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Inconsistent result when writing negative float into int32 #2098

Open
@MonteePoke

Description

Minimal code to reproduce:

import {Field, Message} from 'protobufjs';
export class DataPacketCacheDto extends Message<DataPacketCacheDto> {
 @Field.d(1, 'float')
 f: number;
 @Field.d(2, 'int32')
 f2: number;
 @Field.d(3, 'int32')
 f3: number;
}
const message = new DataPacketCacheDto({
 f: 1097.300048828125,
 f2: 1.793662034335766e-43,
 f3: -2.0975153105823492e-14,
});
const buffer = Buffer.from(DataPacketCacheDto.encode(message).finish());
console.log(buffer.toString('hex'));
const decodedPacket: DataPacketCacheDto = (DataPacketCacheDto.toObject(DataPacketCacheDto.decode(buffer as Buffer), {
 defaults: true,
}) as DataPacketCacheDto);
console.log(decodedPacket);

Expected result:
Error: invalid wire type

Actual result
Every run outputs a different result:

  1. Trying to encode results in error:
 throw Error("invalid wire type " + wireType + " at offset " + this.pos);
 ^
Error: invalid wire type 4 at offset 11
  1. Some runs manage to encode message into a buffer, but the buffer can't be decoded:
0d9a298944100018008ab8346c0100008891
E:\Projects\protobuf_test\node_modules\protobufjs\src\reader.js:13
 return RangeError("index out of range: " + reader.pos + " + " + (writeLength || 1) + " > " + reader.len)
;
 ^
RangeError: index out of range: 13 + 108 > 18
  1. Other times decoding the buffer succeeds but, field values aren't the same as before encodingOutput:
0d9a2989441000180000000034090000c8c0
{ f: -6.25, f2: 0, f3: 0 }

Observations:

  • positive float are rounded;
  • buffer is simingly random;
  • indexes in error messages are random;

package.json

{
 "dependencies": {
 "protobufjs": "7.5.4"
 },
 "devDependencies": {
 "ts-node": "9.1.1",
 "typescript": "4.2.3"
 }
}

tsconfig.json

{
 "compilerOptions": {
 "module": "commonjs",
 "declaration": true,
 "removeComments": true,
 "emitDecoratorMetadata": true,
 "experimentalDecorators": true,
 "allowSyntheticDefaultImports": true,
 "target": "es2017",
 "sourceMap": true,
 "outDir": "./dist",
 "baseUrl": "./",
 "incremental": true,
 "paths": {}
 },
 "exclude": ["node_modules", "dist"]
}

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