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c to cpp

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This commit is contained in:
Jordi Baylina
2020-08-13 18:56:30 +02:00
parent 7239abcef1
commit 4b631994ca
7 changed files with 207 additions and 145 deletions
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3
cli.js
View File

@@ -87,6 +87,8 @@ async function run() {
if (argv.csource) { if (argv.csource) {
options.cSourceFile = await fastFile.createOverride(cSourceName); options.cSourceFile = await fastFile.createOverride(cSourceName);
const noExt = cSourceName.substr(0, cSourceName.lastIndexOf(".")) || cSourceName;
options.dataFile = await fastFile.createOverride(noExt+".dat");
} }
if (argv.wasm) { if (argv.wasm) {
options.wasmFile = await fastFile.createOverride(wasmName); options.wasmFile = await fastFile.createOverride(wasmName);
@@ -117,6 +119,7 @@ async function run() {
await compiler(fullFileName, options); await compiler(fullFileName, options);
if (options.cSourceFile) await options.cSourceFile.close(); if (options.cSourceFile) await options.cSourceFile.close();
if (options.dataFile) await options.dataFile.close();
if (options.wasmFile) await options.wasmFile.close(); if (options.wasmFile) await options.wasmFile.close();
if (options.watFile) await options.watFile.close(); if (options.watFile) await options.watFile.close();
let symDone = false; let symDone = false;

24
package-lock.json generated
View File

@@ -203,22 +203,12 @@
"integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=" "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII="
}, },
"circom_runtime": { "circom_runtime": {
"version": "0.0.6", "version": "0.1.2",
"resolved": "https://registry.npmjs.org/circom_runtime/-/circom_runtime-0.0.6.tgz", "resolved": "https://registry.npmjs.org/circom_runtime/-/circom_runtime-0.1.2.tgz",
"integrity": "sha512-o0T5MuWzxnxinWG3+CygS/kZouoP+z5ZrufUwqKJy3gsVFJhkbqMpfKmcBGjhExB3uatA7cKyOiRAOLOz5+t5w==", "integrity": "sha512-qh1GsfxXLGAhLBcIQWrFHO/zu6kuXQQL1xC3+P8KRETvynTbBVSb1ul3dCiXyetm7lVNNdhb1/UoOCEZ6yu1RQ==",
"requires": { "requires": {
"ffjavascript": "0.1.0", "ffjavascript": "0.2.4",
"fnv-plus": "^1.3.1" "fnv-plus": "^1.3.1"
},
"dependencies": {
"ffjavascript": {
"version": "0.1.0",
"resolved": "https://registry.npmjs.org/ffjavascript/-/ffjavascript-0.1.0.tgz",
"integrity": "sha512-dmKlUasSfvUcxBm8nCSKl2x7EFJsXA7OVP8XLFA03T2+6mAc3IiVLC2ambEVOcMOhyhl0vJfVZjM9f9d38D1rw==",
"requires": {
"big-integer": "^1.6.48"
}
}
} }
}, },
"cjson": { "cjson": {
@@ -581,9 +571,9 @@
"integrity": "sha512-0EZo2y5eW8X0oiDDRvcnufjVxlM96CQL5hvmRQtbRABWlCkH73IHwkzl0qOSdxtchaMr+0TSB7GVqaVEixRr1Q==" "integrity": "sha512-0EZo2y5eW8X0oiDDRvcnufjVxlM96CQL5hvmRQtbRABWlCkH73IHwkzl0qOSdxtchaMr+0TSB7GVqaVEixRr1Q=="
}, },
"ffiasm": { "ffiasm": {
"version": "0.0.2", "version": "0.1.0",
"resolved": "https://registry.npmjs.org/ffiasm/-/ffiasm-0.0.2.tgz", "resolved": "https://registry.npmjs.org/ffiasm/-/ffiasm-0.1.0.tgz",
"integrity": "sha512-o/CL7F4IodB7eRHCOQL1SrqN2DIPHrQbEwjPY7NIyeBRdnB3G0xo6b6Mj44SKiWFnvpQMb3n4N7acjD3vv4NVQ==", "integrity": "sha512-fQI7b6oye7Yw3t28ku9XuhPSwwzKMeqB0pkIaGPrKl9s/ipV90o8J4Ge0s5F0UsH5Mu2wfr3hFQ2sGF+vQk5Sg==",
"requires": { "requires": {
"big-integer": "^1.6.48", "big-integer": "^1.6.48",
"ejs": "^3.0.1", "ejs": "^3.0.1",

4
package.json
View File

@@ -30,9 +30,9 @@
}, },
"dependencies": { "dependencies": {
"chai": "^4.2.0", "chai": "^4.2.0",
"circom_runtime": "0.0.6", "circom_runtime": "0.1.2",
"fastfile": "0.0.12", "fastfile": "0.0.12",
"ffiasm": "0.0.2", "ffiasm": "0.1.0",
"ffjavascript": "0.2.4", "ffjavascript": "0.2.4",
"ffwasm": "0.0.7", "ffwasm": "0.0.7",
"fnv-plus": "^1.3.1", "fnv-plus": "^1.3.1",

302
ports/c/builder.js
View File

@@ -352,6 +352,13 @@ class BuilderC {
this.components = new BigArray(); this.components = new BigArray();
this.usedConstants = {}; this.usedConstants = {};
this.verbose = verbose; this.verbose = verbose;
this.sizePointers = {};
this.hashMapPointers = {};
this.cetPointers = {};
this.functionIdx = {};
this.nCets = 0;
} }
setHeader(header) { setHeader(header) {
@@ -413,8 +420,8 @@ class BuilderC {
_buildHeader(code) { _buildHeader(code) {
code.push( code.push(
"#include \"circom.h\"", "#include \"circom.hpp\"",
"#include \"calcwit.h\"", "#include \"calcwit.hpp\"",
`#define NSignals ${this.header.NSignals}`, `#define NSignals ${this.header.NSignals}`,
`#define NComponents ${this.header.NComponents}`, `#define NComponents ${this.header.NComponents}`,
`#define NOutputs ${this.header.NOutputs}`, `#define NOutputs ${this.header.NOutputs}`,
@@ -425,70 +432,92 @@ class BuilderC {
); );
} }
_buildHashMaps(code) { async _buildHashMaps(fdData) {
code.push("// Hash Maps "); while (fdData.pos % 8) fdData.pos++;
this.pHashMaps = fdData.pos;
const buff = new Uint8Array(256*12);
const buffV = new DataView(buff.buffer);
for (let hmName in this.hashMaps ) { for (let hmName in this.hashMaps ) {
while (fdData.pos % 8) fdData.pos++;
this.hashMapPointers[hmName] = fdData.pos;
const hm = this.hashMaps[hmName]; const hm = this.hashMaps[hmName];
let c = `Circom_HashEntry ${hmName}[256] = {`;
for (let i=0; i<256; i++) { for (let i=0; i<256; i++) {
c += i>0 ? "," : ""; buffV.setUint32(i*12, hm[i] ? parseInt( hm[i][0].slice(8), 16 ) : 0, true);
if (hm[i]) { buffV.setUint32(i*12+4, hm[i] ? parseInt( hm[i][0].slice(0,8), 16 ) : 0, true);
c += `{0x${hm[i][0]}LL, ${hm[i][1]}} /* ${hm[i][2]} */`; buffV.setUint32(i*12+8, hm[i] ? hm[i][1] : 0, true);
} else {
c += "{0,0}";
}
} }
c += "};";
code.push(c); await fdData.write(buff);
} }
} }
_buildComponentEntriesTables(code) { async _buildComponentEntriesTables(fdData) {
code.push("// Component Entry tables");
while (fdData.pos % 8) fdData.pos++;
this.pCets = fdData.pos;
for (let i=0; i< this.componentEntriesTables.length; i++) { for (let i=0; i< this.componentEntriesTables.length; i++) {
if ((this.verbose)&&(i%100000 ==0)) console.log(`_buildComponentEntriesTables ${i}/${this.componentEntriesTables.length}`); if ((this.verbose)&&(i%100000 ==0)) console.log(`_buildComponentEntriesTables ${i}/${this.componentEntriesTables.length}`);
const cetName = this.componentEntriesTables[i].name; const cetName = this.componentEntriesTables[i].name;
const cet = this.componentEntriesTables[i].cet; const cet = this.componentEntriesTables[i].cet;
code.push(`Circom_ComponentEntry ${cetName}[${cet.length}] = {`); this.cetPointers[cetName] = fdData.pos;
const buff = new Uint8Array(16*cet.length);
const buffV = new DataView(buff.buffer);
for (let j=0; j<cet.length; j++) { for (let j=0; j<cet.length; j++) {
const ty = cet[j].type == "S" ? "_typeSignal" : "_typeComponent"; utils.setUint64(buffV, 16*j+0, this.sizePointers[ cet[j].sizeName]);
code.push(` ${j>0?",":" "}{${cet[j].offset},${cet[j].sizeName}, ${ty}}`); buffV.setUint32(16*j+8, cet[j].offset, true);
buffV.setUint32(16*j+12, cet[j].type == "S" ? 0 : 1, true); // Size type 0-> Signal, 1->Component
this.nCets ++;
} }
code.push("};");
await fdData.write(buff);
} }
} }
_buildSizes(code) { async _buildSizes(fdData) {
code.push("// Sizes");
for (let sName in this.sizes) { for (let sName in this.sizes) {
const accSizes = this.sizes[sName]; const accSizes = this.sizes[sName];
let c = `Circom_Size ${sName}[${accSizes.length}] = {`; while (fdData.pos % 8) fdData.pos++;
this.sizePointers[sName] = fdData.pos;
const buff = new Uint8Array(4*accSizes.length);
const buffV = new DataView(buff.buffer);
for (let i=0; i<accSizes.length; i++) { for (let i=0; i<accSizes.length; i++) {
if (i>0) c += ","; buffV.setUint32(i*4, accSizes[i], true);
c += accSizes[i];
} }
c += "};"; await fdData.write(buff);
code.push(c);
} }
} }
_buildConstants(code) {
async _buildConstants(fdData) {
const self = this; const self = this;
code.push("// Constants"); const frSize = (8 + self.F.n64*8);
code.push(`FrElement _constants[${self.constants.length}] = {`); const buff = new Uint8Array(self.constants.length* frSize);
for (let i=0; i<self.constants.length; i++) { const buffV = new DataView(buff.buffer);
if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildConstants ${i}/${this.constants.length}`);
code.push((i>0 ? "," : " ") + "{" + number2Code(self.constants[i]) + "}");
}
code.push("};");
function number2Code(n) {
while (fdData.pos % 8) fdData.pos++;
this.pConstants = fdData.pos;
let o = 0;
for (let i=0; i<self.constants.length; i++) {
Fr2Bytes(buffV, o, self.constants[i]);
o += frSize;
}
await fdData.write(buff);
function Fr2Bytes(buffV, offset, n) {
const minShort = self.F.neg(self.F.e("80000000")); const minShort = self.F.neg(self.F.e("80000000"));
const maxShort = self.F.e("7FFFFFFF", 16); const maxShort = self.F.e("7FFFFFFF", 16);
@@ -496,51 +525,49 @@ class BuilderC {
&&(self.F.leq(n, maxShort))) &&(self.F.leq(n, maxShort)))
{ {
if (self.F.geq(n, self.F.zero)) { if (self.F.geq(n, self.F.zero)) {
return addShortMontgomeryPositive(n); return shortMontgomeryPositive(n);
} else { } else {
return addShortMontgomeryNegative(n); return shortMontgomeryNegative(n);
} }
} }
return addLongMontgomery(n); return longMontgomery(n);
function addShortMontgomeryPositive(a) { function shortMontgomeryPositive(a) {
return `${a.toString()}, 0x40000000, { ${getLongString(toMontgomery(a))} }`; buffV.setUint32(offset, Scalar.toNumber(a) , true );
buffV.setUint32(offset + 4, 0x40000000 , true );
long(buffV, offset + 8, toMontgomery(a));
} }
function addShortMontgomeryNegative(a) { function shortMontgomeryNegative(a) {
const b = -Scalar.toNumber(self.F.neg(a)); const b = -Scalar.toNumber(self.F.neg(a));
return `${b.toString()}, 0x40000000, { ${getLongString(toMontgomery(a))} }`; buffV.setUint32(offset, b , true );
buffV.setUint32(offset + 4, 0x40000000 , true );
long(buffV, offset + 8, toMontgomery(a));
} }
function addLongMontgomery(a) { function longMontgomery(a) {
return `0, 0xC0000000, { ${getLongString(toMontgomery(a))} }`; buffV.setUint32(offset, 0 , true );
buffV.setUint32(offset + 4, 0xC0000000 , true );
long(buffV, offset + 8, toMontgomery(a));
} }
function getLongString(a) { function long(buffV, offset, a) {
let S = "";
let p = offset;
const arr = Scalar.toArray(a, 0x100000000); const arr = Scalar.toArray(a, 0x100000000);
for (let i=0; i<self.F.n64*2; i+=2) { for (let i=0; i<self.F.n64*2; i++) {
const idx = arr.length-2-i; const idx = arr.length-1-i;
if (i>0) S = S + ",";
if ( idx >=0) { if ( idx >=0) {
let msb = arr[idx].toString(16); buffV.setUint32(p, arr[idx], true);
while (msb.length<8) msb = "0" + msb;
let lsb = arr[idx+1].toString(16);
while (lsb.length<8) lsb = "0" + lsb;
S += "0x" + msb + lsb + "LL";
} else { } else {
S += "0LL"; buffV.setUint32(p, 0, true);
} }
p+= 4;
} }
return S;
} }
function toMontgomery(a) { function toMontgomery(a) {
@@ -548,101 +575,132 @@ class BuilderC {
} }
} }
} }
_buildFunctions(code) { _buildFunctions(code) {
const listedFunctions = [];
for (let i=0; i<this.functions.length; i++) { for (let i=0; i<this.functions.length; i++) {
const cfb = this.functions[i]; const cfb = this.functions[i];
cfb.build(code); cfb.build(code);
if (this.functions[i].type == "COMPONENT") {
this.functionIdx[this.functions[i].name] = listedFunctions.length;
listedFunctions.push(i);
}
} }
code.push("// Function Table");
code.push(`Circom_ComponentFunction _functionTable[${listedFunctions.length}] = {`);
for (let i=0; i<listedFunctions.length; i++) {
const sep = i>0 ? " ," : " ";
code.push(`${sep}${this.functions[listedFunctions[i]].name}`);
}
code.push("};");
} }
_buildComponents(code) {
code.push("// Components"); async _buildComponents(fdData) {
code.push(`Circom_Component _components[${this.components.length}] = {`);
const buff = new Uint8Array(32);
const buffV = new DataView(buff.buffer);
while (fdData.pos % 8) fdData.pos++;
this.pComponents = fdData.pos;
for (let i=0; i<this.components.length; i++) { for (let i=0; i<this.components.length; i++) {
if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildComponents ${i}/${this.components.length}`); if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildComponents ${i}/${this.components.length}`);
const c = this.components[i]; const c = this.components[i];
const sep = i>0 ? " ," : " ";
code.push(`${sep}{${c.hashMapName}, ${c.entryTableName}, ${c.functionName}, ${c.nInSignals}, ${c.newThread}}`); utils.setUint64(buffV, 0, this.hashMapPointers[c.hashMapName], true);
utils.setUint64(buffV, 8, this.cetPointers[c.entryTableName], true);
utils.setUint64(buffV, 16, this.functionIdx[c.functionName], true);
buffV.setUint32(24, c.nInSignals, true);
buffV.setUint32(28, c.newThread ? 1 : 0, true);
await fdData.write(buff);
} }
code.push("};");
} }
_buildMapIsInput(code) { async _buildMapIsInput(fdData) {
code.push("// mapIsInput");
code.push(`u32 _mapIsInput[${this.mapIsInput.length}] = {`); const buff = new Uint8Array(this.mapIsInput.length * 4);
let line = ""; const buffV = new DataView(buff.buffer);
while (fdData.pos % 8) fdData.pos++;
this.pMapIsInput = fdData.pos;
for (let i=0; i<this.mapIsInput.length; i++) { for (let i=0; i<this.mapIsInput.length; i++) {
if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildMapIsInput ${i}/${this.mapIsInput.length}`); if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildMapIsInput ${i}/${this.mapIsInput.length}`);
line += i>0 ? ", " : " ";
line += toHex(this.mapIsInput[i]);
if (((i+1) % 64)==0) {
code.push(" "+line);
line = "";
}
}
if (line != "") code.push(" "+line);
code.push("};");
function toHex(number) { buffV.setUint32(4*i, this.mapIsInput[i], true);
if (number < 0) number = 0xFFFFFFFF + number + 1;
let S=number.toString(16).toUpperCase();
while (S.length<8) S = "0" + S;
return "0x"+S;
} }
await fdData.write(buff);
} }
_buildWit2Sig(code) { async _buildWit2Sig(fdData) {
code.push("// Witness to Signal Table");
code.push(`int _wit2sig[${this.wit2sig.length}] = {`); const buff = new Uint8Array(this.wit2sig.length * 4);
let line = ""; const buffV = new DataView(buff.buffer);
while (fdData.pos % 8) fdData.pos++;
this.pWit2Sig = fdData.pos;
for (let i=0; i<this.wit2sig.length; i++) { for (let i=0; i<this.wit2sig.length; i++) {
if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildWit2Sig ${i}/${this.wit2sig.length}`); if ((this.verbose)&&(i%1000000 ==0)) console.log(`_buildWit2Sig ${i}/${this.wit2sig.length}`);
line += i>0 ? "," : " ";
line += this.wit2sig[i]; buffV.setUint32(4*i, this.wit2sig[i], true);
if (((i+1) % 64) == 0) {
code.push(" "+line);
line = "";
}
} }
if (line != "") code.push(" "+line);
code.push("};"); await fdData.write(buff);
} }
_buildCircuitVar(code) { async _buildCircuitVar(fdData) {
code.push( const pP = fdData.pos;
"// Circuit Variable",
"Circom_Circuit _circuit = {" , const strBuff = new TextEncoder("utf-8").encode(this.header.P.toString());
" NSignals,", await fdData.write(strBuff);
" NComponents,",
" NInputs,", const buff = new Uint8Array(72);
" NOutputs,", const buffV = new DataView(buff.buffer);
" NVars,",
" _wit2sig,", utils.setUint64(buffV, 0, this.pWit2Sig, true);
" _components,", utils.setUint64(buffV, 8, this.pComponents, true);
" _mapIsInput,", utils.setUint64(buffV, 16, this.pMapIsInput, true);
" _constants,", utils.setUint64(buffV, 24, this.pConstants, true);
" __P__", utils.setUint64(buffV, 32, pP, true);
"};" utils.setUint64(buffV, 40, this.pCets, true);
);
buffV.setUint32(48, this.header.NSignals, true);
buffV.setUint32(52, this.header.NComponents, true);
buffV.setUint32(56, this.header.NOutputs, true);
buffV.setUint32(60, this.header.NInputs, true);
buffV.setUint32(64, this.header.NVars, true);
buffV.setUint32(68, this.nCets, true);
fdData.pos = 0;
await fdData.write(buff);
} }
async build(fd) { async build(fdCode, fdData) {
const encoder = new TextEncoder("utf-8"); const encoder = new TextEncoder("utf-8");
fdData.pos = 72;
while (fdData.pos % 8) fdData.pos++;
const code=new BigArray(); const code=new BigArray();
this._buildHeader(code); this._buildHeader(code);
this._buildSizes(code); await this._buildSizes(fdData);
this._buildConstants(code); await this._buildConstants(fdData);
this._buildHashMaps(code); await this._buildHashMaps(fdData);
this._buildComponentEntriesTables(code); await this._buildComponentEntriesTables(fdData);
this._buildFunctions(code); this._buildFunctions(code);
this._buildComponents(code); await this._buildComponents(fdData);
this._buildMapIsInput(code); await this._buildMapIsInput(fdData);
this._buildWit2Sig(code); await this._buildWit2Sig(fdData);
this._buildCircuitVar(code); await this._buildCircuitVar(fdData);
await writeCode(code); await writeCode(code);
async function writeCode(c) { async function writeCode(c) {
@@ -651,7 +709,7 @@ class BuilderC {
await writeCode(c[i]); await writeCode(c[i]);
} }
} else if (typeof c === "string") { } else if (typeof c === "string") {
await fd.write(encoder.encode(c + "\n")); await fdCode.write(encoder.encode(c + "\n"));
} }
} }
} }

8
ports/c/tester.js
View File

@@ -31,6 +31,7 @@ async function c_tester(circomFile, _options) {
const options = Object.assign({}, _options); const options = Object.assign({}, _options);
options.cSourceFile = await fastFile.createOverride(path.join(dir.path, baseName + ".cpp")); options.cSourceFile = await fastFile.createOverride(path.join(dir.path, baseName + ".cpp"));
options.dataFile = await fastFile.createOverride(path.join(dir.path, baseName + ".dat"));
options.symWriteStream = fs.createWriteStream(path.join(dir.path, baseName + ".sym")); options.symWriteStream = fs.createWriteStream(path.join(dir.path, baseName + ".sym"));
options.r1csFileName = path.join(dir.path, baseName + ".r1cs"); options.r1csFileName = path.join(dir.path, baseName + ".r1cs");
@@ -38,14 +39,15 @@ async function c_tester(circomFile, _options) {
await compiler(circomFile, options); await compiler(circomFile, options);
await options.cSourceFile.close(); await options.cSourceFile.close();
await options.dataFile.close();
const source = await buildZqField(options.p, "Fr"); const source = await buildZqField(options.p, "Fr");
// console.log(dir.path); // console.log(dir.path);
await fs.promises.writeFile(path.join(dir.path, "fr.asm"), source.asm, "utf8"); await fs.promises.writeFile(path.join(dir.path, "fr.asm"), source.asm, "utf8");
await fs.promises.writeFile(path.join(dir.path, "fr.h"), source.h, "utf8"); await fs.promises.writeFile(path.join(dir.path, "fr.hpp"), source.hpp, "utf8");
await fs.promises.writeFile(path.join(dir.path, "fr.c"), source.c, "utf8"); await fs.promises.writeFile(path.join(dir.path, "fr.cpp"), source.cpp, "utf8");
let pThread = ""; let pThread = "";
@@ -66,7 +68,7 @@ async function c_tester(circomFile, _options) {
` ${path.join(cdir, "main.cpp")}` + ` ${path.join(cdir, "main.cpp")}` +
` ${path.join(cdir, "calcwit.cpp")}` + ` ${path.join(cdir, "calcwit.cpp")}` +
` ${path.join(cdir, "utils.cpp")}` + ` ${path.join(cdir, "utils.cpp")}` +
` ${path.join(dir.path, "fr.c")}` + ` ${path.join(dir.path, "fr.cpp")}` +
` ${path.join(dir.path, "fr.o")}` + ` ${path.join(dir.path, "fr.o")}` +
` ${path.join(dir.path, baseName + ".cpp")} ` + ` ${path.join(dir.path, baseName + ".cpp")} ` +
` -o ${path.join(dir.path, baseName)}` + ` -o ${path.join(dir.path, baseName)}` +

2
src/compiler.js
View File

@@ -134,7 +134,7 @@ async function compile(srcFile, options) {
measures.generateC = -performance.now(); measures.generateC = -performance.now();
ctx.builder = new BuilderC(options.prime, ctx.verbose); ctx.builder = new BuilderC(options.prime, ctx.verbose);
build(ctx); build(ctx);
await ctx.builder.build(options.cSourceFile); await ctx.builder.build(options.cSourceFile, options.dataFile);
measures.generateC += performance.now(); measures.generateC += performance.now();
} }

9
src/utils.js
View File

@@ -10,6 +10,7 @@ module.exports.fnvHash = fnvHash;
module.exports.sameSizes = sameSizes; module.exports.sameSizes = sameSizes;
module.exports.isDefined = isDefined; module.exports.isDefined = isDefined;
module.exports.accSizes2Str = accSizes2Str; module.exports.accSizes2Str = accSizes2Str;
module.exports.setUint64 = setUint64;
function ident(text) { function ident(text) {
if (typeof text === "string") { if (typeof text === "string") {
@@ -90,6 +91,14 @@ function accSizes2Str(sizes) {
return `[${sizes[0]/sizes[1]}]`+accSizes2Str(sizes.slice(1)); return `[${sizes[0]/sizes[1]}]`+accSizes2Str(sizes.slice(1));
} }
function setUint64(buffV, o, n) {
const sLSB = n >>> 0;
const sMSB = (n - sLSB) / 0x100000000;
buffV.setUint32(o, sLSB , true);
buffV.setUint32(o+4, sMSB , true);
}