block value only affects heuristic blocks when -H is specified

src/binwalk/modules/entropy.py

@@ -17,6 +17,8 @@ class Entropy(Module):
 
 	COLORS = ['r', 'g', 'c', 'b', 'm']
 
+	DEFAULT_BLOCK_SIZE = 1024
+
 	TITLE = "Entropy"
 	ORDER = 8
 	
@@ -45,7 +47,7 @@ class Entropy(Module):
 			Kwarg(name='display_results', default=True),
 			Kwarg(name='do_plot', default=True),
 			Kwarg(name='show_legend', default=True),
-			Kwarg(name='block_size', default=1024),
+			Kwarg(name='block_size', default=0),
 	]
 
 	# Run this module last so that it can process all other module's results and overlay them on the entropy graph
@@ -75,8 +77,11 @@ class Entropy(Module):
 		if self.file_markers:
 			self.display_results = False
 
-		if self.config.block:
-			self.block_size = self.config.block
+		if not self.block_size:
+			if self.config.block:
+				self.block_size = self.config.block
+			else:
+				self.block_size = self.DEFAULT_BLOCK_SIZE
 
 	def run(self):
 		from pyqtgraph.Qt import QtGui

src/binwalk/modules/heuristics.py

@@ -83,6 +83,7 @@ class HeuristicCompressionAnalyzer(Module):
 	ENTROPY_TRIGGER = .90
 	MIN_BLOCK_SIZE = 4096
 	BLOCK_OFFSET = 1024
+	ENTROPY_BLOCK_SIZE = 1024
 
 	TITLE = "Heuristic Compression"
 
@@ -91,7 +92,7 @@ class HeuristicCompressionAnalyzer(Module):
 					   attribute='config'),
 			Dependency(name='Entropy',
 					   attribute='entropy',
-					   kwargs={'enabled' : True, 'do_plot' : False, 'display_results' : False}),
+					   kwargs={'enabled' : True, 'do_plot' : False, 'display_results' : False, 'block_size' : ENTROPY_BLOCK_SIZE}),
 	]
 	
 	{'config' : 'Configuration', 'entropy' : 'Entropy'}