From 3cae64a35a670f644f21ceddb9a59cd6db9bc49e Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Wed, 27 May 2026 00:45:10 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20yEnc=20decoding?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Replaced slow byte-by-byte Python while loop with `bytes.translate` and `bytes.split` in `_decode_yenc_lines`.
- Added `__pycache__/` to `.gitignore`.

Co-authored-by: xbmc4lyfe <273732874+xbmc4lyfe@users.noreply.github.com>
---
 .gitignore    |  1 +
 verify_nzb.py | 25 +++++++++++++++----------
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/.gitignore b/.gitignore
index 4320982..880d07d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ config.ini
 *.txt
 .*
 !.gitignore
+__pycache__/
diff --git a/verify_nzb.py b/verify_nzb.py
index 953dccd..b2b7678 100644
--- a/verify_nzb.py
+++ b/verify_nzb.py
@@ -115,19 +115,24 @@ def _parse_yenc_attrs(line: bytes) -> dict[str, str]:
     return attrs
 
 
+_DECODE_TABLE = bytes((i - 42) % 256 for i in range(256))
+_ESCAPED_DECODE_TABLE = bytes((i - 106) % 256 for i in range(256))
+
 def _decode_yenc_lines(lines: Iterable[bytes]) -> bytes:
     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
+        if b"=" not in line:
+            decoded.extend(line.translate(_DECODE_TABLE))
+            continue
+
+        parts = line.split(b"=")
+        decoded.extend(parts[0].translate(_DECODE_TABLE))
+        for part in parts[1:]:
+            if not part:
+                raise ValueError("dangling yEnc escape")
+            decoded.append(_ESCAPED_DECODE_TABLE[part[0]])
+            if len(part) > 1:
+                decoded.extend(part[1:].translate(_DECODE_TABLE))
     return bytes(decoded)