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Copy pathlarge_fuzzer.c
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130 lines (103 loc) · 3.22 KB
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/* Derived from zlib fuzzers at http://github.com/google/oss-fuzz/tree/master/projects/zlib,
* see ossfuzz.sh for full license text.
*/
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include "miniz.h"
#define CHECK_ERR(err, msg) { \
if (err != Z_OK) { \
fprintf(stderr, "%s error: %d\n", msg, err); \
exit(1); \
} \
}
static const uint8_t *data;
static size_t dataLen;
static alloc_func zalloc = NULL;
static free_func zfree = NULL;
static unsigned int diff;
/* Test deflate() with large buffers and dynamic change of compression level */
void test_large_deflate(unsigned char *compr, size_t comprLen,
unsigned char *uncompr, size_t uncomprLen)
{
z_stream c_stream; /* compression stream */
int err;
c_stream.zalloc = zalloc;
c_stream.zfree = zfree;
c_stream.opaque = NULL;
err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
CHECK_ERR(err, "deflateInit");
c_stream.next_out = compr;
c_stream.avail_out = (unsigned int)comprLen;
/* At this point, uncompr is still mostly zeroes, so it should compress
* very well:
*/
c_stream.next_in = uncompr;
c_stream.avail_in = (unsigned int)uncomprLen;
err = deflate(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate large 1");
if (c_stream.avail_in != 0)
{
fprintf(stderr, "deflate not greedy\n");
exit(1);
}
/* Feed in already compressed data: */
c_stream.next_in = compr;
diff = (unsigned int)(c_stream.next_out - compr);
c_stream.avail_in = diff;
deflate(&c_stream, Z_NO_FLUSH);
err = deflate(&c_stream, Z_FINISH);
if (err != Z_STREAM_END)
{
fprintf(stderr, "deflate large should report Z_STREAM_END\n");
exit(1);
}
err = deflateEnd(&c_stream);
CHECK_ERR(err, "deflateEnd");
}
/* Test inflate() with large buffers */
void test_large_inflate(unsigned char *compr, size_t comprLen,
unsigned char *uncompr, size_t uncomprLen)
{
int err;
z_stream d_stream; /* decompression stream */
d_stream.zalloc = zalloc;
d_stream.zfree = zfree;
d_stream.opaque = NULL;
d_stream.next_in = compr;
d_stream.avail_in = (unsigned int)comprLen;
err = inflateInit(&d_stream);
CHECK_ERR(err, "inflateInit");
for (;;)
{
d_stream.next_out = uncompr; /* discard the output */
d_stream.avail_out = (unsigned int)uncomprLen;
err = inflate(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END) break;
CHECK_ERR(err, "large inflate");
}
err = inflateEnd(&d_stream);
CHECK_ERR(err, "inflateEnd");
}
int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size)
{
size_t comprLen = 100 + 3 * size;
size_t uncomprLen = comprLen;
uint8_t *compr, *uncompr;
/* Discard inputs larger than 512Kb. */
static size_t kMaxSize = 512 * 1024;
if (size < 1 || size > kMaxSize)
return 0;
data = d;
dataLen = size;
compr = calloc(1, comprLen);
uncompr = calloc(1, uncomprLen);
test_large_deflate(compr, comprLen, uncompr, uncomprLen);
test_large_inflate(compr, comprLen, uncompr, uncomprLen);
free(compr);
free(uncompr);
return 0;
}