Module: NBTFile::WriteMethods

Includes:
CommonMethods, Tokens
Included in:
CompoundWriterState, ListWriterState, TopWriterState
Defined in:
lib/nbtfile.rb

Instance Method Summary collapse

Methods included from CommonMethods

#sign_bit

Instance Method Details

#emit_byte(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 303

def emit_byte(io, value)
  emit_integer(io, 1, value)
end

#emit_byte_array(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 327

def emit_byte_array(io, value)
  value = value.dup
  value._nbtfile_force_encoding("BINARY")
  emit_int(io, value._nbtfile_bytesize)
  io.write(value)
end

#emit_double(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 323

def emit_double(io, value)
  io.write([value].pack("G"))
end

#emit_float(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 319

def emit_float(io, value)
  io.write([value].pack("g"))
end

#emit_int(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 311

def emit_int(io, value)
  emit_integer(io, 4, value)
end

#emit_integer(io, n_bytes, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 295

def emit_integer(io, n_bytes, value)
  value -= ((value & sign_bit(n_bytes)) << 1)
  bytes = (1..n_bytes).map do |n|
    byte = (value >> ((n_bytes - n) << 3) & 0xff)
  end
  io.write(bytes.pack("C*"))
end

#emit_list_header(io, type, count) ⇒ Object 



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# File 'lib/nbtfile.rb', line 347

def emit_list_header(io, type, count)
  emit_type(io, type)
  emit_int(io, count)
end

#emit_long(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 315

def emit_long(io, value)
  emit_integer(io, 8, value)
end

#emit_short(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 307

def emit_short(io, value)
  emit_integer(io, 2, value)
end

#emit_string(io, value) ⇒ Object 



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# File 'lib/nbtfile.rb', line 334

def emit_string(io, value)
  value = value._nbtfile_encode("UTF-8")
  unless value._nbtfile_valid_encoding?
    raise EncodingError, "Invalid character sequence"
  end
  emit_short(io, value._nbtfile_bytesize)
  io.write(value)
end

#emit_type(io, type) ⇒ Object 



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# File 'lib/nbtfile.rb', line 343

def emit_type(io, type)
  emit_byte(io, TOKEN_INDICES_BY_CLASS[type])
end

#emit_value(io, type, value, capturing, state, cont) ⇒ Object 



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# File 'lib/nbtfile.rb', line 352

def emit_value(io, type, value, capturing, state, cont)
  next_state = state

  case
  when type == TAG_Byte
    emit_byte(io, value)
  when type == TAG_Short
    emit_short(io, value)
  when type == TAG_Int
    emit_int(io, value)
  when type == TAG_Long
    emit_long(io, value)
  when type == TAG_Float
    emit_float(io, value)
  when type == TAG_Double
    emit_double(io, value)
  when type == TAG_Byte_Array
    emit_byte_array(io, value)
  when type == TAG_String
    emit_string(io, value)
  when type == TAG_Float
    emit_float(io, value)
  when type == TAG_Double
    emit_double(io, value)
  when type == TAG_List
    next_state = ListWriterState.new(state, value, capturing)
  when type == TAG_Compound
    next_state = CompoundWriterState.new(state, capturing)
  when type == TAG_End
    next_state = cont
  else
    raise RuntimeError, "Unexpected token #{type}"
  end

  next_state
end