/usr/share/ada/adainclude/aws/aws-net-buffered.adb is in libaws2.10.2-dev 2.10.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Ada Web Server --
-- --
-- Copyright (C) 2002-2010, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or (at --
-- your option) any later version. --
-- --
-- This library 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 library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
------------------------------------------------------------------------------
with AWS.Containers.Memory_Streams;
with AWS.Default;
with AWS.Translator;
package body AWS.Net.Buffered is
CRLF : constant Stream_Element_Array :=
Translator.To_Stream_Element_Array (ASCII.CR & ASCII.LF);
Input_Limit : Stream_Element_Offset := AWS.Default.Input_Line_Size_Limit;
pragma Atomic (Input_Limit);
procedure Read (Socket : Socket_Type'Class);
-- Refill the read-cache, the cache must be empty before the call
function Is_Empty (C : Read_Cache) return Boolean;
pragma Inline (Is_Empty);
-----------
-- Flush --
-----------
procedure Flush (Socket : Socket_Type'Class) is
C : Write_Cache renames Socket.C.W_Cache;
begin
if C.Last > 0 then
Send (Socket, C.Buffer (1 .. C.Last));
C.Last := 0;
end if;
end Flush;
--------------
-- Get_Char --
--------------
function Get_Char (Socket : Socket_Type'Class) return Character is
C : Read_Cache renames Socket.C.R_Cache;
Char : Character;
begin
if Is_Empty (C) then
Read (Socket);
end if;
Char := Character'Val (C.Buffer (C.First));
C.First := C.First + 1;
return Char;
end Get_Char;
---------------------
-- Get_Input_Limit --
---------------------
function Get_Input_Limit return Stream_Element_Offset is
begin
return Input_Limit;
end Get_Input_Limit;
--------------
-- Get_Line --
--------------
function Get_Line (Socket : Socket_Type'Class) return String is
Line : constant String := Read_Until (Socket, "" & ASCII.LF, True);
begin
if Line'Length > 0 and then Line (Line'Last) = ASCII.LF then
if Line'Length > 1 and then Line (Line'Last - 1) = ASCII.CR then
return Line (Line'First .. Line'Last - 2);
else
return Line (Line'First .. Line'Last - 1);
end if;
else
return Line;
end if;
end Get_Line;
--------------
-- Is_Empty --
--------------
function Is_Empty (C : Read_Cache) return Boolean is
begin
return C.First > C.Last;
end Is_Empty;
--------------
-- New_Line --
--------------
procedure New_Line (Socket : Socket_Type'Class) is
begin
Write (Socket, CRLF);
end New_Line;
---------------
-- Peek_Char --
---------------
function Peek_Char (Socket : Socket_Type'Class) return Character is
C : Read_Cache renames Socket.C.R_Cache;
begin
if Is_Empty (C) then
Read (Socket);
end if;
return Character'Val (Natural (C.Buffer (C.First)));
end Peek_Char;
---------
-- Put --
---------
procedure Put (Socket : Socket_Type'Class; Item : String) is
begin
Write (Socket, Translator.To_Stream_Element_Array (Item));
end Put;
--------------
-- Put_Line --
--------------
procedure Put_Line (Socket : Socket_Type'Class; Item : String) is
begin
Write (Socket, Translator.To_Stream_Element_Array (Item) & CRLF);
end Put_Line;
----------
-- Read --
----------
procedure Read (Socket : Socket_Type'Class) is
C : Read_Cache renames Socket.C.R_Cache;
begin
Receive (Socket, C.Buffer, C.Last);
-- Reset C.First only after successful Receive, the buffer would
-- remain empty on timeout this way.
C.First := C.Buffer'First;
end Read;
procedure Read
(Socket : Socket_Type'Class;
Data : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
C : Read_Cache renames Socket.C.R_Cache;
begin
Flush (Socket);
if Is_Empty (C) then
if Data'Length < C.Buffer'Length then
-- If Data fit in the cache, fill it
Read (Socket);
else
-- Otherwise read the socket directly
Receive (Socket, Data, Last);
return;
end if;
end if;
Read_Buffer (Socket, Data, Last);
-- Data could remain in internal socket buffer, if there is some
-- space on the buffer, read the socket.
if Last < Data'Last and then Pending (Socket) > 0 then
Receive (Socket, Data (Last + 1 .. Data'Last), Last);
end if;
end Read;
function Read
(Socket : Socket_Type'Class;
Max : Stream_Element_Count := 4096) return Stream_Element_Array
is
Buffer : Stream_Element_Array (1 .. Max);
Last : Stream_Element_Offset;
begin
Read (Socket, Buffer, Last);
return Buffer (1 .. Last);
end Read;
procedure Read
(Socket : Socket_Type'Class; Data : out Stream_Element_Array)
is
Last : Stream_Element_Offset;
First : Stream_Element_Offset := Data'First;
begin
loop
Read (Socket, Data (First .. Data'Last), Last);
exit when Last = Data'Last;
First := Last + 1;
end loop;
end Read;
-----------------
-- Read_Buffer --
-----------------
procedure Read_Buffer
(Socket : Socket_Type'Class;
Data : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
C : Read_Cache renames Socket.C.R_Cache;
C_Last : constant Stream_Element_Offset :=
Stream_Element_Offset'Min (C.Last, C.First + Data'Length - 1);
begin
Last := Data'First + C_Last - C.First;
Data (Data'First .. Last) := C.Buffer (C.First .. C_Last);
C.First := C_Last + 1;
end Read_Buffer;
----------------
-- Read_Until --
----------------
function Read_Until
(Socket : Socket_Type'Class;
Delimiter : Stream_Element_Array;
Wait : Boolean := True) return Stream_Element_Array
is
use Containers.Memory_Streams;
function Buffered return Stream_Element_Array;
pragma Inline (Buffered);
procedure Finalize;
Finalizer : Utils.Finalizer (Finalize'Access);
pragma Unreferenced (Finalizer);
Buffer : Stream_Type;
--------------
-- Buffered --
--------------
function Buffered return Stream_Element_Array is
Result : Stream_Element_Array (1 .. Size (Buffer));
Last : Stream_Element_Offset;
begin
Read (Buffer, Result, Last);
return Result;
end Buffered;
--------------
-- Finalize --
--------------
procedure Finalize is
begin
Close (Buffer);
end Finalize;
C : Read_Cache renames Socket.C.R_Cache;
J, K : Stream_Element_Offset;
begin
if Wait then
Flush (Socket);
end if;
J := C.First;
K := Delimiter'First;
loop
if J > C.Last then
if Wait then
Append (Buffer, C.Buffer (C.First .. C.Last));
if Size (Buffer) > Input_Limit then
raise Data_Overflow with
"Size" & Stream_Element_Offset'Image (Size (Buffer));
end if;
begin
Read (Socket);
exception
when E : Socket_Error =>
if Size (Buffer) = 0 or else Is_Timeout (Socket, E) then
raise;
else
C.First := 1;
C.Last := 0;
return Buffered;
end if;
end;
J := C.First;
else
return (1 .. 0 => 0);
end if;
end if;
if C.Buffer (J) = Delimiter (K) then
if K = Delimiter'Last then
K := C.First;
C.First := J + 1;
return Buffered & C.Buffer (K .. J);
else
K := K + 1;
end if;
J := J + 1;
elsif K = Delimiter'First then
J := J + 1;
else
K := Delimiter'First;
end if;
end loop;
end Read_Until;
function Read_Until
(Socket : Socket_Type'Class;
Delimiter : String;
Wait : Boolean := True) return String is
begin
return Translator.To_String
(Read_Until
(Socket, Translator.To_Stream_Element_Array (Delimiter), Wait));
end Read_Until;
---------------------
-- Set_Input_Limit --
---------------------
procedure Set_Input_Limit (Limit : Positive) is
begin
Input_Limit := Stream_Element_Offset (Limit);
end Set_Input_Limit;
--------------
-- Shutdown --
--------------
procedure Shutdown (Socket : Socket_Type'Class) is
begin
begin
Flush (Socket);
exception
when Socket_Error =>
-- Ignore recent cache buffer send error
null;
end;
Net.Shutdown (Socket);
end Shutdown;
-----------
-- Write --
-----------
procedure Write
(Socket : Socket_Type'Class;
Item : Stream_Element_Array)
is
C : Write_Cache renames Socket.C.W_Cache;
Next_Last : constant Stream_Element_Offset := C.Last + Item'Length;
begin
if Next_Last > C.Max_Size then
Send (Socket, C.Buffer (1 .. C.Last) & Item);
C.Last := 0;
else
C.Buffer (C.Last + 1 .. Next_Last) := Item;
C.Last := Next_Last;
end if;
end Write;
end AWS.Net.Buffered;
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