Re: LYNX-DEV Form-based file upload in Lynx ?

[Foteos Macrides]

Bae Young Hyun <address@hidden> wrote:
>[...]
>I downloaded the latest version of Lynx, lynx2-6fm.zip.
>The 'CHANGE' file says that handling of forms with 
>ENCTYPE="multipart/form-data" is added. But, even the latest version
>still doesn't support INPUTs with TYPE=="file" or TYPE="range".
>The exact function I need must include 'file' TYPE.
>
>I'm sorry that I don't have enough time to implement that file
>upload function. So, would you tell me the source structure of lynx
>roughly ? Which files or procedures are related to the processing 
>of FORM, especially that with ENCTYPE="multipart/form-data".
>If I add a program module or fixed the existing sources to support
>INPUTs with TYPE=="file", what shell I do ? Would you point out the
>uncompleted part in the sources ?
>
>What do I consider carefully to support 'file' TYPE ?

        First you need to read and understand:
        
   Linkname: RFC 1867
        URL: http://www.ics.uci.edu/pub/ietf/html/rfc1867.txt


The 2.6FM code set has all of the elements and attributes associated
with FORMs and INPUT TYPE="file" in its DTD, as specified in the most
recent IETF RFC for HTML.  The HTML version of that RFC is:

   Linkname: RFC 2070 - HTML Internationalization
        URL: http://www.alis.com:8085/ietf/html/rfc2070.html


The SGML parser invokes HTML_start_element in HTML.c for that, and
under "case HTML_INPUT:", you'll need to understand that code and
expand the section which is presently:

[..]
                } else if (!strcasecomp(I.type, "file")) {
                    if (present[HTML_INPUT_ACCEPT])
                        I.accept = (char *)value[HTML_INPUT_ACCEPT];
                    /*
                     *  Not yet implemented.
                     */
                    if (me->inUnderline == FALSE) {
                        HText_appendCharacter(me->text,
                                              LY_UNDERLINE_START_CHAR);
                    }
                    HTML_put_string(me,"[FILE Input] (Not yet implemented.)");
                    if (me->inUnderline == FALSE) {
                        HText_appendCharacter(me->text,
                                              LY_UNDERLINE_END_CHAR);
                    }
                    HText_DisableCurrentForm();
                    if (TRACE)
                        fprintf(stderr, "HTML: Ignoring TYPE=\"file\"\n");
                    break;
                }
            }
[...]

        The FORM structures are defined and handled in HTForms.h, LYForms.c
and GridText.c.  I've set that all up for eventual implementation of
file uploads in conjunction with ENCTYPE=multipart/formdata handling, but
other enhancements are presently higher in my own todo list.

<BLOCKQUOTE>
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in my spare time,
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 Foteos Macrides            Worcester Foundation for Biomedical Research
 address@hidden         222 Maple Avenue, Shrewsbury, MA 01545
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