1 files changed, 113 insertions, 0 deletions
diff --git a/node_modules/tar/lib/extract.js b/node_modules/tar/lib/extract.js
new file mode 100644
index 0000000..5476798
--- /dev/null
+++ b/node_modules/tar/lib/extract.js
@@ -0,0 +1,113 @@
+'use strict'
+
+// tar -x
+const hlo = require('./high-level-opt.js')
+const Unpack = require('./unpack.js')
+const fs = require('fs')
+const fsm = require('fs-minipass')
+const path = require('path')
+const stripSlash = require('./strip-trailing-slashes.js')
+
+module.exports = (opt_, files, cb) => {
+  if (typeof opt_ === 'function') {
+    cb = opt_, files = null, opt_ = {}
+  } else if (Array.isArray(opt_)) {
+    files = opt_, opt_ = {}
+  }
+
+  if (typeof files === 'function') {
+    cb = files, files = null
+  }
+
+  if (!files) {
+    files = []
+  } else {
+    files = Array.from(files)
+  }
+
+  const opt = hlo(opt_)
+
+  if (opt.sync && typeof cb === 'function') {
+    throw new TypeError('callback not supported for sync tar functions')
+  }
+
+  if (!opt.file && typeof cb === 'function') {
+    throw new TypeError('callback only supported with file option')
+  }
+
+  if (files.length) {
+    filesFilter(opt, files)
+  }
+
+  return opt.file && opt.sync ? extractFileSync(opt)
+    : opt.file ? extractFile(opt, cb)
+    : opt.sync ? extractSync(opt)
+    : extract(opt)
+}
+
+// construct a filter that limits the file entries listed
+// include child entries if a dir is included
+const filesFilter = (opt, files) => {
+  const map = new Map(files.map(f => [stripSlash(f), true]))
+  const filter = opt.filter
+
+  const mapHas = (file, r) => {
+    const root = r || path.parse(file).root || '.'
+    const ret = file === root ? false
+      : map.has(file) ? map.get(file)
+      : mapHas(path.dirname(file), root)
+
+    map.set(file, ret)
+    return ret
+  }
+
+  opt.filter = filter
+    ? (file, entry) => filter(file, entry) && mapHas(stripSlash(file))
+    : file => mapHas(stripSlash(file))
+}
+
+const extractFileSync = opt => {
+  const u = new Unpack.Sync(opt)
+
+  const file = opt.file
+  const stat = fs.statSync(file)
+  // This trades a zero-byte read() syscall for a stat
+  // However, it will usually result in less memory allocation
+  const readSize = opt.maxReadSize || 16 * 1024 * 1024
+  const stream = new fsm.ReadStreamSync(file, {
+    readSize: readSize,
+    size: stat.size,
+  })
+  stream.pipe(u)
+}
+
+const extractFile = (opt, cb) => {
+  const u = new Unpack(opt)
+  const readSize = opt.maxReadSize || 16 * 1024 * 1024
+
+  const file = opt.file
+  const p = new Promise((resolve, reject) => {
+    u.on('error', reject)
+    u.on('close', resolve)
+
+    // This trades a zero-byte read() syscall for a stat
+    // However, it will usually result in less memory allocation
+    fs.stat(file, (er, stat) => {
+      if (er) {
+        reject(er)
+      } else {
+        const stream = new fsm.ReadStream(file, {
+          readSize: readSize,
+          size: stat.size,
+        })
+        stream.on('error', reject)
+        stream.pipe(u)
+      }
+    })
+  })
+  return cb ? p.then(cb, cb) : p
+}
+
+const extractSync = opt => new Unpack.Sync(opt)
+
+const extract = opt => new Unpack(opt)