1.1 released, comes with damaged flag

libpme.py

@@ -3,34 +3,39 @@
 # Niles Rogoff 2016
 import zlib, copy
 class color_types(object):
-    GREYSCALE = 0
-    RGB = 2
-    PALETTE = 3
-    GREYSCALE_WITH_ALPHA = 4
-    RGB_WITH_ALPHA = 6
+	GREYSCALE = 0
+	RGB = 2
+	PALETTE = 3
+	GREYSCALE_WITH_ALPHA = 4
+	RGB_WITH_ALPHA = 6
 class PME(object):
+	def _assert(self, statement):
+		if not self._damaged:
+			assert(statement)
 	def _int(self, binary):
 		return int.from_bytes(binary, byteorder="big")
 	def _bytes(self, integer, length):
 		return integer.to_bytes(length, "big")
-	def __init__(self, filename=False):
+	def __init__(self, filename=False, damaged=False):
+		self._damaged = damaged
 		self._init = False
 		self._magic_number = b'\x89PNG\r\n\x1a\n'
 		self.filename = filename
 		self.chunks = []
 		if filename:
 			f = open(self.filename, "rb")
-			assert(f.read(8) == self._magic_number)
+			self._assert(f.read(8) == self._magic_number)
 			while True:
 				length = f.read(4)
 				label = f.read(4)
 				data = f.read(self._int(length))
 				crc = f.read(4)
-				self._verify_crc(label, data, crc)
+				if not self._damaged:
+					self._verify_crc(label, data, crc)
 				self.chunks.append([length, label, data, crc])
 				if label == b"IEND":
 					break
-			assert(self.chunks[0][1] == b"IHDR")
+			self._assert(self.chunks[0][1] == b"IHDR")
 			self.recalculate_properties()
 		else:
 			self.chunks = [

readme.md

@@ -128,3 +128,8 @@ In this example, we will draw a red sine wave on a new 100x100 file
 
 The output should look something like this:
 ![](http://i.imgur.com/vfa6lOR.png)
+
+## Changelog
+
+### 1.1
+Added the damaged argument to the constructor. If damaged is set to true, it will allow you to open potentially damaged png files, which maybe don't have IDAT as the first chunk, or have invalid CRCs

setup.py

@@ -1,7 +1,7 @@
 #from distutils.core import setup
 from setuptools import setup
 setup(name='libpme',
-      version='1.0',
+      version='1.1',
 	  description="PNG metadata editor library",
 	  author="Niles Rogoff",
 	  author_email="me@niles.xyz",