diff --git a/backend-chests.lua b/backend-chests.lua
index d1eb64f..9c3f6b1 100644
--- a/backend-chests.lua
+++ b/backend-chests.lua
@@ -83,11 +83,12 @@ local function find_space()
     end
 end
 
-local function find_by_ID_meta(id, meta)
+local function find_by_ID_meta_NBT(ID, meta, NBT)
     return find(function(item)
         return 
             (not meta or item.damage == meta) and -- if metadata provided, ensure match
-            (not id or item.name == id) -- if internal name provided, ensure match
+            (not id or item.name == ID) and -- if internal name provided, ensure match
+            (not NBT or item.nbtHash == NBT) -- if NBT hash provided, ensure match
     end)
 end
 
@@ -125,7 +126,7 @@ local function server(command)
     elseif command.type == "reindex" then
         os.queueEvent "reindex"
     elseif command.type == "extract" then
-        local result = find_by_ID_meta(command.ID, command.meta)
+        local result = find_by_ID_meta(command.ID, command.meta, command.NBT)
         local first_available = result[1]
 
         -- Check if we have an item, and its stack is big enough; otherwise, send back an error.
@@ -164,7 +165,14 @@ local function server(command)
 
         return { moved = moved }
     elseif command.type == "search" then
-        return d.map(search(command.query, command.threshold), function(x) return x.item end)
+        local matching_items =  d.map(search(command.query, command.threshold), function(x) return x.item end)
+        local out = {}
+        for _, stack in pairs(matching_items) do
+            local i = w.get_internal_identifier(stack)
+            if out[i] then out[i] = out[i] + stack.count
+            else out[i] = stack.count end
+        end
+        return matching_items
     end
 end
 
diff --git a/lib.lua b/lib.lua
index e54b3ee..e60d9f1 100644
--- a/lib.lua
+++ b/lib.lua
@@ -173,6 +173,24 @@ end
 
 -- GENERAL STUFF
 
+-- Converts a table of the form {"x", "x", "y"} into {x = 2, y = 1}
+local function collate(items)
+    local ret = {}
+    for _, i in pairs(items) do
+        ret[i] = (ret[i] or 0) + 1
+    end
+    return ret
+end
+
+-- Checks whether "needs"'s (a collate-formatted table) values are all greater than those of "has"
+local function satisfied(needs, has)
+    local good = true
+    for k, qty in pairs(needs) do
+        if qty > (has[k] or 0) then good = false end
+    end
+    return good
+end
+
 -- Loads a config file (in serialized-table format) from "filename" or wyvern_config.tbl
 -- "required_data" is a list of keys which must be in the config file's data
 -- "defaults" is a map of keys and default values for them, which will be used if there is no matching key in the data
@@ -211,4 +229,4 @@ local function init()
     d.map(find_peripherals(function(type, name, wrapped) return type == "modem" end), function(p) rednet.open(p.name) end)
 end
 
-return { errors = errors, serve = serve, query_by_ID = query_by_ID, query_by_type = query_by_type, get_internal_identifier = get_internal_identifier, load_config = load_config, find_peripherals = find_peripherals, init = init }
\ No newline at end of file
+return { errors = errors, serve = serve, query_by_ID = query_by_ID, query_by_type = query_by_type, get_internal_identifier = get_internal_identifier, load_config = load_config, find_peripherals = find_peripherals, init = init, collate = collate, satisfied = satisfied }
\ No newline at end of file