// SPDX-License-Identifier: 0BSD

///////////////////////////////////////////////////////////////////////////////

//

/// \file       fuzz_decode_stream.c

/// \brief      Fuzz test program for single threaded .xz decoding

//

//  Authors:    Lasse Collin

//              Maksym Vatsyk

//

///////////////////////////////////////////////////////////////////////////////

#include <inttypes.h>

#include <stdlib.h>

#include <stdio.h>

#include "lzma.h"

#include "fuzz_common.h"

extern int

LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size)

{

  lzma_stream strm = LZMA_STREAM_INIT;

  // Initialize a .xz decoder using the memory usage limit

  // defined in fuzz_common.h

  //

  // Enable support for concatenated .xz files which is used when

  // decompressing regular .xz files (instead of data embedded inside

  // some other file format). Integrity checks on the uncompressed

  // data are ignored to make fuzzing more effective (incorrect check

  // values won't prevent the decoder from processing more input).

  //

  // The flag LZMA_IGNORE_CHECK doesn't disable verification of

  // header CRC32 values. Those checks are disabled when liblzma is

  // built with the #define FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION.

  lzma_ret ret = lzma_stream_decoder(&strm, MEM_LIMIT,

      LZMA_CONCATENATED | LZMA_IGNORE_CHECK);

  if (ret != LZMA_OK) {

    // This should never happen unless the system has

    // no free memory or address space to allow the small

    // allocations that the initialization requires.

    fprintf(stderr, "lzma_stream_decoder() failed (%d)\n", ret);

    abort();

  }

  fuzz_code(&strm, inbuf, inbuf_size);

  // Free the allocated memory.

  lzma_end(&strm);

  return 0;

}