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75 lines
2.4 KiB
75 lines
2.4 KiB
// Copyright 2020 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "third_party/zlib/zlib.h"
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// Fuzzer builds often have NDEBUG set, so roll our own assert macro.
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#define ASSERT(cond) \
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do { \
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if (!(cond)) { \
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fprintf(stderr, "%s:%d Assert failed: %s\n", __FILE__, __LINE__, #cond); \
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exit(1); \
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} \
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} while (0)
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// Entry point for LibFuzzer.
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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// Deflate data.
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z_stream comp_strm;
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comp_strm.zalloc = Z_NULL;
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comp_strm.zfree = Z_NULL;
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comp_strm.opaque = Z_NULL;
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int ret = deflateInit(&comp_strm, Z_DEFAULT_COMPRESSION);
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ASSERT(ret == Z_OK);
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size_t comp_buf_cap = deflateBound(&comp_strm, size);
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uint8_t* comp_buf = (uint8_t*)malloc(comp_buf_cap);
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ASSERT(comp_buf != nullptr);
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comp_strm.next_out = comp_buf;
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comp_strm.avail_out = comp_buf_cap;
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comp_strm.next_in = (unsigned char*)data;
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comp_strm.avail_in = size;
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ret = deflate(&comp_strm, Z_FINISH);
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ASSERT(ret == Z_STREAM_END);
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size_t comp_sz = comp_buf_cap - comp_strm.avail_out;
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// Inflate comp_buf one chunk at a time.
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z_stream decomp_strm;
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decomp_strm.zalloc = Z_NULL;
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decomp_strm.zfree = Z_NULL;
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decomp_strm.opaque = Z_NULL;
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ret = inflateInit(&decomp_strm);
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ASSERT(ret == Z_OK);
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decomp_strm.next_in = comp_buf;
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decomp_strm.avail_in = comp_sz;
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while (decomp_strm.avail_in > 0) {
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uint8_t decomp_buf[1024];
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decomp_strm.next_out = decomp_buf;
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decomp_strm.avail_out = sizeof(decomp_buf);
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ret = inflate(&decomp_strm, Z_FINISH);
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ASSERT(ret == Z_OK || ret == Z_STREAM_END || ret == Z_BUF_ERROR);
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// Verify the output bytes.
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size_t num_out = sizeof(decomp_buf) - decomp_strm.avail_out;
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for (size_t i = 0; i < num_out; i++) {
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ASSERT(decomp_buf[i] == data[decomp_strm.total_out - num_out + i]);
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}
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}
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ret = deflateEnd(&comp_strm);
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ASSERT(ret == Z_OK);
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free(comp_buf);
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inflateEnd(&decomp_strm);
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ASSERT(ret == Z_OK);
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return 0;
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}
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