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/*
# 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 "lzo1x.h"
/* Work-memory needed for compression. Allocate memory in units
* of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned.
*/
#define HEAP_ALLOC(var,size) \
lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS);
extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
int r;
lzo_uint out_len;
lzo_uint new_len;
/* We want to compress the data block at 'in' with length 'IN_LEN' to
* the block at 'out'. Because the input block may be incompressible,
* we must provide a little more output space in case that compression
* is not possible.
*/
unsigned char __LZO_MMODEL in[size > 0 ? size : 1];
unsigned char __LZO_MMODEL out[size + size/16 + 64 + 3];
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;
}
/* Compress with LZO1X-1. */
r = lzo1x_1_compress(data, size, out, &out_len, wrkmem);
assert(r == LZO_E_OK);
#ifdef __DEBUG__
printf("compressed %lu bytes into %lu bytes\n",
(unsigned long) size, (unsigned long) out_len);
#endif
/* check for an incompressible block */
if (out_len >= size)
{
#ifdef __DEBUG__
printf("This block contains incompressible data.\n");
#endif
return 0;
}
// Decompress
new_len = size;
r = lzo1x_decompress(out, out_len, in, &new_len,/*wrkmem=*/NULL);
assert(r == LZO_E_OK && new_len == size);
#ifdef __DEBUG__
printf("decompressed %lu bytes back into %lu bytes\n",
(unsigned long) out_len, (unsigned long) size);
#endif
return 0;
}
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