Merge pull request #661 from evoskuil/master

Add query get_filter_heads(...).

Author: evoskuil

include/bitcoin/database/impl/query/optional.ipp

@@ -243,6 +243,19 @@ bool CLASS::get_filter_hashes(hashes& filter_hashes,
     return get_filter_head(previous_header, link);
 }
 
+TEMPLATE
+bool CLASS::get_filter_heads(hashes& filter_heads,
+    size_t stop_height, size_t interval) const NOEXCEPT
+{
+    size_t height{};
+    filter_heads.resize(system::floored_divide(stop_height, interval));
+    for (auto& head: filter_heads)
+        if (!get_filter_head(head, to_confirmed((height += interval))))
+            return false;
+
+    return true;
+}
+
 // set_filter_body
 // ----------------------------------------------------------------------------
 

include/bitcoin/database/query.hpp

@@ -569,14 +569,17 @@ class query
 
     bool is_filtered_body(const header_link& link) const NOEXCEPT;
     bool get_filter_body(filter& out, const header_link& link) const NOEXCEPT;
-    bool set_filter_body(const header_link& link, const block& block) NOEXCEPT;
-    bool set_filter_body(const header_link& link, const filter& body) NOEXCEPT;
 
     bool is_filtered_head(const header_link& link) const NOEXCEPT;
     bool get_filter_head(hash_digest& out, const header_link& link) const NOEXCEPT;
     bool get_filter_hash(hash_digest& out, const header_link& link) const NOEXCEPT;
     bool get_filter_hashes(hashes& filter_hashes, hash_digest& previous_header,
         const header_link& stop_link, size_t count) const NOEXCEPT;
+    bool get_filter_heads(hashes& filter_heads, size_t stop_height,
+        size_t interval) const NOEXCEPT;
+
+    bool set_filter_body(const header_link& link, const block& block) NOEXCEPT;
+    bool set_filter_body(const header_link& link, const filter& body) NOEXCEPT;
     bool set_filter_head(const header_link& link) NOEXCEPT;
     bool set_filter_head(const header_link& link, const hash_digest& head,
         const hash_digest& hash) NOEXCEPT;