use Compress::Raw::Bzip2 ;
my ($bz, $status) = new Compress::Raw::Bzip2 [OPTS]
or die "Cannot create bzip2 object: $bzerno\n";
$status = $bz->bzdeflate($input, $output);
$status = $bz->bzflush($output);
$status = $bz->bzclose($output);
my ($bz, $status) = new Compress::Raw::Bunzip2 [OPTS]
or die "Cannot create bunzip2 object: $bzerno\n";
$status = $bz->bzinflate($input, $output);
my $version = Compress::Raw::Bzip2::bzlibversion();
Although the primary purpose for the existence of "Compress::Raw::Bzip2" is for use by the "IO::Compress::Bzip2" and "IO::Compress::Bunzip2" modules, it can be used on its own for simple compression/uncompression tasks.
If successful, it will return the initialised compression object, $z and a $status of "BZ_OK" in a list context. In scalar context it returns the deflation object, $z, only.
If not successful, the returned compression object, $z, will be undef and $status will hold the a bzip2 error code.
Below is a list of the valid options:
Defaults to 1.
blockSize100k specifies the block size to be used for compression. It
should be a value between 1 and 9 inclusive, and the actual block size
used is 100000 x this figure. 9 gives the best compression but takes
most memory.
Defaults to 1.
This parameter controls how the compression phase behaves when
presented with worst case, highly repetitive, input data. If
compression runs into difficulties caused by repetitive data, the
library switches from the standard sorting algorithm to a fallback
algorithm. The fallback is slower than the standard algorithm by
perhaps a factor of three, but always behaves reasonably, no matter how
bad the input.
Lower values of workFactor reduce the amount of effort the standard
algorithm will expend before resorting to the fallback. You should set
this parameter carefully; too low, and many inputs will be handled by
the fallback algorithm and so compress rather slowly, too high, and
your average-to-worst case compression times can become very large. The
default value of 30 gives reasonable behaviour over a wide range of
circumstances.
Allowable values range from 0 to 250 inclusive. 0 is a special case,
equivalent to using the default value of 30.
Defaults to 0.
Returns "BZ_RUN_OK" on success and a "bzip2" error code on failure.
If "appendOutput" is enabled in the constructor for the bzip2 object, the compressed data will be appended to $output. If not enabled, $output will be truncated before the compressed data is written to it.
Returns "BZ_RUN_OK" on success and a "bzip2" error code on failure.
Returns "BZ_STREAM_END" on success and a "bzip2" error code on failure.
If not successful, the returned uncompression object, $z, will be undef and $status will hold the a bzip2 error code.
Below is a list of the valid options:
Defaults to 1.
If small is nonzero, the library will use an alternative decompression
algorithm which uses less memory but at the cost of decompressing more
slowly (roughly speaking, half the speed, but the maximum memory
requirement drops to around 2300k).
Defaults to 0.
When "LimitOutput" is used the size of the output buffer used will either be the 16k or the amount of memory already allocated to $output, whichever is larger. Predicting the output size available is tricky, so don't rely on getting an exact output buffer size.
When "LimitOutout" is not specified "$i->bzinflate" will use as much memory as it takes to write all the uncompressed data it creates by uncompressing the input buffer.
If "LimitOutput" is enabled, the "ConsumeInput" option will also be enabled.
This option defaults to false.
Defaults to 0.
Returns "BZ_OK" if the uncompression was successful, but the end of the compressed data stream has not been reached. Returns "BZ_STREAM_END" on successful uncompression and the end of the compression stream has been reached.
If "consumeInput" is enabled in the constructor for the bunzip2 object, $input will have all compressed data removed from it after uncompression. On "BZ_OK" return this will mean that $input will be an empty string; when "BZ_STREAM_END" $input will either be an empty string or will contain whatever data immediately followed the compressed data stream.
If "appendOutput" is enabled in the constructor for the bunzip2 object, the uncompressed data will be appended to $output. If not enabled, $output will be truncated before the uncompressed data is written to it.
BZ_RUN
BZ_FLUSH
BZ_FINISH
BZ_OK
BZ_RUN_OK
BZ_FLUSH_OK
BZ_FINISH_OK
BZ_STREAM_END
BZ_SEQUENCE_ERROR
BZ_PARAM_ERROR
BZ_MEM_ERROR
BZ_DATA_ERROR
BZ_DATA_ERROR_MAGIC
BZ_IO_ERROR
BZ_UNEXPECTED_EOF
BZ_OUTBUFF_FULL
BZ_CONFIG_ERROR
IO::Compress::FAQ
File::GlobMapper, Archive::Zip, Archive::Tar, IO::Zlib
The primary site for the bzip2 program is <http://www.bzip.org>.
See the module Compress::Bzip2
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.