https://temlib.org/AtariForumWiki2018/index.php?action=history&feed=atom&title=CrackArt_file_format 2026-10-19T13:26:38Z Revision history for this page on the wiki MediaWiki 1.30.0 https://temlib.org/AtariForumWiki2018/index.php?title=CrackArt_file_format&diff=2799&oldid=prev 2018-06-03T22:50:59Z

<p>1 revision imported</p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr style="vertical-align: top;" lang="en"> <td colspan="1" style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan="1" style="background-color: white; color:black; text-align: center;">Revision as of 22:50, 3 June 2018</td> </tr><tr><td colspan="2" style="text-align: center;" lang="en"><div class="mw-diff-empty">(No difference)</div> </td></tr></table>

AtariWikiSysop https://temlib.org/AtariForumWiki2018/index.php?title=CrackArt_file_format&diff=2798&oldid=prev 2017-01-02T23:47:05Z

<p>New page</p> <p><b>New page</b></p><div>&lt;pre&gt;<br /> CarckArt *.CA1 (low resolution)<br /> *.CA2 (medium resolution)<br /> *.CA3 (high resolution)<br /> <br /> 1 word 'CA' crackart magic<br /> 1 byte compression: 00 = uncompressed, 01 = compressed<br /> 1 byte resolution: 00 = low res, 01 = medium res, 02 = high res<br /> ?? words palette<br /> For low res pictures there are 16 palette entries<br /> For med res pictures there are 4 palette entries<br /> For high res pictures there are 0 palette entries<br /> ?? bytes Picture data:<br /> For uncompressed pictures 32000 bytes follow<br /> For compressed pictures the compressed data follows<br /> <br /> -----------<br /> &lt; 32057 bytes total<br /> <br /> CrackArt data compression:<br /> 1 byte Escape character<br /> 1 byte Delta: initially the 32000 screen memory are <br /> filled with the delta byte<br /> 1 word Offset: offset between two packed bytes;<br /> Offset is added to the current byte position<br /> to calculate the next byte position. When the <br /> next byte position is greater 32000, the next <br /> byte position is the first position of screen <br /> memory not written to<br /> if Offset = 0, the whole screen if filled with <br /> the delta byte, no packed bytes follow<br /> <br /> 1 byte Cmd: Command byte<br /> Cmd &lt;&gt; Escape character: Cmd = one literal byte<br /> Cmd = Escape charater:<br /> read 1 control byte<br /> 0: read one byte, n, and one byte, b;<br /> repeat b (n+1) times<br /> 1: read one word, n, and one byte, b;<br /> repeat b (n+1) times<br /> 2: read one byte, if zero: stop else read <br /> one extra byte and to make word n:<br /> repeat Delta (n+1) times<br /> Escape character: output one escape charater<br /> else: read one byte, b;<br /> repeat b cmd times<br /> Decompression stops when Escape 2,0 is found or 32000 bytes have been written<br /> &lt;/pre&gt;<br /> Back to [[ST Picture Formats]]</div>

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