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Alias / Absolute (avoid variants) inside Records?
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Author
Topic: Alias / Absolute (avoid variants) inside Records? (Read 884 times)
trn76
New Member
Posts: 40
Alias / Absolute (avoid variants) inside Records?
«
on:
October 30, 2020, 04:39:38 pm »
How can I use Alias / Absolute (avoid variant in records) inside Records? ...or some other neat solution, that would make my day now that I've had some more coffe'!
Code: Pascal
[Select]
[+]
[-]
..
type
Thead_info
=
packed
array
[
0
..
10
-
1
]
of
cuchar
;
Thead_archive
=
packed
array
[
0
..
31
-
1
]
of
cuchar
;
Thead_filename
=
packed
array
[
0
..
256
-
1
]
of
cuchar
;
Thead_comment
=
packed
array
[
0
..
256
-
1
]
of
cuchar
;
PPack
=
^
TPack
;
TPack
=
record
crc
:
cuint
;
sum
:
cuint
;
pack_size
:
cuint
;
unpack_size
:
cuint
;
mode
:
cint
;
year
:
cuint
;
month
:
cuint
;
day
:
cuint
;
hour
:
cuint
;
minute
:
cuint
;
second
:
cuint
;
attributes
:
cuint8
;
//pack_mode : cuint8; // <--- replace this
head_info
:
Thead_info
;
head_archive
:
Thead_archive
;
head_filename
:
Thead_filename
;
head_comment
:
Thead_comment
;
total_pack
:
cuint
;
total_unpack
:
cuint
;
total_files
:
cuint
;
merge_size
:
cuint
;
filFile
:
file
;
filName
:
string
;
filError
:
cuint
;
filList
:
PStringArray
;
nodeList
:
Pnode
;
pack_mode
:
cuint8
absolute
head_archive
[
11
]
;
// <--- with this ?
end
;
Yes I could do this:
Code: Pascal
[Select]
[+]
[-]
procedure
something
;
var
pack
:
TPack
;
mode
:
cuint8
;
begin
// access
mode
:
=
pack
.
head_archive
[
11
]
and
$1F
;
// but this is cleaner:
mode
:
=
pack
.
pack_mode
and
$1F
;
end
;
...hope you get my drift
Logged
ASerge
Hero Member
Posts: 2242
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #1 on:
October 30, 2020, 06:44:45 pm »
Code: Pascal
[Select]
[+]
[-]
{$MODE OBJFPC}
{$MODESWITCH ADVANCEDRECORDS}
type
TheadArchive
=
array
[
0
..
31
-
1
]
of
UInt8
;
TPack
=
record
strict
private
function
GetPackMode
:
UInt8
;
inline
;
public
Attributes
:
Int8
;
HeadArchive
:
TheadArchive
;
filError
:
Cardinal
;
property
PackMode
:
UInt8
read
GetPackMode
;
end
;
function
TPack
.
GetPackMode
:
UInt8
;
begin
Result
:
=
HeadArchive
[
11
]
;
end
;
var
Pack
:
TPack
;
Mode
:
UInt8
;
begin
Mode
:
=
Pack
.
HeadArchive
[
11
]
and
$1F
;
Mode
:
=
Pack
.
PackMode
and
$1F
;
end
.
Code: ASM
[Select]
[+]
[-]
#
[
29
]
Mode
:
= Pack
.
HeadArchive
[
11
]
and
$
1F
;
movw U_
$
P
$
PROJECT1_
$$
_PACK
+
12
(
%
rip
)
,%
ax
andw
$
31
,%
ax
# Var Mode located
in
register
al
.
Ll6
:
#
[
30
]
Mode
:
= Pack
.
PackMode
and
$
1F
;
movw U_
$
P
$
PROJECT1_
$$
_PACK
+
12
(
%
rip
)
,%
ax
andw
$
31
,%
ax
# Var Mode located
in
register
al
Logged
bytebites
Hero Member
Posts: 640
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #2 on:
October 30, 2020, 06:48:53 pm »
Code: Pascal
[Select]
[+]
[-]
{$ModeSwitch advancedrecords}
type
TPack
=
record
....
filError
:
cuint
;
filList
:
PStringArray
;
nodeList
:
Pnode
;
//pack_mode : cuint8; absolute head_archive[11]; // <--- with this ?
function
packmode
:
cuint8
;
end
;
...
function
TPack
.
packmode
:
cuint8
;
begin
result
:
=
pack_size
and
$1f
;
end
;
Logged
marcov
Administrator
Hero Member
Posts: 11453
FPC developer.
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #3 on:
October 30, 2020, 07:16:14 pm »
property packmode : cuint8 read head_archive[11];
Logged
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Tomas Hajny
) »
Alias / Absolute (avoid variants) inside Records?
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