switch to CMake

src/RareItemSet.cc

@@ -0,0 +1,24 @@
+#include "RareItemSet.hh"
+
+#include <phosg/Filesystem.hh>
+#include <phosg/Random.hh>
+
+using namespace std;
+
+
+
+RareItemSet::RareItemSet(const char* filename, uint8_t episode,
+    uint8_t difficulty, uint8_t secid) {
+  scoped_fd fd(filename, O_RDONLY);
+  size_t offset = (episode * 0x6400) + (difficulty * 0x1900) + (secid * 0x0280);
+  preadx(fd, this, sizeof(*this), offset);
+}
+
+bool sample_rare_item(uint8_t pc) {
+  int8_t shift = ((pc >> 3) & 0x1F) - 4;
+  if (shift < 0) {
+    shift = 0;
+  }
+  uint32_t rate = ((2 << shift) * ((pc & 7) + 7));
+  return (random_object<uint32_t>() < rate);
+}