Fix ahupp#190

Author: ahupp

magic.py

@@ -65,6 +65,15 @@ def __init__(self, mime=False, magic_file=None, mime_encoding=False,
 
         magic_load(self.cookie, magic_file)
 
+
+        # For https://github.com/ahupp/python-magic/issues/190
+        # libmagic has fixed internal limits that some files exceed, causing 
+        # an error.  We can avoid this (at least for the sample file given) 
+        # by bumping the limit up.  It's not clear if this is a general solution
+        # or whether other internal limits should be increased, but given 
+        # the lack of other reports I'll assume this is rare.
+        self.setparam(MAGIC_PARAM_NAME_MAX, 64)
+
     def from_buffer(self, buf):
         """
         Identify the contents of `buf`

test/run.sh

@@ -7,7 +7,7 @@ export LC_ALL=en_US.UTF-8
 THISDIR=`dirname $0`
 export PYTHONPATH=${THISDIR}/..
 
-PYTHONS="python2.7 python3.5"
+PYTHONS="python2.7 python3.5 python3.7"
 
 for pyver in $PYTHONS; do
     if which $pyver > /dev/null; then

test/test.py

@@ -148,5 +148,10 @@ def test_getparam(self):
         m.setparam(magic.MAGIC_PARAM_INDIR_MAX, 1)
         self.assertEqual(m.getparam(magic.MAGIC_PARAM_INDIR_MAX), 1)
 
+    def test_name_count(self):
+        m = magic.Magic()
+        with open('testdata/python-3.7.2-python-magic-0.4.15.jpg', 'rb') as f:
+            m.from_buffer(f.read())
+
 if __name__ == '__main__':
     unittest.main()