On RAM: the .idx and .pack files become links to a .lock and the original download respectively.
Assume some feature (such as record locking) supported by SFS but not JXFS or RAM: is required.

There are three changes here:
- correctly propogate error code from failed object lookups
- make zlib inflate use our allocators
- add OID to notfound error in ODB lookups

This fixes all the warnings on win64 except those in deps, which
come from the regex code.

Also cleaned up some previously converted code that still had
little things to polish.

This migrates odb.c, odb_loose.c, odb_pack.c and pack.c to
the new style of error handling.  Also got the unix and win32
versions of map.c.  There are some minor changes to other
files but no others were completely converted.

This also contains an update to filebuf so that a zeroed out
filebuf will not think that the fd (== 0) is actually open
(and inadvertently call close() on fd 0 if cleaned up).

Lastly, this was built and tested on win32 and contains a
bunch of fixes for the win32 build which was pretty broken.

Yes, this is error handling solely for `refs.c`, but some of the
abstractions leak all ofer the code base.

This is legacy compat stuff for when `deflateBound` is not defined, but
we're not embedding zlib and that function is always available. Kill
that with fire.

Signed-off-by: schu <schu-github@schulog.org>

This takes all of the functions that look up simple data about
paths (such as `git_futils_isdir`) and moves them over to path.h
(becoming `git_path_isdir`).  This leaves fileops.h just with
functions that actually manipulate the filesystem or look at
the file contents in some way.

As part of this, the dir.h header which is really just for win32
support was moved into win32 (with some minor changes).

off_t is always 32 bits in Windows, which is beyond stupid, but we just
don't care anymore because we're using `git_off_t` which is assured to
be 64 bits on all platforms, regardless of compilation mode. Just
ensure that no casts to `off_t` are performed.

Also, the check for `off_t` overflows has been dropped, once again,
because the size of our offsets is always 64 bits on all platforms.

Fixes #534

See `global.c` for a description of what we're doing.

When libgit2 is built with GIT_THREADS support, the threading system
must be explicitly initialized with `git_threads_init()`.

Ensure that all memory related functions (malloc, calloc, strdup, free,
etc) are using their respective `git__` wrappers.

This makes libgit2 more closely match Git, which only checks for
ambiguous pack entries when given short hashes.

Note that the only time this is ever relevant is when a pack has the
same object more than once (it's happened in the wild, I promise).

There were quite a few places were spaces were being used instead of
tabs. Try to catch them all. This should hopefully not break anything.
Except for `git blame`. Oh well.

1. The license header is technically not valid if it doesn't have a
copyright signature.

2. The COPYING file has been updated with the different licenses used in
the project.

3. The full GPLv2 header in each file annoys me.

There is no need in STRLEN macros. Compilers can do this trivial
optimization on its own.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>

When indexing a file with ref deltas, a temporary cache for the
offsets has to be built, as we don't have an index file yet. If the
user takes the responsiblity for filling the cache, the packing code
will look there first when it finds a ref delta.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

Don't assume that it's always going to work.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

The callers immediately throw away the offset, so we don't need any
logical changes in any of them. This will be useful for the indexer,
as it does need to know where the compressed data ends.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

On the way, store the fd and the size in the mwindow file.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>