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mirror of synced 2024-09-19 01:36:08 +00:00

Fixed: bug in Binary Tree where root node would not be assigned an index

Fixed: Hash() implementation
This commit is contained in:
Mark van Renswoude 2004-07-29 15:49:42 +00:00
parent 4d284957d4
commit d3ae64e43d
5 changed files with 176 additions and 142 deletions

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@ -32,6 +32,6 @@
-M
-$M16384,1048576
-K$00400000
-LE"c:\delphi6\Projects\Bpl"
-LN"c:\delphi6\Projects\Bpl"
-LE"c:\program files\borland\delphi6\Projects\Bpl"
-LN"c:\program files\borland\delphi6\Projects\Bpl"
-DmadExcept

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@ -56,10 +56,6 @@ HostApplication=
Launcher=
UseLauncher=0
DebugCWD=
[Language]
ActiveLang=
ProjectLang=
RootDir=
[Version Info]
IncludeVerInfo=0
AutoIncBuild=0
@ -86,11 +82,118 @@ ProductName=
ProductVersion=1.0.0.0
Comments=
[Excluded Packages]
c:\delphi6\Projects\Bpl\DIPasDocD6.bpl=DiPasDoc - Designtime
C:\Program Files\madCollection\madRemote\Delphi 6\madRemote_.bpl=madRemote 1.1b · www.madshi.net
C:\Program Files\madCollection\madKernel\Delphi 6\madKernel_.bpl=madKernel 1.3 · www.madshi.net
C:\Program Files\madCollection\madCodeHook\Delphi 6\madCodeHook_.bpl=madCodeHook 2.1b · www.madshi.net
C:\Program Files\madCollection\madSecurity\Delphi 6\madSecurity_.bpl=madSecurity 1.1n · www.madshi.net
C:\Program Files\madCollection\madShell\Delphi 6\madShell_.bpl=madShell 1.3k · www.madshi.net
c:\program files\borland\delphi6\Projects\Bpl\VirtualTreesD6D.bpl=Virtual Treeview
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\JvCoreD6D.bpl=JVCL Core Components
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\JvStdCtrlsD6D.bpl=JVCL Standard Controls
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\tbx_d6.bpl=Toolbar2000 -- TBX Extensions (Alex Denisov)
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\tb2k_d6.bpl=Toolbar2000 Components (Jordan Russell)
c:\program files\borland\delphi6\Projects\Bpl\tbxdsgn_d6.bpl=Toolbar2000 -- TBX Extensions Design Package (Alex Denisov)
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\tb2kdsgn_d6.bpl=Toolbar2000 Design Package (Jordan Russell)
c:\program files\borland\delphi6\Bin\applet60.bpl=Borland Control Panel Applet Package
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvJansD6D.bpl=JVCL Jans Components
c:\program files\borland\delphi6\Projects\Bpl\dclIndyCore60.bpl=Indy 10 Core Design Time
c:\program files\borland\delphi6\Projects\Bpl\dclIndyProtocols60.bpl=Indy 10 Protocols Design Time
c:\program files\borland\delphi6\Projects\Bpl\P164_D60.bpl=TurboPower OfficePartner 1.64 Design-time package - VCL60
c:\program files\borland\delphi6\Projects\Bpl\v103_d60.bpl=TurboPower VisualPlanIt 1.03 designtime package - VCL60
c:\program files\borland\delphi6\Projects\Bpl\BalloonD6.bpl=Balloon 2.0
c:\program files\borland\delphi6\Projects\Bpl\SysILS.bpl=(untitled)
c:\program files\borland\delphi6\Projects\Bpl\DragDropD6.bpl=Drag and Drop Component Suite
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvCustomD6D.bpl=JVCL Custom Controls
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvCtrlsD6D.bpl=JVCL Visual Controls
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvWizardD6D.bpl=JVCL Wizard Design Time Package
c:\program files\borland\delphi6\Projects\Bpl\dclIndy60.bpl=Internet Direct (Indy) for D6 Property and Component Editors
c:\program files\borland\delphi6\Bin\dclnet60.bpl=Borland Internet Components
c:\program files\borland\delphi6\Bin\dclsoap60.bpl=Borland SOAP Components
c:\program files\borland\delphi6\Projects\Bpl\ColorPickerButtonD6.bpl=ColorPickerButton
C:\Program Files\Borland\Delphi6\Projects\Bpl\ThreadNameExpert60.bpl=JCL Thread Name IDE expert for Delphi 6
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvDlgsD6D.bpl=JVCL Dialog Components
c:\program files\borland\delphi6\Projects\Bpl\asqlite.bpl=Aducom Software -- SQLite Design Time Components
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\aSQLitepkg.bpl=Aducom Software -- SQLite RunTime Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvAppFrmD6D.bpl=JVCL Application and Form Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvBandsD6D.bpl=JVCL Band Objects
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvCmpD6D.bpl=JVCL Non-Visual Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvCryptD6D.bpl=JVCL Encryption and Compression Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvDockingD6D.bpl=JVCL Docking Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvDotNetCtrlsD6D.bpl=JVCL DotNet Controls
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvGlobusD6D.bpl=JVCL Globus Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvHMID6D.bpl=JVCL HMI Controls design time unit
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvInterpreterD6D.bpl=JVCL Interpreter Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvManagedThreadsD6D.bpl=JVCL Managed Threads
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvMMD6D.bpl=JVCL Multimedia and Image Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvNetD6D.bpl=JVCL Network Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvPageCompsD6D.bpl=JVCL Page Style Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvPluginD6D.bpl=JVCL Plugin Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvPrintPreviewD6D.bpl=JVCL Print Preview Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvSystemD6D.bpl=JVCL System Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvTimeFrameworkD6D.bpl=JVCL Time Framework
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvValidatorsD6D.bpl=JVCL Validators and Error Provider Components
C:\Program Files\Borland\Delphi6\Projects\Bpl\JvXPCtrlsD6D.bpl=JVCL XP Controls
c:\program files\borland\delphi6\Projects\Bpl\GJLSoftwareD5.bpl=GJL Software ExDBGrid Components
c:\program files\borland\delphi6\Projects\Bpl\FREEREP6.bpl=FreeReport 2.32 Components
c:\program files\borland\delphi6\Projects\Bpl\PageControlExD6.bpl=PageControlEx
F:\Delphi\Components\madCollection\madExcept\Delphi 6\madExceptIde_.bpl=madExceptIde 1.0b · www.madshi.net
c:\program files\borland\delphi6\Projects\Bpl\ZCore.bpl=Zeos Core Classes and Intefaces
c:\program files\borland\delphi6\Projects\Bpl\ZParse.bpl=Zeos Parsing Classes and Intefaces
c:\program files\borland\delphi6\Projects\Bpl\ZParseSql.bpl=Zeos SQL Parsing Classes and Intefaces
c:\program files\borland\delphi6\Projects\Bpl\ZPlain.bpl=Zeos Plain Database API
c:\program files\borland\delphi6\Projects\Bpl\ZDbc.bpl=Zeos Low Level Database API
c:\program files\borland\delphi6\Projects\Bpl\ZComponent.bpl=Zeos Database Components
c:\program files\borland\delphi6\Projects\Bpl\IconXPD6.bpl=IconXP
c:\program files\borland\delphi6\Projects\Bpl\NLDVDBT_D6D.bpl=NLDVirtualDBTree
c:\program files\borland\delphi6\Projects\Bpl\ff2_d60.bpl=TurboPower FlashFiler Designtime Package - VCL60
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\GR32_D6.bpl=Graphics32
c:\program files\borland\delphi6\Projects\Bpl\GR32_DSGN_D6.bpl=Graphics32 Design Time Package
c:\program files\borland\delphi6\Projects\Bpl\PNGImage_D6.bpl=PNGImage
c:\program files\borland\delphi6\Projects\Bpl\SynEdit_D6.bpl=SynEdit component suite
c:\program files\borland\delphi6\Projects\Bpl\DelphiX_for5.bpl=DelphiX - DirectX components for Delphi
c:\program files\borland\delphi6\Projects\Bpl\NLDMBD6D.bpl=NLDMessageBox
c:\program files\borland\delphi6\Bin\dcl31w60.bpl=Delphi 1.0 Compatibility Components
c:\program files\borland\delphi6\Projects\Bpl\NLDTrayIconD6.bpl=NLDTrayIcon donated by SVG_1986
c:\program files\borland\delphi6\Projects\Bpl\ServerListD6D.bpl=SOF2Manager - Server List Designtime
C:\WINDOWS\System32\ibevnt60.bpl=Borland Interbase Event Alerter Component
c:\delphi6\Projects\Bpl\PsychoTidyD6.bpl=PsychoTidy IDE Expert
F:\Delphi\Components\madCollection\madBasic\Delphi 6\madHelp_.bpl=madHelp 1.1 · www.madshi.net
F:\Delphi\Components\madCollection\madRemote\Delphi 6\madRemote_.bpl=madRemote 1.1a · www.madshi.net
F:\Delphi\Components\madCollection\madKernel\Delphi 6\madKernel_.bpl=madKernel 1.2z · www.madshi.net
F:\Delphi\Components\madCollection\madCodeHook\Delphi 6\madCodeHook_.bpl=madCodeHook 2.0a · www.madshi.net
F:\Delphi\Components\madCollection\madSecurity\Delphi 6\madSecurity_.bpl=madSecurity 1.1n · www.madshi.net
F:\Delphi\Components\madCollection\madShell\Delphi 6\madShell_.bpl=madShell 1.3i · www.madshi.net
c:\program files\borland\delphi6\Projects\Bpl\BMSpinEditD6.bpl=BMSpinEdit
c:\program files\borland\delphi6\Projects\Bpl\GLScene6.bpl=GLScene - OpenGL 3D library
c:\program files\borland\delphi6\Projects\Bpl\TntUnicodeVcl_D60.bpl=Tnt Unicode Controls
c:\program files\borland\delphi6\Bin\dclsmp60.bpl=Borland Sample Components
c:\program files\borland\delphi6\Projects\Bpl\X2MultiMon_D6D.bpl=X2MultiMon Designtime Package
F:\Delphi\Components\ZipForge\Lib\Delphi 6\dclZipForged6.bpl=ZipForge Package
c:\program files\borland\delphi6\Bin\dclado60.bpl=Borland ADO DB Components
c:\program files\borland\delphi6\Bin\dclbde60.bpl=Borland BDE DB Components
C:\Program Files\Borland\Delphi6\Bin\dbx60.bpl=Borland SQL Explorer UI Package
c:\program files\borland\delphi6\Bin\DCLIB60.bpl=InterBase Data Access Components
c:\program files\borland\delphi6\Bin\dclbdecds60.bpl=Borland Local BDE ClientDataset Components
c:\program files\borland\delphi6\Bin\dclqrt60.bpl=QuickReport Components
c:\program files\borland\delphi6\Bin\dcltee60.bpl=TeeChart Components
c:\program files\borland\delphi6\Bin\dcldss60.bpl=Borland Decision Cube Components
c:\program files\borland\delphi6\Bin\dcltqr60.bpl=TeeChart for QuickReport Components
c:\program files\borland\delphi6\Bin\dclclxdb60.bpl=Borland CLX Database Components
C:\Program Files\Borland\Delphi6\Bin\dclclxstd60.bpl=Borland CLX Standard Components
c:\program files\borland\delphi6\Bin\dclmcn60.bpl=Borland DataSnap Connection Components
c:\program files\borland\delphi6\Bin\dclemacsedit60.bpl=Borland Editor Emacs Enhancements
c:\program files\borland\delphi6\Bin\dclshlctrls60.bpl=Shell Control Property and Component Editors
c:\program files\borland\delphi6\Bin\DBWEBXPRT.BPL=Borland Web Wizard Package
c:\program files\borland\delphi6\Bin\dclwbm60.bpl=Borland InternetExpress Components
c:\program files\borland\delphi6\Bin\dclie60.bpl=Internet Explorer Components
c:\program files\borland\delphi6\Bin\dclwebsnap60.bpl=Borland WebSnap Components
c:\program files\borland\delphi6\Bin\dclite60.bpl=Borland Integrated Translation Environment
c:\program files\borland\delphi6\Bin\dcldbx60.bpl=Borland dbExpress Components
c:\program files\borland\delphi6\Bin\dcldbxcds60.bpl=Borland Local DBX ClientDataset Components
[Included Packages]
C:\Program Files\Borland\Delphi6\Bin\dclstd60.bpl=Borland Standard Components
c:\program files\borland\delphi6\Bin\dclsmpedit60.bpl=Borland Editor Script Enhancements
C:\Program Files\Borland\Delphi6\Bin\dcldb60.bpl=Borland Database Components
C:\Program Files\Borland\Delphi6\Bin\dclact60.bpl=Borland ActionBar Components
F:\Delphi\Components\madCollection\madBasic\Delphi 6\madBasic_.bpl=madBasic 1.1f · www.madshi.net
F:\Delphi\Components\madCollection\madDisAsm\Delphi 6\madDisAsm_.bpl=madDisAsm 2.0a · www.madshi.net
F:\Delphi\Components\madCollection\madExcept\Delphi 6\madExcept_.bpl=madExcept 2.6a · www.madshi.net
F:\Delphi\Components\madCollection\madExcept\Delphi 6\madExceptWizard_.bpl=madExceptWizard 2.6 · www.madshi.net
c:\program files\borland\delphi6\Bin\dclcds60.bpl=Borland Base Cached ClientDataset Component
C:\Program Files\Borland\Delphi6\Bin\dclmid60.bpl=Borland MyBase DataAccess Components
C:\PROGRA~1\Borland\Delphi6\Projects\Bpl\ThemeManager6.bpl=Windows XP Theme Manager
H:\Downloads\commentexpert.bpl=Comment Expert v1.0 Alpha

View File

@ -61,7 +61,7 @@ begin
shData := TX2UtStringHash.Create();
try
shData['this'] := 'is';
shData['thisakslhalskdjfhaslkdfjhaslkfjh'] := 'is';
shData['a'] := 'test';
shData.Reset();

View File

@ -311,7 +311,8 @@ begin
if ACanCreate then
begin
InitNode(FRoot);
Result := FRoot;
FRoot^.Index := AIndex;
Result := FRoot;
if ASetCursor then
begin

View File

@ -135,9 +135,6 @@ type
property CurrentValue: String read GetCurrentValue;
end;
procedure Mix(var A, B, C: Cardinal);
implementation
resourcestring
RSEmptyKey = 'Cannot hash an empty key!';
@ -159,141 +156,74 @@ end;
Hashing
========================================}
procedure Mix(var A, B, C: Cardinal);
asm
sub A, B; sub A, C; shr C, 13; xor A, C;
sub B, C; sub B, A; shl A, 8; xor B, A;
sub C, A; sub C, B; shr B, 13; xor C, B;
sub A, B; sub A, C; shr C, 12; xor A, C;
sub B, C; sub B, A; shl A, 16; xor B, A;
sub C, A; sub C, B; shr B, 5; xor C, B;
sub A, B; sub A, C; shr C, 3; xor A, C;
sub B, C; sub B, A; shl A, 10; xor B, A;
sub C, A; sub C, B; shr B, 15; xor C, B;
begin
Dec(A, B); Dec(A, C); C := C shr 13; A := A xor C;
Dec(B, C); Dec(B, A); A := A shl 8; B := B xor A;
Dec(C, A); Dec(C, B); B := B shr 13; C := C xor B;
Dec(A, B); Dec(A, C); C := C shr 12; A := A xor C;
Dec(B, C); Dec(B, A); A := A shl 16; B := B xor A;
Dec(C, A); Dec(C, B); B := B shr 5; C := C xor B;
Dec(A, B); Dec(A, C); C := C shr 3; A := A xor C;
Dec(B, C); Dec(B, A); A := A shl 10; B := B xor A;
Dec(C, A); Dec(C, B); B := B shr 15; C := C xor B;
end;
function TX2UtCustomHash.Hash;
var
iA: Cardinal;
iB: Cardinal;
iC: Cardinal;
iLength: Cardinal;
pValue: PChar;
begin
Result := 0;
(*
ypedef unsigned long int ub4; /* unsigned 4-byte quantities */
typedef unsigned char ub1; /* unsigned 1-byte quantities */
iA := $9e3779b9;
iB := iA;
iC := iA;
iLength := Length(AValue);
pValue := PChar(AValue);
#define hashsize(n) ((ub4)1<<(n))
#define hashmask(n) (hashsize(n)-1)
// Handle most of the key
while (iLength >= 12) do
begin
Inc(iA, Ord(pValue[0]) + (Ord(pValue[1]) shl 8) + (Ord(pValue[2]) shl 16) +
(Ord(pValue[3]) shl 24));
Inc(iB, Ord(pValue[4]) + (Ord(pValue[5]) shl 8) + (Ord(pValue[6]) shl 16) +
(Ord(pValue[7]) shl 24));
Inc(iA, Ord(pValue[8]) + (Ord(pValue[9]) shl 8) + (Ord(pValue[10]) shl 16) +
(Ord(pValue[11]) shl 24));
/*
--------------------------------------------------------------------
mix -- mix 3 32-bit values reversibly.
For every delta with one or two bits set, and the deltas of all three
high bits or all three low bits, whether the original value of a,b,c
is almost all zero or is uniformly distributed,
* If mix() is run forward or backward, at least 32 bits in a,b,c
have at least 1/4 probability of changing.
* If mix() is run forward, every bit of c will change between 1/3 and
2/3 of the time. (Well, 22/100 and 78/100 for some 2-bit deltas.)
mix() was built out of 36 single-cycle latency instructions in a
structure that could supported 2x parallelism, like so:
a -= b;
a -= c; x = (c>>13);
b -= c; a ^= x;
b -= a; x = (a<<8);
c -= a; b ^= x;
c -= b; x = (b>>13);
...
Unfortunately, superscalar Pentiums and Sparcs can't take advantage
of that parallelism. They've also turned some of those single-cycle
latency instructions into multi-cycle latency instructions. Still,
this is the fastest good hash I could find. There were about 2^^68
to choose from. I only looked at a billion or so.
--------------------------------------------------------------------
*/
#define mix(a,b,c) \
{ \
a -= b; a -= c; a ^= (c>>13); \
b -= c; b -= a; b ^= (a<<8); \
c -= a; c -= b; c ^= (b>>13); \
a -= b; a -= c; a ^= (c>>12); \
b -= c; b -= a; b ^= (a<<16); \
c -= a; c -= b; c ^= (b>>5); \
a -= b; a -= c; a ^= (c>>3); \
b -= c; b -= a; b ^= (a<<10); \
c -= a; c -= b; c ^= (b>>15); \
}
Mix(iA, iB, iC);
Inc(pValue, 12);
Dec(iLength, 12);
end;
/*
--------------------------------------------------------------------
hash() -- hash a variable-length key into a 32-bit value
k : the key (the unaligned variable-length array of bytes)
len : the length of the key, counting by bytes
initval : can be any 4-byte value
Returns a 32-bit value. Every bit of the key affects every bit of
the return value. Every 1-bit and 2-bit delta achieves avalanche.
About 6*len+35 instructions.
// Handle the last 11 bytes
Inc(iC, iLength);
The best hash table sizes are powers of 2. There is no need to do
mod a prime (mod is sooo slow!). If you need less than 32 bits,
use a bitmask. For example, if you need only 10 bits, do
h = (h & hashmask(10));
In which case, the hash table should have hashsize(10) elements.
while iLength > 0 do
begin
case iLength of
11: Inc(iC, Ord(pValue[10]) shr 24);
10: Inc(iC, Ord(pValue[9]) shr 16);
9: Inc(iC, Ord(pValue[8]) shr 8);
8: Inc(iB, Ord(pValue[7]) shr 24);
7: Inc(iB, Ord(pValue[6]) shr 16);
6: Inc(iB, Ord(pValue[5]) shr 8);
5: Inc(iB, Ord(pValue[4]));
4: Inc(iA, Ord(pValue[3]) shr 24);
3: Inc(iA, Ord(pValue[2]) shr 16);
2: Inc(iA, Ord(pValue[1]) shr 8);
1: Inc(iA, Ord(pValue[0]));
end;
If you are hashing n strings (ub1 ** )k, do it like this:
for (i=0, h=0; i<n; ++i) h = hash( k[i], len[i], h);
Dec(iLength);
end;
By Bob Jenkins, 1996. bob_jenkins@burtleburtle.net. You may use this
code any way you wish, private, educational, or commercial. It's free.
See http://burtleburtle.net/bob/hash/evahash.html
Use for hash table lookup, or anything where one collision in 2^^32 is
acceptable. Do NOT use for cryptographic purposes.
--------------------------------------------------------------------
*/
ub4 hash( k, length, initval)
register ub1 *k; /* the key */
register ub4 length; /* the length of the key */
register ub4 initval; /* the previous hash, or an arbitrary value */
{
register ub4 a,b,c,len;
/* Set up the internal state */
len = length;
a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
c = initval; /* the previous hash value */
/*---------------------------------------- handle most of the key */
while (len >= 12)
{
a += (k[0] +((ub4)k[1]<<8) +((ub4)k[2]<<16) +((ub4)k[3]<<24));
b += (k[4] +((ub4)k[5]<<8) +((ub4)k[6]<<16) +((ub4)k[7]<<24));
c += (k[8] +((ub4)k[9]<<8) +((ub4)k[10]<<16)+((ub4)k[11]<<24));
mix(a,b,c);
k += 12; len -= 12;
}
/*------------------------------------- handle the last 11 bytes */
c += length;
switch(len) /* all the case statements fall through */
{
case 11: c+=((ub4)k[10]<<24);
case 10: c+=((ub4)k[9]<<16);
case 9 : c+=((ub4)k[8]<<8);
/* the first byte of c is reserved for the length */
case 8 : b+=((ub4)k[7]<<24);
case 7 : b+=((ub4)k[6]<<16);
case 6 : b+=((ub4)k[5]<<8);
case 5 : b+=k[4];
case 4 : a+=((ub4)k[3]<<24);
case 3 : a+=((ub4)k[2]<<16);
case 2 : a+=((ub4)k[1]<<8);
case 1 : a+=k[0];
/* case 0: nothing left to add */
}
mix(a,b,c);
/*-------------------------------------------- report the result */
return c;
}
*)
Mix(iA, iB, iC);
Result := iC;
end;
@ -346,7 +276,7 @@ end;
function TX2UtCustomHash.LookupItem;
var
iIndex: Integer;
iIndex: Cardinal;
pData: PX2UtHashList;
pFound: PX2UtHashItem;
pItem: PX2UtHashItem;