[PATCH 2/3] winemac: Export HTML Format clipboard data to the public.html pasteboard type.

[Sebastian Lackner]

On 13.01.2017 20:36, Ken Thomases wrote:
> Signed-off-by: Ken Thomases <ken at codeweavers.com>
> ---
>  dlls/winemac.drv/clipboard.c | 68 +++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 67 insertions(+), 1 deletion(-)
> 
> diff --git a/dlls/winemac.drv/clipboard.c b/dlls/winemac.drv/clipboard.c
> index fdd1110..49a3ed3 100644
> --- a/dlls/winemac.drv/clipboard.c
> +++ b/dlls/winemac.drv/clipboard.c
> @@ -82,6 +82,7 @@ static CFDataRef export_bitmap_to_bmp(HANDLE data);
>  static CFDataRef export_dib_to_bmp(HANDLE data);
>  static CFDataRef export_enhmetafile(HANDLE data);
>  static CFDataRef export_hdrop_to_filenames(HANDLE data);
> +static CFDataRef export_html(HANDLE data);
>  static CFDataRef export_metafilepict(HANDLE data);
>  static CFDataRef export_text_to_utf8(HANDLE data);
>  static CFDataRef export_unicodetext_to_utf8(HANDLE data);
> @@ -186,7 +187,7 @@ static const struct
>      { wszJFIF,              CFSTR("public.jpeg"),                           import_clipboard_data,          export_clipboard_data },
>      { wszPNG,               CFSTR("public.png"),                            import_clipboard_data,          export_clipboard_data },
>      { wszHTMLFormat,        NULL,                                           import_clipboard_data,          export_clipboard_data },
> -    { wszHTMLFormat,        CFSTR("public.html"),                           import_html,                    NULL,                   TRUE },
> +    { wszHTMLFormat,        CFSTR("public.html"),                           import_html,                    export_html,            TRUE },
>      { CFSTR_SHELLURLW,      CFSTR("public.url"),                            import_utf8_to_text,            export_text_to_utf8 },
>  };
>  
> @@ -522,6 +523,28 @@ static HANDLE create_bitmap_from_dib(HANDLE dib)
>  
>  
>  /**************************************************************************
> + *		get_html_description_field
> + *
> + *  Find the value of a field in an HTML Format description.
> + */
> +static const char* get_html_description_field(const char* data, const char* keyword)
> +{
> +    const char* pos = data;
> +
> +    while (pos && *pos && *pos != '<')
> +    {
> +        if (memcmp(pos, keyword, strlen(keyword)) == 0)

Its not safe to use memcmp, it could read past the terminating \0 of data.

> +            return pos + strlen(keyword);
> +
> +        pos = strchr(pos, '\n');
> +        if (pos) pos++;
> +    }
> +
> +    return NULL;
> +}
> +
> +
> +/**************************************************************************
>   *              import_clipboard_data
>   *
>   *  Generic import clipboard data routine.
> @@ -1141,6 +1164,49 @@ done:
>  
>  
>  /**************************************************************************
> + *              export_html
> + *
> + *  Export HTML Format to public.html data.
> + *
> + * FIXME: We should attempt to add an <a base> tag and convert windows paths.
> + */
> +static CFDataRef export_html(HANDLE handle)
> +{
> +    CFDataRef ret;
> +    const char *data, *field_value;
> +    int fragmentstart, fragmentend;
> +
> +    data = GlobalLock(handle);
> +
> +    /* read the important fields */
> +    field_value = get_html_description_field(data, "StartFragment:");
> +    if (!field_value)
> +    {
> +        ERR("Couldn't find StartFragment value\n");
> +        goto failed;
> +    }
> +    fragmentstart = atoi(field_value);
> +
> +    field_value = get_html_description_field(data, "EndFragment:");
> +    if (!field_value)
> +    {
> +        ERR("Couldn't find EndFragment value\n");
> +        goto failed;
> +    }
> +    fragmentend = atoi(field_value);
> +
> +    /* export only the fragment */
> +    ret = CFDataCreate(NULL, (const UInt8*)&data[fragmentstart], fragmentend - fragmentstart);

Some validation of those offsets wouldn't hurt.

> +    GlobalUnlock(handle);
> +    return ret;
> +
> +failed:
> +    GlobalUnlock(handle);
> +    return NULL;
> +}
> +
> +
> +/**************************************************************************
>   *              export_metafilepict
>   *
>   *  Export a metafile to data.
>