Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Also, fully purge the NO_OPENSSL build variable.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

In a similar way to commit 9b173803 ("Make 'make clean' wipe all
object files in src/*/", 2010-04-14), we use a shell glob when
removing editor backup files.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

This results in the 'sparse' and 'coverage' targets including the
C source files for the built-in SHA1 routines. In addition to the
sparse check, this results in the generation of the '.gcov' file
and inclusion in the test coverage report.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Commit 5dddf7c8 (Add block-sha1 in favour of the mozilla routines
2010-04-14) introduced the "bswap.h" header file which, for x86
or x86-64 machines, provides a "sane" implementation of ntohl()
and htonl().

The wsock32 library, on the msvc and MinGW build, is only included
in the link to supply the ntohl()/htonl() routines.  Since we now
have a built-in implementation, we can remove the wsock32 library
from the link.

[This will break a Windows build on a non-intel machine]

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

In particular, using the normal (or production) compiler
warning level (-W3), msvc complains as follows:

.../sha1.c(244) : warning C4018: '<' : signed/unsigned mismatch
.../sha1.c(270) : warning C4244: 'function' : conversion from \
   'unsigned __int64' to 'unsigned long', possible loss of data
.../sha1.c(271) : warning C4244: 'function' : conversion from \
   'unsigned __int64' to 'unsigned long', possible loss of data

Note that gcc issues a similar complaint about line 244 when
compiling with -Wextra.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Commit 5dddf7c8 (Add block-sha1 in favour of the mozilla routines
2010-04-14) introduced the "bswap.h" header file which contains
an inline function (default_swab32()).  The msvc compiler does
not support the inline keyword which causes the build to fail
with a syntax error.

However, msvc does support inline functions using the __inline
keyword language extension.  We already have the GIT_INLINE()
macro that allows us to hide this syntatic difference. In order
to fix the build, we simply use GIT_INLINE() in the definition
of the default_swab32() function.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

* ramsay/dev:
  Add a pack index 'virtual function' to fetch an index entry
  Add a pack index 'virtual function' to search by file offset
  Change the interface of the pack index search function
  Add an 64-bit offset table index bounds check for v2 pack index
  Add a minimum size check when opening an v2 pack index file
  win32: Add separate MinGW and MSVC compatability header files
  Makefile: Add support for custom build options in config.mak file
  Fix some coding style issues

Signed-off-by: Andreas Ericsson <ae@op5.se>

Since block-sha1 from git.git has such excellent performance, we
can also get rid of the openssl dependency. It's rather simple
to add it back later as an optional extra, but we really needn't
bother to pull in the entire ssl library and have to deal with
linking issues now that we have the portable and, performance-wise,
truly excellent block-sha1 code to fall back on.

Since this requires a slight revamp of the build rules anyway, we
take the opportunity to fix including EXTRA_OBJS in the final build
as well.

The block-sha1 code was originally implemented for git.git by
Linus Torvalds <torvalds@linux-foundation.org> and was later
polished by Nicolas Pitre <nico@cam.org>.

Signed-off-by: Andreas Ericsson <ae@op5.se>

We don't use it yet, but now we have it there at least.

All the non-trivial parts of it appears to have been written
and contributed to git.git by some anonymous genius. The original
implementation was done by Paul Mackerras <paulus@samba.org>.

Signed-off-by: Andreas Ericsson <ae@op5.se>

Signed-off-by: Andreas Ericsson <ae@op5.se>

Instead of naming the subdirectories explicitly (which will result in
us forgetting about one sooner or later), we change the shell glob
pattern to wipe all object files from all subdirectories under src/.

Signed-off-by: Andreas Ericsson <ae@op5.se>

Given an index entry number, the idx_get() function returns an
(version agnostic) index_entry structure containing all of the
information required to unpack the corresponding object from
the '.pack' file.

Since the v1 and v2 file formats differ in the layout of the
object records, we provide two implementations of the get
function and initialise the function pointer appropriately.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

In addition to searching the index by oid, we need to search by
'.pack' file offset, particularly when processing OBJ_OFS_DELTA
objects. Since the v1 and v2 file formats differ in the layout
of the object records, we provide two implementations of the
search function and initialise the (virtual) function pointer
appropriately.

Note that, as part of the creation of the 'offset index', we also
add a check that the offset data in the index is within the bounds
of the '.pack' file. Having sorted the file offsets, while creating
the index, we only need to check the smallest and largest values.

The offset index consists of the im_off_idx array, which contains
the index entry numbers sorted into file offset order, and the
im_off_next mapping array. The im_off_next array maps an index
entry number to the 'next' index entry in file offset order.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

In particular, on a successful search, we now return the index
entry number of the object rather than the '.pack' file offset.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

This reduces the global namespace pollution and allows for
a win32 compiler (eg. Open Watcom) to provide these routines
in a header other than <dirent.h> (eg in <io.h>).

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Add a new "coverage" Makefile target that re-builds the
library and tests using the gcc compiler/linker flags
required by gcov, runs the test suite to capture the
runtime data, then compiles a coverage report.

The report, which is saved in a file named "untested",
consists of a list of untested files, followed by a list
of untested functions. More detailed execution statistics
are given in the gcov log files which are saved in the
top-level directory (named like src#hash.c.gcov).

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Add some makefile targets, which use valgrind's memcheck tool to
run the tests, in order to help diagnose memory problems in the
library.

In addition, we enable the '--leak-check' option to report on any
memory leaks. However, unlike the other memory problems reported
by memcheck, memory leak reports do not result in an error exit
from valgrind. (So memory leaks are reported on stderr, but don't
halt the test run.)

A suppressions file (tests.supp) is included since libz triggers
some false positives.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>