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SF #918101, allow files >= 8 GB using GNU extension

This commit is contained in:
Neal Norwitz 2004-07-20 22:23:02 +00:00
parent a4f651a2ae
commit d96d1015ef
2 changed files with 38 additions and 11 deletions
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11
Doc/lib/libtarfile.tex
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@ -256,11 +256,12 @@ tar archive several times. Each archive member is represented by a
\begin{memberdesc}{posix}
If true, create a \POSIX{} 1003.1-1990 compliant archive. GNU
extensions are not used, because they are not part of the \POSIX{}
standard. This limits the length of filenames to at most 256 and
link names to 100 characters. A \exception{ValueError} is raised
if a pathname exceeds this limit. If false, create a GNU tar
compatible archive. It will not be \POSIX{} compliant, but can
store pathnames of unlimited length.
standard. This limits the length of filenames to at most 256,
link names to 100 characters and the maximum file size to 8
gigabytes. A \exception{ValueError} is raised if a file exceeds
this limit. If false, create a GNU tar compatible archive. It
will not be \POSIX{} compliant, but can store files without any
of the above restrictions.
\end{memberdesc}
\begin{memberdesc}{dereference}

34
Lib/tarfile.py
View File

@ -659,7 +659,17 @@ class TarInfo(object):
tarinfo.mode = int(buf[100:108], 8)
tarinfo.uid = int(buf[108:116],8)
tarinfo.gid = int(buf[116:124],8)
# There are two possible codings for the size field we
# have to discriminate, see comment in tobuf() below.
if buf[124] != chr(0200):
tarinfo.size = long(buf[124:136], 8)
else:
tarinfo.size = 0L
for i in range(11):
tarinfo.size <<= 8
tarinfo.size += ord(buf[125 + i])
tarinfo.mtime = long(buf[136:148], 8)
tarinfo.chksum = int(buf[148:156], 8)
tarinfo.type = buf[156:157]
@ -689,16 +699,28 @@ class TarInfo(object):
def tobuf(self):
"""Return a tar header block as a 512 byte string.
"""
name = self.name
# Prefer the size to be encoded as 11 octal ascii digits
# which is the most portable. If the size exceeds this
# limit (>= 8 GB), encode it as an 88-bit value which is
# a GNU tar feature.
if self.size <= MAXSIZE_MEMBER:
size = "%011o" % self.size
else:
s = self.size
size = ""
for i in range(11):
size = chr(s & 0377) + size
s >>= 8
size = chr(0200) + size
# The following code was contributed by Detlef Lannert.
parts = []
for value, fieldsize in (
(name, 100),
(self.name, 100),
("%07o" % (self.mode & 07777), 8),
("%07o" % self.uid, 8),
("%07o" % self.gid, 8),
("%011o" % self.size, 12),
(size, 12),
("%011o" % self.mtime, 12),
(" ", 8),
(self.type, 1),
@ -1236,7 +1258,11 @@ class TarFile(object):
tarinfo.linkname = normpath(tarinfo.linkname)
if tarinfo.size > MAXSIZE_MEMBER:
raise ValueError, "file is too large (>8GB)"
if self.posix:
raise ValueError, "file is too large (>= 8 GB)"
else:
self._dbg(2, "tarfile: Created GNU tar largefile header")
if len(tarinfo.linkname) > LENGTH_LINK:
if self.posix: