read(reader, message, options, length) {
        this.prepare();
        const end = length === undefined ? reader.len : reader.pos + length;
        while (reader.pos < end) {
            // read the tag and find the field
            const [fieldNo, wireType] = reader.tag(), field = this.fieldNoToField.get(fieldNo);
            if (!field) {
                let u = options.readUnknownField;
                if (u == "throw")
                    throw new Error(`Unknown field ${fieldNo} (wire type ${wireType}) for ${this.info.typeName}`);
                let d = reader.skip(wireType);
                if (u !== false)
                    (u === true ? binary_format_contract_1.UnknownFieldHandler.onRead : u)(this.info.typeName, message, fieldNo, wireType, d);
                continue;
            }
            // target object for the field we are reading
            let target = message, repeated = field.repeat, localName = field.localName;
            // if field is member of oneof ADT, use ADT as target
            if (field.oneof) {
                target = target[field.oneof];
                // if other oneof member selected, set new ADT
                if (target.oneofKind !== localName)
                    target = message[field.oneof] = {
                        oneofKind: localName
                    };
            }
            // we have handled oneof above, we just have read the value into `target[localName]`
            switch (field.kind) {
                case "scalar":
                case "enum":
                    let T = field.kind == "enum" ? reflection_info_1.ScalarType.INT32 : field.T;
                    let L = field.kind == "scalar" ? field.L : undefined;
                    if (repeated) {
                        let arr = target[localName]; // safe to assume presence of array, oneof cannot contain repeated values
                        if (wireType == binary_format_contract_1.WireType.LengthDelimited && T != reflection_info_1.ScalarType.STRING && T != reflection_info_1.ScalarType.BYTES) {
                            let e = reader.uint32() + reader.pos;
                            while (reader.pos < e)
                                arr.push(this.scalar(reader, T, L));
                        }
                        else
                            arr.push(this.scalar(reader, T, L));
                    }
                    else
                        target[localName] = this.scalar(reader, T, L);
                    break;
                case "message":
                    if (repeated) {
                        let arr = target[localName]; // safe to assume presence of array, oneof cannot contain repeated values
                        let msg = field.T().internalBinaryRead(reader, reader.uint32(), options);
                        arr.push(msg);
                    }
                    else
                        target[localName] = field.T().internalBinaryRead(reader, reader.uint32(), options, target[localName]);
                    break;
                case "map":
                    let [mapKey, mapVal] = this.mapEntry(field, reader, options);
                    // safe to assume presence of map object, oneof cannot contain repeated values
                    target[localName][mapKey] = mapVal;
                    break;
            }
        }
    }
Reads a message from binary format into the target message.

Repeated fields are appended. Map entries are added, overwriting
existing keys.

If a message field is already present, it will be merged with the
new data.