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unit Base64;

interface

uses SysUtils, Classes;

type
{$IFDEF UNICODE}
Base64String = AnsiString;
{$ELSE}
Base64String = string;
{$ENDIF}

// °´Ô´³¤¶ÈSourceSize·µ»ØBase64±àÂëËùÐ軺³åÇø×Ö½ÚÊý
function Base64EncodeBufSize(SourceSize: Integer): Integer;
// »ñÈ¡SourecµÄBase64±àÂ룬Base64Buf±ØÐëÓÐ×ã¹»³¤¶È¡£·µ»ØÊµ¼Ê±àÂë×Ö½ÚÊý
function Base64Encode(const Source; SourceSize: Integer; var Base64Buf): Integer; overload;
// ½«Source±àÂëΪBase64×Ö·û´®·µ»Ø `
function Base64Encode(const Source; SourceSize: Integer): Base64String; overload;
// ½«Source´ÓStartPos¿ªÊ¼µÄSize³¤¶ÈµÄÄÚÈÝÔ´±àÂëΪBase64£¬Ð´ÈëÁ÷Dest¡£
// Size=0 ±íʾһֱ±àÂëµ½Îļþβ
procedure Base64Encode(Source, Dest: TStream; StartPos: Int64 = 0; Size: Int64 = 0); overload;
// °Ñ×Ö·û´®Str±àÂëΪBase64×Ö·û´®·µ»Ø
{$IFDEF UNICODE}
function StrToBase64(const Str: AnsiString): Base64String; overload;
function StrToBase64(const Str: string): Base64String; overload;
{$ELSE}
function StrToBase64(const Str: string): Base64String;
{$ENDIF}

// °´¸ø¶¨µÄ±àÂëÔ´SourceºÍ³¤¶ÈSourceSize¼ÆËã²¢·µ»Ø½âÂ뻺³åÇøËùÐè×Ö½ÚÊý
function Base64DecodeBufSize(const Base64Source; SourceSize: Integer): Integer;
// ½«Base64±àÂëÔ´Base64Source½âÂ룬Buf±ØÐëÓÐ×ã¹»³¤¶È¡£·µ»ØÊµ¼Ê½âÂë×Ö½ÚÊý
function Base64Decode(const Base64Source; SourceSize: Integer; var Buf): Integer; overload;
// ½«Source´ÓStartPos¿ªÊ¼µÄSize³¤¶ÈµÄBase64±àÂëÄÚÈݽâÂ룬дÈëÁ÷Dest¡£
// Size=0 ±íʾһֱ½âÂëµ½Îļþβ
procedure Base64Decode(Source, Dest: TStream; StartPos: Int64 = 0; Size: Int64 = 0); overload;
// ½«Base64±àÂëÔ´Base64Source½âÂëΪ×Ö·û´®·µ»Ø
function Base64Decode(const Base64Source; SourceSize: Integer): string; overload;
// °ÑBase64×Ö·û´®Base64Str½âÂëΪ×Ö·û´®·µ»Ø
function Base64ToStr(const Base64Str: Ba


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