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// Mode: -*- C++ -*-
class Delta {
public:
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:
cerr << "decode: " << done;
abort();
}
}
}
~Delta() {
xd3_free_stream(&stream_);
}
xoff_t AddedBytes() const {
return stream_.whole_target.addslen;
}
xoff_t Windows() const {
return stream_.whole_target.wininfolen;
}
// Note: This does not benefit from -Wformat= checking, due to the
// enclosing template. Further, it was not used.
// void 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 %" W "u\n", winst.position, winst.size);
// break;
// case XD3_ADD:
// DP(RINT "%" Q "u add %" W "u\n", winst.position, winst.size);
// break;
// default:
// DP(RINT "%" Q "u copy %" W "u @ %" Q "u (mode %u)\n",
// winst.position, winst.size, winst.addr, winst.mode);
// break;
// }
// }
// }
private:
xd3_stream stream_;
};
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