/*
 *
 * Copyright 2017, 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,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

import Foundation

// The I/O code below is derived from Apple's swift-protobuf project.
// https://github.com/apple/swift-protobuf
// BEGIN swift-protobuf derivation

#if os(Linux)
  import Glibc
#else
  import Darwin.C
#endif

enum PluginError: Error {
  /// Raised for any errors reading the input
  case readFailure
}

// Alias clib's write() so Stdout.write(bytes:) can call it.
private let _write = write

class Stdin {
  static func readall() throws -> Data {
    let fd: Int32 = 0
    let buffSize = 32
    var buff = [UInt8]()
    while true {
      var fragment = [UInt8](repeating: 0, count: buffSize)
      let count = read(fd, &fragment, buffSize)
      if count < 0 {
        throw PluginError.readFailure
      }
      if count < buffSize {
        buff += fragment[0..<count]
        return Data(bytes: buff)
      }
      buff += fragment
    }
  }
}

class Stdout {
  static func write(bytes: Data) {
    bytes.withUnsafeBytes { (p: UnsafePointer<UInt8>) -> () in
      _ = _write(1, p, bytes.count)
    }
  }
}

// END swift-protobuf derivation