Processing potentially large STDIN data, more than once

Posted by d11wtq on Stack Overflow See other posts from Stack Overflow or by d11wtq
Published on 2010-05-29T03:31:39Z Indexed on 2010/05/29 3:32 UTC
Read the original article Hit count: 367

Filed under:

objective-c

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cocoa

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stdin

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nsinputstream

I'd like to provide an accessor on a class that provides an NSInputStream for STDIN, which may be several hundred megabytes (or gigabytes, though unlikely, perhaps) of data.

When I caller gets this NSInputStream it should be able to read from it without worrying about exhausting the data it contains. In other words, another block of code may request the NSInputStream and will expect to be able to read from it.

Without first copying all of the data into an NSData object which (I assume) would cause memory exhaustion, what are my options for handling this? The returned NSInputStream does not have to be the same instance, it simply needs to provide the same data.

The best I can come up with right now is to copy STDIN to a temporary file and then return NSInputStream instances using that file. Is this pretty much the only way to handle it? Is there anything I should be cautious of if I go the temporary file route?

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