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Max Horn
79 lines
2.3 KiB
HTML
79 lines
2.3 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>SCUMM Block Specifications Format</TITLE>
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<META NAME="resource-type" CONTENT="document">
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</HEAD>
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<FONT SIZE="+2" FACE="Arial">
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<B>SCUMM Block Specifications Format</B>
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</FONT><P>
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<FONT FACE="Arial" SIZE="-1">
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Each block specification contains a general description of the block and
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a table of the exact ordering of data within the block. The first column
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in these tables either contains a string literal (for example the block
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name "APAL") or an identifier (made up by me) written in
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hungarian notation.<P>
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The second column contains the size/format of the data meaning the
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following:<P>
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<UL>
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<LI>byte - Yep, a byte.
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<LI>word - 2 bytes
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<LI>dword - 4 bytes
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<LI>char - basically a byte, but used for character contents.
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<LI>string - null-terminated string, i.e. a string of chars ended with a
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byte of the value 0. Normally, char will be used for strings containing
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a known number of chars, while string will be used where the length
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of the string is variable.
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<LI>block - SCUMM format block.
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</UL>
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Some of these may be prepended a multiplier, such as "5 *", which
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means what you think it does.<P>
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The third column contains a description of the data. In this, some
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abbreviations are used:<P>
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<UL>
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<LI>BE - Big Endian, i.e. the number is stored with the most significant
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byte <B>first</B> (as most normal people would write it, no offense to Intel).
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Also known as Motorola format.
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<LI>LE - Little Endian, i.e. the number is stored with the most significant
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byte <B>last</B>. Also known as Intel format.
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</UL>
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If nothing is noted, the number is stored as Big Endian.<P>
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Special schemes are used for special instances, such as a piece of the spec
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being repeated for a specified number of times:<BR>
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<B>loop <<I>count</I>></B><BR>
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...<BR>
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<B>end of loop</B><P>
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- or an unspecified number of times:<BR>
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<B>loop</B><BR>
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...<BR>
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<B>end of loop</B><P>
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Also, if a piece of the spec may not occur in some instances, it's marked
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thusly:<BR>
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<B>(</B><BR>
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...<BR>
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<B>)</B><P>
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Finally, if a piece can be different in some instances, it's marked with:<BR>
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<B>{</B><BR>
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...<BR>
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<B>}<BR>
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or<BR>
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{</B><BR>
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...<BR>
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<B>}</B><P>
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</FONT>
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</BODY>
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</HTML>
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