CRC修复

type/PNG.py

@@ -149,6 +149,15 @@ class PNG:
                     data[height_begin: height_begin+4] = height.to_bytes(4, byteorder='big')
                     print(f'[*] 已将图片高度设置为{height}')
                     changed = True
+            
+            chunk_data = data[data_begin: data_begin+length]
+            if not PNG.test_ihdr_chunk(ctype + chunk_data, crc):
+                print('[x] 修复CRC校验码')
+                chunk = ctype + chunk_data
+                crc32 = binascii.crc32(chunk) & 0xffffffff
+                data[data_begin+length:data_begin+length+4] = crc32.to_bytes(4, byteorder='big')
+                changed = True
+                b = True
         return changed, data, width, height
     
     @staticmethod