@kotevode/ffjavascript/src/engine_batchconvert.js

Finite Field Library in Javascript

import BigBuffer from "./bigbuffer.js";

export default function buildBatchConvert(tm, fnName, sIn, sOut) {
    return async function batchConvert(buffIn) {
        const nPoints = Math.floor(buffIn.byteLength / sIn);
        if ( nPoints * sIn !== buffIn.byteLength) {
            throw new Error("Invalid buffer size");
        }
        const pointsPerChunk = Math.floor(nPoints/tm.concurrency);
        const opPromises = [];
        for (let i=0; i<tm.concurrency; i++) {
            let n;
            if (i< tm.concurrency-1) {
                n = pointsPerChunk;
            } else {
                n = nPoints - i*pointsPerChunk;
            }
            if (n==0) continue;

            const buffChunk = buffIn.slice(i*pointsPerChunk*sIn, i*pointsPerChunk*sIn + n*sIn);
            const task = [
                {cmd: "ALLOCSET", var: 0, buff:buffChunk},
                {cmd: "ALLOC", var: 1, len:sOut * n},
                {cmd: "CALL", fnName: fnName, params: [
                    {var: 0},
                    {val: n},
                    {var: 1}
                ]},
                {cmd: "GET", out: 0, var: 1, len:sOut * n},
            ];
            opPromises.push(
                tm.queueAction(task)
            );
        }

        const result = await Promise.all(opPromises);

        let fullBuffOut;
        if (buffIn instanceof BigBuffer) {
            fullBuffOut = new BigBuffer(nPoints*sOut);
        } else {
            fullBuffOut = new Uint8Array(nPoints*sOut);
        }

        let p =0;
        for (let i=0; i<result.length; i++) {
            fullBuffOut.set(result[i][0], p);
            p+=result[i][0].byteLength;
        }

        return fullBuffOut;
    };
}