117 lines
5.2 KiB
C
117 lines
5.2 KiB
C
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/*
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* Copyright (c) Yann Collet, Meta Platforms, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef EXAMPLE_SEQ_PROD_H
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#define EXAMPLE_SEQ_PROD_H
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#define ZSTD_STATIC_LINKING_ONLY
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#include "zstd.h"
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* *** INTERFACE FOR FUZZING THIRD-PARTY SEQUENCE PRODUCER PLUGINS ***
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* Fuzz-testing for the external sequence producer API was introduced in PR #3437.
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* However, the setup in #3437 only allows fuzzers to exercise the implementation of the
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* API itself (the code in the core zstd library which interacts with your plugin).
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*
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* This header defines an interface for plugin authors to link their code into the fuzzer
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* build. Plugin authors can provide an object file implementing the symbols below,
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* and those symbols will replace the default ones provided by #3437.
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*
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* To fuzz your plugin, follow these steps:
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* - Build your object file with a recent version of clang. Building with gcc is not supported.
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* - Build your object file using appropriate flags for fuzzing. For example:
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* `-g -fno-omit-frame-pointer -fsanitize=undefined,address,fuzzer`
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* - Build the fuzzer binaries with options corresponding to the flags you chose. Use --custom-seq-prod= to pass in your object file:
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* `./fuzz.py build all --enable-fuzzer --enable-asan --enable-ubsan --cc clang --cxx clang++ --custom-seq-prod=your_object.o`
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*
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* An example implementation of this header is provided at tests/fuzz/seq_prod_fuzz_example/.
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* Use these commands to fuzz with the example code:
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* $ make corpora
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* $ make -C seq_prod_fuzz_example/
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* $ python3 ./fuzz.py build all --enable-fuzzer --enable-asan --enable-ubsan --cc clang --cxx clang++ --custom-seq-prod=seq_prod_fuzz_example/example_seq_prod.o
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* $ python3 ./fuzz.py libfuzzer simple_round_trip
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*/
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/* The fuzzer will call this function before each test-case. It should run any
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* setup actions (such as starting a hardware device) needed for fuzzing.
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*
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* The fuzzer will assert() that the return value is zero. To signal an error,
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* please return a non-zero value. */
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size_t FUZZ_seqProdSetup(void);
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/* The fuzzer will call this function after each test-case. It should free
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* resources aquired by FUZZ_seqProdSetup() to prevent leaks across test-cases.
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*
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* The fuzzer will assert() that the return value is zero. To signal an error,
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* please return a non-zero value. */
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size_t FUZZ_seqProdTearDown(void);
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/* The fuzzer will call this function before each test-case, only after calling
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* FUZZ_seqProdSetup(), to obtain a sequence producer state which can be passed
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* into ZSTD_registerSequenceProducer().
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*
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* All compressions which are part of a test-case will share a single sequence
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* producer state. Sharing the state object is safe because the fuzzers currently
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* don't exercise the sequence producer API in multi-threaded scenarios. We may
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* need a new approach in the future to support multi-threaded fuzzing.
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*
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* The fuzzer will assert() that the return value is not NULL. To signal an error,
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* please return NULL. */
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void* FUZZ_createSeqProdState(void);
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/* The fuzzer will call this function after each test-case. It should free any
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* resources aquired by FUZZ_createSeqProdState().
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*
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* The fuzzer will assert() that the return value is zero. To signal an error,
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* please return a non-zero value. */
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size_t FUZZ_freeSeqProdState(void* sequenceProducerState);
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/* This is the sequence producer function you would like to fuzz! It will receive
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* the void* returned by FUZZ_createSeqProdState() on each invocation. */
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size_t FUZZ_thirdPartySeqProd(void* sequenceProducerState,
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ZSTD_Sequence* outSeqs, size_t outSeqsCapacity,
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const void* src, size_t srcSize,
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const void* dict, size_t dictSize,
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int compressionLevel,
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size_t windowSize);
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/* These macros are internal helpers. You do not need to worry about them. */
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#ifdef FUZZ_THIRD_PARTY_SEQ_PROD
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#define FUZZ_SEQ_PROD_SETUP() \
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do { \
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FUZZ_ASSERT(FUZZ_seqProdSetup() == 0); \
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FUZZ_seqProdState = FUZZ_createSeqProdState(); \
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FUZZ_ASSERT(FUZZ_seqProdState != NULL); \
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} while (0)
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#else
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#define FUZZ_SEQ_PROD_SETUP()
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#endif
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#ifdef FUZZ_THIRD_PARTY_SEQ_PROD
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#define FUZZ_SEQ_PROD_TEARDOWN() \
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do { \
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FUZZ_ASSERT(FUZZ_freeSeqProdState(FUZZ_seqProdState) == 0); \
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FUZZ_ASSERT(FUZZ_seqProdTearDown() == 0); \
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} while (0)
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#else
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#define FUZZ_SEQ_PROD_TEARDOWN()
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXAMPLE_SEQ_PROD_H */
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