// Mode: -*- C++ -*-namespace regtest {class Delta {public:  Delta(const Block &block);  ~Delta() {    xd3_free_stream(&stream_);  }  xoff_t AddedBytes() const {    return stream_.whole_target.addslen;  }  xoff_t Windows() const {    return stream_.whole_target.wininfolen;  }  void Print() const;private:  xd3_stream stream_;};Delta::Delta(const Block &block) {  int ret;  xd3_config config;  memset(&stream_, 0, sizeof (stream_));  memset(&config, 0, sizeof (config));  xd3_init_config(&config, XD3_SKIP_EMIT | XD3_ADLER32_NOVER);  CHECK_EQ(0, xd3_config_stream (&stream_, &config));  xd3_avail_input (&stream_, block.Data(), block.Size());  bool done = false;  while (!done) {    ret = xd3_decode_input(&stream_);        switch (ret) {    case XD3_INPUT:      done = true;      break;    case XD3_OUTPUT:      CHECK_EQ(0, xd3_whole_append_window (&stream_));      break;    case XD3_GOTHEADER:    case XD3_WINSTART:    case XD3_WINFINISH:      break;    default:      DP(RINT "error code %s\n", xd3_strerror (ret));      abort();    }  }}void Delta::Print() const {  for (size_t i = 0; i < stream_.whole_target.instlen; i++) {    xd3_winst &winst = stream_.whole_target.inst[i];    switch (winst.type) {    case XD3_RUN:       DP(RINT "%"Q"u run %u\n", winst.position, winst.size);      break;    case XD3_ADD:       DP(RINT "%"Q"u add %u\n", winst.position, winst.size);      break;    default:      DP(RINT "%"Q"u copy %u @ %"Q"u (mode %u)\n", 	 winst.position, winst.size, winst.addr, winst.mode);      break;    }  }}}  // namespace