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File: /var/www/linde-ai/html/node_modules/spdy-transport/lib/spdy-transport/protocol/base/utils.js
'use strict'

var utils = exports

var util = require('util')

function ProtocolError (code, message) {
  this.code = code
  this.message = message
}
util.inherits(ProtocolError, Error)
utils.ProtocolError = ProtocolError

utils.error = function error (code, message) {
  return new ProtocolError(code, message)
}

utils.reverse = function reverse (object) {
  var result = []

  Object.keys(object).forEach(function (key) {
    result[object[key] | 0] = key
  })

  return result
}

// weight [1, 36] <=> priority [0, 7]
// This way weight=16 is preserved and has priority=3
utils.weightToPriority = function weightToPriority (weight) {
  return ((Math.min(35, (weight - 1)) / 35) * 7) | 0
}

utils.priorityToWeight = function priorityToWeight (priority) {
  return (((priority / 7) * 35) | 0) + 1
}

// Copy-Paste from node
exports.addHeaderLine = function addHeaderLine (field, value, dest) {
  field = field.toLowerCase()
  if (/^:/.test(field)) {
    dest[field] = value
    return
  }

  switch (field) {
    // Array headers:
    case 'set-cookie':
      if (dest[field] !== undefined) {
        dest[field].push(value)
      } else {
        dest[field] = [ value ]
      }
      break

    /* eslint-disable max-len */
    // list is taken from:
    /* eslint-enable max-len */
    case 'content-type':
    case 'content-length':
    case 'user-agent':
    case 'referer':
    case 'host':
    case 'authorization':
    case 'proxy-authorization':
    case 'if-modified-since':
    case 'if-unmodified-since':
    case 'from':
    case 'location':
    case 'max-forwards':
      // drop duplicates
      if (dest[field] === undefined) {
        dest[field] = value
      }
      break

    case 'cookie':
      // make semicolon-separated list
      if (dest[field] !== undefined) {
        dest[field] += '; ' + value
      } else {
        dest[field] = value
      }
      break

    default:
      // make comma-separated list
      if (dest[field] !== undefined) {
        dest[field] += ', ' + value
      } else {
        dest[field] = value
      }
  }
}