1 files changed, 52 insertions, 0 deletions
diff --git a/general.h b/general.h
new file mode 100644
index 0000000..86370c1
--- /dev/null
+++ b/general.h
@@ -0,0 +1,52 @@
+/*
+ *  general.h
+ *  
+ *
+ *  Created by Alex Marshall on 09/01/30.
+ *  Copyright 2009 __MyCompanyName__. All rights reserved.
+ *
+ */
+
+#define fatal(x)	printf(x); exit(1)
+
+void LZ77Decompress(void *indata, size_t dlen, u8* ret)
+{
+	int inp = 0;
+	u8* data = (u8*)calloc(dlen + 16, 1);
+	memcpy(data, indata, dlen);
+	int i;
+	u8 bitmask;
+	ret = (u8*)calloc(dlen, 256);		// HORRIBLY INEFFICIENT.
+						// FIGURE SOMETHING ELSE OUT
+	int retoff = 0;
+	
+	while(inp < dlen) {
+		bitmask = data[inp];
+		inp++;
+		
+		for(i = 0; i < 8; i++) {
+			if(bitmask & 0x80) {
+				u8 rep = data[inp];
+				u8 repLength = (rep >> 4) + 3;
+				inp++;
+				u16 repOff = data[inp] | ((rep & 0x0F) << 8);
+				inp++;
+				
+				if(repOff <= retoff) {
+					fatal("Offset too high!\nQuitting\n");
+				}
+				
+				while(repLength > 0) {
+					ret[retoff] = ret[(retoff - repOff) - 1];
+					repLength--;
+					retoff++;
+				}
+			}else{
+				ret[retoff] = data[inp];
+				retoff++;
+				inp++;
+			}
+			bitmask = bitmask << 1;
+		}
+	}
+}