diff options
Diffstat (limited to 'js/libu8.js')
| -rw-r--r-- | js/libu8.js | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/js/libu8.js b/js/libu8.js new file mode 100644 index 0000000..fb0b46a --- /dev/null +++ b/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;
+
+}
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