Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <h1>Solution without writing your own GIF reader</h1> <p>For uses other than your own edification, try this.</p> <h2>A few notes</h2> <ul> <li>Your GIF file is GIF89a. You linked to the GIF87a specification; the <a href="http://www.w3.org/Graphics/GIF/spec-gif89a.txt" rel="nofollow noreferrer">89a specification is here</a>.</li> <li>You're seem to be concerned that using a library to parse the image will hurt performance. This makes no sense. The libraries are generally implemented in optimized C; your hand-rolled solution would be written in PHP, an interpreted language.</li> <li>You mentioned PCX, which libraries like imagemagick do support.</li> </ul> <h2>Or just use PNG</h2> <p>According to the <a href="http://www.zebra.com/id/zebra/na/en/documentlibrary/manuals/en/zpl_ii_programming2.html" rel="nofollow noreferrer">ZPL 2 programming manual</a>, PNG is supported. For example, the <code>~DY</code> (Download Graphics) command takes a <code>b</code> (format) parameter, for which <code>P</code> (PNG) is an option, besides the default GRF. See also <a href="https://stackoverflow.com/questions/8818688/printing-images-png-to-a-network-zebra-printer-zpl-z64-b64">Printing PNG images to a zebra network printer</a>.</p> <p>There are <em>lots</em> of libraries for converting GIF to PNG. You could use <a href="http://www.php.net/imagick" rel="nofollow noreferrer">ImageMagick (PHP binding)</a>, or just use the PHP functions <a href="http://www.php.net/imagecreatefromgif" rel="nofollow noreferrer"><code>imagecreatefromgif</code></a> and <a href="http://www.php.net/imagepng" rel="nofollow noreferrer"><code>imagepng</code></a>.</p>
    singulars
    1. This table or related slice is empty.
    1. POParsing GIF Raster Data - LZW
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USMechanical snail
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe point of the bounty is how to do the decompression. I've looked through source files including the one you've mentioned and I still have trouble doing the decompression. Regardless of optimization, etc, none of these responses answer the actual question.
      singulars
      1. PO
      1. USteynon
    2. CO@Tom: You haven't explained *why* you need to do the decompression yourself.
      singulars
      1. PO
      1. USMechanical snail
    3. COThe reason why doesn't matter. I'd like to know how it's done.
      singulars
      1. PO
      1. USteynon
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload