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#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <inttypes.h>
#include "zbuild.h"
#ifdef ZLIB_COMPAT
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
#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) {
PREFIX3(stream) c_stream; /* compression stream */
int err;
c_stream.zalloc = zalloc;
c_stream.zfree = zfree;
c_stream.opaque = (void *)0;
err = PREFIX(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 = PREFIX(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 and switch to no compression: */
PREFIX(deflateParams)(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
c_stream.next_in = compr;
diff = (unsigned int)(c_stream.next_out - compr);
c_stream.avail_in = diff;
err = PREFIX(deflate)(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate large 2");
/* Switch back to compressing mode: */
PREFIX(deflateParams)(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
c_stream.next_in = uncompr;
c_stream.avail_in = (unsigned int)uncomprLen;
err = PREFIX(deflate)(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate large 3");
err = PREFIX(deflate)(&c_stream, Z_FINISH);
if (err != Z_STREAM_END) {
fprintf(stderr, "deflate large should report Z_STREAM_END\n");
exit(1);
}
err = PREFIX(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;
PREFIX3(stream) d_stream; /* decompression stream */
d_stream.zalloc = zalloc;
d_stream.zfree = zfree;
d_stream.opaque = (void *)0;
d_stream.next_in = compr;
d_stream.avail_in = (unsigned int)comprLen;
err = PREFIX(inflateInit)(&d_stream);
CHECK_ERR(err, "inflateInit");
for (;;) {
d_stream.next_out = uncompr; /* discard the output */
d_stream.avail_out = (unsigned int)uncomprLen;
err = PREFIX(inflate)(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END)
break;
CHECK_ERR(err, "large inflate");
}
err = PREFIX(inflateEnd)(&d_stream);
CHECK_ERR(err, "inflateEnd");
if (d_stream.total_out != 2 * uncomprLen + diff) {
fprintf(stderr, "bad large inflate: %" PRIu64 "\n", (uint64_t)d_stream.total_out);
exit(1);
}
}
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 = (uint8_t *)calloc(1, comprLen);
uncompr = (uint8_t *)calloc(1, uncomprLen);
test_large_deflate(compr, comprLen, uncompr, uncomprLen);
test_large_inflate(compr, comprLen, uncompr, uncomprLen);
free(compr);
free(uncompr);
/* This function must return 0. */
return 0;
}
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