big b0i

1 files changed, 56 insertions, 0 deletions

diff --git a/src/js/libu8.js b/src/js/libu8.js
new file mode 100644
index 0000000..b619fd8
--- /dev/null
+++ b/src/js/libu8.js
@@ -0,0 +1,56 @@
+/*
+ *  turn a uint32_t into a little-endian 4 byte array
+ */
+function u32_to_u8x4(val) {
+	u8x4 = new Uint8Array(0x4);
+
+	val_ = val >>> 0;
+
+	u8x4[0] = ((val_ >>  0) & 0xff);
+	u8x4[1] = ((val_ >>  8) & 0xff);
+	u8x4[2] = ((val_ >> 16) & 0xff);
+	u8x4[3] = ((val_ >> 24) & 0xff);
+
+	return u8x4;
+}
+
+/*
+ *  turn a uint16_t into a little-endian 2 byte array
+ */
+function u16_to_u8x2(val) {
+	u8x2 = new Uint8Array(0x2);
+
+	val_ = val >>> 0;
+
+	u8x2[0] = ((val_ >>  0) & 0xff);
+	u8x2[1] = ((val_ >>  8) & 0xff);
+
+	return u8x2;
+}
+
+/*
+ *  turn a little-endian 4 byte array into a uint32_t
+ */
+function u8x4_to_u32(buf) {
+	u32  = 0x0;
+
+	u32 += (buf[0] <<  0);
+	u32 += (buf[1] <<  8);
+	u32 += (buf[2] << 16);
+	u32 += (buf[3] << 24);
+
+	return u32 >>> 0;
+}
+
+/*
+ *  turn a little-endian 2 byte array into a uint16_t
+ */
+function u8x2_to_u16(buf) {
+	u16  = 0x0;
+
+	u16 += (buf[0] <<  0);
+	u16 += (buf[1] <<  8);
+
+	return u16 >>> 0;
+
+}