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author | Antoine Pitrou <solipsis@pitrou.net> | 2012-01-17 16:13:04 (GMT) |
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committer | Antoine Pitrou <solipsis@pitrou.net> | 2012-01-17 16:13:04 (GMT) |
commit | 03757ec4a571df0e871bd9136cae9d08841f8a6a (patch) | |
tree | a541ba154d20e6ecfe9503ce4e0af61c72236908 /Lib/aifc.py | |
parent | c77bb65deb6aa3c281243e0408efcb44be8a026e (diff) | |
download | cpython-03757ec4a571df0e871bd9136cae9d08841f8a6a.zip cpython-03757ec4a571df0e871bd9136cae9d08841f8a6a.tar.gz cpython-03757ec4a571df0e871bd9136cae9d08841f8a6a.tar.bz2 |
Issue #13589: Fix some serialization primitives in the aifc module.
Patch by Oleg Plakhotnyuk.
Diffstat (limited to 'Lib/aifc.py')
-rw-r--r-- | Lib/aifc.py | 48 |
1 files changed, 30 insertions, 18 deletions
diff --git a/Lib/aifc.py b/Lib/aifc.py index 7774325..775f39c 100644 --- a/Lib/aifc.py +++ b/Lib/aifc.py @@ -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): |