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| 129 | .\" ======================================================================== |
| 130 | .\" |
| 131 | .IX Title "Compress::Raw::Bzip2 3" |
| 132 | .TH Compress::Raw::Bzip2 3 "2009-11-09" "perl v5.8.7" "User Contributed Perl Documentation" |
| 133 | .SH "NAME" |
| 134 | Compress::Raw::Bzip2 \- Low\-Level Interface to bzip2 compression library |
| 135 | .SH "SYNOPSIS" |
| 136 | .IX Header "SYNOPSIS" |
| 137 | .Vb 1 |
| 138 | \& use Compress::Raw::Bzip2 ; |
| 139 | .Ve |
| 140 | .PP |
| 141 | .Vb 2 |
| 142 | \& my ($bz, $status) = new Compress::Raw::Bzip2 [OPTS] |
| 143 | \& or die "Cannot create bzip2 object: $bzerno\en"; |
| 144 | .Ve |
| 145 | .PP |
| 146 | .Vb 3 |
| 147 | \& $status = $bz\->bzdeflate($input, $output); |
| 148 | \& $status = $bz\->bzflush($output); |
| 149 | \& $status = $bz\->bzclose($output); |
| 150 | .Ve |
| 151 | .PP |
| 152 | .Vb 2 |
| 153 | \& my ($bz, $status) = new Compress::Raw::Bunzip2 [OPTS] |
| 154 | \& or die "Cannot create bunzip2 object: $bzerno\en"; |
| 155 | .Ve |
| 156 | .PP |
| 157 | .Vb 1 |
| 158 | \& $status = $bz\->bzinflate($input, $output); |
| 159 | .Ve |
| 160 | .PP |
| 161 | .Vb 1 |
| 162 | \& my $version = Compress::Raw::Bzip2::bzlibversion(); |
| 163 | .Ve |
| 164 | .SH "DESCRIPTION" |
| 165 | .IX Header "DESCRIPTION" |
| 166 | \&\f(CW\*(C`Compress::Raw::Bzip2\*(C'\fR provides an interface to the in-memory |
| 167 | compression/uncompression functions from the bzip2 compression library. |
| 168 | .PP |
| 169 | Although the primary purpose for the existence of \f(CW\*(C`Compress::Raw::Bzip2\*(C'\fR |
| 170 | is for use by the \f(CW\*(C`IO::Compress::Bzip2\*(C'\fR and \f(CW\*(C`IO::Compress::Bunzip2\*(C'\fR |
| 171 | modules, it can be used on its own for simple compression/uncompression |
| 172 | tasks. |
| 173 | .SH "Compression" |
| 174 | .IX Header "Compression" |
| 175 | .ie n .Sh "($z, $status\fP) = new Compress::Raw::Bzip2 \f(CW$appendOutput\fP, \f(CW$blockSize100k\fP, \f(CW$workfactor;" |
| 176 | .el .Sh "($z, \f(CW$status\fP) = new Compress::Raw::Bzip2 \f(CW$appendOutput\fP, \f(CW$blockSize100k\fP, \f(CW$workfactor\fP;" |
| 177 | .IX Subsection "($z, $status) = new Compress::Raw::Bzip2 $appendOutput, $blockSize100k, $workfactor;" |
| 178 | Creates a new compression object. |
| 179 | .PP |
| 180 | If successful, it will return the initialised compression object, \f(CW$z\fR |
| 181 | and a \f(CW$status\fR of \f(CW\*(C`BZ_OK\*(C'\fR in a list context. In scalar context it |
| 182 | returns the deflation object, \f(CW$z\fR, only. |
| 183 | .PP |
| 184 | If not successful, the returned compression object, \f(CW$z\fR, will be |
| 185 | \&\fIundef\fR and \f(CW$status\fR will hold the a \fIbzip2\fR error code. |
| 186 | .PP |
| 187 | Below is a list of the valid options: |
| 188 | .IP "\fB$appendOutput\fR" 5 |
| 189 | .IX Item "$appendOutput" |
| 190 | Controls whether the compressed data is appended to the output buffer in |
| 191 | the \f(CW\*(C`bzdeflate\*(C'\fR, \f(CW\*(C`bzflush\*(C'\fR and \f(CW\*(C`bzclose\*(C'\fR methods. |
| 192 | .Sp |
| 193 | Defaults to 1. |
| 194 | .IP "\fB$blockSize100k\fR" 5 |
| 195 | .IX Item "$blockSize100k" |
| 196 | To quote the bzip2 documentation |
| 197 | .Sp |
| 198 | .Vb 4 |
| 199 | \& blockSize100k specifies the block size to be used for compression. It |
| 200 | \& should be a value between 1 and 9 inclusive, and the actual block size |
| 201 | \& used is 100000 x this figure. 9 gives the best compression but takes |
| 202 | \& most memory. |
| 203 | .Ve |
| 204 | .Sp |
| 205 | Defaults to 1. |
| 206 | .IP "\fB$workfactor\fR" 5 |
| 207 | .IX Item "$workfactor" |
| 208 | To quote the bzip2 documentation |
| 209 | .Sp |
| 210 | .Vb 7 |
| 211 | \& This parameter controls how the compression phase behaves when |
| 212 | \& presented with worst case, highly repetitive, input data. If |
| 213 | \& compression runs into difficulties caused by repetitive data, the |
| 214 | \& library switches from the standard sorting algorithm to a fallback |
| 215 | \& algorithm. The fallback is slower than the standard algorithm by |
| 216 | \& perhaps a factor of three, but always behaves reasonably, no matter how |
| 217 | \& bad the input. |
| 218 | .Ve |
| 219 | .Sp |
| 220 | .Vb 7 |
| 221 | \& Lower values of workFactor reduce the amount of effort the standard |
| 222 | \& algorithm will expend before resorting to the fallback. You should set |
| 223 | \& this parameter carefully; too low, and many inputs will be handled by |
| 224 | \& the fallback algorithm and so compress rather slowly, too high, and |
| 225 | \& your average\-to\-worst case compression times can become very large. The |
| 226 | \& default value of 30 gives reasonable behaviour over a wide range of |
| 227 | \& circumstances. |
| 228 | .Ve |
| 229 | .Sp |
| 230 | .Vb 2 |
| 231 | \& Allowable values range from 0 to 250 inclusive. 0 is a special case, |
| 232 | \& equivalent to using the default value of 30. |
| 233 | .Ve |
| 234 | .Sp |
| 235 | Defaults to 0. |
| 236 | .ie n .Sh "$status = $bz\fP\->bzdeflate($input, \f(CW$output);" |
| 237 | .el .Sh "$status = \f(CW$bz\fP\->bzdeflate($input, \f(CW$output\fP);" |
| 238 | .IX Subsection "$status = $bz->bzdeflate($input, $output);" |
| 239 | Reads the contents of \f(CW$input\fR, compresses it and writes the compressed |
| 240 | data to \f(CW$output\fR. |
| 241 | .PP |
| 242 | Returns \f(CW\*(C`BZ_RUN_OK\*(C'\fR on success and a \f(CW\*(C`bzip2\*(C'\fR error code on failure. |
| 243 | .PP |
| 244 | If \f(CW\*(C`appendOutput\*(C'\fR is enabled in the constructor for the bzip2 object, the |
| 245 | compressed data will be appended to \f(CW$output\fR. If not enabled, \f(CW$output\fR |
| 246 | will be truncated before the compressed data is written to it. |
| 247 | .ie n .Sh "$status = $bz\->bzflush($output);" |
| 248 | .el .Sh "$status = \f(CW$bz\fP\->bzflush($output);" |
| 249 | .IX Subsection "$status = $bz->bzflush($output);" |
| 250 | Flushes any pending compressed data to \f(CW$output\fR. |
| 251 | .PP |
| 252 | Returns \f(CW\*(C`BZ_RUN_OK\*(C'\fR on success and a \f(CW\*(C`bzip2\*(C'\fR error code on failure. |
| 253 | .ie n .Sh "$status = $bz\->bzclose($output);" |
| 254 | .el .Sh "$status = \f(CW$bz\fP\->bzclose($output);" |
| 255 | .IX Subsection "$status = $bz->bzclose($output);" |
| 256 | Terminates the compressed data stream and flushes any pending compressed |
| 257 | data to \f(CW$output\fR. |
| 258 | .PP |
| 259 | Returns \f(CW\*(C`BZ_STREAM_END\*(C'\fR on success and a \f(CW\*(C`bzip2\*(C'\fR error code on failure. |
| 260 | .Sh "Example" |
| 261 | .IX Subsection "Example" |
| 262 | .SH "Uncompression" |
| 263 | .IX Header "Uncompression" |
| 264 | .ie n .Sh "($z, $status\fP) = new Compress::Raw::Bunzip2 \f(CW$appendOutput\fP, \f(CW$consumeInput\fP, \f(CW$small\fP, \f(CW$limitOutput;" |
| 265 | .el .Sh "($z, \f(CW$status\fP) = new Compress::Raw::Bunzip2 \f(CW$appendOutput\fP, \f(CW$consumeInput\fP, \f(CW$small\fP, \f(CW$limitOutput\fP;" |
| 266 | .IX Subsection "($z, $status) = new Compress::Raw::Bunzip2 $appendOutput, $consumeInput, $small, $limitOutput;" |
| 267 | If successful, it will return the initialised uncompression object, \f(CW$z\fR |
| 268 | and a \f(CW$status\fR of \f(CW\*(C`BZ_OK\*(C'\fR in a list context. In scalar context it |
| 269 | returns the deflation object, \f(CW$z\fR, only. |
| 270 | .PP |
| 271 | If not successful, the returned uncompression object, \f(CW$z\fR, will be |
| 272 | \&\fIundef\fR and \f(CW$status\fR will hold the a \fIbzip2\fR error code. |
| 273 | .PP |
| 274 | Below is a list of the valid options: |
| 275 | .IP "\fB$appendOutput\fR" 5 |
| 276 | .IX Item "$appendOutput" |
| 277 | Controls whether the compressed data is appended to the output buffer in the |
| 278 | \&\f(CW\*(C`bzinflate\*(C'\fR, \f(CW\*(C`bzflush\*(C'\fR and \f(CW\*(C`bzclose\*(C'\fR methods. |
| 279 | .Sp |
| 280 | Defaults to 1. |
| 281 | .IP "\fB$consumeInput\fR" 5 |
| 282 | .IX Item "$consumeInput" |
| 283 | .PD 0 |
| 284 | .IP "\fB$small\fR" 5 |
| 285 | .IX Item "$small" |
| 286 | .PD |
| 287 | To quote the bzip2 documentation |
| 288 | .Sp |
| 289 | .Vb 4 |
| 290 | \& If small is nonzero, the library will use an alternative decompression |
| 291 | \& algorithm which uses less memory but at the cost of decompressing more |
| 292 | \& slowly (roughly speaking, half the speed, but the maximum memory |
| 293 | \& requirement drops to around 2300k). |
| 294 | .Ve |
| 295 | .Sp |
| 296 | Defaults to 0. |
| 297 | .IP "\fB$limitOutput\fR" 5 |
| 298 | .IX Item "$limitOutput" |
| 299 | The \f(CW\*(C`LimitOutput\*(C'\fR option changes the behavior of the \f(CW\*(C`$i\->bzinflate\*(C'\fR |
| 300 | method so that the amount of memory used by the output buffer can be |
| 301 | limited. |
| 302 | .Sp |
| 303 | When \f(CW\*(C`LimitOutput\*(C'\fR is used the size of the output buffer used will either |
| 304 | be the 16k or the amount of memory already allocated to \f(CW$output\fR, |
| 305 | whichever is larger. Predicting the output size available is tricky, so |
| 306 | don't rely on getting an exact output buffer size. |
| 307 | .Sp |
| 308 | When \f(CW\*(C`LimitOutout\*(C'\fR is not specified \f(CW\*(C`$i\->bzinflate\*(C'\fR will use as much |
| 309 | memory as it takes to write all the uncompressed data it creates by |
| 310 | uncompressing the input buffer. |
| 311 | .Sp |
| 312 | If \f(CW\*(C`LimitOutput\*(C'\fR is enabled, the \f(CW\*(C`ConsumeInput\*(C'\fR option will also be |
| 313 | enabled. |
| 314 | .Sp |
| 315 | This option defaults to false. |
| 316 | .ie n .Sh "$status = $z\fP\->bzinflate($input, \f(CW$output);" |
| 317 | .el .Sh "$status = \f(CW$z\fP\->bzinflate($input, \f(CW$output\fP);" |
| 318 | .IX Subsection "$status = $z->bzinflate($input, $output);" |
| 319 | Uncompresses \f(CW$input\fR and writes the uncompressed data to \f(CW$output\fR. |
| 320 | .PP |
| 321 | Returns \f(CW\*(C`BZ_OK\*(C'\fR if the uncompression was successful, but the end of the |
| 322 | compressed data stream has not been reached. Returns \f(CW\*(C`BZ_STREAM_END\*(C'\fR on |
| 323 | successful uncompression and the end of the compression stream has been |
| 324 | reached. |
| 325 | .PP |
| 326 | If \f(CW\*(C`consumeInput\*(C'\fR is enabled in the constructor for the bunzip2 object, |
| 327 | \&\f(CW$input\fR will have all compressed data removed from it after |
| 328 | uncompression. On \f(CW\*(C`BZ_OK\*(C'\fR return this will mean that \f(CW$input\fR will be an |
| 329 | empty string; when \f(CW\*(C`BZ_STREAM_END\*(C'\fR \f(CW$input\fR will either be an empty |
| 330 | string or will contain whatever data immediately followed the compressed |
| 331 | data stream. |
| 332 | .PP |
| 333 | If \f(CW\*(C`appendOutput\*(C'\fR is enabled in the constructor for the bunzip2 object, |
| 334 | the uncompressed data will be appended to \f(CW$output\fR. If not enabled, |
| 335 | \&\f(CW$output\fR will be truncated before the uncompressed data is written to it. |
| 336 | .SH "Misc" |
| 337 | .IX Header "Misc" |
| 338 | .ie n .Sh "my $version\fP = \fICompress::Raw::Bzip2::bzlibversion();" |
| 339 | .el .Sh "my \f(CW$version\fP = \fICompress::Raw::Bzip2::bzlibversion()\fP;" |
| 340 | .IX Subsection "my $version = Compress::Raw::Bzip2::bzlibversion();" |
| 341 | Returns the version of the underlying bzip2 library. |
| 342 | .SH "Constants" |
| 343 | .IX Header "Constants" |
| 344 | The following bzip2 constants are exported by this module |
| 345 | .PP |
| 346 | .Vb 3 |
| 347 | \& BZ_RUN |
| 348 | \& BZ_FLUSH |
| 349 | \& BZ_FINISH |
| 350 | .Ve |
| 351 | .PP |
| 352 | .Vb 14 |
| 353 | \& BZ_OK |
| 354 | \& BZ_RUN_OK |
| 355 | \& BZ_FLUSH_OK |
| 356 | \& BZ_FINISH_OK |
| 357 | \& BZ_STREAM_END |
| 358 | \& BZ_SEQUENCE_ERROR |
| 359 | \& BZ_PARAM_ERROR |
| 360 | \& BZ_MEM_ERROR |
| 361 | \& BZ_DATA_ERROR |
| 362 | \& BZ_DATA_ERROR_MAGIC |
| 363 | \& BZ_IO_ERROR |
| 364 | \& BZ_UNEXPECTED_EOF |
| 365 | \& BZ_OUTBUFF_FULL |
| 366 | \& BZ_CONFIG_ERROR |
| 367 | .Ve |
| 368 | .SH "SEE ALSO" |
| 369 | .IX Header "SEE ALSO" |
| 370 | Compress::Zlib, IO::Compress::Gzip, IO::Uncompress::Gunzip, IO::Compress::Deflate, IO::Uncompress::Inflate, IO::Compress::RawDeflate, IO::Uncompress::RawInflate, IO::Compress::Bzip2, IO::Uncompress::Bunzip2, IO::Compress::Lzma, IO::Uncompress::UnLzma, IO::Compress::Xz, IO::Uncompress::UnXz, IO::Compress::Lzop, IO::Uncompress::UnLzop, IO::Compress::Lzf, IO::Uncompress::UnLzf, IO::Uncompress::AnyInflate, IO::Uncompress::AnyUncompress |
| 371 | .PP |
| 372 | Compress::Zlib::FAQ |
| 373 | .PP |
| 374 | File::GlobMapper, Archive::Zip, |
| 375 | Archive::Tar, |
| 376 | IO::Zlib |
| 377 | .PP |
| 378 | The primary site for the bzip2 program is \fIhttp://www.bzip.org\fR. |
| 379 | .PP |
| 380 | See the module Compress::Bzip2 |
| 381 | .SH "AUTHOR" |
| 382 | .IX Header "AUTHOR" |
| 383 | This module was written by Paul Marquess, \fIpmqs@cpan.org\fR. |
| 384 | .SH "MODIFICATION HISTORY" |
| 385 | .IX Header "MODIFICATION HISTORY" |
| 386 | See the Changes file. |
| 387 | .SH "COPYRIGHT AND LICENSE" |
| 388 | .IX Header "COPYRIGHT AND LICENSE" |
| 389 | Copyright (c) 2005\-2009 Paul Marquess. All rights reserved. |
| 390 | .PP |
| 391 | This program is free software; you can redistribute it and/or |
| 392 | modify it under the same terms as Perl itself. |
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