(*************************************************************************)
(* This program is free software: you can redistribute it and/or modify *)
(* it under the terms of the version 3 of the GNU General Public License *)
(* as published by the Free Software Foundation. *)
(* *)
(* This program is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
(* General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU General Public License *)
(* along with this program. If not, see . *)
(* *)
(* Written and (C) by Francois Fleuret *)
(* Contact for comments & bug reports *)
(*************************************************************************)
let buffer_length = 4096
exception Network_error of string
let bytes_of_int n =
let s = "0000" in
String.set s 3 (char_of_int (n land 255));
String.set s 2 (char_of_int ((n lsr 8) land 255));
String.set s 1 (char_of_int ((n lsr 16) land 255));
String.set s 0 (char_of_int ((n lsr 24) land 255));
s;;
let int_of_bytes s =
try
int_of_char (String.get s 3) +
256 * (int_of_char (String.get s 2) +
256 * (int_of_char (String.get s 1) +
256 * int_of_char (String.get s 0)))
with
_ -> -1;;
(* What a shame that I have to do this ... *)
let dot_to_number s =
let rec decode_rec k =
try
let l = String.index_from s k '.' in (int_of_string (String.sub s k (l-k)))::(decode_rec (l+1))
with
Not_found -> [ int_of_string (String.sub s k ((String.length s) - k)) ]
in
let k = List.fold_left (fun x y -> Int64.add (Int64.mul (Int64.of_int 256) x) (Int64.of_int y)) Int64.zero (decode_rec 0)
in Int64.to_string k;;
let connect (hostname: string) (port: int) =
try
let s = Unix.socket Unix.PF_INET Unix.SOCK_STREAM 0 in
Unix.connect s (Unix.ADDR_INET(((Unix.gethostbyname hostname).Unix.h_addr_list).(0), port));
s
with
Not_found -> raise (Network_error("Unknown host " ^ hostname))
| Unix.Unix_error(e, fname, fparam) -> raise (Network_error(fname ^ ": " ^ Unix.error_message(e)))
let listen port =
try
let s = Unix.socket Unix.PF_INET Unix.SOCK_STREAM 0 in
Unix.bind s (Unix.ADDR_INET(Unix.inet_addr_any, port));
Unix.listen s 4;
s
with
Unix.Unix_error(e, fname, fparam) -> raise (Network_error(fname ^ ": " ^ Unix.error_message(e)))
type rstream = { rdescr: Unix.file_descr; buffer: string; mutable pos: int }
let read_lines (rc: rstream) (reader: string -> unit) =
try
(* We read as much available characters as we can to fill up the
buffer *)
let s = Unix.read rc.rdescr rc.buffer rc.pos (buffer_length - rc.pos) in
if s <= 0
then raise (Network_error((string_of_int s) ^ " character(s) read"))
else rc.pos <- rc.pos + s;
(* the 'read' function applies the reader to the new lines we got,
starting at character 'current' *)
let rec read current =
try
(* if we are already after the end, finish *)
if(current >= rc.pos) then raise Not_found;
(* Look for a \n in the remaining part of the buffer *)
let cr = (String.index_from rc.buffer current '\n') in
(* If it is afte`r the 'fresh' data, it means we do not have \n
remaining, raise a Not_found *)
if (cr >= rc.pos) then raise Not_found;
(* We have found a \n, applies the reader to the line it ends *)
reader (String.sub rc.buffer current (cr - current));
read (cr+1)
with
(* No more lines in the buffer *)
Not_found ->
(* moves the remaining characters to the beginning of the buffer *)
if(current < rc.pos) then String.blit rc.buffer current rc.buffer 0 (rc.pos - current);
(* refreshes the index where to put next incoming characters *)
rc.pos <- (rc.pos - current);
in read 0
with
Unix.Unix_error(e, fname, fparam) -> raise (Network_error (fname ^ ": " ^ (Unix.error_message e)))
let linizer = fun (d: Unix.file_descr) (reader: string -> unit) () ->
read_lines { rdescr = d; buffer = String.create buffer_length; pos = 0 } reader;;
let read_binary (fd: Unix.file_descr) (reader: string -> unit) =
try
let buffer = String.create buffer_length in
let s = Unix.read fd buffer 0 buffer_length in
if s <= 0
then raise (Network_error((string_of_int s) ^ " character(s) read"));
reader (String.sub buffer 0 s)
with
Unix.Unix_error(e, fname, fparam) -> raise (Network_error (fname ^ ": " ^ (Unix.error_message e)));;
let binarizer = fun (d: Unix.file_descr) (reader: string -> unit) () -> read_binary d reader;;
(******************************************************************************)
(* A tokenizer takes a string and a separator and returns two functions *)
(* unit -> string, the first returning the tokens one after another, and the *)
(* second returning the remaining part of the string. *)
(******************************************************************************)
let (tokenizer: string -> char -> (unit -> string) * (unit -> string)) = fun line c ->
let index = ref 0 in
let token () = let n = !index in
try
let m = (String.index_from line n c) in
index := m + 1;
while !index < (String.length line) && (String.get line !index = c) do index := !index+1; done;
String.sub (line) n (m - n)
with
Not_found -> if !index < (String.length line)
then begin
index := (String.length line);
String.sub (line) n (!index - n)
end
else raise Not_found
and tail () =
if !index < (String.length line)
then let n = !index in (index := (String.length line); String.sub (line) n (!index - n))
else raise Not_found
in (token, tail);;