68 lines
1.8 KiB
TypeScript
68 lines
1.8 KiB
TypeScript
DataView.prototype.add = function (offset) {
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return new DataView(this.buffer, offset);
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};
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DataView.prototype.writeU8 = function (val) {
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return this.setUint8(0, val);
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};
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DataView.prototype.writeU16 = function (val) {
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return this.setUint16(0, val);
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};
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DataView.prototype.writeU32 = function (val) {
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return this.setUint32(0, val);
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};
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DataView.prototype.writeU64 = function (val) {
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return this.setUint64(0, val);
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};
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DataView.prototype.readU8 = function () {
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return this.getUint8(0);
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};
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DataView.prototype.readU16 = function () {
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return this.getUint16(0);
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};
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DataView.prototype.readU32 = function () {
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return this.getUint32(0);
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};
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DataView.prototype.readU64 = function () {
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return this.getUint64(0);
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};
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const isU8Array = (x: Uint8Array | number[]): x is Uint8Array => {
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return x instanceof Uint8Array;
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};
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DataView.prototype.writeByteArray = function (arr) {
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const len = isU8Array(arr) ? arr.byteLength : arr.length;
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for (let i = 0; i < len; i++) {
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this.setUint8(i, arr[i]);
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}
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};
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DataView.prototype.readByteArray = function (len) {
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let ret = new DataView(new ArrayBuffer(len));
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for (let i = 0; i < len; i++) {
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ret.setUint8(i, this.getUint8(i));
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}
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return ret;
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};
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const Memory = {
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alloc: (len: number) => new DataView(new ArrayBuffer(len + 1)),
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copy: (outbuf: DataView, inbuf: DataView, len: number) =>
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outbuf.writeByteArray(new Uint8Array(inbuf.readByteArray(len).buffer)),
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};
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declare global {
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interface DataView {
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add(offset: number): DataView;
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readByteArray(len: number): DataView;
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readU16(): undefined;
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readU32(): undefined;
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readU64(): undefined;
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readU8(): undefined;
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writeByteArray(arr: Uint8Array | number[]): undefined;
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writeU16(n: number): undefined;
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writeU32(n: number): undefined;
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writeU64(n: number): undefined;
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writeU8(n: number): undefined;
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}
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}
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export default global;
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