skipField function

int skipField(List<int> bytes, int offset, int wireType)

Skip an unknown field (field number not in descriptor).

Returns the number of bytes consumed (not counting the tag, which the caller has already read).

Wire type mapping:

• 0 (VARINT): read and discard a varint
• 1 (I64): skip 8 bytes
• 2 (LEN): read length varint, skip that many bytes
• 5 (I32): skip 4 bytes

Throws FormatException for unsupported wire types (3, 4 are deprecated group start/end).

Implementation

int skipField(List<int> bytes, int offset, int wireType) {
  switch (wireType) {
    case 0:
      // VARINT: read until continuation bit is clear.
      final result = decodeVarint(bytes, offset);
      return result['bytesRead']!;
    case 1:
      // I64: always 8 bytes.
      return 8;
    case 2:
      // LEN: varint length prefix + that many bytes.
      final result = decodeVarint(bytes, offset);
      final length = result['value']!;
      final varintSize = result['bytesRead']!;
      return varintSize + length;
    case 5:
      // I32: always 4 bytes.
      return 4;
    default:
      throw FormatException(
        'Unknown or unsupported wire type $wireType at offset $offset',
      );
  }
}