DZone Snippets: zip code

Create ZIP files on the fly

erral (Mikel) — Fri, 16 Feb 2007 11:50:15 GMT

// description of your code here



    def createZIP(self, startdate, enddate):

        """ Create the XTG file and the photos in a ZIP file """

        from StringIO import StringIO

        xtgString = StringIO()

        photofiles = []

        zorionagurrak = self.getZorionAgurrak(startdate, enddate)



        xtgString.write('\r')

        for zorionagurra in zorionagurrak:

            a = self.createZorionAgurraXTG(zorionagurra).getvalue()

            xtgString.write(a)

            photofiles.append((zorionagurra['id'], zorionagurra['photo']))

            

        zipfile = self.appendFiles(xtgString, photofiles)



        request = self.request



        request.response.setHeader('Content-Type', 'application/zip')

        request.response.setHeader('Content-Disposition', 'attachment; filename=zorionagurrak.zip')

        request.response.write(zipfile.getvalue())

        return request.response

Adding files to an existing jar file

jknight (Andrian) — Wed, 07 Feb 2007 14:00:10 GMT

Adds files to an existing Zip file.

Overwrites zip entries with the same name as one of the new files.

The function renames the existing zip file to a temporary file and then adds all entries in the existing zip along with the new files, excluding the zip entries that have the same name as one of the new files.

Note: I'm not sure I used the best way to get a temp file. A snippet for that is welcome :)

	

	public static void addFilesToExistingZip(File zipFile,

			 File[] files) throws IOException {

                // get a temp file

		File tempFile = File.createTempFile(zipFile.getName(), null);

                // delete it, otherwise you cannot rename your existing zip to it.

		tempFile.delete();



		boolean renameOk=zipFile.renameTo(tempFile);

		if (!renameOk)

		{

			throw new RuntimeException("could not rename the file "+zipFile.getAbsolutePath()+" to "+tempFile.getAbsolutePath());

		}

		byte[] buf = new byte[1024];

		

		ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));

		ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));

		

		ZipEntry entry = zin.getNextEntry();

		while (entry != null) {

			String name = entry.getName();

			boolean notInFiles = true;

			for (File f : files) {

				if (f.getName().equals(name)) {

					notInFiles = false;

					break;

				}

			}

			if (notInFiles) {

				// Add ZIP entry to output stream.

				out.putNextEntry(new ZipEntry(name));

				// Transfer bytes from the ZIP file to the output file

				int len;

				while ((len = zin.read(buf)) > 0) {

					out.write(buf, 0, len);

				}

			}

			entry = zin.getNextEntry();

		}

		// Close the streams		

		zin.close();

		// Compress the files

		for (int i = 0; i < files.length; i++) {

			InputStream in = new FileInputStream(files[i]);

			// Add ZIP entry to output stream.

			out.putNextEntry(new ZipEntry(files[i].getName()));

			// Transfer bytes from the file to the ZIP file

			int len;

			while ((len = in.read(buf)) > 0) {

				out.write(buf, 0, len);

			}

			// Complete the entry

			out.closeEntry();

			in.close();

		}

		// Complete the ZIP file

		out.close();

		tempFile.delete();

	}

unix, pack folder and contents with tar gz

assbach (assbach) — Mon, 04 Dec 2006 16:28:02 GMT



tar -zcvf packagename.tar.gz folder/

Create a single JPG gallery from an image archive

madphilosopher (Darren Paul Griffith) — Wed, 09 Nov 2005 07:05:13 GMT

The following comes from Jason Scott and is posted here with permission under the Creative Commons Attribution-ShareAlike License.

The script expands a zip or rar archive of images, makes thumbnails, and compiles the thumbnails into a single JPG to represent what's in the archive. Requires ImageMagick.

Code:



#!/bin/sh

# GALLERATE: Turn a zip of images into a gallery.

# From Jason Scott. http://ascii.textfiles.com/archives/000137.html

if [ -f "$1" ]

   then

   rm -rf .galleryworld

   echo "[%] Preparting to squat out $1...."

   mkdir .galleryworld

   cd .galleryworld

   unzip -j "../$1"

   unrar e -ep "../$1"

   echo "[%] WHY DOES IT HURT!!!!"

   montage +frame +shadow +label -tile 7 *.JPG *.GIF *.gif *.jpg *.bmp *.png *.PNG *.BMP "../$1.jpg"

   cd ..

   rm -rf .galleryworld

   ls -l "$1.jpg"

  else

  echo "No such file, assmaster."

fi

Usage:



GALLERATE [file]

where [file] is the zip or rar archive of images to be processed.

Reading from a zip file

korakot (Korakot Chaovavanich) — Sun, 18 Sep 2005 15:14:11 GMT



import zipfile



z = zipfile.ZipFile("zipfile.zip", "r")

for filename in z.namelist():

        print filename

        bytes = z.read(filename)

        print len(bytes)

Zip two Arrays together into a Hash

Babbage (Patrick Hall) — Tue, 21 Jun 2005 15:08:49 GMT

Found this here:

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/122906

 

def Hash.from_pairs_e(keys,values)

  hash = {}

  keys.size.times { |i| hash[ keys[i] ] = values[i] }

  hash

end