Test to re-produce https://github.com/MeteoGroup/jbrotli/issues/2

jbrotli_issue_2_crash_inside_brotli.cc

/**
 * Test to re-produce https://github.com/MeteoGroup/jbrotli/issues/2
 */

#include <fcntl.h>
#include <string>
#include "../enc/compressor.h"

int main(int argc, char **argv) {
  const bool is_last = true;
  const bool no_flush = false;
  const size_t input_size = 4096;
  size_t out_size;
  uint8_t input_buffer[input_size];
  uint8_t *output_buffer;

  memset(&input_buffer[0], 0, input_size);

  brotli::BrotliParams params;
  params.mode = brotli::BrotliParams::MODE_GENERIC;
  params.quality = 11;
  params.lgwin = 22;
  params.lgblock = 0;

  brotli::BrotliCompressor *compressor = new brotli::BrotliCompressor(params);

  compressor->input_block_size();

  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #1
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #2
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // crash on Windows 10, 64bit, MinGW, gcc v4.9.2
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #4
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #5
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #6
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #7
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #8
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #9
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // crash on Ubuntu Linux, 64bit, GCC v4.9.2-10
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // #11
  compressor->CopyInputToRingBuffer(4096, &input_buffer[0]);
  compressor->WriteBrotliData(is_last, no_flush, &out_size, &output_buffer); // crash on Windows 10, 64bit, Visual C++ 2015 Update v2

  delete compressor;

  return 0;
}

The loop was unrolled by intend ;-)

Created to demonstrate google/brotli#346