31b1f56902
Updated fix for issue #12 Add check for correct Libarchive version. Update header checks to abort if not found.
130 lines
4.7 KiB
Text
130 lines
4.7 KiB
Text
Copyright (c) 2012 Moinak Ghosh
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Prerequisites
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=============
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64-bit System.
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GCC 4.4 (with mpfr, ppl and cloog support packages for loop
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vectorization).
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libz (zlib) and development packages.
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Libbz2 and development packages.
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OpenSSL version 0.9.8 or greater.
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Libarchive 3.x or greater and its development packages.
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Basic Installation
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==================
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The simplest process to build and install this utility is:
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./config
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make
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make install
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The current makefiles and config scripts assume Gcc compiler is
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in the PATH. Please update PATH before running config if that is
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not the case.
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In order to remove all binaries:
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make clean
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Remove all binaries and the generated Makefile:
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make distclean
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Strictly speaking the 'make install' step is not required to
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run the utility as it is a single stand alone program for now.
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The config script controls various compile time parameters and
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generates the actual Makefile. You can get a short description
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of all the options by running:
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./config --help
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NOTE: Basic Installation does not enable support for Libbsc, a
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new block-sorting compressor (similar to but better than
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Bzip2). See below for details.
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Testing
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=======
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After running make as given above you can run:
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make test
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This will generate some data files from /usr/bin /usr/share and
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/usr/include directories and then run a whole lot of tests. These
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execute pcompress with a wide variety of combinations of options.
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For every test both compression and decompression are performed
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and after every decompression the decompressed file is verified
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byte for byte with the original using the diff utility.
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It takes a long time to run all the tests. The complete test log
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is stored in the file test.log. Test failures are indicated by the
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error message starting with the word "FATAL". All other error
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messages visible in the log are a result of negative testing where
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the utility is expected to exit with an error.
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The files test/t1.tst, test/t2.tst and so on are individual test
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suites. It is possible to run a single test suite. For example to
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run test/t4.tst the following command can be used:
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make test TESTSUITE=4
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Custom Installation
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===================
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The options to the config script are detailed below. Note that this
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is not the usual GNU Autoconf script.
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./config [<options>]
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<options> can be one of the following:
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--prefix=<val> The installation prefix.
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This is set to /usr by default. However alternate
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prefix needs to eb used during packaging.
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--enable-debug Enable debug mode compilation.
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This reduces the compiler optimization level to
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basic and taks out all the loop optimization flags.
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This is primarily to aid debugging.
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--disable-allocator Disable use of internal memory allocator mechanism.
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The internal allocator can be totally disabled by
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setting this build time flag. It is also possible
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to dynamically disable the allocator by setting the
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following env variable:
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ALLOCATOR_BYPASS=1
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--enable-debug-stats Enable printing of some verbose debug info.
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This at present shows some info related to Dedupe
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efficiency.
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--with-zlib=<path to zlib installation tree> (Default: System)
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Enable building against an alternate Zlib installation.
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--with-bzlib=<path to Bzip2 library installation tree> (Default: System)
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Enable building against an alternate Bzip2 and library
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installation.
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--with-libarchive=<path to libarchive installation tree> (Default: System)
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Enable building against an alternate libarchive installation.
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NOTE:
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Pcompress only uses basic Libarchive functionality of
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creating PAX archives. No other functionality or filter
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support is used. So a local static libarchive build with
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most features disabled can be used with this option.
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--no-sse-detect Do not try to detect the CPU's SSE capability. This
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mode will simply use SSE2 as the fallback default.
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Using SSE4 and later improves performance significantly.
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--no-1.3-archive-compat Disable compatibility with compressed archives created with Pcompress
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version 1.3 (default: retain compatibility). Hash formats changed from
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version 1.3 to 1.4 so this option is required if files created using
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1.3 need to be decompressed by version 1.4 onwards.
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--use-key256 Use 256-bit encryption keys. Default key length is
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128-bit.
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--help Display the help message.
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Additional compilation flags can be passed to make like this:
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make EXTRA_CPPFLAGS=<...> EXTRA_LDFLAGS=<...>
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