/*

# Copyright 2018 Google Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

#

################################################################################

*/

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <stdbool.h>

#include <assert.h>

#include "lzo1b.h"

#include "lzo1c.h"

#include "lzo1f.h"

#include "lzo1x.h"

#include "lzo1y.h"

#include "lzo1z.h"

#include "lzo2a.h"

typedef int (*decompress_function)( const lzo_bytep, lzo_uint  ,

                                lzo_bytep, lzo_uintp,

                                lzo_voidp  );

#define NUM_DECOMP   7

static decompress_function funcArr[NUM_DECOMP] =

{

        &lzo1b_decompress_safe,

        &lzo1c_decompress_safe,

        &lzo1f_decompress_safe,

        &lzo1x_decompress_safe,

        &lzo1y_decompress_safe,

        &lzo1z_decompress_safe,

        &lzo2a_decompress_safe

};

/* lzo (de)compresses data in blocks. Block size is the

 * size of one such block. This size has a default value of 256KB.

 */

static const size_t bufSize = 256 * 1024L;

extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    int r;

    lzo_uint new_len;

    if (size < 1){

        return 0;

    }

    /* Buffer into which compressed data provided by the fuzzer

     * is going to be decompressed. The buffer size is chosen

     * to be equal to the default block size (256KB) for

     * (de)compression.

     */

    unsigned char __LZO_MMODEL out[bufSize];

    static bool isInit = false;

    if (!isInit)

    {

        if (lzo_init() != LZO_E_OK)

        {

#ifdef __DEBUG__

            printf("internal error - lzo_init() failed !!!\n");

#endif

            return 0;

        }

        isInit = true;

    }

    // Decompress.

    int idx = size % NUM_DECOMP;

    new_len = bufSize;

    // Work memory not necessary for decompression

    r = (*funcArr[idx])(data, size, out, &new_len, /*wrkmem=*/NULL);

#ifdef __DEBUG__

    if (r != LZO_E_OK)

    {

        printf("error thrown by lzo1x_decompress_safe: %d\n", r);

    }

    printf("decompressed %lu bytes back into %lu bytes\n",

            (unsigned long) size, (unsigned long) new_len);

#endif

    return 0;

}