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bpo-32056: Improve exceptions in aifc, wave and sunau. (GH-5951)

This commit is contained in:
Serhiy Storchaka 2018-03-18 09:55:53 +02:00 committed by GitHub
parent bc300ce205
commit 134cb01cda
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 150 additions and 7 deletions
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4
Lib/aifc.py
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@ -467,6 +467,10 @@ class Aifc_read:
self._nframes = _read_long(chunk)
self._sampwidth = (_read_short(chunk) + 7) // 8
self._framerate = int(_read_float(chunk))
if self._sampwidth <= 0:
raise Error('bad sample width')
if self._nchannels <= 0:
raise Error('bad # of channels')
self._framesize = self._nchannels * self._sampwidth
if self._aifc:
#DEBUG: SGI's soundeditor produces a bad size :-(

2
Lib/sunau.py
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@ -208,6 +208,8 @@ class Au_read:
raise Error('unknown encoding')
self._framerate = int(_read_u32(file))
self._nchannels = int(_read_u32(file))
if not self._nchannels:
raise Error('bad # of channels')
self._framesize = self._framesize * self._nchannels
if self._hdr_size > 24:
self._info = file.read(self._hdr_size - 24)

35
Lib/test/test_aifc.py
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@ -268,7 +268,8 @@ class AIFCLowLevelTest(unittest.TestCase):
def test_read_no_ssnd_chunk(self):
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 38, 0, 0, 0, 0, 0, 0)
b += b'COMM' + struct.pack('>LhlhhLL', 38, 1, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'NONE' + struct.pack('B', 14) + b'not compressed' + b'\x00'
with self.assertRaisesRegex(aifc.Error, 'COMM chunk and/or SSND chunk'
' missing'):
@ -276,13 +277,35 @@ class AIFCLowLevelTest(unittest.TestCase):
def test_read_wrong_compression_type(self):
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 23, 0, 0, 0, 0, 0, 0)
b += b'COMM' + struct.pack('>LhlhhLL', 23, 1, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'WRNG' + struct.pack('B', 0)
self.assertRaises(aifc.Error, aifc.open, io.BytesIO(b))
def test_read_wrong_number_of_channels(self):
for nchannels in 0, -1:
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 38, nchannels, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'NONE' + struct.pack('B', 14) + b'not compressed' + b'\x00'
b += b'SSND' + struct.pack('>L', 8) + b'\x00' * 8
with self.assertRaisesRegex(aifc.Error, 'bad # of channels'):
aifc.open(io.BytesIO(b))
def test_read_wrong_sample_width(self):
for sampwidth in 0, -1:
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 38, 1, 0, sampwidth,
0x4000 | 12, 11025<<18, 0)
b += b'NONE' + struct.pack('B', 14) + b'not compressed' + b'\x00'
b += b'SSND' + struct.pack('>L', 8) + b'\x00' * 8
with self.assertRaisesRegex(aifc.Error, 'bad sample width'):
aifc.open(io.BytesIO(b))
def test_read_wrong_marks(self):
b = b'FORM' + struct.pack('>L', 4) + b'AIFF'
b += b'COMM' + struct.pack('>LhlhhLL', 18, 0, 0, 0, 0, 0, 0)
b += b'COMM' + struct.pack('>LhlhhLL', 18, 1, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'SSND' + struct.pack('>L', 8) + b'\x00' * 8
b += b'MARK' + struct.pack('>LhB', 3, 1, 1)
with self.assertWarns(UserWarning) as cm:
@ -293,7 +316,8 @@ class AIFCLowLevelTest(unittest.TestCase):
def test_read_comm_kludge_compname_even(self):
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 18, 0, 0, 0, 0, 0, 0)
b += b'COMM' + struct.pack('>LhlhhLL', 18, 1, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'NONE' + struct.pack('B', 4) + b'even' + b'\x00'
b += b'SSND' + struct.pack('>L', 8) + b'\x00' * 8
with self.assertWarns(UserWarning) as cm:
@ -303,7 +327,8 @@ class AIFCLowLevelTest(unittest.TestCase):
def test_read_comm_kludge_compname_odd(self):
b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
b += b'COMM' + struct.pack('>LhlhhLL', 18, 0, 0, 0, 0, 0, 0)
b += b'COMM' + struct.pack('>LhlhhLL', 18, 1, 0, 8,
0x4000 | 12, 11025<<18, 0)
b += b'NONE' + struct.pack('B', 3) + b'odd'
b += b'SSND' + struct.pack('>L', 8) + b'\x00' * 8
with self.assertWarns(UserWarning) as cm:

37
Lib/test/test_sunau.py
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@ -1,6 +1,8 @@
import unittest
from test import audiotests
from audioop import byteswap
import io
import struct
import sys
import sunau
@ -121,5 +123,40 @@ class SunauMiscTests(audiotests.AudioMiscTests, unittest.TestCase):
module = sunau
class SunauLowLevelTest(unittest.TestCase):
def test_read_bad_magic_number(self):
b = b'SPA'
with self.assertRaises(EOFError):
sunau.open(io.BytesIO(b))
b = b'SPAM'
with self.assertRaisesRegex(sunau.Error, 'bad magic number'):
sunau.open(io.BytesIO(b))
def test_read_too_small_header(self):
b = struct.pack('>LLLLL', sunau.AUDIO_FILE_MAGIC, 20, 0,
sunau.AUDIO_FILE_ENCODING_LINEAR_8, 11025)
with self.assertRaisesRegex(sunau.Error, 'header size too small'):
sunau.open(io.BytesIO(b))
def test_read_too_large_header(self):
b = struct.pack('>LLLLLL', sunau.AUDIO_FILE_MAGIC, 124, 0,
sunau.AUDIO_FILE_ENCODING_LINEAR_8, 11025, 1)
b += b'\0' * 100
with self.assertRaisesRegex(sunau.Error, 'header size ridiculously large'):
sunau.open(io.BytesIO(b))
def test_read_wrong_encoding(self):
b = struct.pack('>LLLLLL', sunau.AUDIO_FILE_MAGIC, 24, 0, 0, 11025, 1)
with self.assertRaisesRegex(sunau.Error, r'encoding not \(yet\) supported'):
sunau.open(io.BytesIO(b))
def test_read_wrong_number_of_channels(self):
b = struct.pack('>LLLLLL', sunau.AUDIO_FILE_MAGIC, 24, 0,
sunau.AUDIO_FILE_ENCODING_LINEAR_8, 11025, 0)
with self.assertRaisesRegex(sunau.Error, 'bad # of channels'):
sunau.open(io.BytesIO(b))
if __name__ == "__main__":
unittest.main()

62
Lib/test/test_wave.py
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@ -2,6 +2,8 @@ import unittest
from test import audiotests
from test import support
from audioop import byteswap
import io
import struct
import sys
import wave
@ -111,5 +113,65 @@ class MiscTestCase(audiotests.AudioMiscTests, unittest.TestCase):
support.check__all__(self, wave, blacklist=blacklist)
class WaveLowLevelTest(unittest.TestCase):
def test_read_no_chunks(self):
b = b'SPAM'
with self.assertRaises(EOFError):
wave.open(io.BytesIO(b))
def test_read_no_riff_chunk(self):
b = b'SPAM' + struct.pack('<L', 0)
with self.assertRaisesRegex(wave.Error,
'file does not start with RIFF id'):
wave.open(io.BytesIO(b))
def test_read_not_wave(self):
b = b'RIFF' + struct.pack('<L', 4) + b'SPAM'
with self.assertRaisesRegex(wave.Error,
'not a WAVE file'):
wave.open(io.BytesIO(b))
def test_read_no_fmt_no_data_chunk(self):
b = b'RIFF' + struct.pack('<L', 4) + b'WAVE'
with self.assertRaisesRegex(wave.Error,
'fmt chunk and/or data chunk missing'):
wave.open(io.BytesIO(b))
def test_read_no_data_chunk(self):
b = b'RIFF' + struct.pack('<L', 28) + b'WAVE'
b += b'fmt ' + struct.pack('<LHHLLHH', 16, 1, 1, 11025, 11025, 1, 8)
with self.assertRaisesRegex(wave.Error,
'fmt chunk and/or data chunk missing'):
wave.open(io.BytesIO(b))
def test_read_no_fmt_chunk(self):
b = b'RIFF' + struct.pack('<L', 12) + b'WAVE'
b += b'data' + struct.pack('<L', 0)
with self.assertRaisesRegex(wave.Error, 'data chunk before fmt chunk'):
wave.open(io.BytesIO(b))
def test_read_wrong_form(self):
b = b'RIFF' + struct.pack('<L', 36) + b'WAVE'
b += b'fmt ' + struct.pack('<LHHLLHH', 16, 2, 1, 11025, 11025, 1, 1)
b += b'data' + struct.pack('<L', 0)
with self.assertRaisesRegex(wave.Error, 'unknown format: 2'):
wave.open(io.BytesIO(b))
def test_read_wrong_number_of_channels(self):
b = b'RIFF' + struct.pack('<L', 36) + b'WAVE'
b += b'fmt ' + struct.pack('<LHHLLHH', 16, 1, 0, 11025, 11025, 1, 8)
b += b'data' + struct.pack('<L', 0)
with self.assertRaisesRegex(wave.Error, 'bad # of channels'):
wave.open(io.BytesIO(b))
def test_read_wrong_sample_width(self):
b = b'RIFF' + struct.pack('<L', 36) + b'WAVE'
b += b'fmt ' + struct.pack('<LHHLLHH', 16, 1, 1, 11025, 11025, 1, 0)
b += b'data' + struct.pack('<L', 0)
with self.assertRaisesRegex(wave.Error, 'bad sample width'):
wave.open(io.BytesIO(b))
if __name__ == '__main__':
unittest.main()

14
Lib/wave.py
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@ -253,12 +253,22 @@ class Wave_read:
#
def _read_fmt_chunk(self, chunk):
wFormatTag, self._nchannels, self._framerate, dwAvgBytesPerSec, wBlockAlign = struct.unpack_from('<HHLLH', chunk.read(14))
try:
wFormatTag, self._nchannels, self._framerate, dwAvgBytesPerSec, wBlockAlign = struct.unpack_from('<HHLLH', chunk.read(14))
except struct.error:
raise EOFError from None
if wFormatTag == WAVE_FORMAT_PCM:
sampwidth = struct.unpack_from('<H', chunk.read(2))[0]
try:
sampwidth = struct.unpack_from('<H', chunk.read(2))[0]
except struct.error:
raise EOFError from None
self._sampwidth = (sampwidth + 7) // 8
if not self._sampwidth:
raise Error('bad sample width')
else:
raise Error('unknown format: %r' % (wFormatTag,))
if not self._nchannels:
raise Error('bad # of channels')
self._framesize = self._nchannels * self._sampwidth
self._comptype = 'NONE'
self._compname = 'not compressed'

3
Misc/NEWS.d/next/Library/2018-03-01-17-49-56.bpo-32056.IlpfgE.rst Normal file
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@ -0,0 +1,3 @@
Improved exceptions raised for invalid number of channels and sample width
when read an audio file in modules :mod:`aifc`, :mod:`wave` and
:mod:`sunau`.