Re: Ascii or binary file

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#16591

From: Andrue Cope
Date: Thu, 08 May 2003 13:20

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Johnny Liwis,

> How do I know if the file has binary or ascii content ?
>

All you can do is scan the entire files and determine if all the byte 
values lie within the acceptable range for 'ascii content' whatever 
that is.

FWIW we have a routine that does a pretty good job at this kind of 
thing. We use it to decide whether to activate a hex view or text 
view. The decision is based upon the following function:

bool TOTextLineIndexer::IsMainlyTextual()
{
  return !( ( MyFileSize-MyViewableText )>( 3*MyViewableText ) );
}

Where MyViewableText is the count of bytes whose values lie within 
the range 32 (space) to 0x7F.

I can't give particular statistics for success but we use it a lot 
and it chooses the right mode most of the time.

Andrue Cope
[Bicester, UK]

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