1 /*
2 # Copyright 2018 Google Inc.
3 #
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
7 #
8 # http://www.apache.org/licenses/LICENSE-2.0
9 #
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
15 #
16 ################################################################################
17 */
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <stdint.h>
22 #include <stdbool.h>
23 #include <assert.h>
24 #include "lzo1b.h"
25 #include "lzo1c.h"
26 #include "lzo1f.h"
27 #include "lzo1x.h"
28 #include "lzo1y.h"
29 #include "lzo1z.h"
30 #include "lzo2a.h"
31
32 typedef int (*decompress_function)( const lzo_bytep, lzo_uint ,
33 lzo_bytep, lzo_uintp,
34 lzo_voidp );
35
36 #define NUM_DECOMP 7
37
38 static decompress_function funcArr[NUM_DECOMP] =
39 {
40 &lzo1b_decompress_safe,
41 &lzo1c_decompress_safe,
42 &lzo1f_decompress_safe,
43 &lzo1x_decompress_safe,
44 &lzo1y_decompress_safe,
45 &lzo1z_decompress_safe,
46 &lzo2a_decompress_safe
47 };
48
49 /* lzo (de)compresses data in blocks. Block size is the
50 * size of one such block. This size has a default value of 256KB.
51 */
52 static const size_t bufSize = 256 * 1024L;
53
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)54 extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
55 {
56 int r;
57 lzo_uint new_len;
58 if (size < 1){
59 return 0;
60 }
61 /* Buffer into which compressed data provided by the fuzzer
62 * is going to be decompressed. The buffer size is chosen
63 * to be equal to the default block size (256KB) for
64 * (de)compression.
65 */
66 unsigned char __LZO_MMODEL out[bufSize];
67
68 static bool isInit = false;
69 if (!isInit)
70 {
71 if (lzo_init() != LZO_E_OK)
72 {
73 #ifdef __DEBUG__
74 printf("internal error - lzo_init() failed !!!\n");
75 #endif
76 return 0;
77 }
78 isInit = true;
79 }
80
81 // Decompress.
82 int idx = size % NUM_DECOMP;
83 new_len = bufSize;
84 // Work memory not necessary for decompression
85 r = (*funcArr[idx])(data, size, out, &new_len, /*wrkmem=*/NULL);
86 #ifdef __DEBUG__
87 if (r != LZO_E_OK)
88 {
89 printf("error thrown by lzo1x_decompress_safe: %d\n", r);
90 }
91 printf("decompressed %lu bytes back into %lu bytes\n",
92 (unsigned long) size, (unsigned long) new_len);
93 #endif
94 return 0;
95 }
96