diff --git a/cruft/util b/cruft/util
index 05880da..0d348a8 160000
--- a/cruft/util
+++ b/cruft/util
@@ -1 +1 @@
-Subproject commit 05880da6911c366d6f9546fec448ae1b3e6e8b7b
+Subproject commit 0d348a83458812d82ece205a67c638efdae64011
diff --git a/tools/analyse.cpp b/tools/analyse.cpp
index 13d8d59..9e06f9b 100644
--- a/tools/analyse.cpp
+++ b/tools/analyse.cpp
@@ -14,14 +14,16 @@
 #include <cruft/util/io.hpp>
 #include <cruft/util/view.hpp>
 #include <cruft/util/parse/value.hpp>
+#include <cruft/util/posix/except.hpp>
 
 #include <fmt/format.h>
 #include <fmt/compile.h>
 
 #include <algorithm>
-#include <iostream>
 #include <compare>
+#include <filesystem>
 #include <fstream>
+#include <iostream>
 
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -59,6 +61,89 @@ static bool region_equal (emory::chunk::region const &a, emory::chunk::region co
 //}
 
 
+///////////////////////////////////////////////////////////////////////////////
+static void find_path_chunks (
+    std::vector<emory::chunk::region> &res,
+    std::filesystem::path const &src,
+    emory::chunk::params const &p
+);
+
+
+//-----------------------------------------------------------------------------
+static
+void
+find_regular_chunks (
+    std::vector<emory::chunk::region> &res,
+    std::filesystem::path const &src,
+    emory::chunk::params const &p
+) {
+    try {
+        emory::chunk::find<emory::chunk::static_hash> (
+            std::back_inserter (res),
+            cruft::mapped_file (src),
+            p
+        );
+    } catch (cruft::posix::error &err) {
+        fmt::print (stderr, "skipping {}, error: {}\n", src.string (), err.what ());
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+static
+void
+find_directory_chunks (
+    std::vector<emory::chunk::region> &res,
+    std::filesystem::path const &src,
+    emory::chunk::params const &p
+) {
+    fmt::print (stderr, "{}\n", src.string ());
+    for (auto const &child: std::filesystem::directory_iterator (src)) {
+        find_path_chunks (res, child, p);
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+static void find_path_chunks (
+    std::vector<emory::chunk::region> &res,
+    std::filesystem::path const &src,
+    emory::chunk::params const &p
+) {
+    switch (auto const type = status (src).type (); type) {
+    case std::filesystem::file_type::regular:
+        return find_regular_chunks (res, src, p);
+
+    case std::filesystem::file_type::directory:
+        return find_directory_chunks (res, src, p);
+
+    case std::filesystem::file_type::none:
+    case std::filesystem::file_type::not_found:
+    case std::filesystem::file_type::symlink:
+    case std::filesystem::file_type::block:
+    case std::filesystem::file_type::character:
+    case std::filesystem::file_type::fifo:
+    case std::filesystem::file_type::socket:
+    case std::filesystem::file_type::unknown:
+        fmt::print (stderr, "skipping path of unhandled type: '{}'\n", src.string ());
+        return;
+    }
+
+    unreachable ();
+}
+
+
+//-----------------------------------------------------------------------------
+static
+std::vector<emory::chunk::region>
+find_chunks (std::filesystem::path const &src, emory::chunk::params const &p)
+{
+    std::vector<emory::chunk::region> res;
+    find_path_chunks (res, src, p);
+    return res;
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 enum {
     ARG_SELF,
@@ -88,9 +173,9 @@ int main (int argc, char const **argv)
 
     emory::chunk::params p = emory::chunk::DEFAULT_PARAMS;
     if (argc > ARG_BITS + 1)
-        p.bits = cruft::parse::from_string<std::size_t> (argv[ARG_WINDOW]);
+        p.bits = cruft::parse::from_string<std::size_t> (argv[ARG_BITS]);
     if (argc > ARG_WINDOW + 1)
-        p.window = cruft::parse::from_string<std::size_t> (argv[ARG_BITS]);
+        p.window = cruft::parse::from_string<std::size_t> (argv[ARG_WINDOW]);
     if (argc > ARG_BITS + 1)
         p.minimum = cruft::parse::from_string<std::size_t> (argv[ARG_MINIMUM]);
 
@@ -99,32 +184,10 @@ int main (int argc, char const **argv)
     std::ofstream output (argv[ARGS_OUTPUT], std::ios::out | std::ios::trunc);
     output.exceptions (std::ios::badbit | std::ios::eofbit | std::ios::failbit);
 
-    cruft::mapped_file data (argv[ARGS_INPUT]);
-    std::cout << "size: " << data.size () << '\n';
-
     std::cout << "processing\n";
-    std::vector<emory::chunk::region> src;
-    emory::chunk::find<emory::chunk::static_hash> (std::back_inserter (src), data, p);
+    std::vector<emory::chunk::region> src = find_chunks (argv[ARGS_INPUT], p);
 
-    std::cout << "validating\n";
-    std::cout << src.size () << " chunks\n";
-    std::sort (
-        src.begin (),
-        src.end   (),
-        [] (auto const &a, auto const &b) { return a.offset.first < b.offset.first; }
-    );
-    for (off_t i = 0, cursor = 0; i < std::ssize (src); ++i) {
-        if (src[i].offset.first != cursor) {
-            std::cout << "non-overlapping chunks\n";
-            return -1;
-        }
-        cursor = src[i].offset.second;
-    }
-
-    if (src.back ().offset.second != std::ssize (data)) {
-        std::cout << "invalid total size\n";
-        return -1;
-    }
+    fmt::print ("analysing {} chunks\n", src.size ());
 
     std::sort (
         src.begin (),
@@ -132,6 +195,14 @@ int main (int argc, char const **argv)
         region_less
     );
 
+    output << "params: " << p << '\n';
+    for (auto const &chunk: src) {
+        output << chunk.size() << ' ';
+        for (auto const &c: chunk.digest)
+            output << std::hex << std::setw (2) << std::setfill ('0') << +c;
+        output << std::dec << '\n';
+    }
+
     std::vector<off64_t> sizes;
     std::transform (
         src.begin (),
@@ -145,7 +216,7 @@ int main (int argc, char const **argv)
     auto const total_bytes = std::accumulate (
         src.begin (),
         src.end   (),
-        0,
+        std::uintmax_t (0),
         [] (auto const accum, auto const rhs)
     {
         return accum + rhs.size ();
@@ -175,5 +246,5 @@ int main (int argc, char const **argv)
         100.f * duplicated_fraction
     );
 
-    std::cout << (src.size () - unique.size ()) << " duplicates\n";
+    fmt::print ("{} duplicates\n", src.size () - unique.size ());
 }