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replace.js

'use strict'

// tar -r
const hlo = require('./high-level-opt.js')
const Pack = require('./pack.js')
const fs = require('fs')
const fsm = require('fs-minipass')
const t = require('./list.js')
const path = require('path')

// starting at the head of the file, read a Header
// If the checksum is invalid, that's our position to start writing
// If it is, jump forward by the specified size (round up to 512)
// and try again.
// Write the new Pack stream starting there.

const Header = require('./header.js')

module.exports = (opt_, files, cb) => {
  const opt = hlo(opt_)

if (!opt.file) {
    throw new TypeError('file is required')
  }

if (opt.gzip || opt.brotli || opt.file.endsWith('.br') || opt.file.endsWith('.tbr')) {
    throw new TypeError('cannot append to compressed archives')
  }

if (!files || !Array.isArray(files) || !files.length) {
    throw new TypeError('no files or directories specified')
  }

files = Array.from(files)

return opt.sync ? replaceSync(opt, files)
    : replace(opt, files, cb)
}

const replaceSync = (opt, files) => {
  const p = new Pack.Sync(opt)

let threw = true
  let fd
  let position

try {
    try {
      fd = fs.openSync(opt.file, 'r+')
    } catch (er) {
      if (er.code === 'ENOENT') {
        fd = fs.openSync(opt.file, 'w+')
      } else {
        throw er
      }
    }

const st = fs.fstatSync(fd)
    const headBuf = Buffer.alloc(512)

POSITION: for (position = 0; position < st.size; position += 512) {
      for (let bufPos = 0, bytes = 0; bufPos < 512; bufPos += bytes) {
        bytes = fs.readSync(
          fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos
        )

if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b) {
          throw new Error('cannot append to compressed archives')
        }

if (!bytes) {
          break POSITION
        }
      }

const h = new Header(headBuf)
      if (!h.cksumValid) {
        break
      }
      const entryBlockSize = 512 * Math.ceil(h.size / 512)
      if (position + entryBlockSize + 512 > st.size) {
        break
      }
      // the 512 for the header we just parsed will be added as well
      // also jump ahead all the blocks for the body
      position += entryBlockSize
      if (opt.mtimeCache) {
        opt.mtimeCache.set(h.path, h.mtime)
      }
    }
    threw = false

streamSync(opt, p, position, fd, files)
  } finally {
    if (threw) {
      try {
        fs.closeSync(fd)
      } catch (er) {}
    }
  }
}

const streamSync = (opt, p, position, fd, files) => {
  const stream = new fsm.WriteStreamSync(opt.file, {
    fd: fd,
    start: position,
  })
  p.pipe(stream)
  addFilesSync(p, files)
}

const replace = (opt, files, cb) => {
  files = Array.from(files)
  const p = new Pack(opt)

const getPos = (fd, size, cb_) => {
    const cb = (er, pos) => {
      if (er) {
        fs.close(fd, _ => cb_(er))
      } else {
        cb_(null, pos)
      }
    }

let position = 0
    if (size === 0) {
      return cb(null, 0)
    }

let bufPos = 0
    const headBuf = Buffer.alloc(512)
    const onread = (er, bytes) => {
      if (er) {
        return cb(er)
      }
      bufPos += bytes
      if (bufPos < 512 && bytes) {
        return fs.read(
          fd, headBuf, bufPos, headBuf.length - bufPos,
          position + bufPos, onread
        )
      }

if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b) {
        return cb(new Error('cannot append to compressed archives'))
      }

// truncated header
      if (bufPos < 512) {
        return cb(null, position)
      }

const h = new Header(headBuf)
      if (!h.cksumValid) {
        return cb(null, position)
      }

const entryBlockSize = 512 * Math.ceil(h.size / 512)
      if (position + entryBlockSize + 512 > size) {
        return cb(null, position)
      }

position += entryBlockSize + 512
      if (position >= size) {
        return cb(null, position)
      }

if (opt.mtimeCache) {
        opt.mtimeCache.set(h.path, h.mtime)
      }
      bufPos = 0
      fs.read(fd, headBuf, 0, 512, position, onread)
    }
    fs.read(fd, headBuf, 0, 512, position, onread)
  }

const promise = new Promise((resolve, reject) => {
    p.on('error', reject)
    let flag = 'r+'
    const onopen = (er, fd) => {
      if (er && er.code === 'ENOENT' && flag === 'r+') {
        flag = 'w+'
        return fs.open(opt.file, flag, onopen)
      }

if (er) {
        return reject(er)
      }

fs.fstat(fd, (er, st) => {
        if (er) {
          return fs.close(fd, () => reject(er))
        }

getPos(fd, st.size, (er, position) => {
          if (er) {
            return reject(er)
          }
          const stream = new fsm.WriteStream(opt.file, {
            fd: fd,
            start: position,
          })
          p.pipe(stream)
          stream.on('error', reject)
          stream.on('close', resolve)
          addFilesAsync(p, files)
        })
      })
    }
    fs.open(opt.file, flag, onopen)
  })

return cb ? promise.then(cb, cb) : promise
}

const addFilesSync = (p, files) => {
  files.forEach(file => {
    if (file.charAt(0) === '@') {
      t({
        file: path.resolve(p.cwd, file.slice(1)),
        sync: true,
        noResume: true,
        onentry: entry => p.add(entry),
      })
    } else {
      p.add(file)
    }
  })
  p.end()
}

const addFilesAsync = (p, files) => {
  while (files.length) {
    const file = files.shift()
    if (file.charAt(0) === '@') {
      return t({
        file: path.resolve(p.cwd, file.slice(1)),
        noResume: true,
        onentry: entry => p.add(entry),
      }).then(_ => addFilesAsync(p, files))
    } else {
      p.add(file)
    }
  }
  p.end()
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-08 11:35:40
..	dir	-	root/root	0755	2026-02-08 11:35:40
create.js	text/plain	2.34 KB	root/root	0644	2026-02-03 12:27:10
extract.js	text/plain	2.79 KB	root/root	0644	2026-02-03 12:27:10
get-write-flag.js	text/plain	921 B	root/root	0644	2026-02-03 12:27:10
header.js	text/plain	8.94 KB	root/root	0644	2026-02-03 12:27:10
high-level-opt.js	text/plain	760 B	root/root	0644	2026-02-03 12:27:10
large-numbers.js	text/plain	2.18 KB	root/root	0644	2026-02-03 12:27:10
list.js	text/plain	3.15 KB	root/root	0644	2026-02-03 12:27:10
mkdir.js	text/plain	5.36 KB	root/root	0644	2026-02-03 12:27:10
mode-fix.js	text/plain	649 B	root/root	0644	2026-02-03 12:27:10
normalize-unicode.js	text/plain	412 B	root/root	0644	2026-02-03 12:27:10
normalize-windows-path.js	text/plain	410 B	root/root	0644	2026-02-03 12:27:10
pack.js	text/plain	9.79 KB	root/root	0644	2026-02-03 12:27:10
parse.js	text/plain	15.94 KB	root/root	0644	2026-02-03 12:27:10
path-reservations.js	text/plain	4.31 KB	root/root	0644	2026-02-03 12:27:10
pax.js	text/plain	3.97 KB	root/root	0644	2026-02-03 12:27:10
read-entry.js	text/plain	2.78 KB	root/root	0644	2026-02-03 12:27:10
replace.js	text/plain	5.64 KB	root/root	0644	2026-02-03 12:27:10
strip-absolute-path.js	text/plain	917 B	root/root	0644	2026-02-03 12:27:10
strip-trailing-slashes.js	text/plain	394 B	root/root	0644	2026-02-03 12:27:10
types.js	text/plain	1.07 KB	root/root	0644	2026-02-03 12:27:10
unpack.js	text/plain	25.23 KB	root/root	0644	2026-02-03 12:27:10
update.js	text/plain	937 B	root/root	0644	2026-02-03 12:27:10
warn-mixin.js	text/plain	725 B	root/root	0644	2026-02-03 12:27:10
winchars.js	text/plain	535 B	root/root	0644	2026-02-03 12:27:10
write-entry.js	text/plain	14.94 KB	root/root	0644	2026-02-03 12:27:10

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