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# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.
# http://code.google.com/p/protobuf/
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Test for google.protobuf.internal.output_stream."""
__author__ = 'robinson@google.com (Will Robinson)'
import unittest
from google.protobuf import message
from google.protobuf.internal import output_stream
from google.protobuf.internal import wire_format
class OutputStreamTest(unittest.TestCase):
def setUp(self):
self.stream = output_stream.OutputStream()
def testAppendRawBytes(self):
# Empty string.
self.stream.AppendRawBytes('')
self.assertEqual('', self.stream.ToString())
# Nonempty string.
self.stream.AppendRawBytes('abc')
self.assertEqual('abc', self.stream.ToString())
# Ensure that we're actually appending.
self.stream.AppendRawBytes('def')
self.assertEqual('abcdef', self.stream.ToString())
def AppendNumericTestHelper(self, append_fn, values_and_strings):
"""For each (value, expected_string) pair in values_and_strings,
calls an OutputStream.Append*(value) method on an OutputStream and ensures
that the string written to that stream matches expected_string.
Args:
append_fn: Unbound OutputStream method that takes an integer or
long value as input.
values_and_strings: Iterable of (value, expected_string) pairs.
"""
for conversion in (int, long):
for value, string in values_and_strings:
stream = output_stream.OutputStream()
expected_string = ''
append_fn(stream, conversion(value))
expected_string += string
self.assertEqual(expected_string, stream.ToString())
def AppendOverflowTestHelper(self, append_fn, value):
"""Calls an OutputStream.Append*(value) method and asserts
that the method raises message.EncodeError.
Args:
append_fn: Unbound OutputStream method that takes an integer or
long value as input.
value: Value to pass to append_fn which should cause an
message.EncodeError.
"""
stream = output_stream.OutputStream()
self.assertRaises(message.EncodeError, append_fn, stream, value)
def testAppendLittleEndian32(self):
append_fn = output_stream.OutputStream.AppendLittleEndian32
values_and_expected_strings = [
(0, '\x00\x00\x00\x00'),
(1, '\x01\x00\x00\x00'),
((1 << 32) - 1, '\xff\xff\xff\xff'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, 1 << 32)
self.AppendOverflowTestHelper(append_fn, -1)
def testAppendLittleEndian64(self):
append_fn = output_stream.OutputStream.AppendLittleEndian64
values_and_expected_strings = [
(0, '\x00\x00\x00\x00\x00\x00\x00\x00'),
(1, '\x01\x00\x00\x00\x00\x00\x00\x00'),
((1 << 64) - 1, '\xff\xff\xff\xff\xff\xff\xff\xff'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, 1 << 64)
self.AppendOverflowTestHelper(append_fn, -1)
def testAppendVarint32(self):
append_fn = output_stream.OutputStream.AppendVarint32
values_and_expected_strings = [
(0, '\x00'),
(1, '\x01'),
(127, '\x7f'),
(128, '\x80\x01'),
(-1, '\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01'),
(wire_format.INT32_MAX, '\xff\xff\xff\xff\x07'),
(wire_format.INT32_MIN, '\x80\x80\x80\x80\xf8\xff\xff\xff\xff\x01'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, wire_format.INT32_MAX + 1)
self.AppendOverflowTestHelper(append_fn, wire_format.INT32_MIN - 1)
def testAppendVarUInt32(self):
append_fn = output_stream.OutputStream.AppendVarUInt32
values_and_expected_strings = [
(0, '\x00'),
(1, '\x01'),
(127, '\x7f'),
(128, '\x80\x01'),
(wire_format.UINT32_MAX, '\xff\xff\xff\xff\x0f'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, -1)
self.AppendOverflowTestHelper(append_fn, wire_format.UINT32_MAX + 1)
def testAppendVarint64(self):
append_fn = output_stream.OutputStream.AppendVarint64
values_and_expected_strings = [
(0, '\x00'),
(1, '\x01'),
(127, '\x7f'),
(128, '\x80\x01'),
(-1, '\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01'),
(wire_format.INT64_MAX, '\xff\xff\xff\xff\xff\xff\xff\xff\x7f'),
(wire_format.INT64_MIN, '\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, wire_format.INT64_MAX + 1)
self.AppendOverflowTestHelper(append_fn, wire_format.INT64_MIN - 1)
def testAppendVarUInt64(self):
append_fn = output_stream.OutputStream.AppendVarUInt64
values_and_expected_strings = [
(0, '\x00'),
(1, '\x01'),
(127, '\x7f'),
(128, '\x80\x01'),
(wire_format.UINT64_MAX, '\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01'),
]
self.AppendNumericTestHelper(append_fn, values_and_expected_strings)
self.AppendOverflowTestHelper(append_fn, -1)
self.AppendOverflowTestHelper(append_fn, wire_format.UINT64_MAX + 1)
if __name__ == '__main__':
unittest.main()
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