Add I2P support

src/i2p.h

@@ -0,0 +1,73 @@
+/*
+ * This file is part of the Monero P2Pool <https://github.com/SChernykh/p2pool>
+ * Copyright (c) 2021-2026 SChernykh <https://github.com/SChernykh>
+ * Copyright (c) 2026 jpk68
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common.h"
+#include <string>
+#include <uv.h>
+
+namespace p2pool {
+
+static FORCEINLINE constexpr hash from_i2p_b32_const(const char* dest_hash)
+{
+	uint8_t buf[HASH_SIZE + 4] = {};
+	uint8_t* p = buf;
+
+	uint64_t data = 0;
+	uint64_t bit_size = 0;
+
+	for (size_t i = 0; i < 52; ++i) {
+		const char c = dest_hash[i];
+		uint64_t digit = 0;
+
+		if ('a' <= c && c <= 'z') {
+			digit = static_cast<uint64_t>(c - 'a');
+		}
+		else if ('A' <= c && c <= 'Z') {
+			digit = static_cast<uint64_t>(c - 'A');
+		}
+		else if ('2' <= c && c <= '7') {
+			digit = static_cast<uint64_t>(c - '2') + 26;
+		}
+		else {
+			return {};
+		}
+
+		data = (data << 5) | digit;
+		bit_size += 5;
+
+		while (bit_size >= 8) {
+			bit_size -= 8;
+			*(p++) = static_cast<uint8_t>(data >> bit_size);
+		}
+	}
+
+	hash result;
+
+	for (size_t i = 0; i < HASH_SIZE; ++i) {
+		result.h[i] = buf[i];
+	}
+
+	return result;
+}
+
+hash from_i2p_b32(const std::string& address);
+std::string to_i2p_b32(const hash& dest_hash);
+
+} // namespace p2pool