Complete Email Sortierer implementation with Appwrite and Stripe integration

server/node_modules/@exodus/bytes/fallback/encoding.util.js

@@ -0,0 +1,34 @@
+export function unfinishedBytes(u, len, enc) {
+  switch (enc) {
+    case 'utf-8': {
+      // 0-3
+      let p = 0
+      while (p < 2 && p < len && (u[len - p - 1] & 0xc0) === 0x80) p++ // go back 0-2 trailing bytes
+      if (p === len) return 0 // no space for lead
+      const l = u[len - p - 1]
+      if (l < 0xc2 || l > 0xf4) return 0 // not a lead
+      if (p === 0) return 1 // nothing to recheck, we have only lead, return it. 2-byte must return here
+      if (l < 0xe0 || (l < 0xf0 && p >= 2)) return 0 // 2-byte, or 3-byte or less and we already have 2 trailing
+      const lower = l === 0xf0 ? 0x90 : l === 0xe0 ? 0xa0 : 0x80
+      const upper = l === 0xf4 ? 0x8f : l === 0xed ? 0x9f : 0xbf
+      const n = u[len - p]
+      return n >= lower && n <= upper ? p + 1 : 0
+    }
+
+    case 'utf-16le':
+    case 'utf-16be': {
+      // 0-3
+      let p = 0
+      if (len % 2 !== 0) p++ // uneven bytes
+      const l = len - p - 1
+      if (len - p >= 2) {
+        const last = enc === 'utf-16le' ? (u[l] << 8) ^ u[l - 1] : (u[l - 1] << 8) ^ u[l]
+        if (last >= 0xd8_00 && last < 0xdc_00) p += 2 // lone lead
+      }
+
+      return p
+    }
+  }
+
+  throw new Error('Unsupported encoding')
+}