1 files changed, 33 insertions, 0 deletions
diff --git a/storage.cpp b/storage.cpp
index 6fb5b64..e7e9248 100644
--- a/storage.cpp
+++ b/storage.cpp
@@ -4,6 +4,7 @@
 
 #include <chrono>
 #include <iostream>
+#include <random>
 
 #include <SQLiteCpp/SQLiteCpp.h>
 
@@ -164,3 +165,35 @@ void Storage::setRow(const std::string& id, const std::string& document, int rev
   throw std::runtime_error("Unable to insert row with id "s + id);
 }
 
+uint32_t Storage::checksum32(const std::string& s)
+{
+ uint32_t result{0};
+ for (unsigned int i = 0; i < s.size(); i++) {
+  result = ((result >> 1) | ((result & 1) << 31)) ^ (s[i] & 0xFF);
+ }
+ return result & 0x7FFFFFFF;
+}
+
+std::string Storage::generate_id()
+{
+ static std::random_device r;
+ static std::default_random_engine e1(r());
+ static std::uniform_int_distribution<int> uniform_dist(0, 35);
+
+ // limit tries
+ for (int j = 0; j < 100000; j++) {
+  std::string result;
+  for (int i = 0; i < 6; i++) {
+   char c{static_cast<char>('0' + uniform_dist(e1))};
+   if (c > '9')
+    c = c - '9' + 'a';
+   result.push_back(c);
+  }
+
+  if (!exists(result))
+   return result;
+ }
+
+ return "endofcodes";
+}
+