git.sesse.net Git - remoteglot-book/blob - binmerger.cpp

   1 #include <stdio.h>
   2 #include <mtbl.h>
   3 #include <memory>
   4 #include <string>
   5 #include <string.h>
   6 #include <assert.h>
   7 #include "count.pb.h"
   8
   9 using namespace std;
  10
  11 void merge_count(void* userdata,
  12                  const uint8_t *key, size_t len_key,
  13                  const uint8_t *val0, size_t len_val0,
  14                  const uint8_t *val1, size_t len_val1,
  15                  uint8_t **merged_val, size_t *len_merged_val)
  16 {
  17         Count c0, c1;
  18         c0.ParseFromArray(val0, len_val0);
  19         c1.ParseFromArray(val1, len_val1);
  20
  21         Count c;
  22
  23         c.set_white(c0.white() + c1.white());
  24         c.set_draw(c0.draw() + c1.draw());
  25         c.set_black(c0.black() + c1.black());
  26         c.set_sum_white_elo(c0.sum_white_elo() + c1.sum_white_elo());
  27         c.set_sum_black_elo(c0.sum_black_elo() + c1.sum_black_elo());
  28         c.set_num_elo(c0.num_elo() + c1.num_elo());
  29         if (c0.first_timestamp() <= c1.first_timestamp()) {
  30                 c.set_opening_num(c0.opening_num());
  31                 if (c0.has_first_timestamp()) {
  32                         c.set_first_timestamp(c0.first_timestamp());
  33                 }
  34         } else {
  35                 c.set_opening_num(c1.opening_num());
  36                 if (c1.has_first_timestamp()) {
  37                         c.set_first_timestamp(c1.first_timestamp());
  38                 }
  39         }
  40
  41         static string buf;  // Keep allocated.
  42         c.SerializeToString(&buf);
  43
  44         *merged_val = reinterpret_cast<uint8_t *>(malloc(buf.size()));
  45         *len_merged_val = buf.size();
  46         memcpy(*merged_val, buf.data(), buf.size());
  47 }
  48
  49 int main(int argc, char **argv)
  50 {
  51         mtbl_merger_options* mopt = mtbl_merger_options_init();
  52         mtbl_merger_options_set_merge_func(mopt, merge_count, NULL);
  53         mtbl_merger* merger = mtbl_merger_init(mopt);
  54
  55         for (int i = 1; i < argc - 1; ++i) {
  56                 mtbl_reader* mtbl = mtbl_reader_init(argv[i], NULL);
  57                 mtbl_merger_add_source(merger, mtbl_reader_source(mtbl));
  58         }
  59
  60         mtbl_writer_options* wopt = mtbl_writer_options_init();
  61         mtbl_writer_options_set_block_size(wopt, 65536);
  62         mtbl_writer* writer = mtbl_writer_init(argv[argc - 1], wopt);
  63         mtbl_source_write(mtbl_merger_source(merger), writer);
  64         mtbl_writer_destroy(&writer);
  65 }