Initial stab at Venti.

src/cmd/venti/score.c

@@ -0,0 +1,43 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+u8int zeroscore[VtScoreSize];
+
+void
+scoremem(u8int *score, u8int *buf, int n)
+{
+	DigestState s;
+
+	memset(&s, 0, sizeof s);
+	sha1(buf, n, score, &s);
+}
+
+static int
+hexv(int c)
+{
+	if(c >= '0' && c <= '9')
+		return c - '0';
+	if(c >= 'a' && c <= 'f')
+		return c - 'a' + 10;
+	if(c >= 'A' && c <= 'F')
+		return c - 'A' + 10;
+	return -1;
+}
+
+int
+strscore(char *s, u8int *score)
+{
+	int i, c, d;
+
+	for(i = 0; i < VtScoreSize; i++){
+		c = hexv(s[2 * i]);
+		if(c < 0)
+			return -1;
+		d = hexv(s[2 * i + 1]);
+		if(d < 0)
+			return -1;
+		score[i] = (c << 4) + d;
+	}
+	return s[2 * i] == '\0';
+}