feat: ported protobuf decoder

lib/protobuf-decoder/intUtils.js

@@ -1,27 +0,0 @@
-import JSBI from "jsbi";
-
-export function interpretAsSignedType(n) {
-  // see https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wire_format_lite.h#L857-L876
-  // however, this is a simpler equivalent formula
-  const isEven = JSBI.equal(JSBI.bitwiseAnd(n, JSBI.BigInt(1)), JSBI.BigInt(0));
-  if (isEven) {
-    return JSBI.divide(n, JSBI.BigInt(2));
-  } else {
-    return JSBI.multiply(
-      JSBI.BigInt(-1),
-      JSBI.divide(JSBI.add(n, JSBI.BigInt(1)), JSBI.BigInt(2))
-    );
-  }
-}
-
-export function interpretAsTwosComplement(n, bits) {
-  const isTwosComplement = JSBI.equal(
-    JSBI.signedRightShift(n, JSBI.BigInt(bits - 1)),
-    JSBI.BigInt(1)
-  );
-  if (isTwosComplement) {
-    return JSBI.subtract(n, JSBI.leftShift(JSBI.BigInt(1), JSBI.BigInt(bits)));
-  } else {
-    return n;
-  }
-}

lib/protobuf-decoder/protobufDecoder.js

@@ -72,7 +72,6 @@ export const TYPES = {
 export function decodeProto(buffer) {
   const reader = new BufferReader(buffer);
   const parts = [];
-
   reader.trySkipGrpcHeader();
 
   try {
@@ -108,6 +107,7 @@ export function decodeProto(buffer) {
     }
   } catch (err) {
     reader.resetToCheckpoint();
+    console.log(err);
   }
 
   return {

lib/protobuf-decoder/varintUtils.js

@@ -1,6 +1,5 @@
-"use bigint"
 export function decodeVarint(buffer, offset) {
-  let res = BigInt(0);
+  let res = this.BigInt(0);
   let shift = 0;
   let byte = 0;
 
@@ -10,11 +9,12 @@ export function decodeVarint(buffer, offset) {
     }
 
     byte = buffer[offset++];
+    console.log(this)
 
-    const multiplier = exponentiate(BigInt(2), BigInt(shift));
-    const thisByteValue = multiply(BigInt(byte & 0x7f), multiplier);
+    const multiplier = this.BigInt(2) ** this.BigInt(shift);
+    const thisByteValue = this.BigInt(byte & 0x7f) * multiplier;
     shift += 7;
-    res = add(res, thisByteValue);
+    res = res + thisByteValue;
   } while (byte >= 0x80);
 
   return {