main: add block timestamp index

src/main.h

@@ -112,6 +112,7 @@ static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
 static const bool DEFAULT_TXINDEX = false;
 static const bool DEFAULT_ADDRESSINDEX = false;
+static const bool DEFAULT_TIMESTAMPINDEX = false;
 static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
 
 static const bool DEFAULT_TESTSAFEMODE = false;
@@ -291,6 +292,67 @@ struct CNodeStateStats {
     std::vector<int> vHeightInFlight;
 };
 
+struct CTimestampIndexIteratorKey {
+    unsigned int timestamp;
+
+    size_t GetSerializeSize(int nType, int nVersion) const {
+        return 4;
+    }
+    template<typename Stream>
+    void Serialize(Stream& s, int nType, int nVersion) const {
+        ser_writedata32be(s, timestamp);
+    }
+    template<typename Stream>
+    void Unserialize(Stream& s, int nType, int nVersion) {
+        timestamp = ser_readdata32be(s);
+    }
+
+    CTimestampIndexIteratorKey(unsigned int time) {
+        timestamp = time;
+    }
+
+    CTimestampIndexIteratorKey() {
+        SetNull();
+    }
+
+    void SetNull() {
+        timestamp = 0;
+    }
+};
+
+struct CTimestampIndexKey {
+    unsigned int timestamp;
+    uint256 blockHash;
+
+    size_t GetSerializeSize(int nType, int nVersion) const {
+        return 36;
+    }
+    template<typename Stream>
+    void Serialize(Stream& s, int nType, int nVersion) const {
+        ser_writedata32be(s, timestamp);
+        blockHash.Serialize(s, nType, nVersion);
+    }
+    template<typename Stream>
+    void Unserialize(Stream& s, int nType, int nVersion) {
+        timestamp = ser_readdata32be(s);
+        blockHash.Unserialize(s, nType, nVersion);
+    }
+
+    CTimestampIndexKey(unsigned int time, uint256 hash) {
+        timestamp = time;
+        blockHash = hash;
+    }
+
+    CTimestampIndexKey() {
+        SetNull();
+    }
+
+    void SetNull() {
+        timestamp = 0;
+        blockHash.SetNull();
+    }
+};
+
 struct CAddressIndexKey {
     unsigned int type;
     uint160 hashBytes;
@@ -510,6 +572,7 @@ public:
     ScriptError GetScriptError() const { return error; }
 };
 
+bool GetTimestampIndex(const unsigned int &high, const unsigned int &low, std::vector<uint256> &hashes);
 bool GetAddressIndex(uint160 addressHash, int type, std::vector<std::pair<CAddressIndexKey, CAmount> > &addressIndex);
 
 /** Functions for disk access for blocks */