module Array = ArrayLabels
module List = ListLabels
-module StrSet= Set.Make(String)
+module StrSet = Set.Make(String)
module Unix = UnixLabels
module Stream : sig
val iter : 'a t -> f:('a -> unit) -> unit
+ val map : 'a t -> f:('a -> 'b) -> 'b t
+
+ val filter : 'a t -> f:('a -> bool) -> 'a t
+
val concat : ('a t) list -> 'a t
end = struct
module S = Stream
type 'a t =
- ('a S.t) list
+ {mutable streams : ('a S.t) list}
let create f =
- [S.from (fun _ -> f ())]
+ {streams = [S.from (fun _ -> f ())]}
+
+ let rec next t =
+ match t.streams with
+ | [] ->
+ None
+ | s :: streams ->
+ (match S.next s with
+ | exception Stream.Failure ->
+ t.streams <- streams;
+ next t
+ | x ->
+ Some x
+ )
+
+ let map t ~f =
+ create (fun () ->
+ match next t with
+ | None -> None
+ | Some x -> Some (f x)
+ )
+
+ let filter t ~f =
+ let rec filter () =
+ match next t with
+ | None ->
+ None
+ | Some x when f x ->
+ Some x
+ | Some _ ->
+ filter ()
+ in
+ create filter
let iter t ~f =
- List.iter t ~f:(S.iter f)
+ List.iter t.streams ~f:(S.iter f)
let concat ts =
- List.concat ts
+ {streams = List.concat (List.map ts ~f:(fun {streams} -> streams))}
end
module In_channel : sig
)
end
-module Directory_tree : sig
- val find_files : string -> string Stream.t
+module File : sig
+ type t =
+ { path : string
+ ; size : int
+ }
+
+ val find : string -> t Stream.t
+ (** Find all files in the directory tree, starting from the given root path *)
+
+ val lookup : string Stream.t -> t Stream.t
+ (** Lookup file info for given paths *)
+
+ module Set : sig include Set.S with type elt := t end
end = struct
- let find_files root =
+ type t =
+ { path : string
+ ; size : int
+ }
+
+ let compare {path=p1; _} {path=p2; _} =
+ Stdlib.compare p1 p2
+
+ let lookup paths =
+ Stream.map paths ~f:(fun path ->
+ let {Unix.st_size = size; _} = Unix.lstat path in
+ {path; size}
+ )
+
+ let find root =
let dirs = Queue.create () in
let files = Queue.create () in
let explore parent =
Array.iter (Sys.readdir parent) ~f:(fun child ->
let path = Filename.concat parent child in
- let {Unix.st_kind = file_kind; _} = Unix.lstat path in
+ let {Unix.st_kind = file_kind; st_size; _} = Unix.lstat path in
match file_kind with
| Unix.S_REG ->
- Queue.add path files
+ let file = {path; size = st_size} in
+ Queue.add file files
| Unix.S_DIR ->
Queue.add path dirs
| Unix.S_CHR
next ()
in
Stream.create next
+
+ module Set = Set.Make(struct
+ type elt = t
+ type t = elt
+ let compare = compare
+ end)
end
type input =
| Stdout
| Directory of string
-let make_input_stream = function
- | Stdin ->
- In_channel.lines stdin
- | Directories paths ->
- let paths = StrSet.elements (StrSet.of_list paths) in
- Stream.concat (List.map paths ~f:Directory_tree.find_files)
+type opt =
+ { input : input
+ ; output : output
+ ; ignore : Str.regexp option
+ ; sample : int
+ }
+
+type count =
+ { considered : int ref
+ ; empty : int ref
+ ; ignored : int ref
+ ; unique_size : int ref
+ ; unique_sample : int ref
+ ; hashed : int ref
+ }
+
+let make_input_stream input ignore count =
+ let input =
+ match input with
+ | Stdin ->
+ File.lookup (In_channel.lines stdin)
+ | Directories paths ->
+ let paths = StrSet.elements (StrSet.of_list paths) in
+ Stream.concat (List.map paths ~f:File.find)
+ in
+ Stream.filter input ~f:(fun {File.path; size} ->
+ incr count.considered;
+ let empty = size = 0 in
+ let ignored =
+ match ignore with
+ | Some regexp when (Str.string_match regexp path 0) ->
+ true
+ | Some _ | None ->
+ false
+ in
+ if empty then incr count.empty;
+ if ignored then incr count.ignored;
+ (not empty) && (not ignored)
+ )
let make_output_fun = function
| Stdout ->
- fun digest n_paths paths ->
- printf "%s %d\n%!" (Digest.to_hex digest) n_paths;
- List.iter (StrSet.elements paths) ~f:(printf " %S\n%!")
+ fun digest n_files files ->
+ printf "%s %d\n%!" (Digest.to_hex digest) n_files;
+ List.iter (File.Set.elements files) ~f:(fun {File.path; _} ->
+ printf " %S\n%!" path
+ )
| Directory dir ->
- fun digest _ paths ->
+ fun digest _ files ->
let digest = Digest.to_hex digest in
let dir = Filename.concat dir (String.sub digest 0 2) in
Unix.mkdir dir ~perm:0o700;
let oc = open_out (Filename.concat dir digest) in
- List.iter (StrSet.elements paths) ~f:(fun path ->
+ List.iter (File.Set.elements files) ~f:(fun {File.path; _} ->
output_string oc (sprintf "%S\n%!" path)
);
close_out oc
-let main input output ignore =
- let output = make_output_fun output in
- let input = make_input_stream input in
- let paths_by_digest = Hashtbl.create 1_000_000 in
- let path_count = ref 0 in
+let sample path ~len =
+ let buf = Bytes.make len ' ' in
+ let ic = open_in_bin path in
+ let rec read pos len =
+ assert (len >= 0);
+ if len = 0 then
+ ()
+ else begin
+ let chunk_size = input ic buf pos len in
+ if chunk_size = 0 then (* EOF *)
+ ()
+ else
+ read (pos + chunk_size) (len - chunk_size)
+ end
+ in
+ read 0 len;
+ close_in ic;
+ Bytes.to_string buf
+
+let main {input; output; ignore; sample = sample_len} =
let t0 = Sys.time () in
- let process path =
- try
- let digest = Digest.file path in
- let count, paths =
- match Hashtbl.find_opt paths_by_digest digest with
- | None ->
- (0, StrSet.empty)
- | Some (n, paths) ->
- (n, paths)
- in
- Hashtbl.replace paths_by_digest digest (count + 1, StrSet.add path paths)
- with Sys_error e ->
- eprintf "WARNING: Failed to process %S: %S\n%!" path e
+ let count =
+ { considered = ref 0
+ ; empty = ref 0
+ ; ignored = ref 0
+ ; unique_size = ref 0
+ ; hashed = ref 0
+ ; unique_sample = ref 0
+ }
in
- Stream.iter input ~f:(fun path ->
- incr path_count;
- match ignore with
- | Some regexp when (Str.string_match regexp path 0) ->
- ()
- | Some _ | None ->
- process path
+ let output = make_output_fun output in
+ let input = make_input_stream input ignore count in
+ let files_by_size = Hashtbl.create 1_000_000 in
+ let files_by_sample = Hashtbl.create 1_000_000 in
+ let files_by_digest = Hashtbl.create 1_000_000 in
+ let process tbl ~group ~file =
+ let count, files =
+ match Hashtbl.find_opt tbl group with
+ | None ->
+ (0, File.Set.empty)
+ | Some (n, files) ->
+ (n, files)
+ in
+ Hashtbl.replace tbl group (count + 1, File.Set.add file files)
+ in
+ Stream.iter input ~f:(fun ({File.size; _} as file) ->
+ process files_by_size ~group:size ~file
);
- Hashtbl.iter (fun d (n, ps) -> if n > 1 then output d n ps) paths_by_digest;
+ Hashtbl.iter
+ (fun _ (n, files) ->
+ (* Skip files with unique sizes *)
+ if n > 1 then
+ File.Set.iter
+ (fun ({File.path; _} as file) ->
+ process
+ files_by_sample
+ ~group:(sample path ~len:sample_len)
+ ~file
+ )
+ files
+ else
+ incr count.unique_size;
+ )
+ files_by_size;
+ Hashtbl.iter
+ (fun _ (n, files) ->
+ (* Skip files with unique samples *)
+ if n > 1 then
+ File.Set.iter
+ (fun ({File.path; _} as file) ->
+ incr count.hashed;
+ process files_by_digest ~group:(Digest.file path) ~file
+ )
+ files
+ else
+ incr count.unique_sample;
+ )
+ files_by_sample;
+ Hashtbl.iter
+ (fun d (n, files) ->
+ if n > 1 then
+ output d n files
+ )
+ files_by_digest;
let t1 = Sys.time () in
- eprintf "Processed %d files in %f seconds.\n%!" !path_count (t1 -. t0)
+ eprintf "Time : %f seconds\n%!" (t1 -. t0);
+ eprintf "Considered : %d\n%!" !(count.considered);
+ eprintf "Hashed : %d\n%!" !(count.hashed);
+ eprintf "Skipped due to 0 size : %d\n%!" !(count.empty);
+ eprintf "Skipped due to unique size : %d\n%!" !(count.unique_size);
+ eprintf "Skipped due to unique sample : %d\n%!" !(count.unique_sample);
+ eprintf "Ignored due to regex match : %d\n%!" !(count.ignored)
-let () =
- let input = ref Stdin in
- let output = ref Stdout in
- let ignore = ref None in
- let assert_file_exists path =
- if Sys.file_exists path then
- ()
- else begin
- eprintf "File does not exist: %S\n%!" path;
+let get_opt () : opt =
+ let assert_ test x msg =
+ if not (test x) then begin
+ eprintf "%s\n%!" msg;
exit 1
end
in
+ let assert_file_exists path =
+ assert_ Sys.file_exists path (sprintf "File does not exist: %S" path)
+ in
let assert_file_is_dir path =
- if Sys.is_directory path then
- ()
- else begin
- eprintf "File is not a directory: %S\n%!" path;
- exit 1
- end
+ assert_ Sys.is_directory path (sprintf "File is not a directory: %S" path)
in
+ let input = ref Stdin in
+ let output = ref Stdout in
+ let ignore = ref None in
+ let sample = ref 256 in
let spec =
[ ( "-out"
, Arg.String (fun path ->
, Arg.String (fun regexp -> ignore := Some (Str.regexp regexp))
, " Ignore file paths which match this regexp pattern (see Str module)."
)
+ ; ( "-sample"
+ , Arg.Set_int sample
+ , (sprintf " Byte size of file samples to use. Default: %d" !sample)
+ )
]
in
Arg.parse
input := Directories (path :: paths)
)
"";
- main !input !output !ignore
+ assert_
+ (fun x -> x > 0)
+ !sample
+ (sprintf "Sample size cannot be negative: %d" !sample);
+ { input = !input
+ ; output = !output
+ ; ignore = !ignore
+ ; sample = !sample
+ }
+
+let () =
+ main (get_opt ())
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