121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
#include <stdio.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include "zlib.h"
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#define CHECK_ERR(err, msg) { \
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if (err != Z_OK) { \
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fprintf(stderr, "%s error: %d\n", msg, err); \
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exit(1); \
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} \
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}
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static const uint8_t *data;
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static size_t dataLen;
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static alloc_func zalloc = NULL;
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static free_func zfree = NULL;
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/* ===========================================================================
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* Test deflate() with full flush
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*/
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void test_flush(unsigned char *compr, z_size_t *comprLen) {
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z_stream c_stream; /* compression stream */
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int err;
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unsigned int len = dataLen;
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c_stream.zalloc = zalloc;
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c_stream.zfree = zfree;
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c_stream.opaque = (void *)0;
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err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
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CHECK_ERR(err, "deflateInit");
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c_stream.next_in = (Bytef *)data;
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c_stream.next_out = compr;
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c_stream.avail_in = 3;
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c_stream.avail_out = (unsigned int)*comprLen;
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err = deflate(&c_stream, Z_FULL_FLUSH);
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CHECK_ERR(err, "deflate flush 1");
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compr[3]++; /* force an error in first compressed block */
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c_stream.avail_in = len - 3;
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err = deflate(&c_stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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CHECK_ERR(err, "deflate flush 2");
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}
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err = deflateEnd(&c_stream);
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CHECK_ERR(err, "deflateEnd");
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*comprLen = (z_size_t)c_stream.total_out;
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}
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/* ===========================================================================
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* Test inflateSync()
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*/
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void test_sync(unsigned char *compr, size_t comprLen, unsigned char *uncompr,
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size_t uncomprLen) {
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int err;
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z_stream d_stream; /* decompression stream */
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d_stream.zalloc = zalloc;
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d_stream.zfree = zfree;
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d_stream.opaque = (void *)0;
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d_stream.next_in = compr;
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d_stream.avail_in = 2; /* just read the zlib header */
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err = inflateInit(&d_stream);
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CHECK_ERR(err, "inflateInit");
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d_stream.next_out = uncompr;
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d_stream.avail_out = (unsigned int)uncomprLen;
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err = inflate(&d_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "inflate");
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d_stream.avail_in = (unsigned int)comprLen - 2; /* read all compressed data */
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err = inflateSync(&d_stream); /* but skip the damaged part */
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CHECK_ERR(err, "inflateSync");
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err = inflate(&d_stream, Z_FINISH);
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if (err != Z_DATA_ERROR) {
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fprintf(stderr, "inflate should report DATA_ERROR\n");
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/* Because of incorrect adler32 */
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exit(1);
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}
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err = inflateEnd(&d_stream);
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CHECK_ERR(err, "inflateEnd");
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}
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int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size) {
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size_t comprLen = 100 + 2 * compressBound(size);
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size_t uncomprLen = size;
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uint8_t *compr, *uncompr;
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/* Discard inputs larger than 1Mb. */
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static size_t kMaxSize = 1024 * 1024;
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// This test requires at least 3 bytes of input data.
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if (size <= 3 || size > kMaxSize)
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return 0;
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data = d;
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dataLen = size;
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compr = (uint8_t *)calloc(1, comprLen);
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uncompr = (uint8_t *)calloc(1, uncomprLen);
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test_flush(compr, &comprLen);
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test_sync(compr, comprLen, uncompr, uncomprLen);
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free(compr);
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free(uncompr);
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/* This function must return 0. */
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return 0;
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}
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