Issue #19623: Fixed writing to unseekable files in the aifc module.
Fixed writing 'ulaw' (lower case) compressed AIFC files.
diff --git a/Lib/aifc.py b/Lib/aifc.py
index d8b7fab..9ac710f 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -778,7 +778,7 @@
def _ensure_header_written(self, datasize):
if not self._nframeswritten:
- if self._comptype in ('ULAW', 'ALAW'):
+ if self._comptype in ('ULAW', 'ulaw', 'ALAW', 'alaw'):
if not self._sampwidth:
self._sampwidth = 2
if self._sampwidth != 2:
@@ -844,7 +844,7 @@
if self._datalength & 1:
self._datalength = self._datalength + 1
if self._aifc:
- if self._comptype in ('ULAW', 'ALAW'):
+ if self._comptype in ('ULAW', 'ulaw', 'ALAW', 'alaw'):
self._datalength = self._datalength // 2
if self._datalength & 1:
self._datalength = self._datalength + 1
@@ -852,7 +852,10 @@
self._datalength = (self._datalength + 3) // 4
if self._datalength & 1:
self._datalength = self._datalength + 1
- self._form_length_pos = self._file.tell()
+ try:
+ self._form_length_pos = self._file.tell()
+ except (AttributeError, IOError):
+ self._form_length_pos = None
commlength = self._write_form_length(self._datalength)
if self._aifc:
self._file.write('AIFC')
@@ -864,7 +867,8 @@
self._file.write('COMM')
_write_ulong(self._file, commlength)
_write_short(self._file, self._nchannels)
- self._nframes_pos = self._file.tell()
+ if self._form_length_pos is not None:
+ self._nframes_pos = self._file.tell()
_write_ulong(self._file, self._nframes)
if self._comptype in ('ULAW', 'ulaw', 'ALAW', 'alaw', 'G722'):
_write_short(self._file, 8)
@@ -875,7 +879,8 @@
self._file.write(self._comptype)
_write_string(self._file, self._compname)
self._file.write('SSND')
- self._ssnd_length_pos = self._file.tell()
+ if self._form_length_pos is not None:
+ self._ssnd_length_pos = self._file.tell()
_write_ulong(self._file, self._datalength + 8)
_write_ulong(self._file, 0)
_write_ulong(self._file, 0)