Support lzma module in Python 3.3

doc/changelog.txt

@@ -1,5 +1,7 @@
 0.19 "" (released xx.xx.2013)
 
+* Support the lzma module in Python >= 3.3
+
 
 0.18 "Skyfall" (released 15.12.2012)
 

patoolib/__init__.py

@@ -79,6 +79,13 @@ ArchiveMimetypes = {
     'audio/flac': 'flac',
 }
 
+try:
+    # use Python 3 lzma module if available
+    import lzma
+    py_lzma = ('py_lzma',)
+except ImportError:
+    py_lzma = ()
+
 # List of programs supporting the given archive format and command.
 # If command is None, the program supports all commands (list, extract, ...)
 # Programs starting with "py_" are Python modules.
@@ -208,10 +215,10 @@ ArchivePrograms = {
     },
     # XXX Python 3.3 has native lzma module - use that after porting to 3.3
     'lzma': {
-        'extract': ('lzma',),
+        'extract': ('lzma',) + py_lzma,
         'list': ('py_echo',),
         'test': ('lzma',),
-        'create': ('lzma',),
+        'create': ('lzma',) + py_lzma,
     },
     'rzip': {
         'extract': ('rzip',),

patoolib/programs/py_lzma.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2012 Bastian Kleineidam
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""Archive commands for the lzma Python module."""
+from .. import util
+import lzma
+
+READ_SIZE_BYTES = 1024*1024
+
+def extract_lzma(archive, compression, cmd, **kwargs):
+    """Extract a LZMA archive with the lzma Python module."""
+    verbose = kwargs['verbose']
+    outdir = kwargs['outdir']
+    if verbose:
+        util.log_info('extracting %s...' % archive)
+    targetname = util.get_single_outfile(outdir, archive)
+    lzmafile = lzma.LZMAFile(archive)
+    try:
+        with open(targetname, 'wb') as targetfile
+            data = lzmafile.read(READ_SIZE_BYTES)
+            while data:
+                targetfile.write(data)
+                data = lzmafile.read(READ_SIZE_BYTES)
+    finally:
+        lzmafile.close()
+    if verbose:
+        util.log_info('... extracted to %s' % targetname)
+    return None
+
+
+def create_lzma(archive, compression, cmd, *args, **kwargs):
+    """Create a LZMA archive with the lzma Python module."""
+    verbose = kwargs['verbose']
+    if verbose:
+        util.log_info('creating %s...' % archive)
+    if len(args) > 1:
+        util.log_error('multi-file compression not supported in Python lzma')
+    lzmafile = lzma.LZMAFile(archive, 'wb')
+    try:
+        filename = args[0]
+        with open(filename) as srcfile:
+            data = srcfile.read(READ_SIZE_BYTES)
+            while data:
+                lzmafile.write(data)
+                data = srcfile.read(READ_SIZE_BYTES)
+            if verbose:
+                util.log_info('... added %s' % filename)
+    finally:
+        lzmafile.close()
+    return None