From c5ed6bfe190e3e8aa84b25b1655de6dbe65b8b37 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Mon, 8 Jun 2026 00:35:38 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20optimize=20yEnc=20decoding?=
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- Replace manual byte-by-byte iteration with C-backed `bytes.find()` and `bytearray.translate()`
- Create precomputed translation table `_YENC_TRANS` for fast transformation

Co-authored-by: xbmc4lyfe <273732874+xbmc4lyfe@users.noreply.github.com>
---
 verify_nzb.py | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/verify_nzb.py b/verify_nzb.py
index 953dccd..0f730cb 100644
--- a/verify_nzb.py
+++ b/verify_nzb.py
@@ -115,20 +115,32 @@ def _parse_yenc_attrs(line: bytes) -> dict[str, str]:
     return attrs
 
 
+_YENC_TRANS = bytes((i - 42) % 256 for i in range(256))
+
+
 def _decode_yenc_lines(lines: Iterable[bytes]) -> bytes:
+    # ⚡ Bolt Optimization: Use C-backed `bytes.find()` and `translate()`
+    # instead of manual byte-by-byte iteration for significant speedup.
     decoded = bytearray()
     for line in lines:
-        index = 0
-        while index < len(line):
-            byte = line[index]
-            if byte == 61:
-                index += 1
-                if index >= len(line):
-                    raise ValueError("dangling yEnc escape")
-                byte = (line[index] - 64) % 256
-            decoded.append((byte - 42) % 256)
-            index += 1
-    return bytes(decoded)
+        pos = line.find(b"=")
+        if pos == -1:
+            decoded.extend(line)
+            continue
+
+        start = 0
+        line_len = len(line)
+        while pos != -1:
+            decoded.extend(line[start:pos])
+            pos += 1
+            if pos >= line_len:
+                raise ValueError("dangling yEnc escape")
+            decoded.append((line[pos] - 64) % 256)
+            start = pos + 1
+            pos = line.find(b"=", start)
+        decoded.extend(line[start:])
+
+    return bytes(decoded.translate(_YENC_TRANS))
 
 
 def validate_yenc_body(lines: Iterable[bytes | str]) -> YencValidationResult: