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tar -r\nimport { WriteStream, WriteStreamSync } from '@isaacs/fs-minipass'\nimport { Minipass } from 'minipass'\nimport fs from 'node:fs'\nimport path from 'node:path'\nimport { Header } from './header.js'\nimport { list } from './list.js'\nimport { makeCommand } from './make-command.js'\nimport {\n  isFile,\n  TarOptionsFile,\n  TarOptionsSyncFile,\n} from './options.js'\nimport { Pack, PackSync } from './pack.js'\n\n// starting at the head of the file, read a Header\n// If the checksum is invalid, that's our position to start writing\n// If it is, jump forward by the specified size (round up to 512)\n// and try again.\n// Write the new Pack stream starting there.\n\nconst replaceSync = (opt: TarOptionsSyncFile, files: string[]) => {\n  const p = new PackSync(opt)\n\n  let threw = true\n  let fd\n  let position\n\n  try {\n    try {\n      fd = fs.openSync(opt.file, 'r+')\n    } catch (er) {\n      if ((er as NodeJS.ErrnoException)?.code === 'ENOENT') {\n        fd = fs.openSync(opt.file, 'w+')\n      } else {\n        throw er\n      }\n    }\n\n    const st = fs.fstatSync(fd)\n    const headBuf = Buffer.alloc(512)\n\n    POSITION: for (\n      position = 0;\n      position < st.size;\n      position += 512\n    ) {\n      for (let bufPos = 0, bytes = 0; bufPos < 512; bufPos += bytes) {\n        bytes = fs.readSync(\n          fd,\n          headBuf,\n          bufPos,\n          headBuf.length - bufPos,\n          position + bufPos,\n        )\n\n        if (\n          position === 0 &&\n          headBuf[0] === 0x1f &&\n          headBuf[1] === 0x8b\n        ) {\n          throw new Error('cannot append to compressed archives')\n        }\n\n        if (!bytes) {\n          break POSITION\n        }\n      }\n\n      const h = new Header(headBuf)\n      if (!h.cksumValid) {\n        break\n      }\n      const entryBlockSize = 512 * Math.ceil((h.size || 0) / 512)\n      if (position + entryBlockSize + 512 > st.size) {\n        break\n      }\n      // the 512 for the header we just parsed will be added as well\n      // also jump ahead all the blocks for the body\n      position += entryBlockSize\n      if (opt.mtimeCache && h.mtime) {\n        opt.mtimeCache.set(String(h.path), h.mtime)\n      }\n    }\n    threw = false\n\n    streamSync(opt, p, position, fd, files)\n  } finally {\n    if (threw) {\n      try {\n        fs.closeSync(fd as number)\n      } catch (er) {}\n    }\n  }\n}\n\nconst streamSync = (\n  opt: TarOptionsSyncFile,\n  p: Pack,\n  position: number,\n  fd: number,\n  files: string[],\n) => {\n  const stream = new WriteStreamSync(opt.file, {\n    fd: fd,\n    start: position,\n  })\n  p.pipe(stream as unknown as Minipass.Writable)\n  addFilesSync(p, files)\n}\n\nconst replaceAsync = (\n  opt: TarOptionsFile,\n  files: string[],\n): Promise<void> => {\n  files = Array.from(files)\n  const p = new Pack(opt)\n\n  const getPos = (\n    fd: number,\n    size: number,\n    cb_: (er?: null | Error, pos?: number) => void,\n  ) => {\n    const cb = (er?: Error | null, pos?: number) => {\n      if (er) {\n        fs.close(fd, _ => cb_(er))\n      } else {\n        cb_(null, pos)\n      }\n    }\n\n    let position = 0\n    if (size === 0) {\n      return cb(null, 0)\n    }\n\n    let bufPos = 0\n    const headBuf = Buffer.alloc(512)\n    const onread = (er?: null | Error, bytes?: number): void => {\n      if (er || typeof bytes === 'undefined') {\n        return cb(er)\n      }\n      bufPos += bytes\n      if (bufPos < 512 && bytes) {\n        return fs.read(\n          fd,\n          headBuf,\n          bufPos,\n          headBuf.length - bufPos,\n          position + bufPos,\n          onread,\n        )\n      }\n\n      if (\n        position === 0 &&\n        headBuf[0] === 0x1f &&\n        headBuf[1] === 0x8b\n      ) {\n        return cb(new Error('cannot append to compressed archives'))\n      }\n\n      // truncated header\n      if (bufPos < 512) {\n        return cb(null, position)\n      }\n\n      const h = new Header(headBuf)\n      if (!h.cksumValid) {\n        return cb(null, position)\n      }\n\n      /* c8 ignore next */\n      const entryBlockSize = 512 * Math.ceil((h.size ?? 0) / 512)\n      if (position + entryBlockSize + 512 > size) {\n        return cb(null, position)\n      }\n\n      position += entryBlockSize + 512\n      if (position >= size) {\n        return cb(null, position)\n      }\n\n      if (opt.mtimeCache && h.mtime) {\n        opt.mtimeCache.set(String(h.path), h.mtime)\n      }\n      bufPos = 0\n      fs.read(fd, headBuf, 0, 512, position, onread)\n    }\n    fs.read(fd, headBuf, 0, 512, position, onread)\n  }\n\n  const promise = new Promise<void>((resolve, reject) => {\n    p.on('error', reject)\n    let flag = 'r+'\n    const onopen = (\n      er?: NodeJS.ErrnoException | null,\n      fd?: number,\n    ) => {\n      if (er && er.code === 'ENOENT' && flag === 'r+') {\n        flag = 'w+'\n        return fs.open(opt.file, flag, onopen)\n      }\n\n      if (er || !fd) {\n        return reject(er)\n      }\n\n      fs.fstat(fd, (er, st) => {\n        if (er) {\n          return fs.close(fd, () => reject(er))\n        }\n\n        getPos(fd, st.size, (er, position) => {\n          if (er) {\n            return reject(er)\n          }\n          const stream = new WriteStream(opt.file, {\n            fd: fd,\n            start: position,\n          })\n          p.pipe(stream as unknown as Minipass.Writable)\n          stream.on('error', reject)\n          stream.on('close', resolve)\n          addFilesAsync(p, files)\n        })\n      })\n    }\n    fs.open(opt.file, flag, onopen)\n  })\n\n  return promise\n}\n\nconst addFilesSync = (p: Pack, files: string[]) => {\n  files.forEach(file => {\n    if (file.charAt(0) === '@') {\n      list({\n        file: path.resolve(p.cwd, file.slice(1)),\n        sync: true,\n        noResume: true,\n        onReadEntry: entry => p.add(entry),\n      })\n    } else {\n      p.add(file)\n    }\n  })\n  p.end()\n}\n\nconst addFilesAsync = async (\n  p: Pack,\n  files: string[],\n): Promise<void> => {\n  for (let i = 0; i < files.length; i++) {\n    const file = String(files[i])\n    if (file.charAt(0) === '@') {\n      await list({\n        file: path.resolve(String(p.cwd), file.slice(1)),\n        noResume: true,\n        onReadEntry: entry => p.add(entry),\n      })\n    } else {\n      p.add(file)\n    }\n  }\n  p.end()\n}\n\nexport const replace = makeCommand(\n  replaceSync,\n  replaceAsync,\n  /* c8 ignore start */\n  (): never => {\n    throw new TypeError('file is required')\n  },\n  (): never => {\n    throw new TypeError('file is required')\n  },\n  /* c8 ignore stop */\n  (opt, entries) => {\n    if (!isFile(opt)) {\n      throw new TypeError('file is required')\n    }\n\n    if (\n      opt.gzip ||\n      opt.brotli ||\n      opt.file.endsWith('.br') ||\n      opt.file.endsWith('.tbr')\n    ) {\n      throw new TypeError('cannot append to compressed archives')\n    }\n\n    if (!entries?.length) {\n      throw new TypeError('no paths specified to add/replace')\n    }\n  },\n)\n"]}