On 02:23 pm, c...@hagenlocher.org wrote:
On Fri, Dec 12, 2008 at 6:19 AM, Antoine Pitrou <solip...@pitrou.net>
wrote:
Curt Hagenlocher <curt <at> hagenlocher.org> writes:
No, but it also has to interact with filesystems of possibly invalid
or indeterminate encodings. What does java.io do?
My point was that Python doesn't have to interact with the Java IO
libraries,
while it has to interact with the Unix and Windows IO APIs.
Of course. But the Java IO libraries have to interact with the Unix
and Windows IO APIs as well. It might be interesting to know how they
handle similar situations.
Apparently Java has the facilities to do the right thing, but actually
it's just broken.
My locale says UTF-8. However, if I create a non-decodable file with
Python (2), there are three ways I can tell Java to open it: I can ask
for it with a string (that won't work, because no valid UTF-8 string
maps to an undecodable string, pretty much by definition). I can list
the directory that it's in (presuming that *that's* a directory) and get
a java.io.File, which could be retaining all the interesting
information, or I can use a URI, which is a string that resolves to
octets before it resolves to characters again.
However, it looks like Java screws up in every case.
Here's a transcript from the ever-helpful jython:
gl...@nhuvasarim:~/tmp$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) [GCC 4.2.3 (Ubuntu
4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
file("\xff\xff", "wb").write("lolz\n")
gl...@nhuvasarim:~/tmp$ jython
Jython 2.2.1 on java1.6.0_07
Type "copyright", "credits" or "license" for more information.
from java.io import File
fileList = File(".").listFiles()
fileList
array(java.io.File,[./
fileList[0].__class__
<jclass java.io.File 1>
from java.io import FileReader
FileReader(fileList[0])
Traceback (innermost last):
File "<console>", line 1, in ?
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileReader.<init>(FileReader.java:55)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
java.io.FileNotFoundException: java.io.FileNotFoundException: ./ÿFDÿFD (No
such file or directory)
from java.net import URI
u = URI("file:///home/glyph/tmp/%ff%ff")
FileReader(File(u))
Traceback (innermost last):
File "<console>", line 1, in ?
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileReader.<init>(FileReader.java:55)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
java.io.FileNotFoundException: java.io.FileNotFoundException:
/home/glyph/tmp/ÿFDÿFD (No such file or directory)
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