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pack.js
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import { Unpackr, mult10, C1Type, typedArrays, addExtension as unpackAddExtension } from './unpack.js'
let textEncoder
try {
textEncoder = new TextEncoder()
} catch (error) {}
let extensions, extensionClasses
const hasNodeBuffer = typeof Buffer !== 'undefined'
const ByteArrayAllocate = hasNodeBuffer ?
function(length) { return Buffer.allocUnsafeSlow(length) } : Uint8Array
const ByteArray = hasNodeBuffer ? Buffer : Uint8Array
const MAX_BUFFER_SIZE = hasNodeBuffer ? 0x100000000 : 0x7fd00000
let target, keysTarget
let targetView
let position = 0
let safeEnd
let bundledStrings = null
let writeStructSlots
const MAX_BUNDLE_SIZE = 0x5500 // maximum characters such that the encoded bytes fits in 16 bits.
const hasNonLatin = /[\u0080-\uFFFF]/
export const RECORD_SYMBOL = Symbol('record-id')
export class Packr extends Unpackr {
constructor(options) {
super(options)
this.offset = 0
let typeBuffer
let start
let hasSharedUpdate
let structures
let referenceMap
let encodeUtf8 = ByteArray.prototype.utf8Write ? function(string, position) {
return target.utf8Write(string, position, target.byteLength - position)
} : (textEncoder && textEncoder.encodeInto) ?
function(string, position) {
return textEncoder.encodeInto(string, target.subarray(position)).written
} : false
let packr = this
if (!options)
options = {}
let isSequential = options && options.sequential
let hasSharedStructures = options.structures || options.saveStructures
let maxSharedStructures = options.maxSharedStructures
if (maxSharedStructures == null)
maxSharedStructures = hasSharedStructures ? 32 : 0
if (maxSharedStructures > 8160)
throw new Error('Maximum maxSharedStructure is 8160')
if (options.structuredClone && options.moreTypes == undefined) {
this.moreTypes = true
}
let maxOwnStructures = options.maxOwnStructures
if (maxOwnStructures == null)
maxOwnStructures = hasSharedStructures ? 32 : 64
if (!this.structures && options.useRecords != false)
this.structures = []
// two byte record ids for shared structures
let useTwoByteRecords = maxSharedStructures > 32 || (maxOwnStructures + maxSharedStructures > 64)
let sharedLimitId = maxSharedStructures + 0x40
let maxStructureId = maxSharedStructures + maxOwnStructures + 0x40
if (maxStructureId > 8256) {
throw new Error('Maximum maxSharedStructure + maxOwnStructure is 8192')
}
let recordIdsToRemove = []
let transitionsCount = 0
let serializationsSinceTransitionRebuild = 0
this.pack = this.encode = function(value, encodeOptions) {
if (!target) {
target = new ByteArrayAllocate(8192)
targetView = target.dataView || (target.dataView = new DataView(target.buffer, 0, 8192))
position = 0
}
safeEnd = target.length - 10
if (safeEnd - position < 0x800) {
// don't start too close to the end,
target = new ByteArrayAllocate(target.length)
targetView = target.dataView || (target.dataView = new DataView(target.buffer, 0, target.length))
safeEnd = target.length - 10
position = 0
} else
position = (position + 7) & 0x7ffffff8 // Word align to make any future copying of this buffer faster
start = position
if (encodeOptions & RESERVE_START_SPACE) position += (encodeOptions & 0xff)
referenceMap = packr.structuredClone ? new Map() : null
if (packr.bundleStrings && typeof value !== 'string') {
bundledStrings = []
bundledStrings.size = Infinity // force a new bundle start on first string
} else
bundledStrings = null
structures = packr.structures
if (structures) {
if (structures.uninitialized)
structures = packr._mergeStructures(packr.getStructures())
let sharedLength = structures.sharedLength || 0
if (sharedLength > maxSharedStructures) {
//if (maxSharedStructures <= 32 && structures.sharedLength > 32) // TODO: could support this, but would need to update the limit ids
throw new Error('Shared structures is larger than maximum shared structures, try increasing maxSharedStructures to ' + structures.sharedLength)
}
if (!structures.transitions) {
// rebuild our structure transitions
structures.transitions = Object.create(null)
for (let i = 0; i < sharedLength; i++) {
let keys = structures[i]
if (!keys)
continue
let nextTransition, transition = structures.transitions
for (let j = 0, l = keys.length; j < l; j++) {
let key = keys[j]
nextTransition = transition[key]
if (!nextTransition) {
nextTransition = transition[key] = Object.create(null)
}
transition = nextTransition
}
transition[RECORD_SYMBOL] = i + 0x40
}
this.lastNamedStructuresLength = sharedLength
}
if (!isSequential) {
structures.nextId = sharedLength + 0x40
}
}
if (hasSharedUpdate)
hasSharedUpdate = false
let encodingError;
try {
if (packr.randomAccessStructure && value && value.constructor && value.constructor === Object)
writeStruct(value);
else
pack(value)
let lastBundle = bundledStrings;
if (bundledStrings)
writeBundles(start, pack, 0)
if (referenceMap && referenceMap.idsToInsert) {
let idsToInsert = referenceMap.idsToInsert.sort((a, b) => a.offset > b.offset ? 1 : -1);
let i = idsToInsert.length;
let incrementPosition = -1;
while (lastBundle && i > 0) {
let insertionPoint = idsToInsert[--i].offset + start;
if (insertionPoint < (lastBundle.stringsPosition + start) && incrementPosition === -1)
incrementPosition = 0;
if (insertionPoint > (lastBundle.position + start)) {
if (incrementPosition >= 0)
incrementPosition += 6;
} else {
if (incrementPosition >= 0) {
// update the bundle reference now
targetView.setUint32(lastBundle.position + start,
targetView.getUint32(lastBundle.position + start) + incrementPosition)
incrementPosition = -1; // reset
}
lastBundle = lastBundle.previous;
i++;
}
}
if (incrementPosition >= 0 && lastBundle) {
// update the bundle reference now
targetView.setUint32(lastBundle.position + start,
targetView.getUint32(lastBundle.position + start) + incrementPosition)
}
position += idsToInsert.length * 6;
if (position > safeEnd)
makeRoom(position)
packr.offset = position
let serialized = insertIds(target.subarray(start, position), idsToInsert)
referenceMap = null
return serialized
}
packr.offset = position // update the offset so next serialization doesn't write over our buffer, but can continue writing to same buffer sequentially
if (encodeOptions & REUSE_BUFFER_MODE) {
target.start = start
target.end = position
return target
}
return target.subarray(start, position) // position can change if we call pack again in saveStructures, so we get the buffer now
} catch(error) {
encodingError = error;
throw error;
} finally {
if (structures) {
resetStructures();
if (hasSharedUpdate && packr.saveStructures) {
let sharedLength = structures.sharedLength || 0
// we can't rely on start/end with REUSE_BUFFER_MODE since they will (probably) change when we save
let returnBuffer = target.subarray(start, position)
let newSharedData = prepareStructures(structures, packr);
if (!encodingError) { // TODO: If there is an encoding error, should make the structures as uninitialized so they get rebuilt next time
if (packr.saveStructures(newSharedData, newSharedData.isCompatible) === false) {
// get updated structures and try again if the update failed
return packr.pack(value, encodeOptions)
}
packr.lastNamedStructuresLength = sharedLength
// don't keep large buffers around
if (target.length > 0x40000000) target = null
return returnBuffer
}
}
}
// don't keep large buffers around, they take too much memory and cause problems (limit at 1GB)
if (target.length > 0x40000000) target = null
if (encodeOptions & RESET_BUFFER_MODE)
position = start
}
}
const resetStructures = () => {
if (serializationsSinceTransitionRebuild < 10)
serializationsSinceTransitionRebuild++
let sharedLength = structures.sharedLength || 0
if (structures.length > sharedLength && !isSequential)
structures.length = sharedLength
if (transitionsCount > 10000) {
// force a rebuild occasionally after a lot of transitions so it can get cleaned up
structures.transitions = null
serializationsSinceTransitionRebuild = 0
transitionsCount = 0
if (recordIdsToRemove.length > 0)
recordIdsToRemove = []
} else if (recordIdsToRemove.length > 0 && !isSequential) {
for (let i = 0, l = recordIdsToRemove.length; i < l; i++) {
recordIdsToRemove[i][RECORD_SYMBOL] = 0
}
recordIdsToRemove = []
}
}
const packArray = (value) => {
var length = value.length
if (length < 0x10) {
target[position++] = 0x90 | length
} else if (length < 0x10000) {
target[position++] = 0xdc
target[position++] = length >> 8
target[position++] = length & 0xff
} else {
target[position++] = 0xdd
targetView.setUint32(position, length)
position += 4
}
for (let i = 0; i < length; i++) {
pack(value[i])
}
}
const pack = (value) => {
if (position > safeEnd)
target = makeRoom(position)
var type = typeof value
var length
if (type === 'string') {
let strLength = value.length
if (bundledStrings && strLength >= 4 && strLength < 0x1000) {
if ((bundledStrings.size += strLength) > MAX_BUNDLE_SIZE) {
let extStart
let maxBytes = (bundledStrings[0] ? bundledStrings[0].length * 3 + bundledStrings[1].length : 0) + 10
if (position + maxBytes > safeEnd)
target = makeRoom(position + maxBytes)
let lastBundle
if (bundledStrings.position) { // here we use the 0x62 extension to write the last bundle and reserve space for the reference pointer to the next/current bundle
lastBundle = bundledStrings
target[position] = 0xc8 // ext 16
position += 3 // reserve for the writing bundle size
target[position++] = 0x62 // 'b'
extStart = position - start
position += 4 // reserve for writing bundle reference
writeBundles(start, pack, 0) // write the last bundles
targetView.setUint16(extStart + start - 3, position - start - extStart)
} else { // here we use the 0x62 extension just to reserve the space for the reference pointer to the bundle (will be updated once the bundle is written)
target[position++] = 0xd6 // fixext 4
target[position++] = 0x62 // 'b'
extStart = position - start
position += 4 // reserve for writing bundle reference
}
bundledStrings = ['', ''] // create new ones
bundledStrings.previous = lastBundle;
bundledStrings.size = 0
bundledStrings.position = extStart
}
let twoByte = hasNonLatin.test(value)
bundledStrings[twoByte ? 0 : 1] += value
target[position++] = 0xc1
pack(twoByte ? -strLength : strLength);
return
}
let headerSize
// first we estimate the header size, so we can write to the correct location
if (strLength < 0x20) {
headerSize = 1
} else if (strLength < 0x100) {
headerSize = 2
} else if (strLength < 0x10000) {
headerSize = 3
} else {
headerSize = 5
}
let maxBytes = strLength * 3
if (position + maxBytes > safeEnd)
target = makeRoom(position + maxBytes)
if (strLength < 0x40 || !encodeUtf8) {
let i, c1, c2, strPosition = position + headerSize
for (i = 0; i < strLength; i++) {
c1 = value.charCodeAt(i)
if (c1 < 0x80) {
target[strPosition++] = c1
} else if (c1 < 0x800) {
target[strPosition++] = c1 >> 6 | 0xc0
target[strPosition++] = c1 & 0x3f | 0x80
} else if (
(c1 & 0xfc00) === 0xd800 &&
((c2 = value.charCodeAt(i + 1)) & 0xfc00) === 0xdc00
) {
c1 = 0x10000 + ((c1 & 0x03ff) << 10) + (c2 & 0x03ff)
i++
target[strPosition++] = c1 >> 18 | 0xf0
target[strPosition++] = c1 >> 12 & 0x3f | 0x80
target[strPosition++] = c1 >> 6 & 0x3f | 0x80
target[strPosition++] = c1 & 0x3f | 0x80
} else {
target[strPosition++] = c1 >> 12 | 0xe0
target[strPosition++] = c1 >> 6 & 0x3f | 0x80
target[strPosition++] = c1 & 0x3f | 0x80
}
}
length = strPosition - position - headerSize
} else {
length = encodeUtf8(value, position + headerSize)
}
if (length < 0x20) {
target[position++] = 0xa0 | length
} else if (length < 0x100) {
if (headerSize < 2) {
target.copyWithin(position + 2, position + 1, position + 1 + length)
}
target[position++] = 0xd9
target[position++] = length
} else if (length < 0x10000) {
if (headerSize < 3) {
target.copyWithin(position + 3, position + 2, position + 2 + length)
}
target[position++] = 0xda
target[position++] = length >> 8
target[position++] = length & 0xff
} else {
if (headerSize < 5) {
target.copyWithin(position + 5, position + 3, position + 3 + length)
}
target[position++] = 0xdb
targetView.setUint32(position, length)
position += 4
}
position += length
} else if (type === 'number') {
if (value >>> 0 === value) {// positive integer, 32-bit or less
// positive uint
if (value < 0x20 || (value < 0x80 && this.useRecords === false) || (value < 0x40 && !this.randomAccessStructure)) {
target[position++] = value
} else if (value < 0x100) {
target[position++] = 0xcc
target[position++] = value
} else if (value < 0x10000) {
target[position++] = 0xcd
target[position++] = value >> 8
target[position++] = value & 0xff
} else {
target[position++] = 0xce
targetView.setUint32(position, value)
position += 4
}
} else if (value >> 0 === value) { // negative integer
if (value >= -0x20) {
target[position++] = 0x100 + value
} else if (value >= -0x80) {
target[position++] = 0xd0
target[position++] = value + 0x100
} else if (value >= -0x8000) {
target[position++] = 0xd1
targetView.setInt16(position, value)
position += 2
} else {
target[position++] = 0xd2
targetView.setInt32(position, value)
position += 4
}
} else {
let useFloat32
if ((useFloat32 = this.useFloat32) > 0 && value < 0x100000000 && value >= -0x80000000) {
target[position++] = 0xca
targetView.setFloat32(position, value)
let xShifted
if (useFloat32 < 4 ||
// this checks for rounding of numbers that were encoded in 32-bit float to nearest significant decimal digit that could be preserved
((xShifted = value * mult10[((target[position] & 0x7f) << 1) | (target[position + 1] >> 7)]) >> 0) === xShifted) {
position += 4
return
} else
position-- // move back into position for writing a double
}
target[position++] = 0xcb
targetView.setFloat64(position, value)
position += 8
}
} else if (type === 'object' || type === 'function') {
if (!value)
target[position++] = 0xc0
else {
if (referenceMap) {
let referee = referenceMap.get(value)
if (referee) {
if (!referee.id) {
let idsToInsert = referenceMap.idsToInsert || (referenceMap.idsToInsert = [])
referee.id = idsToInsert.push(referee)
}
target[position++] = 0xd6 // fixext 4
target[position++] = 0x70 // "p" for pointer
targetView.setUint32(position, referee.id)
position += 4
return
} else
referenceMap.set(value, { offset: position - start })
}
let constructor = value.constructor
if (constructor === Object) {
writeObject(value)
} else if (constructor === Array) {
packArray(value)
} else if (constructor === Map) {
if (this.mapAsEmptyObject) target[position++] = 0x80
else {
length = value.size
if (length < 0x10) {
target[position++] = 0x80 | length
} else if (length < 0x10000) {
target[position++] = 0xde
target[position++] = length >> 8
target[position++] = length & 0xff
} else {
target[position++] = 0xdf
targetView.setUint32(position, length)
position += 4
}
for (let [key, entryValue] of value) {
pack(key)
pack(entryValue)
}
}
} else {
for (let i = 0, l = extensions.length; i < l; i++) {
let extensionClass = extensionClasses[i]
if (value instanceof extensionClass) {
let extension = extensions[i]
if (extension.write) {
if (extension.type) {
target[position++] = 0xd4 // one byte "tag" extension
target[position++] = extension.type
target[position++] = 0
}
let writeResult = extension.write.call(this, value)
if (writeResult === value) { // avoid infinite recursion
if (Array.isArray(value)) {
packArray(value)
} else {
writeObject(value)
}
} else {
pack(writeResult)
}
return
}
let currentTarget = target
let currentTargetView = targetView
let currentPosition = position
target = null
let result
try {
result = extension.pack.call(this, value, (size) => {
// restore target and use it
target = currentTarget
currentTarget = null
position += size
if (position > safeEnd)
makeRoom(position)
return {
target, targetView, position: position - size
}
}, pack)
} finally {
// restore current target information (unless already restored)
if (currentTarget) {
target = currentTarget
targetView = currentTargetView
position = currentPosition
safeEnd = target.length - 10
}
}
if (result) {
if (result.length + position > safeEnd)
makeRoom(result.length + position)
position = writeExtensionData(result, target, position, extension.type)
}
return
}
}
// check isArray after extensions, because extensions can extend Array
if (Array.isArray(value)) {
packArray(value)
} else {
// use this as an alternate mechanism for expressing how to serialize
if (value.toJSON) {
const json = value.toJSON()
// if for some reason value.toJSON returns itself it'll loop forever
if (json !== value)
return pack(json)
}
// if there is a writeFunction, use it, otherwise just encode as undefined
if (type === 'function')
return pack(this.writeFunction && this.writeFunction(value));
// no extension found, write as plain object
writeObject(value)
}
}
}
} else if (type === 'boolean') {
target[position++] = value ? 0xc3 : 0xc2
} else if (type === 'bigint') {
if (value < 0x8000000000000000 && value >= -0x8000000000000000) {
// use a signed int as long as it fits
target[position++] = 0xd3
targetView.setBigInt64(position, value)
} else if (value < 0x10000000000000000 && value > 0) {
// if we can fit an unsigned int, use that
target[position++] = 0xcf
targetView.setBigUint64(position, value)
} else {
// overflow
if (this.largeBigIntToFloat) {
target[position++] = 0xcb
targetView.setFloat64(position, Number(value))
} else if (this.largeBigIntToString) {
return pack(value.toString());
} else if (this.useBigIntExtension || this.moreTypes) {
let empty = value < 0 ? BigInt(-1) : BigInt(0)
let array
if (value >> BigInt(0x10000) === empty) {
let mask = BigInt(0x10000000000000000) - BigInt(1) // literal would overflow
let chunks = []
do {
chunks.push(value & mask)
value >>= BigInt(64)
} while (value !== empty)
array = new Uint8Array(new BigUint64Array(chunks).buffer)
array.reverse()
} else {
let invert = value < 0
let string = (invert ? ~value : value).toString(16)
if (string.length % 2) {
string = '0' + string
} else if (parseInt(string.charAt(0), 16) >= 8) {
string = '00' + string
}
if (hasNodeBuffer) {
array = Buffer.from(string, 'hex')
} else {
array = new Uint8Array(string.length / 2)
for (let i = 0; i < array.length; i++) {
array[i] = parseInt(string.slice(i * 2, i * 2 + 2), 16)
}
}
if (invert) {
for (let i = 0; i < array.length; i++) array[i] = ~array[i]
}
}
if (array.length + position > safeEnd)
makeRoom(array.length + position)
position = writeExtensionData(array, target, position, 0x42)
return
} else {
throw new RangeError(value + ' was too large to fit in MessagePack 64-bit integer format, use' +
' useBigIntExtension, or set largeBigIntToFloat to convert to float-64, or set' +
' largeBigIntToString to convert to string')
}
}
position += 8
} else if (type === 'undefined') {
if (this.encodeUndefinedAsNil)
target[position++] = 0xc0
else {
target[position++] = 0xd4 // a number of implementations use fixext1 with type 0, data 0 to denote undefined, so we follow suite
target[position++] = 0
target[position++] = 0
}
} else {
throw new Error('Unknown type: ' + type)
}
}
const writePlainObject = (this.variableMapSize || this.coercibleKeyAsNumber || this.skipValues) ? (object) => {
// this method is slightly slower, but generates "preferred serialization" (optimally small for smaller objects)
let keys;
if (this.skipValues) {
keys = [];
for (let key in object) {
if ((typeof object.hasOwnProperty !== 'function' || object.hasOwnProperty(key)) &&
!this.skipValues.includes(object[key]))
keys.push(key);
}
} else {
keys = Object.keys(object)
}
let length = keys.length
if (length < 0x10) {
target[position++] = 0x80 | length
} else if (length < 0x10000) {
target[position++] = 0xde
target[position++] = length >> 8
target[position++] = length & 0xff
} else {
target[position++] = 0xdf
targetView.setUint32(position, length)
position += 4
}
let key
if (this.coercibleKeyAsNumber) {
for (let i = 0; i < length; i++) {
key = keys[i]
let num = Number(key)
pack(isNaN(num) ? key : num)
pack(object[key])
}
} else {
for (let i = 0; i < length; i++) {
pack(key = keys[i])
pack(object[key])
}
}
} :
(object) => {
target[position++] = 0xde // always using map 16, so we can preallocate and set the length afterwards
let objectOffset = position - start
position += 2
let size = 0
for (let key in object) {
if (typeof object.hasOwnProperty !== 'function' || object.hasOwnProperty(key)) {
pack(key)
pack(object[key])
size++
}
}
if (size > 0xffff) {
throw new Error('Object is too large to serialize with fast 16-bit map size,' +
' use the "variableMapSize" option to serialize this object');
}
target[objectOffset++ + start] = size >> 8
target[objectOffset + start] = size & 0xff
}
const writeRecord = this.useRecords === false ? writePlainObject :
(options.progressiveRecords && !useTwoByteRecords) ? // this is about 2% faster for highly stable structures, since it only requires one for-in loop (but much more expensive when new structure needs to be written)
(object) => {
let nextTransition, transition = structures.transitions || (structures.transitions = Object.create(null))
let objectOffset = position++ - start
let wroteKeys
for (let key in object) {
if (typeof object.hasOwnProperty !== 'function' || object.hasOwnProperty(key)) {
nextTransition = transition[key]
if (nextTransition)
transition = nextTransition
else {
// record doesn't exist, create full new record and insert it
let keys = Object.keys(object)
let lastTransition = transition
transition = structures.transitions
let newTransitions = 0
for (let i = 0, l = keys.length; i < l; i++) {
let key = keys[i]
nextTransition = transition[key]
if (!nextTransition) {
nextTransition = transition[key] = Object.create(null)
newTransitions++
}
transition = nextTransition
}
if (objectOffset + start + 1 == position) {
// first key, so we don't need to insert, we can just write record directly
position--
newRecord(transition, keys, newTransitions)
} else // otherwise we need to insert the record, moving existing data after the record
insertNewRecord(transition, keys, objectOffset, newTransitions)
wroteKeys = true
transition = lastTransition[key]
}
pack(object[key])
}
}
if (!wroteKeys) {
let recordId = transition[RECORD_SYMBOL]
if (recordId)
target[objectOffset + start] = recordId
else
insertNewRecord(transition, Object.keys(object), objectOffset, 0)
}
} :
(object) => {
let nextTransition, transition = structures.transitions || (structures.transitions = Object.create(null))
let newTransitions = 0
for (let key in object) if (typeof object.hasOwnProperty !== 'function' || object.hasOwnProperty(key)) {
nextTransition = transition[key]
if (!nextTransition) {
nextTransition = transition[key] = Object.create(null)
newTransitions++
}
transition = nextTransition
}
let recordId = transition[RECORD_SYMBOL]
if (recordId) {
if (recordId >= 0x60 && useTwoByteRecords) {
target[position++] = ((recordId -= 0x60) & 0x1f) + 0x60
target[position++] = recordId >> 5
} else
target[position++] = recordId
} else {
newRecord(transition, transition.__keys__ || Object.keys(object), newTransitions)
}
// now write the values
for (let key in object)
if (typeof object.hasOwnProperty !== 'function' || object.hasOwnProperty(key)) {
pack(object[key])
}
}
// create reference to useRecords if useRecords is a function
const checkUseRecords = typeof this.useRecords == 'function' && this.useRecords;
const writeObject = checkUseRecords ? (object) => {
checkUseRecords(object) ? writeRecord(object) : writePlainObject(object)
} : writeRecord
const makeRoom = (end) => {
let newSize
if (end > 0x1000000) {
// special handling for really large buffers
if ((end - start) > MAX_BUFFER_SIZE)
throw new Error('Packed buffer would be larger than maximum buffer size')
newSize = Math.min(MAX_BUFFER_SIZE,
Math.round(Math.max((end - start) * (end > 0x4000000 ? 1.25 : 2), 0x400000) / 0x1000) * 0x1000)
} else // faster handling for smaller buffers
newSize = ((Math.max((end - start) << 2, target.length - 1) >> 12) + 1) << 12
let newBuffer = new ByteArrayAllocate(newSize)
targetView = newBuffer.dataView || (newBuffer.dataView = new DataView(newBuffer.buffer, 0, newSize))
end = Math.min(end, target.length)
if (target.copy)
target.copy(newBuffer, 0, start, end)
else
newBuffer.set(target.slice(start, end))
position -= start
start = 0
safeEnd = newBuffer.length - 10
return target = newBuffer
}
const newRecord = (transition, keys, newTransitions) => {
let recordId = structures.nextId
if (!recordId)
recordId = 0x40
if (recordId < sharedLimitId && this.shouldShareStructure && !this.shouldShareStructure(keys)) {
recordId = structures.nextOwnId
if (!(recordId < maxStructureId))
recordId = sharedLimitId
structures.nextOwnId = recordId + 1
} else {
if (recordId >= maxStructureId)// cycle back around
recordId = sharedLimitId
structures.nextId = recordId + 1
}
let highByte = keys.highByte = recordId >= 0x60 && useTwoByteRecords ? (recordId - 0x60) >> 5 : -1
transition[RECORD_SYMBOL] = recordId
transition.__keys__ = keys
structures[recordId - 0x40] = keys
if (recordId < sharedLimitId) {
keys.isShared = true
structures.sharedLength = recordId - 0x3f
hasSharedUpdate = true
if (highByte >= 0) {
target[position++] = (recordId & 0x1f) + 0x60
target[position++] = highByte
} else {
target[position++] = recordId
}
} else {
if (highByte >= 0) {
target[position++] = 0xd5 // fixext 2
target[position++] = 0x72 // "r" record defintion extension type
target[position++] = (recordId & 0x1f) + 0x60
target[position++] = highByte
} else {
target[position++] = 0xd4 // fixext 1
target[position++] = 0x72 // "r" record defintion extension type
target[position++] = recordId
}
if (newTransitions)
transitionsCount += serializationsSinceTransitionRebuild * newTransitions
// record the removal of the id, we can maintain our shared structure
if (recordIdsToRemove.length >= maxOwnStructures)
recordIdsToRemove.shift()[RECORD_SYMBOL] = 0 // we are cycling back through, and have to remove old ones
recordIdsToRemove.push(transition)
pack(keys)
}
}
const insertNewRecord = (transition, keys, insertionOffset, newTransitions) => {
let mainTarget = target
let mainPosition = position
let mainSafeEnd = safeEnd
let mainStart = start
target = keysTarget
position = 0
start = 0
if (!target)
keysTarget = target = new ByteArrayAllocate(8192)
safeEnd = target.length - 10
newRecord(transition, keys, newTransitions)
keysTarget = target
let keysPosition = position
target = mainTarget
position = mainPosition
safeEnd = mainSafeEnd
start = mainStart
if (keysPosition > 1) {
let newEnd = position + keysPosition - 1
if (newEnd > safeEnd)
makeRoom(newEnd)
let insertionPosition = insertionOffset + start
target.copyWithin(insertionPosition + keysPosition, insertionPosition + 1, position)
target.set(keysTarget.slice(0, keysPosition), insertionPosition)
position = newEnd
} else {
target[insertionOffset + start] = keysTarget[0]
}
}
const writeStruct = (object) => {
let newPosition = writeStructSlots(object, target, start, position, structures, makeRoom, (value, newPosition, notifySharedUpdate) => {
if (notifySharedUpdate)
return hasSharedUpdate = true;
position = newPosition;
let startTarget = target;
pack(value);
resetStructures();
if (startTarget !== target) {
return { position, targetView, target }; // indicate the buffer was re-allocated
}
return position;
}, this);
if (newPosition === 0) // bail and go to a msgpack object
return writeObject(object);
position = newPosition;
}
}
useBuffer(buffer) {
// this means we are finished using our own buffer and we can write over it safely
target = buffer
target.dataView || (target.dataView = new DataView(target.buffer, target.byteOffset, target.byteLength))
position = 0
}
set position (value) {
position = value;
}
get position() {
return position;
}
clearSharedData() {
if (this.structures)
this.structures = []
if (this.typedStructs)
this.typedStructs = []
}
}
extensionClasses = [ Date, Set, Error, RegExp, ArrayBuffer, Object.getPrototypeOf(Uint8Array.prototype).constructor /*TypedArray*/, DataView, C1Type ]
extensions = [{
pack(date, allocateForWrite, pack) {
let seconds = date.getTime() / 1000
if ((this.useTimestamp32 || date.getMilliseconds() === 0) && seconds >= 0 && seconds < 0x100000000) {
// Timestamp 32
let { target, targetView, position} = allocateForWrite(6)
target[position++] = 0xd6
target[position++] = 0xff
targetView.setUint32(position, seconds)
} else if (seconds > 0 && seconds < 0x100000000) {
// Timestamp 64
let { target, targetView, position} = allocateForWrite(10)
target[position++] = 0xd7
target[position++] = 0xff
targetView.setUint32(position, date.getMilliseconds() * 4000000 + ((seconds / 1000 / 0x100000000) >> 0))
targetView.setUint32(position + 4, seconds)
} else if (isNaN(seconds)) {
if (this.onInvalidDate) {
allocateForWrite(0)
return pack(this.onInvalidDate())
}
// Intentionally invalid timestamp
let { target, targetView, position} = allocateForWrite(3)
target[position++] = 0xd4
target[position++] = 0xff
target[position++] = 0xff
} else {
// Timestamp 96
let { target, targetView, position} = allocateForWrite(15)
target[position++] = 0xc7
target[position++] = 12
target[position++] = 0xff
targetView.setUint32(position, date.getMilliseconds() * 1000000)
targetView.setBigInt64(position + 4, BigInt(Math.floor(seconds)))
}
}
}, {
pack(set, allocateForWrite, pack) {
if (this.setAsEmptyObject) {
allocateForWrite(0);
return pack({})
}
let array = Array.from(set)
let { target, position} = allocateForWrite(this.moreTypes ? 3 : 0)
if (this.moreTypes) {
target[position++] = 0xd4
target[position++] = 0x73 // 's' for Set
target[position++] = 0
}
pack(array)
}
}, {
pack(error, allocateForWrite, pack) {
let { target, position} = allocateForWrite(this.moreTypes ? 3 : 0)
if (this.moreTypes) {
target[position++] = 0xd4
target[position++] = 0x65 // 'e' for error
target[position++] = 0
}
pack([ error.name, error.message, error.cause ])
}
}, {
pack(regex, allocateForWrite, pack) {
let { target, position} = allocateForWrite(this.moreTypes ? 3 : 0)
if (this.moreTypes) {
target[position++] = 0xd4
target[position++] = 0x78 // 'x' for regeXp
target[position++] = 0
}
pack([ regex.source, regex.flags ])
}
}, {
pack(arrayBuffer, allocateForWrite) {
if (this.moreTypes)
writeExtBuffer(arrayBuffer, 0x10, allocateForWrite)
else
writeBuffer(hasNodeBuffer ? Buffer.from(arrayBuffer) : new Uint8Array(arrayBuffer), allocateForWrite)
}
}, {
pack(typedArray, allocateForWrite) {
let constructor = typedArray.constructor
if (constructor !== ByteArray && this.moreTypes)
writeExtBuffer(typedArray, typedArrays.indexOf(constructor.name), allocateForWrite)
else
writeBuffer(typedArray, allocateForWrite)
}
}, {
pack(arrayBuffer, allocateForWrite) {
if (this.moreTypes)
writeExtBuffer(arrayBuffer, 0x11, allocateForWrite)
else
writeBuffer(hasNodeBuffer ? Buffer.from(arrayBuffer) : new Uint8Array(arrayBuffer), allocateForWrite)
}
}, {
pack(c1, allocateForWrite) { // specific 0xC1 object
let { target, position} = allocateForWrite(1)
target[position] = 0xc1
}
}]
function writeExtBuffer(typedArray, type, allocateForWrite, encode) {
let length = typedArray.byteLength
if (length + 1 < 0x100) {
var { target, position } = allocateForWrite(4 + length)
target[position++] = 0xc7
target[position++] = length + 1
} else if (length + 1 < 0x10000) {
var { target, position } = allocateForWrite(5 + length)
target[position++] = 0xc8
target[position++] = (length + 1) >> 8
target[position++] = (length + 1) & 0xff
} else {
var { target, position, targetView } = allocateForWrite(7 + length)
target[position++] = 0xc9
targetView.setUint32(position, length + 1) // plus one for the type byte
position += 4