Created a first draft of this action. (#14)

Reviewed-on: #14
Co-authored-by: Philipp Horstenkamp <philipp@horstenkamp.de>
Co-committed-by: Philipp Horstenkamp <philipp@horstenkamp.de>

node_modules/@fastify/busboy/lib/utils/decodeText.js

@@ -0,0 +1,114 @@
+'use strict'
+
+// Node has always utf-8
+const utf8Decoder = new TextDecoder('utf-8')
+const textDecoders = new Map([
+  ['utf-8', utf8Decoder],
+  ['utf8', utf8Decoder]
+])
+
+function getDecoder (charset) {
+  let lc
+  while (true) {
+    switch (charset) {
+      case 'utf-8':
+      case 'utf8':
+        return decoders.utf8
+      case 'latin1':
+      case 'ascii': // TODO: Make these a separate, strict decoder?
+      case 'us-ascii':
+      case 'iso-8859-1':
+      case 'iso8859-1':
+      case 'iso88591':
+      case 'iso_8859-1':
+      case 'windows-1252':
+      case 'iso_8859-1:1987':
+      case 'cp1252':
+      case 'x-cp1252':
+        return decoders.latin1
+      case 'utf16le':
+      case 'utf-16le':
+      case 'ucs2':
+      case 'ucs-2':
+        return decoders.utf16le
+      case 'base64':
+        return decoders.base64
+      default:
+        if (lc === undefined) {
+          lc = true
+          charset = charset.toLowerCase()
+          continue
+        }
+        return decoders.other.bind(charset)
+    }
+  }
+}
+
+const decoders = {
+  utf8: (data, sourceEncoding) => {
+    if (data.length === 0) {
+      return ''
+    }
+    if (typeof data === 'string') {
+      data = Buffer.from(data, sourceEncoding)
+    }
+    return data.utf8Slice(0, data.length)
+  },
+
+  latin1: (data, sourceEncoding) => {
+    if (data.length === 0) {
+      return ''
+    }
+    if (typeof data === 'string') {
+      return data
+    }
+    return data.latin1Slice(0, data.length)
+  },
+
+  utf16le: (data, sourceEncoding) => {
+    if (data.length === 0) {
+      return ''
+    }
+    if (typeof data === 'string') {
+      data = Buffer.from(data, sourceEncoding)
+    }
+    return data.ucs2Slice(0, data.length)
+  },
+
+  base64: (data, sourceEncoding) => {
+    if (data.length === 0) {
+      return ''
+    }
+    if (typeof data === 'string') {
+      data = Buffer.from(data, sourceEncoding)
+    }
+    return data.base64Slice(0, data.length)
+  },
+
+  other: (data, sourceEncoding) => {
+    if (data.length === 0) {
+      return ''
+    }
+    if (typeof data === 'string') {
+      data = Buffer.from(data, sourceEncoding)
+    }
+
+    if (textDecoders.has(this.toString())) {
+      try {
+        return textDecoders.get(this).decode(data)
+      } catch (e) { }
+    }
+    return typeof data === 'string'
+      ? data
+      : data.toString()
+  }
+}
+
+function decodeText (text, sourceEncoding, destEncoding) {
+  if (text) {
+    return getDecoder(destEncoding)(text, sourceEncoding)
+  }
+  return text
+}
+
+module.exports = decodeText