1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
-- 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,
System.Address;
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 System.Address)
return System.Address;
pragma Import (C, asf_open_virtual, "asf_open_virtual");
----------------------
-- Callback Hooks --
----------------------
function Ada_Filelen_Hook
(Data : in System.Address)
return Interfaces.Integer_64
is
Virtual : Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (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 System.Address)
return Interfaces.Integer_64
is
Virtual : Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (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 System.Address;
Count : in Interfaces.Integer_64;
Data : in System.Address)
return Interfaces.Integer_64
is
Virtual : Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Data);
Buffer : Raw_Data (1 .. Integer (Count));
for Buffer'Address use 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 System.Address;
Count : in Interfaces.Integer_64;
Data : in System.Address)
return Interfaces.Integer_64
is
Virtual : Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (Data);
Buffer : Raw_Data (1 .. Integer (Count));
for Buffer'Address use 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 System.Address)
return Interfaces.Integer_64
is
Virtual : Virt_Conversions.Object_Pointer :=
Virt_Conversions.To_Pointer (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 : Interfaces.C.int := (case Mode is
when Read_Only => sfm_read,
when Write_Only => sfm_write,
when Read_Write => sfm_rdwr);
Result : System.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, File.My_Virtual'Address);
if Result = System.Null_Address 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;
|
