Revision control
Copy as Markdown
Other Tools
// Utility functions
import type { LocalBaseBlock } from "./LocalBaseBlock";
/**
* Throws an exception if BigInt is not supported
* @throws Throws Error if BigInt is not supported
*/
export function assertBigInt(): void {
if (typeof BigInt === "undefined") {
throw new Error("BigInt is not defined. Your environment doesn't implement BigInt.");
}
}
/**
* Concatenates buffers from the list
* @param buffers List of buffers
* @returns Concatenated buffer
*/
export function concat(buffers: ArrayBuffer[]): ArrayBuffer {
let outputLength = 0;
let prevLength = 0;
// Calculate output length
for (let i = 0; i < buffers.length; i++) {
const buffer = buffers[i];
outputLength += buffer.byteLength;
}
const retView = new Uint8Array(outputLength);
for (let i = 0; i < buffers.length; i++) {
const buffer = buffers[i];
retView.set(new Uint8Array(buffer), prevLength);
prevLength += buffer.byteLength;
}
return retView.buffer;
}
/**
* Check input "Uint8Array" for common functions
* @param baseBlock
* @param inputBuffer
* @param inputOffset
* @param inputLength
* @returns
*/
export function checkBufferParams(baseBlock: LocalBaseBlock, inputBuffer: Uint8Array, inputOffset: number, inputLength: number): boolean {
if (!(inputBuffer instanceof Uint8Array)) {
baseBlock.error = "Wrong parameter: inputBuffer must be 'Uint8Array'";
return false;
}
if (!inputBuffer.byteLength) {
baseBlock.error = "Wrong parameter: inputBuffer has zero length";
return false;
}
if (inputOffset < 0) {
baseBlock.error = "Wrong parameter: inputOffset less than zero";
return false;
}
if (inputLength < 0) {
baseBlock.error = "Wrong parameter: inputLength less than zero";
return false;
}
if ((inputBuffer.byteLength - inputOffset - inputLength) < 0) {
baseBlock.error = "End of input reached before message was fully decoded (inconsistent offset and length values)";
return false;
}
return true;
}