encodeSint32Field function

List<int> encodeSint32Field(
  1. List<int> buffer,
  2. int fieldNumber,
  3. int value
)

Encodes a sint32 field: tag(fieldNumber, VARINT) + varint(zigzag32(value)).

ZigZag encoding maps signed values to unsigned so that small absolute values produce small varints (efficient for fields that are often negative).

Returns buffer unchanged if value is 0 (proto3 default).

Implementation

List<int> encodeSint32Field(List<int> buffer, int fieldNumber, int value) {
  if (value == 0) return buffer;
  encodeTag(buffer, fieldNumber, _wireTypeVarint);
  encodeVarint(buffer, encodeZigZag32(value));
  return buffer;
}