Added 'Bit shift left' and 'Bit shift right' operations

This commit is contained in:
n1474335 2017-09-05 14:26:09 +00:00
parent 5fcc259efb
commit 1b628ac213
7 changed files with 143 additions and 14 deletions

View file

@ -228,6 +228,46 @@ const BitwiseOp = {
},
/**
* Bit shift left operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runBitShiftLeft: function(input, args) {
const amount = args[0];
return input.map(b => {
return (b << amount) & 0xff;
});
},
/**
* @constant
* @default
*/
BIT_SHIFT_TYPE: ["Logical shift", "Arithmetic shift"],
/**
* Bit shift right operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runBitShiftRight: function(input, args) {
const amount = args[0],
type = args[1],
mask = type === "Logical shift" ? 0 : 0x80;
return input.map(b => {
return (b >>> amount) ^ (b & mask);
});
},
/**
* XOR bitwise calculation.
*

View file

@ -196,7 +196,7 @@ const ByteRepr = {
/**
* Highlight to hex
* Highlight from hex
*
* @param {Object[]} pos
* @param {number} pos[].start

View file

@ -20,7 +20,7 @@ const Rotate = {
* @constant
* @default
*/
ROTATE_WHOLE: false,
ROTATE_CARRY: false,
/**
* Runs rotation operations across the input data.
@ -53,7 +53,7 @@ const Rotate = {
*/
runRotr: function(input, args) {
if (args[1]) {
return Rotate._rotrWhole(input, args[0]);
return Rotate._rotrCarry(input, args[0]);
} else {
return Rotate._rot(input, args[0], Rotate._rotr);
}
@ -69,7 +69,7 @@ const Rotate = {
*/
runRotl: function(input, args) {
if (args[1]) {
return Rotate._rotlWhole(input, args[0]);
return Rotate._rotlCarry(input, args[0]);
} else {
return Rotate._rot(input, args[0], Rotate._rotl);
}
@ -197,7 +197,7 @@ const Rotate = {
* @param {number} amount
* @returns {byteArray}
*/
_rotrWhole: function(data, amount) {
_rotrCarry: function(data, amount) {
let carryBits = 0,
newByte,
result = [];
@ -223,7 +223,7 @@ const Rotate = {
* @param {number} amount
* @returns {byteArray}
*/
_rotlWhole: function(data, amount) {
_rotlCarry: function(data, amount) {
let carryBits = 0,
newByte,
result = [];