1 files changed, 8 insertions, 73 deletions
diff --git a/src/wallet/walletutil.cpp b/src/wallet/walletutil.cpp
index 8bac0608a9..dd2f071b6c 100644
--- a/src/wallet/walletutil.cpp
+++ b/src/wallet/walletutil.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2017-2019 The Bitcoin Core developers
+// Copyright (c) 2017-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -29,81 +29,16 @@ fs::path GetWalletDir()
     return path;
 }
 
-static bool IsBerkeleyBtree(const fs::path& path)
-{
-    if (!fs::exists(path)) return false;
-
-    // A Berkeley DB Btree file has at least 4K.
-    // This check also prevents opening lock files.
-    boost::system::error_code ec;
-    auto size = fs::file_size(path, ec);
-    if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), path.string());
-    if (size < 4096) return false;
-
-    fsbridge::ifstream file(path, std::ios::binary);
-    if (!file.is_open()) return false;
-
-    file.seekg(12, std::ios::beg); // Magic bytes start at offset 12
-    uint32_t data = 0;
-    file.read((char*) &data, sizeof(data)); // Read 4 bytes of file to compare against magic
-
-    // Berkeley DB Btree magic bytes, from:
-    //  https://github.com/file/file/blob/5824af38469ec1ca9ac3ffd251e7afe9dc11e227/magic/Magdir/database#L74-L75
-    //  - big endian systems - 00 05 31 62
-    //  - little endian systems - 62 31 05 00
-    return data == 0x00053162 || data == 0x62310500;
-}
-
-std::vector<fs::path> ListWalletDir()
-{
-    const fs::path wallet_dir = GetWalletDir();
-    const size_t offset = wallet_dir.string().size() + 1;
-    std::vector<fs::path> paths;
-    boost::system::error_code ec;
-
-    for (auto it = fs::recursive_directory_iterator(wallet_dir, ec); it != fs::recursive_directory_iterator(); it.increment(ec)) {
-        if (ec) {
-            LogPrintf("%s: %s %s\n", __func__, ec.message(), it->path().string());
-            continue;
-        }
-
-        // Get wallet path relative to walletdir by removing walletdir from the wallet path.
-        // This can be replaced by boost::filesystem::lexically_relative once boost is bumped to 1.60.
-        const fs::path path = it->path().string().substr(offset);
-
-        if (it->status().type() == fs::directory_file && IsBerkeleyBtree(it->path() / "wallet.dat")) {
-            // Found a directory which contains wallet.dat btree file, add it as a wallet.
-            paths.emplace_back(path);
-        } else if (it.level() == 0 && it->symlink_status().type() == fs::regular_file && IsBerkeleyBtree(it->path())) {
-            if (it->path().filename() == "wallet.dat") {
-                // Found top-level wallet.dat btree file, add top level directory ""
-                // as a wallet.
-                paths.emplace_back();
-            } else {
-                // Found top-level btree file not called wallet.dat. Current bitcoin
-                // software will never create these files but will allow them to be
-                // opened in a shared database environment for backwards compatibility.
-                // Add it to the list of available wallets.
-                paths.emplace_back(path);
-            }
-        }
-    }
-
-    return paths;
-}
-
-WalletLocation::WalletLocation(const std::string& name)
-    : m_name(name)
-    , m_path(fs::absolute(name, GetWalletDir()))
+bool IsFeatureSupported(int wallet_version, int feature_version)
 {
+    return wallet_version >= feature_version;
 }
 
-bool WalletLocation::Exists() const
+WalletFeature GetClosestWalletFeature(int version)
 {
-    fs::path path = m_path;
-    // For the default wallet, check specifically for the wallet.dat file
-    if (m_name.empty()) {
-        path = fs::absolute("wallet.dat", m_path);
+    static constexpr std::array wallet_features{FEATURE_LATEST, FEATURE_PRE_SPLIT_KEYPOOL, FEATURE_NO_DEFAULT_KEY, FEATURE_HD_SPLIT, FEATURE_HD, FEATURE_COMPRPUBKEY, FEATURE_WALLETCRYPT, FEATURE_BASE};
+    for (const WalletFeature& wf : wallet_features) {
+        if (version >= wf) return wf;
     }
-    return fs::symlink_status(path).type() != fs::file_not_found;
+    return static_cast<WalletFeature>(0);
 }