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Make extracting single files from RAR archives more efficient

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This commit is contained in:
Kovid Goyal 2010-02-20 14:32:41 -07:00
parent 466fb8f4f6
commit 76c6434898
1 changed files with 44 additions and 31 deletions
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75
src/calibre/libunrar.py
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@ -217,7 +217,41 @@ def names(path):
finally:
_libunrar.RARCloseArchive(arc_data)
def extract_member(path, match=re.compile(r'\.(jpg|jpeg|gif|png)\s*$', re.I), name=None):
def _extract_member(path, match, name):
def is_match(fname):
return (name is not None and fname == name) or \
(match is not None and match.search(fname) is not None)
open_archive_data = RAROpenArchiveDataEx(ArcName=path, OpenMode=RAR_OM_EXTRACT, CmtBuf=None)
arc_data = _libunrar.RAROpenArchiveEx(byref(open_archive_data))
try:
if open_archive_data.OpenResult != 0:
raise UnRARException(_interpret_open_error(open_archive_data.OpenResult, path))
header_data = RARHeaderDataEx(CmtBuf=None)
first = True
while True:
if _libunrar.RARReadHeaderEx(arc_data, byref(header_data)) != 0:
raise UnRARException('%s has no files'%path if first
else 'No match found in %s'%path)
file_name = header_data.FileNameW
if is_match(file_name):
PFCode = _libunrar.RARProcessFileW(arc_data, RAR_EXTRACT, None, None)
if PFCode != 0:
raise UnRARException(_interpret_process_file_error(PFCode))
abspath = os.path.abspath(*file_name.split('/'))
return abspath
else:
PFCode = _libunrar.RARProcessFileW(arc_data, RAR_SKIP, None, None)
if PFCode != 0:
raise UnRARException(_interpret_process_file_error(PFCode))
first = False
finally:
_libunrar.RARCloseArchive(arc_data)
def extract_member(path, match=re.compile(r'\.(jpg|jpeg|gif|png)\s*$', re.I),
name=None, as_file=False):
if hasattr(path, 'read'):
data = path.read()
f = NamedTemporaryFile(suffix='.rar')
@ -225,34 +259,13 @@ def extract_member(path, match=re.compile(r'\.(jpg|jpeg|gif|png)\s*$', re.I), na
f.flush()
path = f.name
def is_match(fname):
return (name is not None and fname == name) or \
(match is not None and match.search(fname))
with TemporaryDirectory('_libunrar') as dir:
with CurrentDir(dir):
open_archive_data = RAROpenArchiveDataEx(ArcName=path, OpenMode=RAR_OM_EXTRACT, CmtBuf=None)
arc_data = _libunrar.RAROpenArchiveEx(byref(open_archive_data))
try:
if open_archive_data.OpenResult != 0:
raise UnRARException(_interpret_open_error(open_archive_data.OpenResult, path))
header_data = RARHeaderDataEx(CmtBuf=None)
while True:
if _libunrar.RARReadHeaderEx(arc_data, byref(header_data)) != 0:
raise UnRARException('%s has no files'%path)
file_name = header_data.FileNameW
if is_match(file_name):
PFCode = _libunrar.RARProcessFileW(arc_data, RAR_EXTRACT, None, None)
if PFCode != 0:
raise UnRARException(_interpret_process_file_error(PFCode))
return header_data.FileNameW.replace('/', os.sep), \
open(os.path.join(dir, *header_data.FileNameW.split('/')), 'rb').read()
else:
PFCode = _libunrar.RARProcessFileW(arc_data, RAR_SKIP, None, None)
if PFCode != 0:
raise UnRARException(_interpret_process_file_error(PFCode))
finally:
_libunrar.RARCloseArchive(arc_data)
path = os.path.abspath(path)
if as_file:
path = _extract_member(path, match, name)
return path, open(path, 'rb')
else:
with TemporaryDirectory('_libunrar') as tdir:
with CurrentDir(tdir):
path = _extract_member(path, match, name)
return path, open(path, 'rb').read()