package gapi-ocaml
A simple OCaml client for Google Services
Install
Dune Dependency
Authors
Maintainers
Sources
v0.4.6.tar.gz
sha256=b84b680528a5e050014103a8e7a60a5d43efd5fefc3f838310bd46769775ab48
md5=8ee26acf1f6c6f5e24c7b57fa070a0a2
doc/src/gapi-ocaml.netstring-local/netstream.ml.html
Source file netstream.ml
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(* $Id$ * ---------------------------------------------------------------------- * *) open Netchannels;; class type in_obj_stream = object inherit Netchannels.in_obj_channel method block_size : int method window : Netbuffer.t method want : int -> unit method want_another_block : unit -> unit method window_length : int method window_at_eof : bool method skip : int -> unit end class virtual input_methods init_s_netbuf = object(self) val mutable s_pos = 0 val mutable s_at_eof = false val s_netbuf = init_s_netbuf val mutable s_closed = false method virtual want : int -> unit method virtual want_another_block : unit -> unit method virtual window_length : int method virtual input : Bytes.t -> int -> int -> int (* The following input methods base all on [input] *) method really_input buf pos len = if s_closed then raise Netchannels.Closed_channel; let rec read p = let l = self # input buf (pos+p) (len-p) in let p' = p + l in if p' = len then () else ( if l=0 then raise Sys_blocked_io; read p' ) in self # want len; (* may raise Buffer_underrun *) read 0 method really_input_string len = let buf = Bytes.create len in self # really_input buf 0 len; Bytes.unsafe_to_string buf method input_char () = let s = Bytes.create 1 in self # really_input s 0 1; Bytes.get s 0 method input_byte () = let s = Bytes.create 1 in self # really_input s 0 1; int_of_char (Bytes.get s 0) method input_line () = (* CHECK: Are the different end of line conventions important here? *) let rec find_eol() = try Netbuffer.index_from s_netbuf 0 '\n' (* or Not_found *) with Not_found -> if not s_at_eof then begin self # want_another_block(); (* may raise Buffer_underrun *) find_eol() end else self#window_length in if s_closed then raise Netchannels.Closed_channel; let n = find_eol() in if n >= self#window_length then begin if n = 0 then raise End_of_file; self#really_input_string n end else begin let s = self#really_input_string n in ignore(self#input_char()); (* '\n' *) s end method pos_in = if s_closed then raise Netchannels.Closed_channel; s_pos end class input_stream ?len ?(block_size = 4096) in_ch : in_obj_stream = object (self) val s_channel = (in_ch : in_obj_channel) val s_maxlength = len val s_blocksize = block_size val mutable s_underrun = false inherit input_methods (Netbuffer.create block_size) (* Note: This implementation must even work if [in_ch] is a pipe, * and raises Buffer_underrun from time to time. This may happen * at inconvenient situations. In this case the flag s_underrun stores * whether an underrun happened, and should be reported later. *) initializer try self # want_minimum() (* may raise Buffer_underrun *) with Buffer_underrun -> s_underrun <- true method private debug msg = prerr_endline (msg ^ ": s_pos=" ^ string_of_int s_pos ^ " s_at_eof=" ^ string_of_bool s_at_eof ^ " buflen=" ^ string_of_int (Netbuffer.length s_netbuf) ^ " s_closed=" ^ string_of_bool s_closed); method block_size = s_blocksize (* The block size is a static property, so never raise Closed_channel *) method window = if s_closed then raise Netchannels.Closed_channel; s_netbuf method window_length = if s_closed then raise Netchannels.Closed_channel; Netbuffer.length s_netbuf method window_at_eof = if s_closed then raise Netchannels.Closed_channel; s_at_eof method want_another_block() = if s_closed then raise Netchannels.Closed_channel; if not s_at_eof then begin (* How much are we allowed to read? *) let m = match s_maxlength with None -> s_blocksize | Some l -> min (l - s_pos - Netbuffer.length s_netbuf) s_blocksize in assert(m >= 0); (* Try to read m bytes: *) let rec read_block k = if k < m then let n = Netbuffer.add_inplace ~len:(m-k) s_netbuf (s_channel # input) (* may raise End_of_file, Buffer_underrun *) in ( if n > 0 then read_block (k+n) else raise Sys_blocked_io ) else () in try if m=0 then (* Artificial EOF because len is reached *) s_at_eof <- true else read_block 0 with End_of_file -> s_at_eof <- true end; (* self # debug "after stream#want_another_block"; *) (* Unix.sleep 1; *) method want n = if s_closed then raise Netchannels.Closed_channel; while not s_at_eof && Netbuffer.length s_netbuf < n do self # want_another_block() done method private want_minimum() = self # want s_blocksize method skip len = if s_closed then raise Netchannels.Closed_channel; let rec read len = if len > 0 then begin let k = min (Netbuffer.length s_netbuf) len in Netbuffer.delete s_netbuf 0 k; s_pos <- s_pos + k; self # want_minimum(); (* may raise Buffer_underrun *) if k > 0 then read (len - k) end in read len method input buf pos len = if s_closed then raise Netchannels.Closed_channel; if s_underrun then ( self # want_minimum(); (* may raise Buffer_underrun *) s_underrun <- false; ); (* Assertion: Either window length >= minimum, or eof *) let len' = min len (Netbuffer.length s_netbuf) in Netbuffer.blit s_netbuf 0 buf pos len'; Netbuffer.delete s_netbuf 0 len'; s_pos <- s_pos + len'; ( try self # want_minimum(); (* may raise Buffer_underrun *) with Buffer_underrun -> s_underrun <- true ); if len'=0 && len>0 then raise End_of_file; len' method close_in () = if not s_closed then ( s_channel # close_in(); s_closed <- true; ) end (* let find_prefix s1 pos len s2 = (* Checks where a non-empty prefix of [s2] occurs at the end of the substring * of [s1] beginning at [pos] with length [len]. The function returns * the position [p] of the prefix in [s1]. * The function raises Not_found if it does not find a prefix. * POSTCONDITION: * - s1[p..p+n-1] = s2[0..n-1] for some biggest n, n <= String.length s2 * "The string s1 contains the prefix of s2 at position p, and the * prefix has the maximum length n." * - n < String.length s2 ==> p+n = String.length s1 * "If the prefix is a proper prefix, it occurs at the end of s1" *) assert(String.length s2 > 0); let l1 = min (String.length s1) (pos+len) in let l2 = String.length s2 in let s2c0 = s2.[0] in let rec check_rec p k = k >= l2 || p+k >= l1 || (s1.[p+k] = s2.[k] && check_rec p (k+1)) in let rec search_rec p = if p >= l1 then raise Not_found; let p' = String.index_from s1 p s2c0 in (* or Not_found *) if p' >= l1 then raise Not_found; if check_rec p' 0 then p' else search_rec (p'+1) in search_rec pos ;; *) class sub_stream ?len ?delimiter in_stream : in_obj_stream = object(self) val s = (in_stream : in_obj_stream) val mutable s_winlen = 0 val mutable s_del = None (* initialized below *) val s_len = len val mutable s_underrun = false inherit input_methods (in_stream # window) initializer (match delimiter with Some "" -> invalid_arg "new Netstream.sub_stream"; | Some d -> s_del <- Some(d, Netaux.KMP.make_pattern d) | None -> s_del <- None ); (match s_len with Some l -> if l<0 then invalid_arg "new Netstream.sub_stream"; | None -> () ); try self # want_minimum() with Buffer_underrun -> s_underrun <- true method block_size = s # block_size method window = if s_closed then raise Netchannels.Closed_channel; s_netbuf method window_length = if s_closed then raise Netchannels.Closed_channel; s_winlen method window_at_eof = if s_closed then raise Netchannels.Closed_channel; s_at_eof method private compute_winlen() = (* sets [s_winlen], [s_at_eof], and returns whether the current window * is "ambigous" (it is not clear if the stream does end or does not * end) *) let ambigous = ref false in let w = s#window in let wlen = s#window_length in let weof = s#window_at_eof in begin match s_del with None -> s_winlen <- wlen; s_at_eof <- weof; | Some(d,pat) -> let p = Netaux.KMP.find_pattern pat ~len:wlen (Netbuffer.unsafe_buffer w) in if p >= wlen then begin (* Delimiter d does not occur in the buffer *) s_winlen <- wlen; s_at_eof <- weof; end else if (p + String.length d) > wlen then begin (* Case: prefix is a proper prefix *) ambigous := not weof; s_winlen <- wlen; s_at_eof <- weof; end else begin (* Case: [d] occurs in the window *) s_winlen <- p; s_at_eof <- true; end end; begin match s_len with None -> () | Some l -> if l - s_pos < s_winlen then begin ambigous := false; s_winlen <- l - s_pos; s_at_eof <- true; end end; !ambigous method want_another_block() = if s_closed then raise Netchannels.Closed_channel; s # want_another_block(); (* may raise Buffer_underrun *) while self # compute_winlen() do s # want_another_block(); (* may raise Buffer_underrun *) done method want n = if s_closed then raise Netchannels.Closed_channel; while not s_at_eof && s_winlen < n do self # want_another_block() (* may raise Buffer_underrun *) done method private want_minimum() = if self # compute_winlen() then self # want_another_block(); (* may raise Buffer_underrun *) self # want s#block_size method skip len = if s_closed then raise Netchannels.Closed_channel; let rec read len = if len > 0 then begin let k = min s_winlen len in s # skip k; (* may raise Buffer_underrun *) s_pos <- s_pos + k; self # want_minimum(); (* may raise Buffer_underrun *) if k > 0 then read (len - k) end in read len method input buf pos len = if s_closed then raise Netchannels.Closed_channel; if s_underrun then ( self # want_minimum(); (* may raise Buffer_underrun *) s_underrun <- false; ); (* Assertion: Either window length >= minimum, or eof *) let len' = min len s_winlen in Netbuffer.blit s_netbuf 0 buf pos len'; s # skip len'; (* never raises Buffer_underrun *) s_pos <- s_pos + len'; ( try self # want_minimum(); with Buffer_underrun -> s_underrun <- true ); if len'=0 && len>0 then raise End_of_file; len' method close_in () = if not s_closed then ( s # close_in(); s_closed <- true; ) end let print_in_obj_stream fmt s = Format.fprintf fmt "<NETSTREAM pos_in:%d window_length:%d eof=%b>" s#pos_in s#window_length s#window_at_eof ;;
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