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test_element.py
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536 lines (512 loc) · 22.9 KB
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#pylint: disable=too-many-locals,no-self-use
#pylint: disable=too-many-public-methods,too-many-statements
"""
General element tests.
"""
from io import BytesIO
from .test import EbmlTest, UNK_ID
__all__ = ['ElementTest']
class ElementTest(EbmlTest):
"General element tests."
def check_valid_total_size_le(self, elt, goal, header, data):
#pylint: disable=too-many-arguments
"Test case for valid_total_size_le()."
solution = []
size = elt.valid_total_size_le(goal, solution)
self.assertEqual(size, solution[0] + solution[1])
self.assertEqual(solution, [header, data])
tmp_header = elt.header.copy()
tmp_header.size = data
self.assertTrue(tmp_header.numbytes_min <= header and
tmp_header.numbytes_max >= header)
self.assertTrue(elt.valid_data_size(data))
def reset_track_entry(self, ebmlf):
"Re-read the track entry element only."
elt = self.track_entry_elt(ebmlf)
start = elt.pos_relative
parent = elt.parent
parent.remove_child(elt)
return parent.read_element(ebmlf.stream, start)
def test_1_resizing(self):
"Test element minimum & maximum size, and resizing."
from ebml import MAX_DATA_SIZE
from ebml.element import ElementUnsupported, ElementVoid, ElementMaster
from ebml.tags import Tag, MATROSKA_TAGS
from ebml.atomic import ElementRaw, ElementUnsigned, ElementBoolean, \
ElementFloat, ElementString, ElementDate, ElementID
# ElementUnsupported: Rigid data size
elt = ElementUnsupported.new(UNK_ID, size=1234)
self.assertEqual(elt.size, 1234)
self.assertEqual(elt.header_size, 6)
self.assertEqual(elt.min_data_size(), 1234)
self.assertEqual(elt.max_data_size(), 1234)
self.assertEqual(elt.min_total_size(), 1234 + 4 + 2)
self.assertEqual(elt.max_total_size(), 1234 + 4 + 8)
self.assertEqual(elt.valid_data_size_le(1235), 1234)
self.assertEqual(elt.valid_data_size_le(1233), None)
self.assertRaises(ValueError, elt.resize, 1233)
self.assertRaises(ValueError, elt.resize, 1235)
self.assertEqual(elt.valid_total_size_le(1234 + 4 + 1), None)
for i in range(2, 9):
self.check_valid_total_size_le(elt, 1234 + 4 + i, 4 + i, 1234)
self.assertEqual(elt.valid_total_size_le(1234 + 4 + 9),
1234 + 4 + 8)
elt.resize_total(1234 + 4 + 8) # Grow header
self.assertEqual(elt.total_size, 1234 + 4 + 8)
self.assertEqual(elt.header_size, 12)
self.assertEqual(elt.size, 1234)
elt.resize_total(1234 + 4 + 2) # Shrink header
self.assertEqual(elt.total_size, 1234 + 4 + 2)
self.assertEqual(elt.header_size, 6)
self.assertEqual(elt.size, 1234)
self.assertRaises(ValueError, elt.resize_total, 1234 + 4 + 1)
self.assertRaises(ValueError, elt.resize_total, 1234 + 4 + 9)
# ElementVoid: Flexible data size
elt = ElementVoid.of_size(2)
self.assertEqual(elt.min_data_size(), 0)
self.assertEqual(elt.max_data_size(), MAX_DATA_SIZE)
self.assertEqual(elt.min_total_size(), 2)
self.assertEqual(elt.max_total_size(), MAX_DATA_SIZE + 9)
self.assertEqual(elt.valid_data_size_le(1000), 1000)
elt.resize(MAX_DATA_SIZE)
self.assertEqual(elt.size, MAX_DATA_SIZE)
self.assertEqual(elt.header_size, 9)
self.check_valid_total_size_le(elt, 10, 9, 1)
for i in reversed(range(2, 10)):
self.check_valid_total_size_le(elt, i, i, 0)
self.assertEqual(elt.valid_total_size_le(1), None)
# Shrink
elt.resize(10)
self.assertEqual(elt.size, 10)
self.assertEqual(elt.header_size, 9)
elt.resize_total(15) # Shrink data first
self.assertEqual(elt.size, 6)
self.assertEqual(elt.header_size, 9)
elt.resize_total(5) # Then shrink header
self.assertEqual(elt.size, 0)
self.assertEqual(elt.header_size, 5)
# Grow
elt.resize_total(100)
self.assertEqual(elt.size, 95) # Grow data
self.assertEqual(elt.header_size, 5)
# Min data size with data_size_min
elt.resize(5)
elt.data_size_min = 100
self.assertEqual(elt.min_data_size(), 5)
self.assertEqual(elt.valid_data_size_le(20), 20)
self.assertEqual(elt.valid_data_size_le(4), None)
elt.resize(200)
self.assertEqual(elt.min_data_size(), 100)
self.assertEqual(elt.valid_data_size_le(100), 100)
self.assertEqual(elt.valid_data_size_le(99), None)
# Check boundary cases in resize_total()
elt = ElementVoid.of_size(2)
for i in range(1, 9):
size = (1<<(i*7)) - 2 + 1 + i
elt.resize_total(size)
self.assertEqual(elt.total_size, size)
self.assertEqual(elt.header_size, 1+i)
if i != 8:
size += 1
elt.resize_total(size)
self.assertEqual(elt.total_size, size)
self.assertEqual(elt.header_size, 2+i)
# Container data size
elt = self.track_entry_elt(self.read_file_data())
# Already encoded in minimal size
self.assertEqual(elt.min_data_size(), elt.size)
self.assertEqual(elt.min_total_size(), elt.total_size)
self.assertEqual(elt.max_data_size(), MAX_DATA_SIZE)
self.assertEqual(elt.max_total_size(), MAX_DATA_SIZE + 9)
self.assertEqual(elt.valid_data_size_le(elt.size), elt.size)
self.assertEqual(elt.valid_data_size_le(elt.size-1), None)
self.assertEqual(elt.valid_data_size_le(elt.size-1), None)
self.assertEqual(elt.valid_data_size_le(elt.size+2), elt.size+2)
# No room for a size-1 Void
self.assertEqual(elt.valid_data_size_le(elt.size+1), elt.size)
# Compactable child (orig data size == 1)
elt[-1].resize(8)
elt.resize(elt.end_last_child)
self.assertEqual(elt.min_data_size(), elt.size-7)
self.assertEqual(elt.min_total_size(), elt.total_size-7)
# Replace element with Void
elt6 = elt[6]
pos = elt[6].pos_relative
size = elt[6].total_size
elt.remove_child(6)
ElementVoid.of_size(size, elt, pos)
elt.check_consistency()
self.assertEqual(elt.min_data_size(), elt.size - size - 7)
self.assertEqual(elt.min_total_size(), elt.total_size - size - 7)
# More testing
elt = elt6[0][0] # ContentCompression, one child
# elt[0]: ContentCompAlgo, size (2+1)+1
elt[0].resize(8)
elt.resize(11)
self.assertEqual(elt.valid_data_size_le(12), 12)
self.assertEqual(elt.valid_data_size_le(10), 10)
# No room for a size-1 Void
self.assertEqual(elt.valid_data_size_le(5), 4)
self.assertEqual(elt.valid_data_size_le(3), None)
# With data_size_min
elt.data_size_min = 5
self.assertEqual(elt.min_data_size(), 6)
self.assertEqual(elt.valid_data_size_le(5), None)
self.assertEqual(elt.valid_data_size_le(6), 6)
self.assertEqual(elt.valid_data_size_le(7), 7) # (!)
self.assertEqual(elt.valid_data_size_le(8), 8)
elt.data_size_min = 4
self.assertEqual(elt.min_data_size(), 4)
self.assertEqual(elt.valid_data_size_le(4), 4)
self.assertEqual(elt.valid_data_size_le(5), 4)
self.assertEqual(elt.valid_data_size_le(6), 6)
elt.data_size_min = 3
self.assertEqual(elt.min_data_size(), 4)
self.assertEqual(elt.valid_data_size_le(4), 4)
elt.data_size_min = 7
self.assertEqual(elt.min_data_size(), 7)
self.assertEqual(elt.valid_data_size_le(6), None)
self.assertEqual(elt.valid_data_size_le(7), 7)
self.assertEqual(elt.valid_data_size_le(8), 8)
self.assertEqual(elt.valid_data_size_le(9), 9)
# Atomics
# Raw
elt = ElementRaw.new_with_value(UNK_ID, b'abcd')
self.assertEqual(elt.min_data_size(), 4)
self.assertEqual(elt.max_data_size(), 4)
self.assertEqual(elt.valid_data_size_le(4), 4)
self.assertEqual(elt.valid_data_size_le(3), None)
elt.data_size_min = 5
self.assertEqual(elt.min_data_size(), 4)
# Unsigned
elt = ElementUnsigned.new_with_value(UNK_ID, 1000)
self.assertEqual(elt.size, 4)
self.assertEqual(elt.header_size, 5)
self.assertEqual(elt.min_data_size(), 2)
self.assertEqual(elt.max_data_size(), 8)
self.assertEqual(elt.valid_data_size_le(1), None)
self.assertEqual(elt.valid_data_size_le(3), 3)
self.assertEqual(elt.valid_data_size_le(5), 5)
self.assertEqual(elt.valid_data_size_le(9), 8)
elt.resize_total(11) # Grow data
self.assertEqual(elt.size, 6)
self.assertEqual(elt.header_size, 5)
elt.resize_total(15) # Grow header
self.assertEqual(elt.size, 8)
self.assertEqual(elt.header_size, 7)
self.assertRaises(ValueError, elt.resize_total, 12 + 8 + 1)
elt.resize_total(11) # Shrink data
self.assertEqual(elt.size, 4)
self.assertEqual(elt.header_size, 7)
elt.resize_total(7) # Shrink header
self.assertEqual(elt.size, 2)
self.assertEqual(elt.header_size, 5)
self.assertRaises(ValueError, elt.resize_total, 6)
elt = ElementUnsigned.new_with_value(UNK_ID, 1000)
elt.resize(2)
elt.data_size_min = 4
self.assertEqual(elt.min_data_size(), 2)
self.assertEqual(elt.valid_data_size_le(4), 4)
elt.resize(3)
self.assertEqual(elt.min_data_size(), 3)
self.assertEqual(elt.valid_data_size_le(4), 4)
elt.resize(4)
self.assertEqual(elt.min_data_size(), 4)
self.assertEqual(elt.valid_data_size_le(4), 4)
self.assertEqual(elt.valid_data_size_le(3), None)
elt.resize(5)
self.assertEqual(elt.min_data_size(), 4)
elt.value = 0x0101010101
self.assertEqual(elt.min_data_size(), 5)
elt.data_size_min = 8
self.assertEqual(elt.min_data_size(), 5)
elt.resize(8)
self.assertEqual(elt.min_data_size(), 8)
elt.data_size_min = 9 # invalid
self.assertEqual(elt.min_data_size(), 8)
self.assertEqual(elt.valid_data_size_le(9), 8)
# Boolean
elt = ElementBoolean.new_with_value(UNK_ID, True)
self.assertEqual(elt.min_data_size(), 1)
self.assertEqual(elt.max_data_size(), 8)
# Signed, Enum, BitField: same
# Float
elt = ElementFloat.new_with_value(UNK_ID, 0.0)
self.assertEqual(elt.min_data_size(), 4)
self.assertEqual(elt.max_data_size(), 8)
self.assertEqual(elt.valid_data_size_le(3), None)
self.assertEqual(elt.valid_data_size_le(5), 4)
self.assertEqual(elt.valid_data_size_le(7), 4)
self.assertEqual(elt.valid_data_size_le(8), 8)
self.assertEqual(elt.valid_data_size_le(9), 8)
elt.resize(8)
self.assertEqual(elt.min_data_size(), 8)
self.assertEqual(elt.max_data_size(), 8)
# String
elt = ElementString.new_with_value(UNK_ID, 'abcdefgh')
self.assertEqual(elt.min_data_size(), 8)
self.assertEqual(elt.max_data_size(), MAX_DATA_SIZE)
self.assertEqual(elt.valid_data_size_le(9), 9)
elt.resize_total(100)
self.assertEqual(elt.value, 'abcdefgh')
self.assertEqual(elt.total_size, 100)
self.assertEqual(elt.header_size, 5)
# Date
elt = ElementDate.new_with_value(UNK_ID)
self.assertEqual(elt.min_data_size(), 8)
self.assertEqual(elt.max_data_size(), 8)
self.assertEqual(elt.valid_data_size_le(7), None)
self.assertEqual(elt.valid_data_size_le(9), 8)
# ID
elt = ElementID.new_with_value(UNK_ID, 0x012233)
self.assertEqual(elt.min_data_size(), 3)
self.assertEqual(elt.max_data_size(), 3)
self.assertEqual(elt.valid_data_size_le(7), 3)
# Test min_header_size()
elt = ElementVoid.of_size(0x010101)
elt.header_size_min = 5
self.assertEqual(elt.min_header_size(), 4)
self.assertEqual(elt.min_header_size(0x01010101), 5)
self.assertEqual(elt.min_header_size(0x0101010101), 6)
self.assertEqual(elt.min_header_size(0x010101010101), 7)
# Grow header
elt.resize(0x0101010101)
elt.resize(1)
# Refuse to shrink header
self.assertEqual(elt.min_header_size(), 6)
# Put valid_total_size_le() through its paces
elt = ElementUnsigned.new_with_value(UNK_ID, 1000)
# Resize data
for i in range(2, 9):
self.check_valid_total_size_le(elt, 5 + i, 5, i)
# Grow header
for i in range(2, 9):
self.check_valid_total_size_le(elt, 4 + i + 8, 4 + i, 8)
self.check_valid_total_size_le(elt, 21, 4 + 8, 8)
# Shrinkable header
# Resize data
elt.header.numbytes = 10
for i in range(2, 9):
self.check_valid_total_size_le(elt, 10+i, 10, i)
self.check_valid_total_size_le(elt, 19, 11, 8)
self.check_valid_total_size_le(elt, 20, 12, 8)
self.check_valid_total_size_le(elt, 21, 12, 8)
# Resize header because data is at minimum size
for i in range(5, 11):
self.check_valid_total_size_le(elt, i + 2, i, 2)
# Prefer resizing data
self.check_valid_total_size_le(elt, 11 + 2, 10, 3)
self.check_valid_total_size_le(elt, 12 + 2, 10, 4)
self.check_valid_total_size_le(elt, 13 + 2, 10, 5)
# Funny allowed sizes
elt = ElementFloat.new_with_value(UNK_ID, 1.0)
# Resize header because 7 isn't a valid data size
self.check_valid_total_size_le(elt, 12, 8, 4)
# Prefer resizing data
self.check_valid_total_size_le(elt, 13, 5, 8)
# Prefer smaller header size: 10 + 4 also works
self.check_valid_total_size_le(elt, 14, 6, 8)
# Test minimum header and data size on element creation
tag = Tag(UNK_ID, 'TestTag', 'ElementMaster', None, False,
False, True, 1, 1, header_size_min=4, data_size_min=501)
MATROSKA_TAGS.insert(tag)
elt = ElementMaster.new('TestTag')
self.assertEqual(elt.header_size, 8)
self.assertEqual(elt.size, 501)
elt = ElementMaster.new('TestTag', size=0x0122334455)
self.assertEqual(elt.header_size, 9)
tag.header_size_min = 9
elt = ElementMaster.new('TestTag', size=0x0122334455)
self.assertEqual(elt.header_size, 12)
tag = Tag(UNK_ID, 'TestTag', 'ElementUnsigned', None, False,
False, True, 1, 1, header_size_min=4, data_size_min=5)
MATROSKA_TAGS.insert(tag)
elt = ElementUnsigned.new_with_value('TestTag', 1234)
self.assertEqual(elt.header_size, 8)
self.assertEqual(elt.size, 5)
tag.data_size_min = 3
elt = ElementUnsigned.new_with_value('TestTag', 1234)
self.assertEqual(elt.size, 4)
tag.data_size_min = 9
elt = ElementUnsigned.new_with_value('TestTag', 1234)
self.assertEqual(elt.size, 8)
tag = Tag(UNK_ID, 'TestTag', 'ElementFloat', None, False,
False, True, 1, 1, header_size_min=4, data_size_min=5)
MATROSKA_TAGS.insert(tag)
elt = ElementFloat.new_with_value('TestTag', 1234.0)
self.assertEqual(elt.size, 8)
tag.data_size_min = 3
elt = ElementFloat.new_with_value('TestTag', 1234.0)
self.assertEqual(elt.size, 4)
tag = Tag(UNK_ID, 'TestTag', 'ElementString', None, False,
False, True, 1, 1, header_size_min=5, data_size_min=50)
MATROSKA_TAGS.insert(tag)
elt = ElementString.new_with_value('TestTag', 'test string')
self.assertEqual(elt.size, 50)
MATROSKA_TAGS.remove(UNK_ID)
def test_2_dirty(self):
"Test whether the dirty property works."
from ebml.element import Element
from ebml.atomic import ElementRaw
ebmlf = self.read_file_data()
elts = self.track_entry_elt(ebmlf)
self.assertFalse(elts.dirty)
for elt in elts:
self.assertFalse(elt.dirty)
# All the ways to make an element dirty:
elts[0].value = 5 # Changed value
self.assertTrue(elts[0].dirty)
self.assertTrue(elts.dirty) # Child is dirty
elt = elts[1]
elts.move_child(elt, 71) # Moved
self.assertTrue(elt.dirty)
elts[2].resize(2) # Size changed
self.assertTrue(elts[2].dirty)
elts[3].dirty = True # Forced dirty
self.assertTrue(elts[3].dirty)
elt = ebmlf[1][1] # Void
old_size = elt.total_size
elt.header.numbytes = 3
elt.resize(old_size - 3)
self.assertTrue(elt.dirty) # Header changed size
ebmlf = self.read_file_data()
ebmlf[1].dirty = 'recurse' # Recursively forced dirty
elts = self.track_entry_elt(ebmlf)
self.assertTrue(elts.dirty)
for elt in elts:
self.assertTrue(elt.dirty)
# Created programatically
elt = ElementRaw.new_with_value(UNK_ID, parent=elts)
self.assertTrue(elt.dirty)
# Test that only dirty elements are written.
ebmlf = self.read_file_data()
elts = self.track_entry_elt(ebmlf)
stream2 = BytesIO(b'\x00' * len(self.file_data))
ebmlf.write(stream2) # Should do nothing
self.assertEqual(sum(stream2.getvalue()), 0)
elt = elts[0]
elt.dirty = True
ebmlf.write(stream2, seekfirst=True)
self.assertEqual(elt.read_raw(ebmlf.stream), elt.read_raw(stream2))
# Only the parents' headers should've been written
data = stream2.getvalue()
parent = elt
ancestors = []
while isinstance(parent, Element):
ancestors.append(parent)
parent = parent.parent
ancestors.reverse()
for i in range(1, len(ancestors)):
self.assertEqual(sum(data[ancestors[i-1].pos_data_absolute:
ancestors[i].pos_absolute]), 0)
self.assertEqual(sum(data[elt.pos_end_absolute:]), 0)
self.assertFalse(elt.dirty)
def test_3_consistency(self):
"Test consistency checks."
from ebml import Inconsistent
from ebml.element import ElementVoid, ElementPlaceholder
from ebml.atomic import ElementUnsigned
ebmlf = self.read_file_data()
ebmlf.check_consistency()
# overlap
elts = self.track_entry_elt(ebmlf)
elts[0].resize(2)
self.assertRaisesRegex(Inconsistent, 'Overlapping children',
ebmlf.check_consistency)
# blank at beginning
elts = self.reset_track_entry(ebmlf)
elts.remove_child(0)
self.assertRaisesRegex(Inconsistent, "Blank space at beginning",
elts.check_consistency)
# blank in middle
elts = self.reset_track_entry(ebmlf)
elts.remove_child(4)
self.assertRaisesRegex(Inconsistent, "Empty space between children",
elts.check_consistency)
# blank at end
elts = self.reset_track_entry(ebmlf)
elts.remove_child(-1)
self.assertRaisesRegex(Inconsistent, "ends before parent",
elts.check_consistency)
# overflow at end
elts = self.reset_track_entry(ebmlf)
elts[-1].resize(2)
self.assertRaisesRegex(Inconsistent, "ends after parent",
elts.check_consistency)
# empty but size > 0
elts = self.reset_track_entry(ebmlf)
while len(elts):
elts.remove_child(0)
self.assertRaisesRegex(Inconsistent,
"Empty Master Element",
elts.check_consistency)
# Impermissible level-0
self.reset_track_entry(ebmlf)
# ebmlf = self.read_file_data()
ebmlf.add_child(ElementUnsigned.new_with_value('EBMLVersion'))
self.assertRaisesRegex(Inconsistent, "Impermissible level-0 child",
ebmlf.check_consistency)
ebmlf.remove_child(-1)
# Missing required level-0
ebmlf.remove_child(1)
self.assertRaisesRegex(Inconsistent, "Mandatory level-0 element",
ebmlf.check_consistency)
# Version too low
ebmlf = self.read_file_data()
ebmlf[0].doc_type_version = 5
self.assertRaisesRegex(Inconsistent, "with EBML header Element",
ebmlf.check_consistency)
# Missing parent
elt = ElementUnsigned.new_with_value('EBMLVersion')
self.assertRaisesRegex(Inconsistent, "No parent element",
elt.check_consistency)
# Impermissible child
elts = self.reset_track_entry(ebmlf)
elts.remove_child(0)
ElementUnsigned.new_with_value('Position', 1, elts, 0)
elts[0].resize(1)
self.assertRaisesRegex(Inconsistent, "Impermissible child",
elts.check_consistency)
# Missing required child
elts = self.reset_track_entry(ebmlf)
size = elts[0].total_size
elts.remove_child(0)
ElementVoid.of_size(size, elts, 0)
self.assertRaisesRegex(Inconsistent, "Mandatory child",
elts.check_consistency)
# Multiple instances of unique child
elts = self.reset_track_entry(ebmlf)
elts.add_child(ElementUnsigned.new_with_value('TrackUID', 1))
elts.resize(elts.size + elts[-1].total_size)
self.assertRaisesRegex(Inconsistent, "Multiple instances of unique",
elts.check_consistency)
# Zero raw value
ebmlf = self.read_file_data()
seg = ebmlf[1]
info = seg[3]
uid = info[6]
uid.value = b'\x00' * len(uid.value)
self.assertRaisesRegex(Inconsistent, "Zero Raw value",
ebmlf.check_consistency)
# Unsigned too small
elts = self.reset_track_entry(ebmlf)
elts[0].value = 0
self.assertRaisesRegex(Inconsistent, "< min value",
elts.check_consistency)
# Unsigned too large
elts = self.reset_track_entry(ebmlf)
elts[2].value = 255
self.assertRaisesRegex(Inconsistent, "> max value",
elts.check_consistency)
# Float too small
audio = ebmlf[1][4][1][-1]
audio[0].value = 0.0 # SamplingFrequency
self.assertRaisesRegex(Inconsistent, "<= min value",
audio.check_consistency)
# Placeholder moved
elt = ElementPlaceholder.of_size('LibInternal', 10, ebmlf,
seg.pos_end_relative)
elt.check_consistency()
ebmlf.move_child(elt, seg.pos_end_relative + 10)
self.assertRaisesRegex(Inconsistent, "Dirty ElementPlaceholder",
elt.check_consistency)