[catapult] - Copy Telemetry's gsutilz over to third_party.

third_party/gsutil/third_party/pyasn1/pyasn1/codec/cer/decoder.py

Index: third_party/gsutil/third_party/pyasn1/pyasn1/codec/cer/decoder.py
diff --git a/third_party/gsutil/third_party/pyasn1/pyasn1/codec/cer/decoder.py b/third_party/gsutil/third_party/pyasn1/pyasn1/codec/cer/decoder.py
new file mode 100644
index 0000000000000000000000000000000000000000..9fd37c1347397f81a9ecb8d382dbac5f8dd69884
--- /dev/null
+++ b/third_party/gsutil/third_party/pyasn1/pyasn1/codec/cer/decoder.py
@@ -0,0 +1,35 @@
+# CER decoder
+from pyasn1.type import univ
+from pyasn1.codec.ber import decoder
+from pyasn1.compat.octets import oct2int
+from pyasn1 import error
+
+class BooleanDecoder(decoder.AbstractSimpleDecoder):
+    protoComponent = univ.Boolean(0)
+    def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
+                     state, decodeFun, substrateFun):
+        head, tail = substrate[:length], substrate[length:]
+        if not head:
+            raise error.PyAsn1Error('Empty substrate')
+        byte = oct2int(head[0])
+        # CER/DER specifies encoding of TRUE as 0xFF and FALSE as 0x0, while
+        # BER allows any non-zero value as TRUE; cf. sections 8.2.2. and 11.1 
+        # in http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
+        if byte == 0xff:
+            value = 1
+        elif byte == 0x00:
+            value = 0
+        else:
+            raise error.PyAsn1Error('Boolean CER violation: %s' % byte)
+        return self._createComponent(asn1Spec, tagSet, value), tail
+
+tagMap = decoder.tagMap.copy()
+tagMap.update({
+    univ.Boolean.tagSet: BooleanDecoder()
+    })
+
+typeMap = decoder.typeMap
+
+class Decoder(decoder.Decoder): pass
+
+decode = Decoder(tagMap, decoder.typeMap)