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Issue #13589: Fix some serialization primitives in the aifc module.

Browse source 
Patch by Oleg Plakhotnyuk.
This commit is contained in:
Antoine Pitrou 2012-01-17 17:13:04 +01:00
parent c77bb65deb
commit 03757ec4a5
4 changed files with 71 additions and 18 deletions
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48
Lib/aifc.py
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@ -162,6 +162,12 @@ def _read_short(file):
except struct.error:
raise EOFError
def _read_ushort(file):
try:
return struct.unpack('>H', file.read(2))[0]
except struct.error:
raise EOFError
def _read_string(file):
length = ord(file.read(1))
if length == 0:
@ -194,13 +200,19 @@ def _read_float(f): # 10 bytes
def _write_short(f, x):
f.write(struct.pack('>h', x))
def _write_ushort(f, x):
f.write(struct.pack('>H', x))
def _write_long(f, x):
f.write(struct.pack('>l', x))
def _write_ulong(f, x):
f.write(struct.pack('>L', x))
def _write_string(f, s):
if len(s) > 255:
raise ValueError("string exceeds maximum pstring length")
f.write(struct.pack('b', len(s)))
f.write(struct.pack('B', len(s)))
f.write(s)
if len(s) & 1 == 0:
f.write(b'\x00')
@ -218,7 +230,7 @@ def _write_float(f, x):
lomant = 0
else:
fmant, expon = math.frexp(x)
if expon > 16384 or fmant >= 1: # Infinity or NaN
if expon > 16384 or fmant >= 1 or fmant != fmant: # Infinity or NaN
expon = sign|0x7FFF
himant = 0
lomant = 0
@ -234,9 +246,9 @@ def _write_float(f, x):
fmant = math.ldexp(fmant - fsmant, 32)
fsmant = math.floor(fmant)
lomant = int(fsmant)
_write_short(f, expon)
_write_long(f, himant)
_write_long(f, lomant)
_write_ushort(f, expon)
_write_ulong(f, himant)
_write_ulong(f, lomant)
from chunk import Chunk
@ -762,15 +774,15 @@ class Aifc_write:
if self._aifc:
self._file.write(b'AIFC')
self._file.write(b'FVER')
_write_long(self._file, 4)
_write_long(self._file, self._version)
_write_ulong(self._file, 4)
_write_ulong(self._file, self._version)
else:
self._file.write(b'AIFF')
self._file.write(b'COMM')
_write_long(self._file, commlength)
_write_ulong(self._file, commlength)
_write_short(self._file, self._nchannels)
self._nframes_pos = self._file.tell()
_write_long(self._file, self._nframes)
_write_ulong(self._file, self._nframes)
_write_short(self._file, self._sampwidth * 8)
_write_float(self._file, self._framerate)
if self._aifc:
@ -778,9 +790,9 @@ class Aifc_write:
_write_string(self._file, self._compname)
self._file.write(b'SSND')
self._ssnd_length_pos = self._file.tell()
_write_long(self._file, self._datalength + 8)
_write_long(self._file, 0)
_write_long(self._file, 0)
_write_ulong(self._file, self._datalength + 8)
_write_ulong(self._file, 0)
_write_ulong(self._file, 0)
def _write_form_length(self, datalength):
if self._aifc:
@ -791,8 +803,8 @@ class Aifc_write:
else:
commlength = 18
verslength = 0
_write_long(self._file, 4 + verslength + self._marklength + \
8 + commlength + 16 + datalength)
_write_ulong(self._file, 4 + verslength + self._marklength + \
8 + commlength + 16 + datalength)
return commlength
def _patchheader(self):
@ -810,9 +822,9 @@ class Aifc_write:
self._file.seek(self._form_length_pos, 0)
dummy = self._write_form_length(datalength)
self._file.seek(self._nframes_pos, 0)
_write_long(self._file, self._nframeswritten)
_write_ulong(self._file, self._nframeswritten)
self._file.seek(self._ssnd_length_pos, 0)
_write_long(self._file, datalength + 8)
_write_ulong(self._file, datalength + 8)
self._file.seek(curpos, 0)
self._nframes = self._nframeswritten
self._datalength = datalength
@ -827,13 +839,13 @@ class Aifc_write:
length = length + len(name) + 1 + 6
if len(name) & 1 == 0:
length = length + 1
_write_long(self._file, length)
_write_ulong(self._file, length)
self._marklength = length + 8
_write_short(self._file, len(self._markers))
for marker in self._markers:
id, pos, name = marker
_write_short(self._file, id)
_write_long(self._file, pos)
_write_ulong(self._file, pos)
_write_string(self._file, name)
def open(f, mode=None):