main: add block timestamp index

src/txdb.cpp

@@ -22,6 +22,7 @@ static const char DB_COINS = 'c';
 static const char DB_BLOCK_FILES = 'f';
 static const char DB_TXINDEX = 't';
 static const char DB_ADDRESSINDEX = 'a';
+static const char DB_TIMESTAMPINDEX = 's';
 static const char DB_BLOCK_INDEX = 'b';
 
 static const char DB_BEST_BLOCK = 'B';
@@ -196,6 +197,32 @@ bool CBlockTreeDB::ReadAddressIndex(uint160 addressHash, int type, std::vector<s
     return true;
 }
 
+bool CBlockTreeDB::WriteTimestampIndex(const CTimestampIndexKey &timestampIndex) {
+    CDBBatch batch(&GetObfuscateKey());
+    batch.Write(make_pair(DB_TIMESTAMPINDEX, timestampIndex), NULL);
+    return WriteBatch(batch);
+}
+
+bool CBlockTreeDB::ReadTimestampIndex(const unsigned int &high, const unsigned int &low, std::vector<uint256> &hashes) {
+
+    boost::scoped_ptr<CDBIterator> pcursor(NewIterator());
+
+    pcursor->Seek(make_pair(DB_TIMESTAMPINDEX, CTimestampIndexIteratorKey(low)));
+
+    while (pcursor->Valid()) {
+        boost::this_thread::interruption_point();
+        std::pair<char, CTimestampIndexKey> key;
+        if (pcursor->GetKey(key) && key.first == DB_TIMESTAMPINDEX && key.second.timestamp <= high) {
+            hashes.push_back(key.second.blockHash);
+            pcursor->Next();
+        } else {
+            break;
+        }
+    }
+
+    return true;
+}
+
 bool CBlockTreeDB::WriteFlag(const std::string &name, bool fValue) {
     return Write(std::make_pair(DB_FLAG, name), fValue ? '1' : '0');
 }