mirror of
https://gitlab.com/freepascal.org/fpc/source.git
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176 lines
8.2 KiB
PHP
176 lines
8.2 KiB
PHP
{
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*********************************************************************
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Copyright (C) 2012 Paul Ishenin,
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member of the Free Pascal Development Team
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*********************************************************************
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}
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{$ifndef VER2_4}
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type
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EEncodingError = class(Exception);
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{ TEncoding }
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TEncoding = class
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strict private
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type
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TStandardEncoding = (
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seAnsi,
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seAscii,
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seUnicode,
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seBigEndianUnicode,
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seUTF7,
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seUTF8);
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var
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FStandardEncodings: array[TStandardEncoding] of TEncoding; static;
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class function GetANSI: TEncoding; static;
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class function GetASCII: TEncoding; static;
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class function GetBigEndianUnicode: TEncoding; static;
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class function GetDefault: TEncoding; static;
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class function GetUnicode: TEncoding; static;
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class function GetUTF7: TEncoding; static;
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class function GetUTF8: TEncoding; static;
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class constructor Create;
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class destructor Destroy;
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strict protected
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FIsSingleByte: Boolean;
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FMaxCharSize: Integer;
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function GetByteCount(Chars: PUnicodeChar; CharCount: Integer): Integer; overload; virtual; abstract;
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function GetBytes(Chars: PUnicodeChar; CharCount: Integer; Bytes: PByte; ByteCount: Integer): Integer; overload; virtual; abstract;
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function GetCharCount(Bytes: PByte; ByteCount: Integer): Integer; overload; virtual; abstract;
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function GetChars(Bytes: PByte; ByteCount: Integer; Chars: PUnicodeChar; CharCount: Integer): Integer; overload; virtual; abstract;
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function GetCodePage: Cardinal; virtual; abstract;
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function GetEncodingName: UnicodeString; virtual; abstract;
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public
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class procedure FreeEncodings;
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function Clone: TEncoding; virtual;
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class function Convert(Source, Destination: TEncoding; const Bytes: TBytes): TBytes; overload;
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class function Convert(Source, Destination: TEncoding; const Bytes: TBytes; StartIndex, Count: Integer): TBytes; overload;
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class function IsStandardEncoding(AEncoding: TEncoding): Boolean; static;
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class function GetBufferEncoding(const Buffer: TBytes; var AEncoding: TEncoding): Integer; overload; static;
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class function GetBufferEncoding(const Buffer: TBytes; var AEncoding: TEncoding;
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ADefaultEncoding: TEncoding): Integer; overload; static;
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function GetByteCount(const Chars: TUnicodeCharArray): Integer; overload;
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function GetByteCount(const Chars: TUnicodeCharArray; CharIndex, CharCount: Integer): Integer; overload;
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function GetByteCount(const S: UnicodeString): Integer; overload;
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function GetByteCount(const S: UnicodeString; CharIndex, CharCount: Integer): Integer; overload;
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function GetBytes(const Chars: TUnicodeCharArray): TBytes; overload;
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function GetBytes(const Chars: TUnicodeCharArray; CharIndex, CharCount: Integer): TBytes; overload;
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function GetBytes(const Chars: TUnicodeCharArray; CharIndex, CharCount: Integer;
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const Bytes: TBytes; ByteIndex: Integer): Integer; overload;
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function GetBytes(const S: UnicodeString): TBytes; overload;
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function GetBytes(const S: UnicodeString; CharIndex, CharCount: Integer;
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const Bytes: TBytes; ByteIndex: Integer): Integer; overload;
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function GetCharCount(const Bytes: TBytes): Integer; overload;
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function GetCharCount(const Bytes: TBytes; ByteIndex, ByteCount: Integer): Integer; overload;
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function GetChars(const Bytes: TBytes): TUnicodeCharArray; overload;
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function GetChars(const Bytes: TBytes; ByteIndex, ByteCount: Integer): TUnicodeCharArray; overload;
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function GetChars(const Bytes: TBytes; ByteIndex, ByteCount: Integer;
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const Chars: TUnicodeCharArray; CharIndex: Integer): Integer; overload;
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class function GetEncoding(CodePage: Integer): TEncoding; overload; static;
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class function GetEncoding(const EncodingName: UnicodeString): TEncoding; overload; static;
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function GetMaxByteCount(CharCount: Integer): Integer; virtual; abstract;
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function GetMaxCharCount(ByteCount: Integer): Integer; virtual; abstract;
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function GetPreamble: TBytes; virtual; abstract;
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function GetString(const Bytes: TBytes): UnicodeString; overload;
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function GetString(const Bytes: TBytes; ByteIndex, ByteCount: Integer): UnicodeString; overload;
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property CodePage: Cardinal read GetCodePage;
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property EncodingName: UnicodeString read GetEncodingName;
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property IsSingleByte: Boolean read FIsSingleByte;
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class property ANSI: TEncoding read GetANSI;
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class property ASCII: TEncoding read GetASCII;
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class property BigEndianUnicode: TEncoding read GetBigEndianUnicode;
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class property Default: TEncoding read GetDefault;
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class property Unicode: TEncoding read GetUnicode;
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class property UTF7: TEncoding read GetUTF7;
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class property UTF8: TEncoding read GetUTF8;
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end;
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{ TMBCSEncoding }
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TMBCSEncoding = class(TEncoding)
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strict private
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FCodePage: Integer;
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FMBToWCharFlags: Integer;
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FWCharToMBFlags: Integer;
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strict protected
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function GetByteCount(Chars: PUnicodeChar; CharCount: Integer): Integer; overload; override;
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function GetBytes(Chars: PUnicodeChar; CharCount: Integer; Bytes: PByte; ByteCount: Integer): Integer; overload; override;
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function GetCharCount(Bytes: PByte; ByteCount: Integer): Integer; overload; override;
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function GetChars(Bytes: PByte; ByteCount: Integer; Chars: PUnicodeChar; CharCount: Integer): Integer; overload; override;
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function GetCodePage: Cardinal; override;
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function GetEncodingName: UnicodeString; override;
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public
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constructor Create; overload; virtual;
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constructor Create(ACodePage: Integer); overload; virtual;
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constructor Create(ACodePage, MBToWCharFlags, WCharToMBFlags: Integer); overload; virtual;
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function Clone: TEncoding; override;
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function GetMaxByteCount(CharCount: Integer): Integer; override;
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function GetMaxCharCount(ByteCount: Integer): Integer; override;
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function GetPreamble: TBytes; override;
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end;
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{ TUTF7Encoding }
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TUTF7Encoding = class(TMBCSEncoding)
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public
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constructor Create; override;
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function Clone: TEncoding; override;
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function GetMaxByteCount(CharCount: Integer): Integer; override;
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function GetMaxCharCount(ByteCount: Integer): Integer; override;
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end;
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{ TUTF8Encoding }
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TUTF8Encoding = class(TUTF7Encoding)
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public
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constructor Create; override;
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function Clone: TEncoding; override;
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function GetMaxByteCount(CharCount: Integer): Integer; override;
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function GetMaxCharCount(ByteCount: Integer): Integer; override;
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function GetPreamble: TBytes; override;
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end;
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{ TUnicodeEncoding }
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TUnicodeEncoding = class(TEncoding)
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strict protected
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function GetByteCount(Chars: PUnicodeChar; CharCount: Integer): Integer; overload; override;
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function GetBytes(Chars: PUnicodeChar; CharCount: Integer; Bytes: PByte; ByteCount: Integer): Integer; overload; override;
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function GetCharCount(Bytes: PByte; ByteCount: Integer): Integer; overload; override;
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function GetChars(Bytes: PByte; ByteCount: Integer; Chars: PUnicodeChar; CharCount: Integer): Integer; overload; override;
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function GetCodePage: Cardinal; override;
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function GetEncodingName: UnicodeString; override;
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public
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constructor Create; virtual;
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function Clone: TEncoding; override;
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function GetMaxByteCount(CharCount: Integer): Integer; override;
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function GetMaxCharCount(ByteCount: Integer): Integer; override;
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function GetPreamble: TBytes; override;
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end;
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{ TBigEndianUnicodeEncoding }
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TBigEndianUnicodeEncoding = class(TUnicodeEncoding)
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strict protected
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function GetBytes(Chars: PUnicodeChar; CharCount: Integer; Bytes: PByte; ByteCount: Integer): Integer; overload; override;
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function GetChars(Bytes: PByte; ByteCount: Integer; Chars: PUnicodeChar; CharCount: Integer): Integer; overload; override;
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function GetCodePage: Cardinal; override;
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function GetEncodingName: UnicodeString; override;
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public
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function Clone: TEncoding; override;
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function GetPreamble: TBytes; override;
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end;
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{$endif VER2_4}
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