mirror of https://github.com/google/oss-fuzz.git
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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/*
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# Copyright 2018 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include "lzo1x.h"
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/* Work-memory needed for compression. Allocate memory in units
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* of 'lzo_align_t' (instead of 'char') to make sure it is properly aligned.
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*/
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#define HEAP_ALLOC(var,size) \
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lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
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static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS);
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extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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int r;
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lzo_uint out_len;
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lzo_uint new_len;
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/* We want to compress the data block at 'in' with length 'IN_LEN' to
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* the block at 'out'. Because the input block may be incompressible,
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* we must provide a little more output space in case that compression
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* is not possible.
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*/
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unsigned char __LZO_MMODEL in[size];
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unsigned char __LZO_MMODEL out[size + size/16 + 64 + 3];
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static bool isInit = false;
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if (!isInit)
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{
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if (lzo_init() != LZO_E_OK)
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{
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#ifdef __DEBUG__
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printf("internal error - lzo_init() failed !!!\n");
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#endif
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return 0;
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}
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isInit = true;
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}
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/* Compress with LZO1X-1. */
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r = lzo1x_1_compress(data, size, out, &out_len, wrkmem);
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assert(r == LZO_E_OK);
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#ifdef __DEBUG__
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printf("compressed %lu bytes into %lu bytes\n",
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(unsigned long) size, (unsigned long) out_len);
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#endif
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/* check for an incompressible block */
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if (out_len >= size)
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{
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#ifdef __DEBUG__
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printf("This block contains incompressible data.\n");
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#endif
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return 0;
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}
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// Decompress
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new_len = size;
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r = lzo1x_decompress(out, out_len, in, &new_len,/*wrkmem=*/NULL);
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assert(r == LZO_E_OK && new_len == size);
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#ifdef __DEBUG__
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printf("decompressed %lu bytes back into %lu bytes\n",
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(unsigned long) out_len, (unsigned long) size);
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#endif
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return 0;
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}
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