Code

Code/venv/lib/python3.13/site-packages/pyasn1_modules/pem.py

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+#
+# This file is part of pyasn1-modules software.
+#
+# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
+# License: http://snmplabs.com/pyasn1/license.html
+#
+import base64
+
+stSpam, stHam, stDump = 0, 1, 2
+
+
+# The markers parameters is in form ('start1', 'stop1'), ('start2', 'stop2')...
+# Return is (marker-index, substrate)
+def readPemBlocksFromFile(fileObj, *markers):
+    startMarkers = dict(map(lambda x: (x[1], x[0]),
+                            enumerate(map(lambda y: y[0], markers))))
+    stopMarkers = dict(map(lambda x: (x[1], x[0]),
+                           enumerate(map(lambda y: y[1], markers))))
+    idx = -1
+    substrate = ''
+    certLines = []
+    state = stSpam
+    while True:
+        certLine = fileObj.readline()
+        if not certLine:
+            break
+        certLine = certLine.strip()
+        if state == stSpam:
+            if certLine in startMarkers:
+                certLines = []
+                idx = startMarkers[certLine]
+                state = stHam
+                continue
+        if state == stHam:
+            if certLine in stopMarkers and stopMarkers[certLine] == idx:
+                state = stDump
+            else:
+                certLines.append(certLine)
+        if state == stDump:
+            substrate = ''.encode().join([base64.b64decode(x.encode()) for x in certLines])
+            break
+    return idx, substrate
+
+
+# Backward compatibility routine
+def readPemFromFile(fileObj,
+                    startMarker='-----BEGIN CERTIFICATE-----',
+                    endMarker='-----END CERTIFICATE-----'):
+    idx, substrate = readPemBlocksFromFile(fileObj, (startMarker, endMarker))
+    return substrate
+
+
+def readBase64fromText(text):
+    return base64.b64decode(text.encode())
+
+
+def readBase64FromFile(fileObj):
+    return readBase64fromText(fileObj.read())