35 lines
855 B
TypeScript
35 lines
855 B
TypeScript
export class NibbleArray {
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private array:Uint8Array;
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public constructor(size:number|ArrayBuffer|Uint8Array) {
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if (size instanceof ArrayBuffer) {
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this.array = new Uint8Array(size);
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} else if (size instanceof Uint8Array) {
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this.array = new Uint8Array(size);
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} else {
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this.array = new Uint8Array(size >> 1);
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}
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}
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public get(index:number) {
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const arrayIndex = index >> 1;
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if ((index & 1) === 0) {
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return this.array[arrayIndex] & 0xf;
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} else {
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return this.array[arrayIndex] >> 4 & 0xf;
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}
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}
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public set(index:number, value:number) {
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const arrayIndex = index >> 1;
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if ((index & 1) === 0) {
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this.array[arrayIndex] = this.array[arrayIndex] & 0xf0 | value & 0xf;
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} else {
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this.array[arrayIndex] = this.array[arrayIndex] & 0xf | (value & 0xf) << 4;
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}
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}
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public toBuffer() {
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return Buffer.from(this.array);
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}
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} |