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Updated a range of operations to use ArrayBuffers instead of byteArrays to improve performance with large files.

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This commit is contained in:
n1474335 2019-07-29 17:09:46 +01:00
parent 3a8b362dfd
commit 0e95ad8ed6
37 changed files with 112 additions and 84 deletions
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11
src/core/operations/BitShiftRight.mjs
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@ -21,8 +21,8 @@ class BitShiftRight extends Operation {
this.module = "Default";
this.description = "Shifts the bits in each byte towards the right by the specified amount.<br><br><i>Logical shifts</i> replace the leftmost bits with zeros.<br><i>Arithmetic shifts</i> preserve the most significant bit (MSB) of the original byte keeping the sign the same (positive or negative).";
this.infoURL = "https://wikipedia.org/wiki/Bitwise_operation#Bit_shifts";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.args = [
{
"name": "Amount",
@ -38,18 +38,19 @@ class BitShiftRight extends Operation {
}
/**
* @param {byteArray} input
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
* @returns {ArrayBuffer}
*/
run(input, args) {
const amount = args[0],
type = args[1],
mask = type === "Logical shift" ? 0 : 0x80;
input = new Uint8Array(input);
return input.map(b => {
return (b >>> amount) ^ (b & mask);
});
}).buffer;
}
/**