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(*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*)
unit Thrift.Utils;
interface
{$I Thrift.Defines.inc}
uses
{$IFDEF OLD_UNIT_NAMES}
Classes, Windows, SysUtils, Character, SyncObjs, TypInfo, Rtti;
{$ELSE}
System.Classes, Winapi.Windows, System.SysUtils, System.Character,
System.SyncObjs, System.TypInfo, System.Rtti;
{$ENDIF}
type
ISupportsToString = interface
['{AF71C350-E0CD-4E94-B77C-0310DC8227FF}']
function ToString : string;
end;
IOverlappedHelper = interface
['{A1832EFA-2E02-4884-8F09-F0A0277157FA}']
function Overlapped : TOverlapped;
function OverlappedPtr : POverlapped;
function WaitHandle : THandle;
function WaitFor(dwTimeout: DWORD) : DWORD;
end;
TOverlappedHelperImpl = class( TInterfacedObject, IOverlappedHelper)
strict protected
FOverlapped : TOverlapped;
FEvent : TEvent;
// IOverlappedHelper
function Overlapped : TOverlapped;
function OverlappedPtr : POverlapped;
function WaitHandle : THandle;
function WaitFor(dwTimeout: DWORD) : DWORD;
public
constructor Create;
destructor Destroy; override;
end;
TThriftStringBuilder = class( TStringBuilder)
public
function Append(const Value: TBytes): TStringBuilder; overload;
function Append(const Value: ISupportsToString): TStringBuilder; overload;
end;
Base64Utils = class sealed
public
class function Encode( const src : TBytes; srcOff, len : Integer; dst : TBytes; dstOff : Integer) : Integer; static;
class function Decode( const src : TBytes; srcOff, len : Integer; dst : TBytes; dstOff : Integer) : Integer; static;
end;
CharUtils = class sealed
public
class function IsHighSurrogate( const c : Char) : Boolean; static; inline;
class function IsLowSurrogate( const c : Char) : Boolean; static; inline;
end;
EnumUtils<T> = class sealed
public
class function ToString(const value : Integer) : string; reintroduce; static; inline;
end;
StringUtils<T> = class sealed
public
class function ToString(const value : T) : string; reintroduce; static; inline;
end;
const
THRIFT_MIMETYPE = 'application/x-thrift';
{$IFDEF Win64}
function InterlockedExchangeAdd64( var Addend : Int64; Value : Int64) : Int64;
{$ENDIF}
implementation
{ TOverlappedHelperImpl }
constructor TOverlappedHelperImpl.Create;
begin
inherited Create;
FillChar( FOverlapped, SizeOf(FOverlapped), 0);
FEvent := TEvent.Create( nil, TRUE, FALSE, ''); // always ManualReset, see MSDN
FOverlapped.hEvent := FEvent.Handle;
end;
destructor TOverlappedHelperImpl.Destroy;
begin
try
FOverlapped.hEvent := 0;
FreeAndNil( FEvent);
finally
inherited Destroy;
end;
end;
function TOverlappedHelperImpl.Overlapped : TOverlapped;
begin
result := FOverlapped;
end;
function TOverlappedHelperImpl.OverlappedPtr : POverlapped;
begin
result := @FOverlapped;
end;
function TOverlappedHelperImpl.WaitHandle : THandle;
begin
result := FOverlapped.hEvent;
end;
function TOverlappedHelperImpl.WaitFor( dwTimeout : DWORD) : DWORD;
begin
result := WaitForSingleObject( FOverlapped.hEvent, dwTimeout);
end;
{ Base64Utils }
class function Base64Utils.Encode( const src : TBytes; srcOff, len : Integer; dst : TBytes; dstOff : Integer) : Integer;
const ENCODE_TABLE : PAnsiChar = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
begin
ASSERT( len in [1..3]);
dst[dstOff] := Byte( ENCODE_TABLE[ (src[srcOff] shr 2) and $3F]);
case len of
3 : begin
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ ((src[srcOff] shl 4) and $30) or ((src[srcOff + 1] shr 4) and $0F)]);
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ ((src[srcOff + 1] shl 2) and $3C) or ((src[srcOff + 2] shr 6) and $03)]);
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ src[srcOff + 2] and $3F]);
result := 4;
end;
2 : begin
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ ((src[srcOff] shl 4) and $30) or ((src[srcOff + 1] shr 4) and $0F)]);
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ (src[srcOff + 1] shl 2) and $3C]);
result := 3;
end;
1 : begin
Inc(dstOff);
dst[dstOff] := Byte( ENCODE_TABLE[ (src[srcOff] shl 4) and $30]);
result := 2;
end;
else
ASSERT( FALSE);
result := 0; // because invalid call
end;
end;
class function Base64Utils.Decode( const src : TBytes; srcOff, len : Integer; dst : TBytes; dstOff : Integer) : Integer;
const DECODE_TABLE : array[0..$FF] of Integer
= ( -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 );
begin
ASSERT( len in [1..4]);
result := 1;
dst[dstOff] := ((DECODE_TABLE[src[srcOff] and $0FF] shl 2)
or (DECODE_TABLE[src[srcOff + 1] and $0FF] shr 4));
if (len > 2) then begin
Inc( result);
Inc( dstOff);
dst[dstOff] := (((DECODE_TABLE[src[srcOff + 1] and $0FF] shl 4) and $F0)
or (DECODE_TABLE[src[srcOff + 2] and $0FF] shr 2));
if (len > 3) then begin
Inc( result);
Inc( dstOff);
dst[dstOff] := (((DECODE_TABLE[src[srcOff + 2] and $0FF] shl 6) and $C0)
or DECODE_TABLE[src[srcOff + 3] and $0FF]);
end;
end;
end;
class function CharUtils.IsHighSurrogate( const c : Char) : Boolean;
begin
{$IF CompilerVersion < 25.0}
{$IFDEF OLD_UNIT_NAMES}
result := Character.IsHighSurrogate(c);
{$ELSE}
result := System.Character.IsHighSurrogate(c);
{$ENDIF}
{$ELSE}
result := c.IsHighSurrogate();
{$IFEND}
end;
class function CharUtils.IsLowSurrogate( const c : Char) : Boolean;
begin
{$IF CompilerVersion < 25.0}
{$IFDEF OLD_UNIT_NAMES}
result := Character.IsLowSurrogate(c);
{$ELSE}
result := System.Character.IsLowSurrogate(c);
{$ENDIF}
{$ELSE}
result := c.IsLowSurrogate();
{$IFEND}
end;
{$IFDEF Win64}
function InterlockedCompareExchange64( var Target : Int64; Exchange, Comparand : Int64) : Int64; inline;
begin
{$IFDEF OLD_UNIT_NAMES}
result := Windows.InterlockedCompareExchange64( Target, Exchange, Comparand);
{$ELSE}
result := WinApi.Windows.InterlockedCompareExchange64( Target, Exchange, Comparand);
{$ENDIF}
end;
function InterlockedExchangeAdd64( var Addend : Int64; Value : Int64) : Int64;
var old : Int64;
begin
repeat
Old := Addend;
until (InterlockedCompareExchange64( Addend, Old + Value, Old) = Old);
result := Old;
end;
{$ENDIF}
{ EnumUtils<T> }
class function EnumUtils<T>.ToString(const value : Integer) : string;
var pType : PTypeInfo;
begin
pType := PTypeInfo(TypeInfo(T));
if Assigned(pType)
and (pType^.Kind = tkEnumeration)
{$IF CompilerVersion >= 23.0} // TODO: Range correct? What we know is that XE does not offer it, but Rio has it
and (pType^.TypeData^.MaxValue >= value)
and (pType^.TypeData^.MinValue <= value)
{$ELSE}
and FALSE // THRIFT-5048: pType^.TypeData^ member not supported -> prevent GetEnumName() from reading outside the legal range
{$IFEND}
then result := GetEnumName( PTypeInfo(pType), value)
else result := IntToStr(Ord(value));
end;
{ StringUtils<T> }
class function StringUtils<T>.ToString(const value : T) : string;
type PInterface = ^IInterface;
var pType : PTypeInfo;
stos : ISupportsToString;
pIntf : PInterface; // Workaround: Rio does not allow the direct typecast
begin
pType := PTypeInfo(TypeInfo(T));
if Assigned(pType) then begin
case pType^.Kind of
tkInterface : begin
pIntf := PInterface(@value);
if Supports( pIntf^, ISupportsToString, stos) then begin
result := stos.toString;
Exit;
end;
end;
tkEnumeration : begin
case SizeOf(value) of
1 : begin result := EnumUtils<T>.ToString( PShortInt(@value)^); Exit; end;
2 : begin result := EnumUtils<T>.ToString( PSmallInt(@value)^); Exit; end;
4 : begin result := EnumUtils<T>.ToString( PLongInt(@value)^); Exit; end;
else
ASSERT(FALSE); // in theory, this should not happen
end;
end;
end;
end;
result := TValue.From<T>(value).ToString;
end;
{ TThriftStringBuilder }
function TThriftStringBuilder.Append(const Value: TBytes): TStringBuilder;
begin
Result := Append( string( RawByteString(Value)) );
end;
function TThriftStringBuilder.Append( const Value: ISupportsToString): TStringBuilder;
begin
Result := Append( Value.ToString );
end;
end.
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