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import struct
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try:
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import unittest2 as unittest
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except ImportError:
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import unittest
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import zstd
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ss = struct.Struct('=QQ')
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class TestBufferWithSegments(unittest.TestCase):
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def test_arguments(self):
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with self.assertRaises(TypeError):
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zstd.BufferWithSegments()
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with self.assertRaises(TypeError):
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zstd.BufferWithSegments(b'foo')
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# Segments data should be a multiple of 16.
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with self.assertRaisesRegexp(ValueError, 'segments array size is not a multiple of 16'):
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zstd.BufferWithSegments(b'foo', b'\x00\x00')
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def test_invalid_offset(self):
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with self.assertRaisesRegexp(ValueError, 'offset within segments array references memory'):
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zstd.BufferWithSegments(b'foo', ss.pack(0, 4))
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def test_invalid_getitem(self):
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b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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with self.assertRaisesRegexp(IndexError, 'offset must be non-negative'):
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test = b[-10]
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with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
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test = b[1]
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with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
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test = b[2]
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def test_single(self):
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b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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self.assertEqual(len(b), 1)
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self.assertEqual(b.size, 3)
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self.assertEqual(b.tobytes(), b'foo')
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self.assertEqual(len(b[0]), 3)
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self.assertEqual(b[0].offset, 0)
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self.assertEqual(b[0].tobytes(), b'foo')
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def test_multiple(self):
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b = zstd.BufferWithSegments(b'foofooxfooxy', b''.join([ss.pack(0, 3),
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ss.pack(3, 4),
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ss.pack(7, 5)]))
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self.assertEqual(len(b), 3)
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self.assertEqual(b.size, 12)
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self.assertEqual(b.tobytes(), b'foofooxfooxy')
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self.assertEqual(b[0].tobytes(), b'foo')
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self.assertEqual(b[1].tobytes(), b'foox')
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self.assertEqual(b[2].tobytes(), b'fooxy')
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class TestBufferWithSegmentsCollection(unittest.TestCase):
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def test_empty_constructor(self):
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with self.assertRaisesRegexp(ValueError, 'must pass at least 1 argument'):
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zstd.BufferWithSegmentsCollection()
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def test_argument_validation(self):
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with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
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zstd.BufferWithSegmentsCollection(None)
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with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
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zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'foo', ss.pack(0, 3)),
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None)
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with self.assertRaisesRegexp(ValueError, 'ZstdBufferWithSegments cannot be empty'):
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zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'', b''))
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def test_length(self):
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b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
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ss.pack(3, 3)]))
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c = zstd.BufferWithSegmentsCollection(b1)
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self.assertEqual(len(c), 1)
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self.assertEqual(c.size(), 3)
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c = zstd.BufferWithSegmentsCollection(b2)
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self.assertEqual(len(c), 2)
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self.assertEqual(c.size(), 6)
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c = zstd.BufferWithSegmentsCollection(b1, b2)
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self.assertEqual(len(c), 3)
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self.assertEqual(c.size(), 9)
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def test_getitem(self):
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b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
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b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
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ss.pack(3, 3)]))
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c = zstd.BufferWithSegmentsCollection(b1, b2)
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with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
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c[3]
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with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
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c[4]
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self.assertEqual(c[0].tobytes(), b'foo')
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self.assertEqual(c[1].tobytes(), b'bar')
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self.assertEqual(c[2].tobytes(), b'baz')
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