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Re: How to Zip cross-platform from IDL? [message #83972 is a reply to message #83379]

Mon, 15 April 2013 21:50

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

Hi all,

**Spoiler alert**

Here's what we've got for IDL 8.2.3:

FILE_TAR: Input files or directories, output to a tar file or to a memory buffer. Optional GZIP compression. Optional keyword to just get a list of files but don't do any real work.

FILE_UNTAR: Input a tar file or a memory buffer, output all the files/directories. Automatically handles GZIP compression. Optional keyword to just get a list of files but don't do any real work.

FILE_ZIP: Input files or directories, output to a zip file. Optional keyword to just get a list of files but don't do any real work.

FILE_UNZIP: Input a zip file, output all the files/directories. Optional keyword to just get a list of files but don't do any real work.

FILE_GZIP: Input file or files, output each to either gzip file or to a memory buffer.

FILE_GUNZIP: Input gzip file or files, output the uncompressed files or to a memory buffer.

ZLIB_COMPRESS: Input an array of any IDL numeric type, output an array with Deflate compression (with either no header, a ZLIB header, or a GZIP header).

ZLIB_UNCOMPRESS: Input a byte array with compressed data, output an IDL numeric type (given the appropriate type and dimensions).

Note that for all of the FILE* routines, the assumption is that you have files at one end or the other (or both) - you cannot go straight from data to a compressed memory buffer, and then go back to uncompressed data. Instead, if you want to do that, you can just use the raw ZLIB_COMPRESS/UNCOMPRESS routines.

Regarding speed tests, I can TAR and UNTAR about 2000 small files in ~10 seconds on pokey Windows NTFS. On Linux it take 0.45 seconds.

Using ZLIB_COMPRESS/UNCOMPRESS, it takes about 3 seconds to compress/uncompress ~100 MB of data.

Cheers,
Chris
ExelisVIS

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[Message index]

		Re: How to Zip cross-platform from IDL? By: Brian Daniel on Mon, 25 February 2013 06:52
		Re: How to Zip cross-platform from IDL? By: David Fanning on Sat, 23 February 2013 07:44
		Re: How to Zip cross-platform from IDL? By: David Fanning on Fri, 22 February 2013 10:12
		Re: How to Zip cross-platform from IDL? By: Mark Piper on Fri, 22 February 2013 10:09
		Re: How to Zip cross-platform from IDL? By: chris_torrence@NOSPAM on Fri, 22 February 2013 09:50
		Re: How to Zip cross-platform from IDL? By: Heinz Stege on Fri, 22 February 2013 09:11
		Re: How to Zip cross-platform from IDL? By: Klemen on Fri, 22 February 2013 06:37
		Re: How to Zip cross-platform from IDL? By: David Fanning on Fri, 22 February 2013 05:44
		Re: How to Zip cross-platform from IDL? By: timothyja123 on Wed, 27 February 2013 18:41
		Re: How to Zip cross-platform from IDL? By: chris_torrence@NOSPAM on Mon, 15 April 2013 21:50

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