Re: Read binary file

From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: Read binary file
Date	2016-03-17 01:04 +0100
Organization	PointedEars Software (PES)
Message-ID	<145821661.4prVZSFEgG@PointedEars.de> (permalink)
References	<nccmg2$kq7$1@gioia.aioe.org>

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Herbert Kleebauer wrote:

> There is a picture (1.jpg) on web server A and I want to make
> a modified version available using a web server B. Because
> of copyright I can't just copy the picture, modify it and
> store it on server B. Instead a html file (test.htm) and
> a data file which describes how the picture has to be
> modified (diff.dat) is stored on server B. When a user
> loads the html file into his browsers, the javascript code
> loads the original picture from server A and the modification
> file from server B, changes the picture and displays it.

Your logic is flawed.  Either there it is a copyright violation to create a 
modified version of the original, or there is not.  If there is a copyright 
violation, then no matter how you create the modified version, the issue 
remains: publishing the modified version would be a copyright violation.
If there is no copyright violation with copying and modifying the original, 
then there is no need to go to great lengths to do the modification.

I suggest that you at least read <https://en.wikipedia.org/wiki/Copyright> 
to get an idea if the publication of the modified version would constitute a 
copyright violation in the first place (I would suggest consulting a 
copyright lawyer as well depending on the presumed value of the original 
work and the fees to be expected from you or the organization you are 
working for in case of a possible copyright violation).

> I'm not familiar with javascript,

There is no javascript.

> but with help of Google
> I hacked together a few lines of code. But it only works if
> all three files are on the same server:
> 
> http://ikomi.de/test/test.htm
> http://ikomi.de/test/1.jpg
> http://ikomi.de/test/diff.dat
> 
> 
> If the picture is on a different server, there seems to be
> an access violation. How can I avoid this violation

You cannot.  The whole point of the Same Origin Policy is to prevent people 
from doing things like what you attempted.

> or in which other way can I read a binary file from a different
> web server into a javascript array.

I know how (it is actually trivial if you think it through), but until I am 
certain that you are not attempting a copyright violation through the back 
door, I will not say.

IANAL.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not cc me. / Bitte keine Kopien per E-Mail.

Thread

Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-16 23:20 +0100
  Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 01:04 +0100
    Re: Read binary file Stefan Weiss <krewecherl@gmail.com> - 2016-03-17 02:34 +0100
      Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 07:56 +0100
    Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-17 08:31 +0100
      Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 19:10 +0100
        Re: Read binary file Stefan Weiss <krewecherl@gmail.com> - 2016-03-17 19:59 +0100
          Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 21:43 +0100
            Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-17 22:36 +0100
              Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 23:15 +0100
              Re: Read binary file Stefan Weiss <krewecherl@gmail.com> - 2016-03-18 00:43 +0100
                Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-18 17:22 +0100
                Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-18 21:14 +0100
                Re: Read binary file Matthias Wiehl <mw@kwarg.de> - 2016-03-19 00:02 +0100
                Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-19 08:48 +0100
                There is no javascript (was: Read binary file) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-19 13:02 +0100
                Re: There is no javascript (was: Read binary file) Mark - <nonemail@spamspamapam.net> - 2016-03-19 14:33 +0000
                Re: There is no javascript (was: Read binary file) Andrew Poulos <ap_prog@hotmail.com> - 2016-03-20 14:30 +1100
                Re: There is no javascript (was: Read binary file) Mark - <nonemail@spamspamapam.net> - 2016-03-20 13:07 +0000
                Re: There is no javascript (was: Read binary file) John Harris <niam@jghnorth.org.uk.invalid> - 2016-03-20 10:39 +0000
                Re: There is no javascript (was: Read binary file) John Harris <niam@jghnorth.org.uk.invalid> - 2016-03-20 11:19 +0000
                Re: There is no javascript (was: Read binary file) Philip Herlihy <thiswillbounceback@you.com> - 2016-03-21 17:06 +0000
                Re: Read binary file Scott Sauyet <scott.sauyet@gmail.com> - 2016-03-22 17:18 -0700
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-23 10:12 +0100
                Re: Read binary file John Harris <niam@jghnorth.org.uk.invalid> - 2016-03-23 16:27 +0000
                Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-24 10:41 +0100
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-24 11:14 +0100
                Re: Read binary file John Harris <niam@jghnorth.org.uk.invalid> - 2016-03-24 11:41 +0000
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-24 13:36 +0100
                Re: Read binary file John Harris <niam@jghnorth.org.uk.invalid> - 2016-03-25 10:07 +0000
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-25 11:28 +0100
                Re: Read binary file "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-03-24 11:31 +0100
                Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-24 12:34 +0100
                Re: Read binary file "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-03-24 17:15 +0100
                Re: Read binary file Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-03-24 11:33 +0000
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-24 11:05 +0100
                Re: Read binary file Scott Sauyet <scott.sauyet@gmail.com> - 2016-03-23 20:16 -0700
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-24 10:36 +0100
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-24 11:18 +0100
                Re: Read binary file Scott Sauyet <scott.sauyet@gmail.com> - 2016-03-27 10:22 -0700
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-28 00:18 +0200
                Re: Read binary file Scott Sauyet <scott.sauyet@gmail.com> - 2016-03-28 05:35 -0700
                Re: Read binary file "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-03-29 00:53 +0200
  Re: Read binary file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-17 02:23 +0100
  Re: Read binary file Herbert Kleebauer <klee@unibwm.de> - 2016-03-17 08:42 +0100
  Re: Read binary file Dr J R Stockton <reply1600@merlyn.demon.co.uk.invalid> - 2016-03-20 22:03 +0000

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