grpc-swift/Sources/QuickProto/NSMutableData+Proto.swift

/*
 *
 * Copyright 2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 */
import Foundation

// Extensions that support serialization of protocol buffers
extension NSMutableData {

  func appendVarint(_ value: Int) {
    var x = value
    while x > 128 {
      var remainder : UInt8 = UInt8(x & 0x7F)
      remainder = remainder | 0x80
      append(&remainder, length: 1)
      x = x >> 7
    }
    var final = UInt8(x)
    append(&final, length: 1)
  }

  func appendDouble(_ value: Double) {
    var x = value
    append(&x, length: 8)
  }

  func appendFloat(_ value: Float) {
    var x = value
    append(&x, length: 4)
  }

  func appendInt32(_ value: Int) {
    var x : Int32 = Int32(value)
    append(&x, length: 4)
  }

  func appendInt64(_ value: Int) {
    var x : Int64 = Int64(value)
    append(&x, length: 8)
  }
}