutBuf + ret, strm_decompress.avail_out);
                        *statusp = 1;
                }
                ret = inflateEnd(&strm_decompress);
        }
        return OutBuf;
}