Copyright (c) 2012 Moinak Ghosh

Prerequisites
=============
64-bit System.
GCC 4.4 (with mpfr, ppl and cloog support packages for loop
	 vectorization).
libz (zlib) and development packages.
Libbz2 and development packages.
OpenSSL version 0.9.8 or greater.
Libarchive 3.x or greater and its development packages.

Basic Installation
==================
The simplest process to build and install this utility is:

./config
make
make install

The current makefiles and config scripts assume Gcc compiler is
in the PATH. Please update PATH before running config if that is
not the case.

In order to remove all binaries:
make clean

Remove all binaries and the generated Makefile:
make distclean

Strictly speaking the 'make install' step is not required to
run the utility as it is a single stand alone program for now.

The config script controls various compile time parameters and
generates the actual Makefile. You can get a short description
of all the options by running:

./config --help

NOTE: Basic Installation does not enable support for Libbsc, a
      new block-sorting compressor (similar to but better than
      Bzip2). See below for details.

Testing
=======

After running make as given above you can run:
make test

This will generate some data files from /usr/bin /usr/share and
/usr/include directories and then run a whole lot of tests. These
execute pcompress with a wide variety of combinations of options.
For every test both compression and decompression are performed
and after every decompression the decompressed file is verified
byte for byte with the original using the diff utility.

It takes a long time to run all the tests. The complete test log
is stored in the file test.log. Test failures are indicated by the
error message starting with the word "FATAL". All other error
messages visible in the log are a result of negative testing where
the utility is expected to exit with an error.

The files test/t1.tst, test/t2.tst and so on are individual test
suites. It is possible to run a single test suite. For example to
run test/t4.tst the following command can be used:
make test TESTSUITE=4

Custom Installation
===================
The options to the config script are detailed below. Note that this
is not the usual GNU Autoconf script.

./config [<options>]

<options> can be one of the following:

<options> can be one of the following:

--prefix=<val>          The installation prefix (default: /usr).

--enable-debug          Enable debug mode compilation (default: disabled).

--disable-allocator     Disable use of internal memory allocator mechanism (default: enabled).

--enable-debug-stats    Enable printing of some verbose debug info (default: disabled).

--with-openssl=<path to OpenSSL installation tree> (Default: System)
                        This defaults to the system's OpenSSL library. You can use this option
                        if you want to use an alternate OpenSSL installation.

--with-zlib=<path to zlib installation tree> (Default: System)
                        Enable building against an alternate Zlib installation.

--with-bzlib=<path to Bzip2 library installation tree> (Default: System)
                        Enable building against an alternate Bzip2 and library installation.

--with-external-libbsc=<path to libbsc source tree>
                        Enable building with exernal libbsc sources. Can be used to link with
                        ASLv2 libbsc when using MPLv2 licensed sources.

--wavpack-dir=<path to WavPack source tree>
                        Points to the directory containing the WavPack sources. This option
                        must be specified if --disable-wavpack is not provided.

--disable-wavpack       Disables the WavPack filter.

--no-sse-detect         Do NOT attempt to probe the system's SSE capability for build flags.
                        Implies '--no-avx-detect' below.

--no-avx-detect         Do NOT attempt to probe the system's AVX capability for build flags.

--no-1.3-archive-compat Disable compatibility with compressed archives created with Pcompress
                        version 1.3 (default: retain compatibility). Hash formats changed from
                        version 1.3 to 1.4 so this option is required if files created using
                        1.3 need to be decompressed by version 1.4 onwards.

--limit-key128          Limit key length to 128-bit encryption keys. Otherwise the default is to
                        use 256-bit keys changeable at runtime via the '-k <keylen>' option.

--help                  Display this help message.

Additional compilation flags can be passed to make like this:
   make EXTRA_CPPFLAGS=<...> EXTRA_LDFLAGS=<...>