X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fhttp_getter%2Fhttp_getter_misc.ml;h=4b82dd8e7e067f73deb2267e1bbbbf2e9ec15dcd;hb=ef8c8f30c996d30617232a662ff4d3afc5a92a8f;hp=ab517e20ed66fdf57a188591b69e984d2ced1b10;hpb=32bc9336091a84376f93b06325c08dab58124a0d;p=helm.git

diff --git a/helm/http_getter/http_getter_misc.ml b/helm/http_getter/http_getter_misc.ml
index ab517e20e..4b82dd8e7 100644
--- a/helm/http_getter/http_getter_misc.ml
+++ b/helm/http_getter/http_getter_misc.ml
@@ -1,5 +1,7 @@
 (*
- *  Copyright (C) 2003, HELM Team.
+ * Copyright (C) 2003:
+ *    Stefano Zacchiroli <zack@cs.unibo.it>
+ *    for the HELM Team http://helm.cs.unibo.it/
  *
  *  This file is part of HELM, an Hypertextual, Electronic
  *  Library of Mathematics, developed at the Computer Science
@@ -21,12 +23,22 @@
  *  MA  02111-1307, USA.
  *
  *  For details, see the HELM World-Wide-Web page,
- *  http://cs.unibo.it/helm/.
+ *  http://helm.cs.unibo.it/
  *)
 
 open Http_getter_debugger;;
 open Printf;;
 
+let trailing_dot_gz_RE = Pcre.regexp "\\.gz$"   (* for g{,un}zip *)
+let url_RE = Pcre.regexp "^([\\w.]+)(:(\\d+))?(/.*)?$"
+let http_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^http://"
+let file_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^file://"
+let dir_sep_RE = Pcre.regexp "/"
+let heading_slash_RE = Pcre.regexp "^/"
+
+let bufsiz = 16384  (* for file system I/O *)
+let tcp_bufsiz = 4096 (* for TCP I/O *)
+
 let fold_file f init fname =
   let inchan = open_in fname in
   let rec fold_lines' value =
@@ -46,55 +58,143 @@ let hashtbl_sorted_fold f tbl init =
   in
   List.fold_left (fun acc k -> f k (Hashtbl.find tbl k) acc) init sorted_keys
 
+let cp src dst =
+  let (ic, oc) = (open_in src, open_out dst) in
+  let buf = String.create bufsiz in
+  (try
+    while true do
+      let bytes = input ic buf 0 bufsiz in
+      if bytes = 0 then raise End_of_file else output oc buf 0 bytes
+    done
+  with End_of_file -> ());
+  close_in ic; close_out oc
+
+let parse_url url =
+  try
+    let subs =
+      Pcre.extract ~rex:url_RE (Pcre.replace ~rex:http_scheme_RE url)
+    in
+    (subs.(1),
+    (if subs.(2) = "" then 80 else int_of_string subs.(3)),
+    (if subs.(4) = "" then "/" else subs.(4)))
+  with exc ->
+    failwith
+      (sprintf "Can't parse url: %s (exception: %s)"
+        url (Printexc.to_string exc))
+let init_socket addr port =
+  let inet_addr = (Unix.gethostbyname addr).Unix.h_addr_list.(0) in
+  let sockaddr = Unix.ADDR_INET (inet_addr, port) in
+  let suck = Unix.socket Unix.PF_INET Unix.SOCK_STREAM 0 in
+  Unix.connect suck sockaddr;
+  let outchan = Unix.out_channel_of_descr suck in
+  let inchan = Unix.in_channel_of_descr suck in
+  (inchan, outchan)
+let http_get_iter_buf ~callback url =
+  let (address, port, path) = parse_url url in
+  let buf = String.create tcp_bufsiz in
+  let (inchan, outchan) = init_socket address port in
+  output_string outchan (sprintf "GET %s\r\n" path);
+  flush outchan;
+  (try
+    while true do
+      match input inchan buf 0 tcp_bufsiz with
+      | 0 -> raise End_of_file
+      | bytes when bytes = tcp_bufsiz ->  (* buffer full, no need to slice it *)
+          callback buf
+      | bytes when bytes < tcp_bufsiz ->  (* buffer not full, slice it *)
+          callback (String.sub buf 0 bytes)
+      | _ -> (* ( bytes < 0 ) || ( bytes > tcp_bufsiz ) *)
+          assert false
+    done
+  with End_of_file -> ());
+  close_in inchan (* close also outchan, same fd *)
+
 let wget ?output url =
-  let flags =
-    (match output with Some file -> ["-O"; file] | None -> []) @ [url]
-  in
-  debug_print ("wget " ^ String.concat " " flags);
-  Shell.call
-    ~stdout:Shell.to_dev_null ~stderr:Shell.to_dev_null
-    [Shell.cmd "wget" flags]
+  debug_print
+    (sprintf "wgetting %s (output: %s)" url
+      (match output with None -> "default" | Some f -> f));
+  match url with
+  | url when Pcre.pmatch ~rex:file_scheme_RE url -> (* file:// *)
+      (let src_fname = Pcre.replace ~rex:file_scheme_RE url in
+      match output with
+      | Some dst_fname -> cp src_fname dst_fname
+      | None ->
+          let dst_fname = Filename.basename src_fname in
+          if src_fname <> dst_fname then
+            cp src_fname dst_fname
+          else  (* src and dst are the same: do nothing *)
+            ())
+  | url when Pcre.pmatch ~rex:http_scheme_RE url -> (* http:// *)
+      (let oc = 
+        open_out (match output with Some f -> f | None -> Filename.basename url)
+      in
+      http_get_iter_buf ~callback:(fun data -> output_string oc data) url;
+      close_out oc)
+  | scheme -> (* unsupported scheme *)
+      failwith ("Http_getter_misc.wget: unsupported scheme: " ^ scheme)
 
-  (* stderr shown as usual *)
 let gzip ?(keep = false) fname =
-  if keep then begin  (* keep original file *)
-    debug_print ("gzip -f -c " ^ fname);
-    Shell.call
-      ~stdout:(Shell.to_file (fname ^ ".gz"))
-      [Shell.cmd "gzip" ["-f"; "-c"; fname]]
-  end else begin  (* don't keep original file *)
-    debug_print ("gzip -f " ^ fname);
-    Shell.call [Shell.cmd "gzip" ["-f"; fname]]
-  end
-
-  (* stderr shown as usual *)
+  debug_print (sprintf "gzipping %s (keep: %b)" fname keep);
+  let (ic, oc) = (open_in fname, Gzip.open_out (fname ^ ".gz")) in
+  let buf = String.create bufsiz in
+  (try
+    while true do
+      let bytes = input ic buf 0 bufsiz in
+      if bytes = 0 then raise End_of_file else Gzip.output oc buf 0 bytes
+    done
+  with End_of_file -> ());
+  close_in ic; Gzip.close_out oc;
+  if not keep then Sys.remove fname
+
 let gunzip ?(keep = false) fname =
-  if not (Pcre.pmatch ~pat:"\\.gz$" fname) then
-    failwith "gunzip: source file doesn't end with '.gz'";
-  let basename = Pcre.replace ~pat:"\\.gz$" fname in
-  if keep then begin  (* keep original file *)
-    debug_print ("gunzip -f -c " ^ fname);
-    Shell.call
-      ~stdout:(Shell.to_file basename)
-      [Shell.cmd "gunzip" ["-f"; "-c"; fname]]
-  end else begin  (* don't keep original file *)
-    debug_print ("gunzip -f " ^ fname);
-    Shell.call [Shell.cmd "gunzip" ["-f"; fname]]
-  end
-
-let tempfile () =
-  let buf = Buffer.create 28 in (* strlen("/tmp/fileSzb3Mw_http_getter") *)
-  Shell.call
-    ~stdout:(Shell.to_buffer buf)
-    [Shell.cmd "tempfile" ["--suffix=_http_getter"]];
-  Pcre.replace ~pat:"\n" (Buffer.contents buf)
+  debug_print (sprintf "gunzipping %s (keep: %b)" fname keep);
+  let basename = Pcre.replace ~rex:trailing_dot_gz_RE fname in
+  assert (basename <> fname);
+  let (ic, oc) = (Gzip.open_in fname, open_out basename) in
+  let buf = String.create bufsiz in
+  (try
+    while true do
+      let bytes = Gzip.input ic buf 0 bufsiz in
+      if bytes = 0 then raise End_of_file else output oc buf 0 bytes
+    done
+  with End_of_file -> ());
+  Gzip.close_in ic; close_out oc;
+  if not keep then Sys.remove fname
+
+let tempfile () = Filename.temp_file "http_getter_" ""
+
+exception Mkdir_failure of string * string;;  (* dirname, failure reason *)
+let dir_perm = 0o755
 
 let mkdir ?(parents = false) dirname =
-  if not (Sys.file_exists dirname) then begin
-    let flags = if parents then ["-p"; dirname] else [dirname] in
-    debug_print ("mkdir " ^ String.concat " " flags);
-    Shell.call [Shell.cmd "mkdir" flags]
-  end
+  let mkdirhier () =
+    let (pieces, hd) =
+      let split = Pcre.split ~rex:dir_sep_RE dirname in
+      if Pcre.pmatch ~rex:heading_slash_RE dirname then
+        (List.tl split, "/")
+      else
+        (split, "")
+    in
+    ignore
+      (List.fold_left
+        (fun pre dir ->
+          let next_dir =
+            sprintf "%s%s%s" pre (match pre with "/" | "" -> "" | _ -> "/") dir
+          in
+          (try
+            (match (Unix.stat next_dir).Unix.st_kind with
+            | Unix.S_DIR -> ()  (* dir component already exists, go on! *)
+            | _ ->  (* dir component already exists but isn't a dir, abort! *)
+                raise
+                  (Mkdir_failure (dirname,
+                    sprintf "'%s' already exists but is not a dir" next_dir)))
+          with Unix.Unix_error (Unix.ENOENT, "stat", _) ->
+            (* dir component doesn't exists, create it and go on! *)
+            Unix.mkdir next_dir dir_perm);
+          next_dir)
+        hd pieces)
+  in
+  if parents then mkdirhier () else Unix.mkdir dirname dir_perm
 
 let string_of_proc_status = function
   | Unix.WEXITED code -> sprintf "[Exited: %d]" code
@@ -102,7 +202,19 @@ let string_of_proc_status = function
   | Unix.WSTOPPED sg -> sprintf "[Stopped: %d]" sg
 
 let http_get url =
-  try
-    Some (Http_client.Convenience.http_get url)
-  with Http_client.Http_error (code, _) -> None
+  if Pcre.pmatch ~rex:file_scheme_RE url then begin
+      (* file:// URL. Read data from file system *)
+    let fname = Pcre.replace ~rex:file_scheme_RE url in
+    try
+      let size = (Unix.stat fname).Unix.st_size in
+      let buf = String.create size in
+      let ic = open_in fname in
+      really_input ic buf 0 size;
+      close_in ic;
+      Some buf
+    with Unix.Unix_error (Unix.ENOENT, "stat", _) -> None
+  end else  (* other URL, pass it to netclient *)
+    try
+      Some (Http_client.Convenience.http_get url)
+    with Http_client.Http_error (code, _) -> None