fix check circom version

c/tester.js

@@ -11,8 +11,6 @@ const exec = util.promisify(require("child_process").exec);
 const loadR1cs = require("r1csfile").load;
 const ZqField = require("ffjavascript").ZqField;
 
-const readWtns = require("snarkjs").wtns.exportJson;
-
 module.exports = c_tester;
 
 async function  c_tester(circomInput, _options) {
@@ -83,7 +81,7 @@ class WasmTester {
 	});
 	await exec("ls " + path.join(this.dir.path, this.baseName+"_cpp/"));
 	await exec(runc + " " + inputFile + " " + wtnsFile);
-	return await readBinWitnessFile(wtnsFile);
+	return readBinaryFile(wtnsFile);
     }
 
     async loadSymbols() {
@@ -204,15 +202,24 @@ function check_versions ( v1, v2 ) {
 }
 
 async function compiler_above_version(v) {
-    let output = await exec('circom --version').toString();
+    let output = (await exec('circom --version')).stdout;
     let compiler_version = version_to_list(output.slice(output.search(/\d/),-1));
     vlist = version_to_list(v);
     return check_versions ( compiler_version, vlist );
 }
 
-async function readBinWitnessFile(fileName) {
-    const buffWitness = await readWtns(fileName);
-    return buffWitness;
+function readBinaryFile(fileName) {
+    const buff = fs.readFileSync(fileName);
+    const n32 = fromArray8ToUint(buff.slice(24,27));
+    var pos = 28+n32;
+    const ws = fromArray8ToUint(buff.slice(pos,pos+3));
+    pos += 16;
+    const w = [];
+    for (let i=0; i<ws; i++) {
+	w.push(fromArray8(buff.slice(pos,pos+n32-1)));
+	pos += n32;
+    }
+    return w;
 }
 
 function fromArray8(arr) { //returns a BigInt

package.json

@@ -29,7 +29,6 @@
     "fnv-plus": "^1.3.1",
     "r1csfile": "0.0.16",
     "tmp-promise": "^3.0.2",
-    "util": "^0.12.4",
-    "snarkjs": "0.4.10"
+    "util": "^0.12.4"
   }
 }

wasm/tester.js

@@ -193,7 +193,7 @@ function check_versions ( v1, v2 ) {
 }
 
 async function compiler_above_version(v) {
-    let output = await exec('circom --version').toString();
+    let output = (await exec('circom --version')).stdout;
     let compiler_version = version_to_list(output.slice(output.search(/\d/),-1));
     vlist = version_to_list(v);
     return check_versions ( compiler_version, vlist );