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File buffer chunked processing

For future reference from: http://forum.textdrive.com/viewtopic.php?pid=105585#p105585
(Johan via Bernard)

Reading file buffer in chunks to prevent reaching process memory limits.

File.open("", "wb") do |f|
  while buff = file_field.read(4096)
    f.write(buff)
  end
end
to ruby textdrive io by ajz on Oct 22, 2006
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