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fastfile

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This commit is contained in:
Jordi Baylina
2020-04-19 18:38:10 +02:00
parent 8c4980c3f9
commit 7fc457ac90
3 changed files with 26 additions and 19 deletions
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30
src/r1csfile.js
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@@ -1,16 +1,15 @@
const fs = require("fs");
const fastFile = require("fastfile");
const assert = require("assert");
const Scalar = require("ffjavascript").Scalar;
module.exports.buildR1cs = buildR1cs;
async function buildR1cs(ctx, fileName) {
const fd = await fs.promises.open(fileName, "w");
const fd = await fastFile.createOverride(fileName);
await fd.write("r1cs"); // Magic "r1cs"
await fd.write(Buffer.from("r1cs"), 0); // Magic "r1cs"
let p = 4;
await writeU32(1); // Version
@@ -53,7 +52,6 @@ async function buildR1cs(ctx, fileName) {
for (let i=0; i<ctx.constraints.length; i++) {
if ((ctx.verbose)&&(i%10000 == 0)) {
if (ctx.verbose) console.log("writing constraint: ", i);
await fd.datasync();
}
await writeConstraint(ctx.constraints[i]);
}
@@ -89,19 +87,22 @@ async function buildR1cs(ctx, fileName) {
await writeU32(constraintsSize, pConstraintsSize);
await writeU32(mapSize, pMapSize);
await fd.sync();
await fd.close();
async function writeU32(v, pos) {
let o = (typeof pos == "undefined") ? p : pos;
const b = Buffer.allocUnsafe(4);
b.writeInt32LE(v);
await fd.write(b, 0, 4, pos);
await fd.write(b, o);
if (typeof(pos) == "undefined") p += 4;
}
async function writeU64(v, pos) {
let o = (typeof pos == "undefined") ? p : pos;
const b = Buffer.allocUnsafe(8);
const LSB = v & 0xFFFFFFFF;
@@ -109,7 +110,7 @@ async function buildR1cs(ctx, fileName) {
b.writeInt32LE(LSB, 0);
b.writeInt32LE(MSB, 4);
await fd.write(b, 0, 8, pos);
await fd.write(b, o);
if (typeof(pos) == "undefined") p += 8;
}
@@ -134,16 +135,15 @@ async function buildR1cs(ctx, fileName) {
}
async function writeBigInt(n, pos) {
const b = Buffer.allocUnsafe(n8);
const dwords = Scalar.toArray(n, 0x100000000);
let o = (typeof pos == "undefined") ? p : pos;
for (let i=0; i<dwords.length; i++) {
b.writeUInt32LE(dwords[dwords.length-1-i], i*4, 4 );
}
b.fill(0, dwords.length*4);
const s = n.toString(16);
const b = Buffer.from(s.padStart(n8*2, "0"), "hex");
const buff = Buffer.allocUnsafe(b.length);
for (let i=0; i<b.length; i++) buff[i] = b[b.length-1-i];
await fd.write(b, 0, fs, pos);
await fd.write(buff, o);
if (typeof(pos) == "undefined") p += n8;
}