encodeSfixed64Field function

List<int> encodeSfixed64Field(
  1. List<int> buffer,
  2. int fieldNumber,
  3. int value
)

Encodes an sfixed64 field (wire type 1) into buffer.

Proto3 rule: if value is 0, nothing is written. The signed 64-bit value is serialized identically to fixed64 on the wire — the sign is preserved in the two's-complement bit pattern and the 8-byte little-endian encoding is the same.

Returns the same buffer list, possibly with bytes appended.

Implementation

List<int> encodeSfixed64Field(List<int> buffer, int fieldNumber, int value) {
  if (value == 0) return buffer;
  encodeTag(buffer, fieldNumber, 1);
  encodeFixed64(buffer, value);
  return buffer;
}