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node_modules/minipass-sized/index.js

@@ -0,0 +1,67 @@
+const Minipass = require('minipass')
+
+class SizeError extends Error {
+  constructor (found, expect) {
+    super(`Bad data size: expected ${expect} bytes, but got ${found}`)
+    this.expect = expect
+    this.found = found
+    this.code = 'EBADSIZE'
+	  Error.captureStackTrace(this, this.constructor)
+  }
+  get name () {
+    return 'SizeError'
+  }
+}
+
+class MinipassSized extends Minipass {
+  constructor (options = {}) {
+    super(options)
+
+    if (options.objectMode)
+      throw new TypeError(`${
+        this.constructor.name
+      } streams only work with string and buffer data`)
+
+    this.found = 0
+    this.expect = options.size
+    if (typeof this.expect !== 'number' ||
+        this.expect > Number.MAX_SAFE_INTEGER ||
+        isNaN(this.expect) ||
+        this.expect < 0 ||
+        !isFinite(this.expect) ||
+        this.expect !== Math.floor(this.expect))
+      throw new Error('invalid expected size: ' + this.expect)
+  }
+
+  write (chunk, encoding, cb) {
+    const buffer = Buffer.isBuffer(chunk) ? chunk
+      : typeof chunk === 'string' ?
+        Buffer.from(chunk, typeof encoding === 'string' ? encoding : 'utf8')
+      : chunk
+
+    if (!Buffer.isBuffer(buffer)) {
+      this.emit('error', new TypeError(`${
+        this.constructor.name
+      } streams only work with string and buffer data`))
+      return false
+    }
+
+    this.found += buffer.length
+    if (this.found > this.expect)
+      this.emit('error', new SizeError(this.found, this.expect))
+
+    return super.write(chunk, encoding, cb)
+  }
+
+  emit (ev, ...data) {
+    if (ev === 'end') {
+      if (this.found !== this.expect)
+        this.emit('error', new SizeError(this.found, this.expect))
+    }
+    return super.emit(ev, ...data)
+  }
+}
+
+MinipassSized.SizeError = SizeError
+
+module.exports = MinipassSized