104 lines
2.9 KiB
Plaintext
104 lines
2.9 KiB
Plaintext
(*
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* CentrEd+ (c) 2013 by StaticZ <uoquint.ru>
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* Base on Wyatt algoritm published on www.ruosi.org
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*)
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unit UUopFile;
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{$mode objfpc}{$H+}
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interface
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uses
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SysUtils, Classes, Graphics, UMulBlock;
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function HashFileName(string s) : QWord;
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function UopContainer()
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type
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TUopHeader = packed record;
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Format: DWord;
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Version: DWord;
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Signature: DWord;
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Offset: QWord;
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Capacity: DWord;
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Count: DWord;
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end;
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TUopIndex = packed record;
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Offset: DWord;
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Length: DWord;
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Uncomp: DWord;
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Append: DWord;
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end;
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implementation
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{ THue }
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function HashFileName(string s) : QWord;
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var
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i, stl, eax, ecx, edx, ebx, esi, edi : DWord;
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begin
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i := 0; stl := Length(s);
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eax := 0; ebx := $DEADBEEF + stl;
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ecx := 0; edi := $DEADBEEF + stl;
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edx := 0; esi := $DEADBEEF + stl;
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while i < stl do begin
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edi := (uint)((ord(s[i+ 7])shl 24)or(ord(s[i+ 6])shl 16)or(ord(s[i+ 5])shl 8)or ord(s[i+ 4]))+edi;
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esi := (uint)((ord(s[i+11])shl 24)or(ord(s[i+10])shl 16)or(ord(s[i+ 9])shl 8)or ord(s[i+ 8]))+esi;
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edx := (uint)((ord(s[i+ 3])shl 24)or(ord(s[i+ 2])shl 16)or(ord(s[i+ 1])shl 8)or ord(s[i ]))-esi;
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edx := (edx + ebx)xor(esi shr 28)xor(esi shl 4);
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inc(esi, edi);
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edi := (edi - edx)xor(edx shr 26)xor(edx shl 6);
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inc(edx, esi);
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esi := (esi - edi)xor(edi shr 24)xor(edi shl 8);
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inc(edi, edx);
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ebx := (edx - esi)xor(esi shr 16)xor(esi shl 16);
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inc(esi, edi);
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edi := (edi - ebx)xor(ebx shr 13)xor(ebx shl 19);
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inc(ebx, esi);
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esi := (esi - edi)xor(edi shr 28)xor(edi shl 4);
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inc(edi, ebx);
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inc(i, 12);
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end;
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if (stl - i) > 0 then begin
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if (stl - i) <= 12 then inc(esi, DWord(ord(s[i+11])shl 24));
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if (stl - i) <= 11 then inc(esi, DWord(ord(s[i+10])shl 16));
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if (stl - i) <= 10 then inc(esi, DWord(ord(s[i+ 9])shl 8));
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if (stl - i) <= 9 then inc(esi, DWord(ord(s[i+ 8]) ));
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if (stl - i) <= 8 then inc(edi, DWord(ord(s[i+ 7])shl 24));
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if (stl - i) <= 7 then inc(edi, DWord(ord(s[i+ 6])shl 16));
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if (stl - i) <= 6 then inc(edi, DWord(ord(s[i+ 5])shl 8));
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if (stl - i) <= 5 then inc(edi, DWord(ord(s[i+ 4]) ));
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if (stl - i) <= 4 then inc(ebx, DWord(ord(s[i+ 3])shl 24));
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if (stl - i) <= 3 then inc(ebx, DWord(ord(s[i+ 2])shl 16));
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if (stl - i) <= 2 then inc(ebx, DWord(ord(s[i+ 1])shl 8));
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if (stl - i) <= 1 then inc(ebx, DWord(ord(s[i+ 0]) ));
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esi := (esi xor edi) - ((edi shr 18)xor(edi shl 14));
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ecx := (esi xor ebx) - ((esi shr 21)xor(esi shl 11));
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edi := (edi xor ecx) - ((ecx shr 7)xor(ecx shl 25));
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esi := (esi xor edi) - ((edi shr 16)xor(edi shl 16));
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edx := (esi xor ecx) - ((esi shr 28)xor(esi shl 4));
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edi := (edi xor edx) - ((edx shr 18)xor(edx shl 14));
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eax := (esi xor edi) - ((edi shr 8)xor(edi shl 24));
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Result := (QWord(edi) shl 32) or eax;
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end else begin
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Result := (QWord(esi) shl 32) or eax;
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end;
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end;
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end.
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