js/binary/constants.js

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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/**
 * @fileoverview This file contains constants and typedefs used by
 * jspb.BinaryReader and BinaryWriter.
 *
 * @author aappleby@google.com (Austin Appleby)
 */

goog.provide('jspb.AnyFieldType');
goog.provide('jspb.BinaryConstants');
goog.provide('jspb.BinaryMessage');
goog.provide('jspb.BuilderFunction');
goog.provide('jspb.ByteSource');
goog.provide('jspb.ClonerFunction');
goog.provide('jspb.ConstBinaryMessage');
goog.provide('jspb.ReaderFunction');
goog.provide('jspb.RecyclerFunction');
goog.provide('jspb.WriterFunction');

goog.forwardDeclare('jspb.Message');
goog.forwardDeclare('jsproto.BinaryExtension');



/**
 * Base interface class for all const messages. Does __not__ define any
 * methods, as doing so on a widely-used interface defeats dead-code
 * elimination.
 * @interface
 */
jspb.ConstBinaryMessage = function() {};



/**
 * Base interface class for all messages. Does __not__ define any methods, as
 * doing so on a widely-used interface defeats dead-code elimination.
 * @interface
 * @extends {jspb.ConstBinaryMessage}
 */
jspb.BinaryMessage = function() {};


/**
 * The types convertible to Uint8Arrays. Strings are assumed to be
 * base64-encoded.
 * @typedef {ArrayBuffer|Uint8Array|Array<number>|string}
 */
jspb.ByteSource;


/**
 * A field in jspb can be a scalar, a block of bytes, another proto, or an
 * array of any of the above.
 * @typedef {boolean|number|string|Uint8Array|
             jspb.BinaryMessage|jsproto.BinaryExtension|
             Array<jspb.AnyFieldType>}
 */
jspb.AnyFieldType;


/**
 * A builder function creates an instance of a message object.
 * @typedef {function():!jspb.BinaryMessage}
 */
jspb.BuilderFunction;


/**
 * A cloner function creates a deep copy of a message object.
 * @typedef {function(jspb.ConstBinaryMessage):jspb.BinaryMessage}
 */
jspb.ClonerFunction;


/**
 * A recycler function destroys an instance of a message object.
 * @typedef {function(!jspb.BinaryMessage):void}
 */
jspb.RecyclerFunction;


/**
 * A reader function initializes a message using data from a BinaryReader.
 * @typedef {function(!jspb.BinaryMessage, !jspb.BinaryReader):void}
 */
jspb.ReaderFunction;


/**
 * A writer function serializes a message to a BinaryWriter.
 * @typedef {!function(!jspb.Message, !jspb.BinaryWriter):void |
 *           !function(!jspb.ConstBinaryMessage, !jspb.BinaryWriter):void}
 */
jspb.WriterFunction;


/**
 * Field type codes, taken from proto2/public/wire_format_lite.h.
 * @enum {number}
 */
jspb.BinaryConstants.FieldType = {
  INVALID: -1,
  DOUBLE: 1,
  FLOAT: 2,
  INT64: 3,
  UINT64: 4,
  INT32: 5,
  FIXED64: 6,
  FIXED32: 7,
  BOOL: 8,
  STRING: 9,
  GROUP: 10,
  MESSAGE: 11,
  BYTES: 12,
  UINT32: 13,
  ENUM: 14,
  SFIXED32: 15,
  SFIXED64: 16,
  SINT32: 17,
  SINT64: 18,

  // Extended types for Javascript

  FHASH64: 30, // 64-bit hash string, fixed-length encoding.
  VHASH64: 31  // 64-bit hash string, varint encoding.
};


/**
 * Wire-format type codes, taken from proto2/public/wire_format_lite.h.
 * @enum {number}
 */
jspb.BinaryConstants.WireType = {
  INVALID: -1,
  VARINT: 0,
  FIXED64: 1,
  DELIMITED: 2,
  START_GROUP: 3,
  END_GROUP: 4,
  FIXED32: 5
};


/**
 * Translates field type to wire type.
 * @param {jspb.BinaryConstants.FieldType} fieldType
 * @return {jspb.BinaryConstants.WireType}
 */
jspb.BinaryConstants.FieldTypeToWireType = function(fieldType) {
  var fieldTypes = jspb.BinaryConstants.FieldType;
  var wireTypes = jspb.BinaryConstants.WireType;
  switch (fieldType) {
    case fieldTypes.INT32:
    case fieldTypes.INT64:
    case fieldTypes.UINT32:
    case fieldTypes.UINT64:
    case fieldTypes.SINT32:
    case fieldTypes.SINT64:
    case fieldTypes.BOOL:
    case fieldTypes.ENUM:
    case fieldTypes.VHASH64:
      return wireTypes.VARINT;

    case fieldTypes.DOUBLE:
    case fieldTypes.FIXED64:
    case fieldTypes.SFIXED64:
    case fieldTypes.FHASH64:
      return wireTypes.FIXED64;

    case fieldTypes.STRING:
    case fieldTypes.MESSAGE:
    case fieldTypes.BYTES:
      return wireTypes.DELIMITED;

    case fieldTypes.FLOAT:
    case fieldTypes.FIXED32:
    case fieldTypes.SFIXED32:
      return wireTypes.FIXED32;

    case fieldTypes.INVALID:
    case fieldTypes.GROUP:
    default:
      return wireTypes.INVALID;
  }
};


/**
 * Flag to indicate a missing field.
 * @const {number}
 */
jspb.BinaryConstants.INVALID_FIELD_NUMBER = -1;


/**
 * The smallest denormal float32 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT32_EPS = 1.401298464324817e-45;


/**
 * The smallest normal float64 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT32_MIN = 1.1754943508222875e-38;


/**
 * The largest finite float32 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT32_MAX = 3.4028234663852886e+38;


/**
 * The smallest denormal float64 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT64_EPS = 5e-324;


/**
 * The smallest normal float64 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT64_MIN = 2.2250738585072014e-308;


/**
 * The largest finite float64 value.
 * @const {number}
 */
jspb.BinaryConstants.FLOAT64_MAX = 1.7976931348623157e+308;


/**
 * Convenience constant equal to 2^20.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_20 = 1048576;


/**
 * Convenience constant equal to 2^23.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_23 = 8388608;


/**
 * Convenience constant equal to 2^31.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_31 = 2147483648;


/**
 * Convenience constant equal to 2^32.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_32 = 4294967296;


/**
 * Convenience constant equal to 2^52.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_52 = 4503599627370496;


/**
 * Convenience constant equal to 2^63.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_63 = 9223372036854775808;


/**
 * Convenience constant equal to 2^64.
 * @const {number}
 */
jspb.BinaryConstants.TWO_TO_64 = 18446744073709551616;


/**
 * Eight-character string of zeros, used as the default 64-bit hash value.
 * @const {string}
 */
jspb.BinaryConstants.ZERO_HASH = '\0\0\0\0\0\0\0\0';