mirror of
https://github.com/vatesfr/xen-orchestra.git
synced 2026-09-11 06:29:51 -05:00
4e50858526
this merge code leverage the new classes introduced to handle qcow2, improving our flexibility, and future uses. this also improve the performance on "block mode" backups (s3/ azure and other storage with the option), since it reliably updates the block allocation table only at the end of the merge instead of each time a new block is detected
77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
'use strict'
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/**
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* @typedef {(Object)} DiskGeometry
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* @property {(number)} cylinders
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* @property {(number)} heads
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* @property {(number)} sectorsPerTrackCylinder
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*
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* @typedef {(Object)} VhdFooter
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* @property {(string)} cookie
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* @property {(number)} features
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* @property {(number)} fileFormatVersion
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* @property {(number)} dataOffset
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* @property {(number)} timestamp
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* @property {(string)} creatorApplication
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* @property {(number)} creatorVersion
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* @property {(number)} creatorHostOs
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* @property {(number)} originalSize
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* @property {(number)} currentSize
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* @property {(DiskGeometry)} diskGeometry
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* @property {(number)} diskType
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* @property {(number)} checksum
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* @property {(Buffer)} uuid
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* @property {(string)} saved
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* @property {(string)} hidden
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* @property {(string)} reserved
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*/
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const { v4: generateUuid } = require('uuid')
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const { checksumStruct, fuFooter, fuHeader } = require('./_structs')
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const {
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CREATOR_APPLICATION,
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DEFAULT_BLOCK_SIZE: VHD_BLOCK_SIZE_BYTES,
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DISK_TYPES,
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FILE_FORMAT_VERSION,
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FOOTER_COOKIE,
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FOOTER_SIZE,
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HEADER_COOKIE,
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HEADER_SIZE,
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HEADER_VERSION,
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PLATFORMS,
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} = require('./_constants')
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exports.createFooter = function createFooter(size, timestamp, geometry, dataOffset, diskType = DISK_TYPES.FIXED) {
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const footer = fuFooter.pack({
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cookie: FOOTER_COOKIE,
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features: 2,
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fileFormatVersion: FILE_FORMAT_VERSION,
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dataOffset,
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timestamp,
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creatorApplication: CREATOR_APPLICATION,
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creatorHostOs: PLATFORMS.WI2K, // it looks like everybody is using Wi2k
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originalSize: size,
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currentSize: size,
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diskGeometry: geometry,
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diskType,
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uuid: generateUuid(null, Buffer.allocUnsafe(16)),
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})
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checksumStruct(footer, fuFooter)
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return footer
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}
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exports.createHeader = function createHeader(
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maxTableEntries,
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tableOffset = HEADER_SIZE + FOOTER_SIZE,
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blockSize = VHD_BLOCK_SIZE_BYTES
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) {
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const header = fuHeader.pack({
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cookie: HEADER_COOKIE,
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tableOffset,
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headerVersion: HEADER_VERSION,
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maxTableEntries,
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blockSize,
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})
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checksumStruct(header, fuHeader)
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return header
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}
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