/*

# 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 <assert.h>

#include <stdbool.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include "lzo1b.h"

#include "lzo1c.h"

#include "lzo1f.h"

#include "lzo1x.h"

#include "lzo1y.h"

#include "lzo1z.h"

#include "lzo2a.h"

#include "lzoconf.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 kBufSize = 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 buf = malloc(kBufSize);

  if (!buf) {

    // OOM here is out of scope.

    return 0;

  }

  static bool isInit = false;

  if (!isInit) {

    if (lzo_init() != LZO_E_OK) {

#ifdef __DEBUG__

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

#endif

      free(buf);

      return 0;

    }

    isInit = true;

  }

  // Decompress.

  int idx = size % NUM_DECOMP;

  new_len = kBufSize;

  // Work memory not necessary for decompression

  r = (*funcArr[idx])(data, size, buf, &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

  free(buf);

  return 0;

}