From 37da2899f40661e3e9631e497da8dc59b971cbd0 Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 17:07:39 +0000
Subject: 20060303a

---
 libdraw/computil.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 libdraw/computil.c

(limited to 'libdraw/computil.c')

diff --git a/libdraw/computil.c b/libdraw/computil.c
new file mode 100644
index 00000000..3ec103b8
--- /dev/null
+++ b/libdraw/computil.c
@@ -0,0 +1,37 @@
+#include "lib9.h"
+#include "draw.h"
+
+/*
+ * compressed data are seuences of byte codes.  
+ * if the first byte b has the 0x80 bit set, the next (b^0x80)+1 bytes
+ * are data.  otherwise, it's two bytes specifying a previous string to repeat.
+ */
+void
+_twiddlecompressed(uchar *buf, int n)
+{
+	uchar *ebuf;
+	int j, k, c;
+
+	ebuf = buf+n;
+	while(buf < ebuf){
+		c = *buf++;
+		if(c >= 128){
+			k = c-128+1;
+			for(j=0; j<k; j++, buf++)
+				*buf ^= 0xFF;
+		}else
+			buf++;
+	}
+}
+
+int
+_compblocksize(Rectangle r, int depth)
+{
+	int bpl;
+
+	bpl = bytesperline(r, depth);
+	bpl = 2*bpl;	/* add plenty extra for blocking, etc. */
+	if(bpl < NCBLOCK)
+		return NCBLOCK;
+	return bpl;
+}
-- 
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