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package body Crypto.Types.Random_Source.File is
use Ada.Strings.Unbounded;
use Ada.Streams.Stream_IO;
---------------------------------------------------------------------------
------------------------ Initialization -----------------------------------
---------------------------------------------------------------------------
procedure Initialize(This : in out Random_Source_File) is
Path : constant String := "/dev/random";
Mode : constant File_Mode := In_File;
begin
if This.Source_File = null then
This.Source_File := new Ada.Streams.Stream_IO.File_Type;
end if;
if not Is_Open(This.Source_File.all) then
Open(This.Source_File.all, Mode, Path, "shared=yes");
This.Source_Path := To_Unbounded_String(Path);
end if;
end Initialize;
---------------------------------------------------------------------------
procedure Initialize(This : in out Random_Source_File;
File_Path : in String) is
Mode : constant File_Mode := In_File;
begin
if Is_Open(This.Source_File.all) then
Close(This.Source_File.all);
end if;
if not Is_Open(This.Source_File.all) then
Open(This.Source_File.all, Mode, File_Path, "shared=yes");
This.Source_Path := To_Unbounded_String(File_Path);
end if;
end Initialize;
---------------------------------------------------------------------------
------------------------------- Read Byte ---------------------------------
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; B : out Byte) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
Byte'Read(Stream(This.Source_File.all), B);
end if;
end Read;
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; Byte_Array : out Bytes) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
Bytes'Read(Stream(This.Source_File.all), Byte_Array);
end if;
end Read;
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; B : out B_Block128) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
B_Block128'Read(Stream(This.Source_File.all), B);
end if;
end Read;
---------------------------------------------------------------------------
------------------------------- Read Word ---------------------------------
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; W : out Word) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
Word'Read(Stream(This.Source_File.all), W);
end if;
end Read;
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; Word_Array : out Words) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
Words'Read(Stream(This.Source_File.all), Word_Array);
end if;
end Read;
---------------------------------------------------------------------------
------------------------------- Read DWord --------------------------------
---------------------------------------------------------------------------
procedure Read(This : in out Random_Source_File; D : out DWord) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
DWord'Read(Stream(This.Source_File.all), D);
end if;
end Read;
procedure Read(This : in out Random_Source_File; DWord_Array : out DWords) is
begin
if not Path_Starts_With(This, "/dev/") and then End_Of_File(This.Source_File.all) then
raise RANDOM_SOURCE_READ_ERROR with To_String(This.Source_Path);
else
DWords'Read(Stream(This.Source_File.all), DWord_Array);
end if;
end Read;
---------------------------------------------------------------------------
------------------------------- Finalize ----------------------------------
---------------------------------------------------------------------------
procedure Finalize(This : in out Random_Source_File) is
begin
if Is_Open(This.Source_File.all) then
Close(This.Source_File.all);
end if;
end Finalize;
---------------------------------------------------------------------------
--------------------------- Path_Starts_With ------------------------------
---------------------------------------------------------------------------
function Path_Starts_With(This : Random_Source_File; S : String) return Boolean is
Path : constant String := To_String(This.Source_Path);
begin
return Path(Path'First..S'Last) = S;
end;
end Crypto.Types.Random_Source.File;
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