This change introduces JSON_C_OBJECT_ADD_CONSTANT_KEY
as a replacement of JSON_C_OBJECT_KEY_IS_CONSTANT.

The description of json_object_object_add_ex tells to
look at the flags JSON_C_OBJECT_ADD_* but it is not
for JSON_C_OBJECT_KEY_IS_CONSTANT.

From the point of vue of a developper using json-c,
the function json_object_object_add_ex is mainly used,
not the hash facility, it seems more natural to provide
a regular naming of prefix JSON_C_OBJECT_ADD_CONSTANT_KEY.

Add a test to check for this too.

The data structures linkhash and printbuf are limited to 2 GB in size
due to a signed integer being used to track their current size.

If too much data is added, then size variable can overflow, which is
an undefined behaviour in C programming language.

Assuming that a signed int overflow just leads to a negative value,
like it happens on many sytems (Linux i686/amd64 with gcc), then
printbuf is vulnerable to an out of boundary write on 64 bit systems.

If a linkhash with a size of zero is created, then modulo operations
are prone to division by zero operations.

Purely protective measure against bad usage.

2.replace json_object_get/put API with json_object_retain/release, as they operate the reference counter, and confused with array_list_get/put_idx.
3.replace array_list_get/put_idx API with array_list_get/insert to make them more clear to use.

Added #ifdef conditions for MinGW because this compiler doesn't define
gcc atomic builtins, so __sync_val_compare_and_swap was not found
neither any of any __GCC_HAVE_SYNC_COMPARE_AND_SWAP_* definition

To better distinguish between entry->k and entry->v being const within linkhash, but non-const outside, add lh_entry_v() and lh_entry_k() accessors.
Make lh_entry->k const.

Also, fix the types of the variables when building on Windows.
Also, should address issue #214.

That commit introduced read-only keys, but when the hash table
was resized, that attribute was not preserved. This resulted in
an invalid free at time of table destruction.

Performance improvements

These items were used for statistics tracking, but no code at all
exists to consume them. By removing them we save

a) space
   because they counters required space, and did so in each and every
   json object

b) performance
   because calloc() needs to write less data and the counters are
   no longer maintained; cache performance can be better, load
   on OS main memory is lighter

We could conditionally enable/disable these counters, but I have not
done this they were really nowhere used and it looked more like a
left-over from the import of hashtable code.

This also adds a new API json_global_set_string_hash() which permits
to select the hash function. The default one is the only one that was
previously present. So there are no changes to existing apps, and the
new hash function needs to be explicitely be opted in. Especially for
smaller strings, the perllike functions seems to be around twice as
fast as the other one, with similarly good results in value distribution.

This provides more control over some detail aspects, many
of which are performance related.

This can be a very considerable performance saver.

Fix Win32 build problems

* CVE-2013-6371: hash collision denial of service
* CVE-2013-6370: buffer overflow if size_t is larger than int

* Return value of json_object_object_add() changed from void to int.
  Return value now indicates success or failure.

* Check whether allocations are successful.

* Do not exit program from within the library.

New lh_table_lookup_ex() method protects itself against null pointers
and invalid objects being passed in.

Change the resize check from "count > size" to "count >= size" to avoid a
potential infinite loop with high load factors and a full hash table.

were filled then successively freed.
    Spotted by Jean-Marc Naud, j dash m at newtraxtech dot com


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@54 327403b1-1117-474d-bef2-5cb71233fd97

* Add casts from void* to type of assignment when using malloc 
  * Add #ifdef __cplusplus guards to all of the headers
  * Add typedefs for json_object, json_tokener, array_list, printbuf, lh_table
    Michael Clark, <michael@metaparadigm.com>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@33 327403b1-1117-474d-bef2-5cb71233fd97

to not return TRUE for zero length string. Remove redundant includes.
    Erik Hovland, erik at hovland dot org


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@31 327403b1-1117-474d-bef2-5cb71233fd97

Gerard Krol, g dot c dot krol at student dot tudelft dot nl

Update version number to 0.9



git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@27 327403b1-1117-474d-bef2-5cb71233fd97

Dotan Barak, dotanba at gmail dot com



git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@23 327403b1-1117-474d-bef2-5cb71233fd97

* Add ifdef C++ extern "C" to headers
  * Use simpler definition of min and max in bits.h
    Larry Lansing, llansing at fuzzynerd dot com

  * Remove automake 1.6 requirement
  * Move autogen commands into autogen.sh. Update README
  * Remove error pointer special case for Windows
  * Change license from LGPL to MIT
    Michael Clark <michael@metaparadigm.com>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@10 327403b1-1117-474d-bef2-5cb71233fd97

Added a Win32/Win64 compliant implementation of vasprintf
  * debug.c - C. Watford (christopher dot watford at gmail dot com)
    Removed usage of vsyslog on Win32/Win64 systems, needs to be handled
    by a configure script
  * json_object.c - C. Watford (christopher dot watford at gmail dot com)
    Added scope operator to wrap usage of json_object_object_foreach, this
    needs to be rethought to be more ANSI C friendly
  * json_object.h - C. Watford (christopher dot watford at gmail dot com)
    Added Microsoft C friendly version of json_object_object_foreach
  * json_tokener.c - C. Watford (christopher dot watford at gmail dot com)
    Added a Win32/Win64 compliant implementation of strndup
  * json_util.c - C. Watford (christopher dot watford at gmail dot com)
    Added cast and mask to suffice size_t v. unsigned int conversion
    correctness
  * json_tokener.c - sign reversal issue on error info for nested object parse
    spotted by Johan Bj�rklund (johbjo09 at kth.se)
  * json_object.c - escape " in json_escape_str
  * Change to automake and libtool to build shared and static library
    Michael Clark <michael@metaparadigm.com>


git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@4 327403b1-1117-474d-bef2-5cb71233fd97

git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@2 327403b1-1117-474d-bef2-5cb71233fd97