Bug in obspy.mseed.write(.., encoding=0) for small ASCII strings

[trac2github]

Working ...
{{{
from obspy.core import read, Trace, Stream, UTCDateTime
import numpy as np

data = np.fromstring("very big string with at least 17 chars", dtype='|S1')
tr = Trace(data=data)
tr.write("muh.mseed", format='MSEED', encoding=0, reclen=256)
}}}

Won't work:
{{{
data = np.fromstring("small string", dtype='|S1')
tr = Trace(data=data)
tr.write("muh.mseed", format='MSEED', encoding=0, reclen=256)
}}}

[trac2github]

[barsch] The tests above are working on a win32 box (vista) without problems.

[trac2github]

[krischer] Not working on 64bit OSX. But there is a different error message:

python(17624,0x7fff71022be0) malloc: *** error for object 0x10132beb0: pointer being freed was not allocated

[trac2github]

[krischer](In [882]) - Libmseed does not seem to determine the size of an ascii char correctly. Implemented workaround (closes #31). I do not know why error only occured with small ASCII strings.

[trac2github]

[krischer](In [884]) The commit yesterday didn't really fix #31. Implemented different workaround but I think valgrind will complain.

[trac2github]

[krischer](In [905]) - Created some test files for obspy.mseed using libmseed directly. Still need to add files in different byte orders.

• Added corresponding tests.
• libmseed seems to be able to write small ASCII strings without any problems (see Bug in obspy.mseed.write(.., encoding=0) for small ASCII strings #31). Maybe the fault is somewhere in our code.
• Compiled libmseed 2.4beta for all four OSX architectures.