[Lazarus] Base64 broken in json?

[Michael Van Canneyt]

On Tue, 2 Jun 2015, "Leonardo M. Ramé" wrote:

>
>
> El 02/06/15 a las 04:20, Michael Van Canneyt escibió:
>> 
>> 
>> On Mon, 1 Jun 2015, "Leonardo M. Ramé" wrote:
>> 
>>> El 30/05/15 a las 13:29, silvioprog escibió:
>>>> On Sat, May 30, 2015 at 12:14 PM, "Leonardo M. Ramé" <l.rame at griensu.com
>>>> <mailto:l.rame at griensu.com>> wrote:
>>>> 
>>>> 
>>>> [Window Title]
>>>> project1
>>>> 
>>>> [Content]
>>>> { "var1" : "bGVvbmFyZG8=" } - leonardo
>>>> 
>>>> [OK]
>>>> 
>>>> But after take a look at your code, it seems better to use as:
>>>> 
>>>> myString := '{ "var1": "' + StringToJsonString(Base64EncodedString) +
>>>> '" }'
>>>> 
>>>> Because function "StringToJsonString" will encode string in a
>>>> JSON-escape string.
>>>> 
>>> 
>>> Hi Silvio, can you try encoding the attached file, then output using
>>> both methods?.
>> 
>> I tested your file with the following program:
>> 
>> program jsonb;
>> 
>> uses sysutils, classes, fpjson, jsonparser, base64;
>> 
>> Var
>>    O : TJSONObject;
>>    F : TFileStream;
>>    S : TStringStream;
>> 
>> begin
>>    S:=Nil;
>>    O:=Nil;
>>    try
>>      F:=TFileStream.Create(ParamStr(1),fmOpenRead);
>>      S:=TStringStream.Create('');
>>      With TBase64EncodingStream.Create(S) do
>>        try
>>          CopyFrom(F,0);
>>          Flush;
>>          O:=TJSONObject.Create(['file',S.DataString]);
>>        finally
>>          Free;
>>        end;
>>      FreeAndNil(S);
>>      S:=TStringStream.Create(O.Get('file'));
>>      S.Position:=0;
>>      FreeAndNil(F);
>>      F:=TFileStream.Create(ChangeFileExt(paramstr(1),'.base64'),fmCreate);
>>      F.CopyFrom(S,0);
>>    finally
>>      O.Free;
>>      F.Free;
>>      S.Free;
>>    end;
>> end.
>> 
>> cadwal: >./jsonb plantilla-original.ott
>> cadwal: >base64 -d plantilla-original.base64 > b.ott
>> cadwal: >ls *.ott -l
>> -rw-rw-r-- 1 michael michael 41956 Jun  2 09:16 b.ott
>> -rw-rw-r-- 1 michael michael 41956 Jun  2 09:05 plantilla-original.ott
>> cadwal: >cmp b.ott plantilla-original.ott
>> 
>> cmp reports all is well.
>> 
>> Michael.
>> 
>> 
>
> Thanks Michael, what if you save the json object to file using:
>
> with TStringList.Create do
> begin
>  Text := O.AsJson;
>  SaveToFile('test.json');
> end;
>
> Then copy the content of the "file" variable, and save as test.base64?

You cannot copy&paste that, because there may be escaped characters in it.
If you are doing that, you are doing it wrong.

Michael.