Added check for the dyld magic.

Author: arandomdev

bin/dyldex

@@ -224,6 +224,11 @@ def main():
 	with open(args.dyld_path, "rb") as f:
 		dyldCtx = DyldContext(f)
 
+		# Check magic
+		if dyldCtx.header.magic[0:4] != b"dyld":
+			print("Cache's magic does not start with 'dyld', most likely given a file that's not a cache or the file is broken.")  # noqa
+			return
+
 		# enumerate images, create a map of paths and images
 		imageMap = {}
 		for imageData in dyldCtx.images:

bin/dyldex_all

@@ -254,6 +254,11 @@ def _main() -> None:
 	with open(args.dyld_path, "rb") as f:
 		dyldCtx = DyldContext(f)
 
+		# Check magic
+		if dyldCtx.header.magic[0:4] != b"dyld":
+			print("Cache's magic does not start with 'dyld', most likely given a file that's not a cache or the file is broken.")  # noqa
+			return
+
 		for image in dyldCtx.images:
 			imagePath = dyldCtx.readString(
 				image.pathFileOffset

setup.py

@@ -2,7 +2,7 @@
 
 setup(
 	name='dyldextractor',
-	version='2.0.3',
+	version='2.0.4',
 	description='Extract Binaries from Apple\'s Dyld Shared Cache',
 	long_description='file: README.md',
 	long_description_content_type='text/markdown',