[PD] Looking for a way to add bytes to beginning of a file using [binfile]

Jamie Bullock jamie at postlude.co.uk
Sat Sep 22 12:41:09 CEST 2012

On 20 Sep 2012, at 17:33, Antonio Roberts <antonio at hellocatfood.com> wrote:

> I'm attempting to use [binfile] to add additional bytes to a file. If
> I first read the file - using [read(  - and then specify the write
> position -  [writeat 0 ( - when I add bytes they _overwrite_ the
> already existing bytes instead of adding new ones.
> Previously I have used one [binfile] object to read a file output each
> byte of it to another [binfile] object. This method has worked great
> for small files but when I'm faced with 60mb files it takes far too
> long!
> Is there a way to add bytes to the beginning of a file without overwriting?

DId you solve this in the end?

[binfile] could be trivially extended to allow an |insert( method, which inserts bytes without overwriting. However, I suspect this kind of insert operation is going to be relatively inefficient even if it's done on the C side.

Another option, as I suggested off-list is to use [shell] + "cat", but this isn't portable.

Something else you could explore is using [pdlua] and a bit of Lua script: http://www.lua.org/pil/21.2.2.html

For the sort of work you're doing it wouldn't hurt to incorporate pdlua into your toolbox anyhow.



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