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CITY.pas
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CITY.pas
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{-------------------------------------------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
-------------------------------------------------------------------------------}
{===============================================================================
CITY hash calculation - main unit
This library is only a naive reimplementation of reference code that can be
found in this repository:
https://github.com/google/cityhash
Because individual historical versions can produce different hashes for the
same message, all versions were implemented, each in its own unit (for
example version 1.0.3 of the hash is implemented in unit CITY_1_0_3.pas).
This allows you to choose which version to use, if you happen to need a
specific older implementation.
Currently implemented versions are:
1.0.0 ... in CITY_1_0_0.pas
1.0.1 ... in CITY_1_0_1.pas, CITY_1_0_1_Test.pas
1.0.2 ... in CITY_1_0_2.pas, CITY_1_0_2_Test.pas
1.0.3 ... in CITY_1_0_3.pas, CITY_1_0_3_Test.pas
1.1.0 ... in CITY_1_1_0.pas, CITY_1_1_0_Test.pas
1.1.1 ... in CITY_1_1_1.pas, CITY_1_1_1_Test.pas
Functions provided in this unit are only redirecting to latest version,
which is currently 1.1.1.
WARNING - version of this library does not correlate with version of
implemented and used version of the CITY hash!
Version 2.1.1 (2023-04-15)
Last change 2024-04-28
©2016-2023 František Milt
Contacts:
František Milt: frantisek.milt@gmail.com
Support:
If you find this code useful, please consider supporting its author(s) by
making a small donation using the following link(s):
https://www.paypal.me/FMilt
Changelog:
For detailed changelog and history please refer to this git repository:
github.com/TheLazyTomcat/Lib.CityHash
Dependencies:
AuxTypes - github.com/TheLazyTomcat/Lib.AuxTypes
BasicUIM - github.com/TheLazyTomcat/Lib.BasicUIM
BitOps - github.com/TheLazyTomcat/Lib.BitOps
HashBase - github.com/TheLazyTomcat/Lib.HashBase
* SimpleCPUID - github.com/TheLazyTomcat/Lib.SimpleCPUID
UInt64Utils - github.com/TheLazyTomcat/Lib.UInt64Utils
SimpleCPUID is required only when PurePascal symbol is not defined.
Library SimpleCPUID might also be required as an indirect dependency.
Indirect dependencies:
AuxClasses - github.com/TheLazyTomcat/Lib.AuxClasses
AuxExceptions - github.com/TheLazyTomcat/Lib.AuxExceptions
StaticMemoryStream - github.com/TheLazyTomcat/Lib.StaticMemoryStream
StrRect - github.com/TheLazyTomcat/Lib.StrRect
WinFileInfo - github.com/TheLazyTomcat/Lib.WinFileInfo
===============================================================================}
unit CITY;
{$INCLUDE 'CITY_defs.inc'}
interface
uses
Classes,
AuxTypes, HashBase,
CITY_Common,
CITY_1_0_0,
CITY_1_0_1,
CITY_1_0_2,
CITY_1_0_3,
CITY_1_1_0,
CITY_1_1_1;
{===============================================================================
Library-specific exceptions
===============================================================================}
type
ECITYIncompatibleClass = class(ECITYException);
ECITYUnsupportedVersion = class(ECITYException);
ECITYUnsupportedVariant = class(ECITYException);
ECITYInvalidImplementation = class(ECITYException);
{===============================================================================
Common types and constants
===============================================================================}
{
Bytes in TCITY* types are always ordered from least significant byte to most
significant byte (little endian).
Types TCITY*Sys have no such guarantee and their endianness is
system-dependent.
To convert the checksum in default ordering to a required specific ordering,
use methods CITY*ToLE for little endian and CITY*ToBE for big endian.
Note that these methods are expecting the input value to be in default
ordering, if it is not, the result will be wrong. Be carefull when using them.
}
type
TCITY32 = array[0..3] of UInt8;
PCITY32 = ^TCITY32;
TCITY64 = array[0..7] of UInt8;
PCITY64 = ^TCITY64;
TCITY128 = array[0..15] of UInt8;
PCITY128 = ^TCITY128;
TCITY256 = array[0..31] of UInt8;
PCITY256 = ^TCITY256;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
type
TCITY32Sys = UInt32;
PCITY32Sys = ^TCITY32Sys;
TCITY64Sys = UInt64;
PCITY64Sys = ^TCITY64Sys;
TCITY128Sys = UInt128;
PCITY128Sys = ^TCITY128Sys;
TCITY256Sys = UInt256;
PCITY256Sys = ^TCITY256Sys;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
type
{
TCITYVersion can be used to select which version of the city hash to use for
calculation - it is here because different historical versions can and will
produce different results.
verDefault corresponds to verCITY111 - this will, unlike in case of verLatest,
never change in the future.
varLatest will always point to the latest implemented version, and therefore
might change in the future.
WARNING - not all widths (32bit, 64bit, 128bit, ...) of the city hash
were implemented from the first version!
}
TCITYVersion = (verDefault,verLatest,verCITY100,verCITY101,verCITY102,
verCITY103,verCITY110,verCITY111);
TCITYVersions = set of TCITYVersion;
{
TCITYVariant can be used to select which variant (with no seed, one seed or
two seeds) of the hash to use for calculation.
WARNING - not all varians are supported by different widths and versions
of the city hash.
}
TCITYVariant = (varPlain,varSeed,varSeeds);
TCITYVariants = set of TCITYVariant;
{===============================================================================
--------------------------------------------------------------------------------
TCityHash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCityHash - class declaration
===============================================================================}
type
TCityHash = class(TBufferHash)
protected
fCityVersion: TCITYVersion;
fCityVariant: TCITYVariant;
procedure SetCityVersion(Value: TCITYVersion); virtual;
procedure SetCityVariant(Value: TCITYVariant); virtual;
procedure Initialize; override;
procedure CheckVersionAndVariant; virtual;
public
class Function HashEndianness: THashEndianness; override;
class Function HashFinalization: Boolean; override;
class Function CityVersionsSupported: TCITYVersions; virtual; abstract;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; virtual; abstract;
constructor CreateAndInitFrom(Hash: THashBase); override;
property CityVersion: TCITYVersion read fCityVersion write SetCityVersion;
property CityVariant: TCityVariant read fCityVariant write SetCityVariant;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity32Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity32Hash - class declaration
===============================================================================}
type
TCity32Hash = class(TCityHash)
protected
fCity32: TCity32Sys;
Function GetCity32: TCity32; virtual;
procedure CalculateHash(Memory: Pointer; Count: TMemSize); override;
procedure Initialize; override;
public
class Function CityVersionsSupported: TCITYVersions; override;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; override;
class Function City32ToSys(City32: TCity32): TCity32Sys; virtual;
class Function City32FromSys(City32: TCity32Sys): TCity32; virtual;
class Function City32ToLE(City32: TCity32): TCity32; virtual;
class Function City32ToBE(City32: TCity32): TCity32; virtual;
class Function City32FromLE(City32: TCity32): TCity32; virtual;
class Function City32FromBE(City32: TCity32): TCity32; virtual;
class Function HashSize: TMemSize; override;
class Function HashName: String; override;
constructor CreateAndInitFrom(Hash: THashBase); overload; override;
constructor CreateAndInitFrom(Hash: TCity32); overload; virtual;
procedure Init; override;
Function Compare(Hash: THashBase): Integer; override;
Function AsString: String; override;
procedure FromString(const Str: String); override;
procedure FromStringDef(const Str: String; const Default: TCity32); reintroduce;
procedure SaveToStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
procedure LoadFromStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
property City32: TCity32 read GetCity32;
property City32Sys: TCity32Sys read fCity32;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity64Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity64Hash - class declaration
===============================================================================}
type
TCity64Hash = class(TCityHash)
protected
fCity64: TCity64Sys;
fSeed0: UInt64;
fSeed1: UInt64;
Function GetCity64: TCity64; virtual;
procedure CalculateHash(Memory: Pointer; Count: TMemSize); override;
procedure Initialize; override;
public
class Function CityVersionsSupported: TCITYVersions; override;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; override;
class Function City64ToSys(City64: TCity64): TCity64Sys; virtual;
class Function City64FromSys(City64: TCity64Sys): TCity64; virtual;
class Function City64ToLE(City64: TCity64): TCity64; virtual;
class Function City64ToBE(City64: TCity64): TCity64; virtual;
class Function City64FromLE(City64: TCity64): TCity64; virtual;
class Function City64FromBE(City64: TCity64): TCity64; virtual;
class Function HashSize: TMemSize; override;
class Function HashName: String; override;
constructor CreateAndInitFrom(Hash: THashBase); overload; override;
constructor CreateAndInitFrom(Hash: TCity64); overload; virtual;
procedure Init; override;
Function Compare(Hash: THashBase): Integer; override;
Function AsString: String; override;
procedure FromString(const Str: String); override;
procedure FromStringDef(const Str: String; const Default: TCity64); reintroduce;
procedure SaveToStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
procedure LoadFromStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
property City64: TCity64 read GetCity64;
property City64Sys: TCity64Sys read fCity64;
property Seed: UInt64 read fSeed0 write fSeed0;
property Seed0: UInt64 read fSeed0 write fSeed0;
property Seed1: UInt64 read fSeed1 write fSeed1;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity128HashBase
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity128HashBase - class declaration
===============================================================================}
type
TCity128HashBase = class(TCityHash)
protected
fCity128: TCity128Sys;
fSeed: UInt128;
Function GetCity128: TCity128; virtual;
procedure Initialize; override;
public
class Function City128ToSys(City128: TCity128): TCity128Sys; virtual;
class Function City128FromSys(City128: TCity128Sys): TCity128; virtual;
class Function City128ToLE(City128: TCity128): TCity128; virtual;
class Function City128ToBE(City128: TCity128): TCity128; virtual;
class Function City128FromLE(City128: TCity128): TCity128; virtual;
class Function City128FromBE(City128: TCity128): TCity128; virtual;
class Function HashSize: TMemSize; override;
constructor CreateAndInitFrom(Hash: THashBase); overload; override;
constructor CreateAndInitFrom(Hash: TCity128); overload; virtual;
procedure Init; override;
Function Compare(Hash: THashBase): Integer; override;
Function AsString: String; override;
procedure FromString(const Str: String); override;
procedure FromStringDef(const Str: String; const Default: TCity128); reintroduce;
procedure SaveToStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
procedure LoadFromStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
property City128: TCity128 read GetCity128;
property City128Sys: TCity128Sys read fCity128;
property Seed: UInt128 read fSeed write fSeed;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity128Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity128Hash - class declaration
===============================================================================}
type
TCity128Hash = class(TCity128HashBase)
protected
procedure CalculateHash(Memory: Pointer; Count: TMemSize); override;
public
class Function CityVersionsSupported: TCITYVersions; override;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; override;
class Function HashName: String; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCityCRC128Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCityCRC128Hash - class declaration
===============================================================================}
type
TCityCRC128Hash = class(TCity128HashBase)
protected
Function GetHashImplementation: THashImplementation; override;
procedure SetHashImplementation(Value: THashImplementation); override;
procedure CalculateHash(Memory: Pointer; Count: TMemSize); override;
public
class Function CityVersionsSupported: TCITYVersions; override;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; override;
class Function HashImplementationsAvailable: THashImplementations; override;
class Function HashImplementationsSupported: THashImplementations; override;
class Function HashName: String; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity256HashBase
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity256HashBase - class declaration
===============================================================================}
type
TCity256HashBase = class(TCityHash)
protected
fCity256: TCity256Sys;
Function GetCity256: TCity256; virtual;
procedure Initialize; override;
public
class Function City256ToSys(City256: TCity256): TCity256Sys; virtual;
class Function City256FromSys(City256: TCity256Sys): TCity256; virtual;
class Function City256ToLE(City256: TCity256): TCity256; virtual;
class Function City256ToBE(City256: TCity256): TCity256; virtual;
class Function City256FromLE(City256: TCity256): TCity256; virtual;
class Function City256FromBE(City256: TCity256): TCity256; virtual;
class Function HashSize: TMemSize; override;
constructor CreateAndInitFrom(Hash: THashBase); overload; override;
constructor CreateAndInitFrom(Hash: TCity256); overload; virtual;
procedure Init; override;
Function Compare(Hash: THashBase): Integer; override;
Function AsString: String; override;
procedure FromString(const Str: String); override;
procedure FromStringDef(const Str: String; const Default: TCity256); reintroduce;
procedure SaveToStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
procedure LoadFromStream(Stream: TStream; Endianness: THashEndianness = heDefault); override;
property City256: TCity256 read GetCity256;
property City256Sys: TCity256Sys read fCity256;
end;
{===============================================================================
--------------------------------------------------------------------------------
TCityCRC256Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCityCRC256Hash - class declaration
===============================================================================}
type
TCityCRC256Hash = class(TCity256HashBase)
protected
Function GetHashImplementation: THashImplementation; override;
procedure SetHashImplementation(Value: THashImplementation); override;
procedure CalculateHash(Memory: Pointer; Count: TMemSize); override;
public
class Function CityVersionsSupported: TCITYVersions; override;
class Function CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants; override;
class Function HashImplementationsAvailable: THashImplementations; override;
class Function HashImplementationsSupported: THashImplementations; override;
class Function HashName: String; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
Backward compatibility functions
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
Utility functions - declaration
===============================================================================}
const
CITY_VersionMajor = 1;
CITY_VersionMinor = 1;
CITY_VersionRelease = 1;
CITY_VersionFull = UInt64($0001000100010000);
CITY_VersionStr = '1.1.1';
Function Hash128to64(x: UInt128): UInt64;{$IFDEF CanInline} inline;{$ENDIF}
{===============================================================================
Main hash functions - declaration
===============================================================================}
Function CityHash32(s: Pointer; len: TMemSize): UInt32;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHash64(s: Pointer; len: TMemSize): UInt64;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHash64WithSeed(s: Pointer; len: TMemSize; seed: UInt64): UInt64;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHash64WithSeeds(s: Pointer; len: TMemSize; seed0,seed1: UInt64): UInt64;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHash128(s: Pointer; len: TMemSize): UInt128;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHash128WithSeed(s: Pointer; len: TMemSize; seed: UInt128): UInt128;{$IFDEF CanInline} inline;{$ENDIF}
{===============================================================================
CRC hash functions - declaration
===============================================================================}
procedure CityHashCrc256(s: Pointer; len: TMemSize; out result: UInt256);{$IFDEF CanInline} inline;{$ENDIF}
Function CityHashCrc128WithSeed(s: Pointer; len: TMemSize; seed: UInt128): UInt128;{$IFDEF CanInline} inline;{$ENDIF}
Function CityHashCrc128(s: Pointer; len: TMemSize): UInt128;{$IFDEF CanInline} inline;{$ENDIF}
implementation
uses
SysUtils, Math,
UInt64Utils;
{$IFDEF FPC_DisableWarns}
{$DEFINE FPCDWM}
{$DEFINE W5057:={$WARN 5057 OFF}} // Local variable "$1" does not seem to be initialized
{$ENDIF}
{===============================================================================
--------------------------------------------------------------------------------
TCityHash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCityHash - class implementation
===============================================================================}
{-------------------------------------------------------------------------------
TCityHash - protected methods
-------------------------------------------------------------------------------}
procedure TCityHash.SetCityVersion(Value: TCITYVersion);
begin
If Value in CityVersionsSupported then
fCityVersion := Value
else
raise ECITYUnsupportedVersion.CreateFmt('TCityHash.SetCityVersion: Unsupported version (%d).',[Ord(Value)]);
end;
//------------------------------------------------------------------------------
procedure TCityHash.SetCityVariant(Value: TCITYVariant);
begin
If Value in CityVariantsSupported(fCityVersion) then
fCityVariant := Value
else
raise ECITYUnsupportedVariant.CreateFmt('TCityHash.SetCityVariant: Unsupported variant (%d).',[Ord(Value)]);
end;
//------------------------------------------------------------------------------
procedure TCityHash.Initialize;
begin
inherited;
fCityVersion := verDefault;
fCityVariant := varPlain;
end;
//------------------------------------------------------------------------------
procedure TCityHash.CheckVersionAndVariant;
begin
If not(fCityVersion in CityVersionsSupported) then
raise ECITYUnsupportedVersion.CreateFmt('%s.CheckVersionAndVariant: Unsupported version (%d).',
[Self.ClassName,Ord(fCityVersion)]);
If not(fCityVariant in CityVariantsSupported(fCityVersion)) then
raise ECITYUnsupportedVariant.CreateFmt('%s.CheckVersionAndVariant: Unsupported variant (%d) for version %d.',
[Self.ClassName,Ord(fCityVariant),Ord(fCityVersion)]);
end;
{-------------------------------------------------------------------------------
TCityHash - public methods
-------------------------------------------------------------------------------}
class Function TCityHash.HashEndianness: THashEndianness;
begin
Result := heLittle;
end;
//------------------------------------------------------------------------------
class Function TCityHash.HashFinalization: Boolean;
begin
Result := True;
end;
//------------------------------------------------------------------------------
constructor TCityHash.CreateAndInitFrom(Hash: THashBase);
begin
inherited CreateAndInitFrom(Hash);
If Hash is TCityHash then
begin
CityVersion := TCityHash(Hash).CityVersion;
CityVariant := TCityHash(Hash).CityVariant;
end
else raise ECITYIncompatibleClass.CreateFmt('TCityHash.CreateAndInitFrom: Incompatible class (%s).',[Hash.ClassName]);
end;
{===============================================================================
--------------------------------------------------------------------------------
TCity32Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity32Hash - class implementation
===============================================================================}
{-------------------------------------------------------------------------------
TCity32Hash - utility functions
-------------------------------------------------------------------------------}
Function SwapEndian(Value: TCITY32Sys): TCITY32Sys; overload;
begin
Result := TCITY32Sys(EndianSwap(UInt32(Value)));
end;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Function SwapEndian(Value: TCITY32): TCITY32; overload;{$IFDEF CanInline} inline; {$ENDIF}
begin
Result := TCITY32(SwapEndian(TCITY32Sys(Value)));
end;
{-------------------------------------------------------------------------------
TCity32Hash - protected methods
-------------------------------------------------------------------------------}
Function TCity32Hash.GetCity32: TCity32;
begin
Result := City32FromSys(fCity32);
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.CalculateHash(Memory: Pointer; Count: TMemSize);
begin
CheckVersionAndVariant;
case fCityVersion of
verCITY110: fCity32 := CITY_1_1_0.CityHash32(Memory,Count);
verDefault,
verLatest,
verCITY111: fCity32 := CITY_1_1_1.CityHash32(Memory,Count);
end;
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.Initialize;
begin
inherited;
fCity32 := 0;
end;
{-------------------------------------------------------------------------------
TCity32Hash - public methods
-------------------------------------------------------------------------------}
class Function TCity32Hash.CityVersionsSupported: TCITYVersions;
begin
Result := [verCITY110,verDefault,verLatest,verCITY111];
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants;
begin
case CityVersion of
verDefault,
verLatest,
verCITY110,
verCITY111: Result := [varPlain];
else
Result := [];
end;
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32ToSys(City32: TCity32): TCity32Sys;
begin
Result := {$IFDEF ENDIAN_BIG}SwapEndian{$ENDIF}(TCity32Sys(City32));
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32FromSys(City32: TCity32Sys): TCity32;
begin
Result := TCity32({$IFDEF ENDIAN_BIG}SwapEndian{$ENDIF}(City32));
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32ToLE(City32: TCity32): TCity32;
begin
Result := City32;
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32ToBE(City32: TCity32): TCity32;
begin
Result := SwapEndian(City32);
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32FromLE(City32: TCity32): TCity32;
begin
Result := City32;
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.City32FromBE(City32: TCity32): TCity32;
begin
Result := SwapEndian(City32);
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.HashSize: TMemSize;
begin
Result := SizeOf(TCITY32);
end;
//------------------------------------------------------------------------------
class Function TCity32Hash.HashName: String;
begin
Result := 'CITY-32';
end;
//------------------------------------------------------------------------------
constructor TCity32Hash.CreateAndInitFrom(Hash: THashBase);
begin
inherited CreateAndInitFrom(Hash);
If Hash is TCity32Hash then
fCity32 := TCity32Hash(Hash).City32Sys
else
raise ECITYIncompatibleClass.CreateFmt('TCity32Hash.CreateAndInitFrom: Incompatible class (%s).',[Hash.ClassName]);
end;
//------------------------------------------------------------------------------
constructor TCity32Hash.CreateAndInitFrom(Hash: TCity32);
begin
CreateAndInit;
fCity32 := City32ToSys(Hash);
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.Init;
begin
inherited;
fCity32 := 0;
end;
//------------------------------------------------------------------------------
Function TCity32Hash.Compare(Hash: THashBase): Integer;
begin
If Hash is TCity32Hash then
begin
If fCity32 > TCity32Hash(Hash).City32Sys then
Result := +1
else If fCity32 < TCity32Hash(Hash).City32Sys then
Result := -1
else
Result := 0;
end
else raise ECITYIncompatibleClass.CreateFmt('TCity32Hash.Compare: Incompatible class (%s).',[Hash.ClassName]);
end;
//------------------------------------------------------------------------------
Function TCity32Hash.AsString: String;
begin
Result := IntToHex(fCity32,8);
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.FromString(const Str: String);
begin
If Length(Str) > 0 then
begin
If Str[1] = '$' then
fCity32 := TCity32Sys(StrToInt(Str))
else
fCity32 := TCity32Sys(StrToInt('$' + Str));
end
else fCity32 := 0;
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.FromStringDef(const Str: String; const Default: TCity32);
begin
inherited FromStringDef(Str,Default);
If not TryFromString(Str) then
fCity32 := City32ToSys(Default);
end;
//------------------------------------------------------------------------------
procedure TCity32Hash.SaveToStream(Stream: TStream; Endianness: THashEndianness = heDefault);
var
Temp: TCity32;
begin
case Endianness of
heSystem: Temp := {$IFDEF ENDIAN_BIG}City32ToBE{$ELSE}City32ToLE{$ENDIF}(City32FromSys(fCity32));
heLittle: Temp := City32ToLE(City32FromSys(fCity32));
heBig: Temp := City32ToBE(City32FromSys(fCity32));
else
{heDefault}
Temp := City32FromSys(fCity32);
end;
Stream.WriteBuffer(Temp,SizeOf(TCity32));
end;
//------------------------------------------------------------------------------
{$IFDEF FPCDWM}{$PUSH}W5057{$ENDIF}
procedure TCity32Hash.LoadFromStream(Stream: TStream; Endianness: THashEndianness = heDefault);
var
Temp: TCity32;
begin
Stream.ReadBuffer(Temp,SizeOf(TCity32));
case Endianness of
heSystem: fCity32 := City32ToSys({$IFDEF ENDIAN_BIG}City32FromBE{$ELSE}City32FromLE{$ENDIF}(Temp));
heLittle: fCity32 := City32ToSys(City32FromLE(Temp));
heBig: fCity32 := City32ToSys(City32FromBE(Temp));
else
{heDefault}
fCity32 := City32ToSys(Temp);
end;
end;
{$IFDEF FPCDWM}{$POP}{$ENDIF}
{===============================================================================
--------------------------------------------------------------------------------
TCity64Hash
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TCity64Hash - class implementation
===============================================================================}
{-------------------------------------------------------------------------------
TCity64Hash - utility functions
-------------------------------------------------------------------------------}
Function SwapEndian(Value: TCITY64Sys): TCITY64Sys; overload;
begin
Result := TCITY64Sys(EndianSwap(UInt64(Value)));
end;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Function SwapEndian(Value: TCITY64): TCITY64; overload;{$IFDEF CanInline} inline; {$ENDIF}
begin
Result := TCITY64(SwapEndian(TCITY64Sys(Value)));
end;
{-------------------------------------------------------------------------------
TCity64Hash - protected methods
-------------------------------------------------------------------------------}
Function TCity64Hash.GetCity64: TCity64;
begin
Result := City64FromSys(fCity64);
end;
//------------------------------------------------------------------------------
procedure TCity64Hash.CalculateHash(Memory: Pointer; Count: TMemSize);
begin
CheckVersionAndVariant;
case fCityVersion of
verCITY100: case fCityVariant of
varPlain: fCity64 := CITY_1_0_0.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_0_0.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_0_0.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
verCITY101: case fCityVariant of
varPlain: fCity64 := CITY_1_0_1.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_0_1.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_0_1.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
verCITY102: case fCityVariant of
varPlain: fCity64 := CITY_1_0_2.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_0_2.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_0_2.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
verCITY103: case fCityVariant of
varPlain: fCity64 := CITY_1_0_3.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_0_3.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_0_3.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
verCITY110: case fCityVariant of
varPlain: fCity64 := CITY_1_1_0.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_1_0.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_1_0.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
verDefault,
verLatest,
verCITY111: case fCityVariant of
varPlain: fCity64 := CITY_1_1_1.CityHash64(Memory,Count);
varSeed: fCity64 := CITY_1_1_1.CityHash64WithSeed(Memory,Count,fSeed0);
varSeeds: fCity64 := CITY_1_1_1.CityHash64WithSeeds(Memory,Count,fSeed0,fSeed1);
end;
end;
end;
//------------------------------------------------------------------------------
procedure TCity64Hash.Initialize;
begin
inherited;
fCity64 := 0;
end;
{-------------------------------------------------------------------------------
TCity64Hash - public methods
-------------------------------------------------------------------------------}
class Function TCity64Hash.CityVersionsSupported: TCITYVersions;
begin
Result := [verDefault,verLatest,verCITY100,verCITY101,verCITY102,verCITY103,verCITY110,verCITY111];
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.CityVariantsSupported(CityVersion: TCITYVersion): TCITYVariants;
begin
case CityVersion of
verDefault,
verLatest,
verCITY100,
verCITY101,
verCITY102,
verCITY103,
verCITY110,
verCITY111: Result := [varPlain,varSeed,varSeeds];
else
Result := [];
end;
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64ToSys(City64: TCity64): TCity64Sys;
begin
Result := {$IFDEF ENDIAN_BIG}SwapEndian{$ENDIF}(TCity64Sys(City64));
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64FromSys(City64: TCity64Sys): TCity64;
begin
Result := TCity64({$IFDEF ENDIAN_BIG}SwapEndian{$ENDIF}(City64));
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64ToLE(City64: TCity64): TCity64;
begin
Result := City64;
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64ToBE(City64: TCity64): TCity64;
begin
Result := SwapEndian(City64);
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64FromLE(City64: TCity64): TCity64;
begin
Result := City64;
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.City64FromBE(City64: TCity64): TCity64;
begin
Result := SwapEndian(City64);
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.HashSize: TMemSize;
begin
Result := SizeOf(TCITY64);
end;
//------------------------------------------------------------------------------
class Function TCity64Hash.HashName: String;
begin
Result := 'CITY-64';
end;
//------------------------------------------------------------------------------
constructor TCity64Hash.CreateAndInitFrom(Hash: THashBase);
begin
inherited CreateAndInitFrom(Hash);
If Hash is TCity64Hash then
fCity64 := TCity64Hash(Hash).City64Sys
else
raise ECITYIncompatibleClass.CreateFmt('TCity64Hash.CreateAndInitFrom: Incompatible class (%s).',[Hash.ClassName]);
end;
//------------------------------------------------------------------------------
constructor TCity64Hash.CreateAndInitFrom(Hash: TCity64);
begin
CreateAndInit;
fCity64 := City64ToSys(Hash);
end;
//------------------------------------------------------------------------------
procedure TCity64Hash.Init;
begin
inherited;
fCity64 := 0;
end;
//------------------------------------------------------------------------------
Function TCity64Hash.Compare(Hash: THashBase): Integer;
begin
If Hash is TCity64Hash then
Result := CompareUInt64(fCity64,TCity64Hash(Hash).City64Sys)
else
raise ECITYIncompatibleClass.CreateFmt('TCity64Hash.Compare: Incompatible class (%s).',[Hash.ClassName]);
end;