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-- Programmed by Jedidiah Barber
-- Released into the public domain
pragma Ada_2012;
with
Interfaces.C,
System.Address_To_Access_Conversions;
use type
Interfaces.C.int;
package body Libsndfile.Virtual is
package Virt_Conversions is new System.Address_To_Access_Conversions (Virtual_Data);
------------------------
-- Functions From C --
------------------------
function asf_open_virtual
(Mode : in Interfaces.C.int;
Sfinfo : in out C_File_Info;
Data : in Storage.Integer_Address)
return Storage.Integer_Address;
pragma Import (C, asf_open_virtual, "asf_open_virtual");
----------------------
-- Callback Hooks --
----------------------
function Ada_Filelen_Hook
(Data : in Storage.Integer_Address)
return Interfaces.Integer_64
is
Virtual : constant Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Storage.To_Address (Data));
begin
return Interfaces.Integer_64 (Virtual.My_Length.all);
end Ada_Filelen_Hook;
function Ada_Seek_Hook
(Offset : in Interfaces.Integer_64;
Whence : in Interfaces.C.int;
Data : in Storage.Integer_Address)
return Interfaces.Integer_64
is
Virtual : constant Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Storage.To_Address (Data));
My_Whence : Seek_From;
begin
if Whence = sf_seek_set then
My_Whence := From_Start;
elsif Whence = sf_seek_cur then
My_Whence := From_Current;
elsif Whence = sf_seek_end then
My_Whence := From_End;
else
raise Program_Error;
end if;
return Interfaces.Integer_64 (Virtual.My_Seek.all (Count_Type (Offset), My_Whence));
end Ada_Seek_Hook;
function Ada_Read_Hook
(Ptr : in Storage.Integer_Address;
Count : in Interfaces.Integer_64;
Data : in Storage.Integer_Address)
return Interfaces.Integer_64
is
Virtual : constant Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Storage.To_Address (Data));
Buffer : Raw_Data (1 .. Integer (Count));
for Buffer'Address use Storage.To_Address (Ptr);
pragma Import (Ada, Buffer);
begin
return Interfaces.Integer_64 (Virtual.My_Read (Buffer, Count_Type (Count)));
end Ada_Read_Hook;
function Ada_Write_Hook
(Ptr : in Storage.Integer_Address;
Count : in Interfaces.Integer_64;
Data : in Storage.Integer_Address)
return Interfaces.Integer_64
is
Virtual : constant Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Storage.To_Address (Data));
Buffer : Raw_Data (1 .. Integer (Count));
for Buffer'Address use Storage.To_Address (Ptr);
pragma Import (Ada, Buffer);
begin
return Interfaces.Integer_64 (Virtual.My_Write (Buffer, Count_Type (Count)));
end Ada_Write_Hook;
function Ada_Tell_Hook
(Data : in Storage.Integer_Address)
return Interfaces.Integer_64
is
Virtual : constant Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Storage.To_Address (Data));
begin
return Interfaces.Integer_64 (Virtual.My_Tell.all);
end Ada_Tell_Hook;
---------------------
-- API Interface --
---------------------
procedure Open
(File : in out Virtual_Sound_File;
Mode : in File_Mode;
Info : in out File_Info'Class;
Length : in File_Length_Function;
Seek : in Seek_Function;
Read : in Read_Function;
Write : in Write_Function;
Tell : in Tell_Function)
is
Mode_Int : constant Interfaces.C.int := (case Mode is
when Read_Only => sfm_read,
when Write_Only => sfm_write,
when Read_Write => sfm_rdwr);
Result : Storage.Integer_Address;
begin
File.My_Virtual.My_Length := Length;
File.My_Virtual.My_Seek := Seek;
File.My_Virtual.My_Read := Read;
File.My_Virtual.My_Write := Write;
File.My_Virtual.My_Tell := Tell;
Result := asf_open_virtual
(Mode_Int, Info.Data, Storage.To_Integer (File.My_Virtual'Address));
if Result = Null_Pointer then
Raise_Error (sf_error (Result));
raise Program_Error;
else
File.Ptr := Result;
File.FMode := Mode;
File.Chans := Info.Data.My_Channels;
end if;
end Open;
end Libsndfile.Virtual;
|
