Commit 252fdb44 authored by Martin Schreiber's avatar Martin Schreiber

+ swapbits().

+ msecrc.
parent ff0ec1a1
{ MSEgui Copyright (c) 2012 by Martin Schreiber
See the file COPYING.MSE, included in this distribution,
for details about the copyright.
This program 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.
}
unit msecrc;
{$ifdef FPC}{$mode objfpc}{$h+}{$endif}
interface
function crc32(const data: pbyte; const length: integer): longword; overload;
procedure crc32(const data: pbyte; const length: integer; var crc: longword);
implementation
const
crc32table: array[byte] of longword = (
$00000000,$77073096,$EE0E612C,$990951BA,
$076DC419,$706AF48F,$E963A535,$9E6495A3,
$0EDB8832,$79DCB8A4,$E0D5E91E,$97D2D988,
$09B64C2B,$7EB17CBD,$E7B82D07,$90BF1D91,
$1DB71064,$6AB020F2,$F3B97148,$84BE41DE,
$1ADAD47D,$6DDDE4EB,$F4D4B551,$83D385C7,
$136C9856,$646BA8C0,$FD62F97A,$8A65C9EC,
$14015C4F,$63066CD9,$FA0F3D63,$8D080DF5,
$3B6E20C8,$4C69105E,$D56041E4,$A2677172,
$3C03E4D1,$4B04D447,$D20D85FD,$A50AB56B,
$35B5A8FA,$42B2986C,$DBBBC9D6,$ACBCF940,
$32D86CE3,$45DF5C75,$DCD60DCF,$ABD13D59,
$26D930AC,$51DE003A,$C8D75180,$BFD06116,
$21B4F4B5,$56B3C423,$CFBA9599,$B8BDA50F,
$2802B89E,$5F058808,$C60CD9B2,$B10BE924,
$2F6F7C87,$58684C11,$C1611DAB,$B6662D3D,
$76DC4190,$01DB7106,$98D220BC,$EFD5102A,
$71B18589,$06B6B51F,$9FBFE4A5,$E8B8D433,
$7807C9A2,$0F00F934,$9609A88E,$E10E9818,
$7F6A0DBB,$086D3D2D,$91646C97,$E6635C01,
$6B6B51F4,$1C6C6162,$856530D8,$F262004E,
$6C0695ED,$1B01A57B,$8208F4C1,$F50FC457,
$65B0D9C6,$12B7E950,$8BBEB8EA,$FCB9887C,
$62DD1DDF,$15DA2D49,$8CD37CF3,$FBD44C65,
$4DB26158,$3AB551CE,$A3BC0074,$D4BB30E2,
$4ADFA541,$3DD895D7,$A4D1C46D,$D3D6F4FB,
$4369E96A,$346ED9FC,$AD678846,$DA60B8D0,
$44042D73,$33031DE5,$AA0A4C5F,$DD0D7CC9,
$5005713C,$270241AA,$BE0B1010,$C90C2086,
$5768B525,$206F85B3,$B966D409,$CE61E49F,
$5EDEF90E,$29D9C998,$B0D09822,$C7D7A8B4,
$59B33D17,$2EB40D81,$B7BD5C3B,$C0BA6CAD,
$EDB88320,$9ABFB3B6,$03B6E20C,$74B1D29A,
$EAD54739,$9DD277AF,$04DB2615,$73DC1683,
$E3630B12,$94643B84,$0D6D6A3E,$7A6A5AA8,
$E40ECF0B,$9309FF9D,$0A00AE27,$7D079EB1,
$F00F9344,$8708A3D2,$1E01F268,$6906C2FE,
$F762575D,$806567CB,$196C3671,$6E6B06E7,
$FED41B76,$89D32BE0,$10DA7A5A,$67DD4ACC,
$F9B9DF6F,$8EBEEFF9,$17B7BE43,$60B08ED5,
$D6D6A3E8,$A1D1937E,$38D8C2C4,$4FDFF252,
$D1BB67F1,$A6BC5767,$3FB506DD,$48B2364B,
$D80D2BDA,$AF0A1B4C,$36034AF6,$41047A60,
$DF60EFC3,$A867DF55,$316E8EEF,$4669BE79,
$CB61B38C,$BC66831A,$256FD2A0,$5268E236,
$CC0C7795,$BB0B4703,$220216B9,$5505262F,
$C5BA3BBE,$B2BD0B28,$2BB45A92,$5CB36A04,
$C2D7FFA7,$B5D0CF31,$2CD99E8B,$5BDEAE1D,
$9B64C2B0,$EC63F226,$756AA39C,$026D930A,
$9C0906A9,$EB0E363F,$72076785,$05005713,
$95BF4A82,$E2B87A14,$7BB12BAE,$0CB61B38,
$92D28E9B,$E5D5BE0D,$7CDCEFB7,$0BDBDF21,
$86D3D2D4,$F1D4E242,$68DDB3F8,$1FDA836E,
$81BE16CD,$F6B9265B,$6FB077E1,$18B74777,
$88085AE6,$FF0F6A70,$66063BCA,$11010B5C,
$8F659EFF,$F862AE69,$616BFFD3,$166CCF45,
$A00AE278,$D70DD2EE,$4E048354,$3903B3C2,
$A7672661,$D06016F7,$4969474D,$3E6E77DB,
$AED16A4A,$D9D65ADC,$40DF0B66,$37D83BF0,
$A9BCAE53,$DEBB9EC5,$47B2CF7F,$30B5FFE9,
$BDBDF21C,$CABAC28A,$53B39330,$24B4A3A6,
$BAD03605,$CDD70693,$54DE5729,$23D967BF,
$B3667A2E,$C4614AB8,$5D681B02,$2A6F2B94,
$B40BBE37,$C30C8EA1,$5A05DF1B,$2D02EF8D
);
procedure crc32(const data: pbyte; const length: integer; var crc: longword);
var
po1,po2: pbyte;
lwo1: longword;
begin
if length > 0 then begin
lwo1:= not crc; //startvector
po1:= data;
po2:= data+length;
while po1 < po2 do begin
lwo1:= (lwo1 shr 8) xor crc32table[byte(lwo1) xor po1^];
inc(po1)
end;
crc:= not lwo1;
end;
end;
function crc32(const data: pbyte; const length: integer): longword;
begin
result:= 0;
crc32(data,length,result);
end;
end.
......@@ -156,6 +156,14 @@ function swapbytes(const value: longword): longword; overload;
//value and result at different adresses!
procedure swapbytes1(var value: word); overload;
procedure swapbytes1(var value: longword); overload;
function swapbits(const value: word): word; overload;
//value and result at different adresses!
function swapbits(const value: longword): longword; overload;
//value and result at different adresses!
procedure swapbits1(var value: word); overload;
procedure swapbits1(var value: longword); overload;
procedure swaprgb1(var value: longword);
function swaprgb(const value: longword): longword;
......@@ -630,6 +638,8 @@ begin
byte((pchar(@result)+2)^):= byte(value);
end;
//todo: optimize
procedure swapbytes1(var value: word); overload;
var
wo1: word;
......@@ -671,6 +681,42 @@ begin
po1^:= po2^;
end;
function swapbits(const value: word): word; overload;
//value and result at different adresses!
begin
pbyte(pchar(@result))^:= bitreverse[pbyte(pchar(@value)+1)^];
pbyte(pchar(@result)+1)^:= bitreverse[pbyte(pchar(@value))^];
end;
function swapbits(const value: longword): longword; overload;
//value and result at different adresses!
var
po1,po2: pbyte;
begin
po1:= @result;
po2:= pbyte(pchar(@value)+3);
po1^:= bitreverse[po2^]; inc(po1); dec(po2);
po1^:= bitreverse[po2^]; inc(po1); dec(po2);
po1^:= bitreverse[po2^]; inc(po1); dec(po2);
po1^:= bitreverse[po2^];
end;
procedure swapbits1(var value: word); overload;
var
wo1: word;
begin
wo1:= value;
value:= swapbits(wo1);
end;
procedure swapbits1(var value: longword); overload;
var
lwo1: longword;
begin
lwo1:= value;
value:= swapbits(lwo1);
end;
function iszero(address: pointer; count: integer): boolean;
var
int1: integer;
......
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