zlib performance

[yawniek via Digitalmars-d-learn]

On Friday, 7 August 2015 at 07:43:25 UTC, Daniel Kozák wrote:

>> i don't understand why the program crashes when i do not do 
>> the .dup
> This is weird. I would say it should not crash
exactely. but try it yourself.

the fastest version i could come up so far is below.
std.conv slows it down.
going from a 4kb to a 4mb buffer helped. now i'm within 30% of 
gzcat's performance.

import
   std.zlib,
   std.file,
   std.stdio;

void main(string[] args)
{
   auto f = File(args[1], "rb");
   auto uncompressor = new UnCompress(HeaderFormat.gzip);

   foreach (ubyte[] buffer; f.byChunk(1024*1024*4))
   {
           auto uncompressed = cast(immutable(string)) 
uncompressor.uncompress(buffer.dup);
           write(uncompressed);
   }
}