feat(binary): add MSB_BITS8/16/32 LUTs

thi-ng · Feb 7, 2021 · e0eb47b · e0eb47b
1 parent ed66a64
commit e0eb47b
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/packages/binary/src/constants.ts b/packages/binary/src/constants.ts
@@ -1 +1,18 @@
+const defBits = (n: number) =>
+    new Array(n).fill(0).map((_, i) => 1 << (n - 1 - i));
+/**
+ * 8bit values in MSB order (i.e. MSB_BITS[0] = 0x80)
+ */
+export const MSB_BITS8 = defBits(8);
+
+/**
+ * 16bit values in MSB order (i.e. MSB_BITS[0] = 0x8000)
+ */
+export const MSB_BITS16 = defBits(16);
+
+/**
+ * 32bit values in MSB order (i.e. MSB_BITS[0] = 0x80000000)
+ */
+export const MSB_BITS32 = defBits(32);
+
 export const MASKS = new Array(33).fill(0).map((_, i) => Math.pow(2, i) - 1);