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.\" ========================================================================
.\"
.IX Title "BackupPC::XS 3pm"
.TH BackupPC::XS 3pm "2020-11-08" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
BackupPC::XS \- Perl extension for BackupPC libraries
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  use BackupPC::XS;
\&  use BackupPC::XS qw( :all );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
BackupPC::XS provides various submodules that implement various BackupPC library functions.
The following sections describe each submodule.
.PP
This documentation is very terse.  BackupPC::XS is not intended to be a general-purpose
module \- it is closely tied to BackupPC.  Look in the BackupPC code to see examples of
using this module.
.SS "BackupPC::XS::FileZIO"
.IX Subsection "BackupPC::XS::FileZIO"
Compressed file I/O using zlib:
.PP
.Vb 8
\&    $fd = BackupPC::XS::FileZIO::open($fileName, $writeFlag, $compressLevel);
\&    $fd = BackupPC::XS::FileZIO::fdopen($stream, $writeFlag, $compressLevel);
\&    $nWrite   = $fd\->write($dataRef);
\&    $nRead    = $fd\->read($dataRef, $maxRead);
\&    $textLine = $fd\->readLine();
\&    $fd\->rewind();
\&    $fd\->close();
\&    $fd\->writeTeeStderr($boolean);
.Ve
.SS "BackupPC::XS::PoolRefCnt"
.IX Subsection "BackupPC::XS::PoolRefCnt"
Pool file reference counting:
.PP
.Vb 9
\&    $countDB = BackupPC::XS::PoolRefCnt::new(initialEntryCnt);
\&    $refCount = $countDB\->get($digest);
\&    $countDB\->set($digest, $refCount);
\&    $countDB\->delete($digest);
\&    $countDB\->incr($digest, $refIncr);
\&    ($digest, $refCnt, $idx) = $countDB\->iterate($idx);
\&    $countDB\->read($fileName);
\&    $countDB\->write($fileName);
\&    $countDB\->print();
.Ve
.PP
Pool file delta accumulation:
.PP
.Vb 4
\&    BackupPC::XS::PoolRefCnt::DeltaFileInit($hostDir);
\&    BackupPC::XS::PoolRefCnt::DeltaFileFlush();
\&    BackupPC::XS::PoolRefCnt::DeltaUpdate($digest, $refIncr);
\&    BackupPC::XS::PoolRefCnt::DeltaPrint();
.Ve
.SS "BackupPC::XS::PoolWrite"
.IX Subsection "BackupPC::XS::PoolWrite"
Writing and matching files in the pool:
.PP
.Vb 4
\&    $poolWrite = BackupPC::XS::PoolWrite::new($compressLevel [, $digest]);
\&    $poolWrite\->write($dataRef);
\&    ($match, $digest, $poolSize, $error) = $poolWrite\->close();
\&    $poolWrite\->addToPool($fileName, $isV3PoolFile);
.Ve
.SS "BackupPC::XS::Attrib"
.IX Subsection "BackupPC::XS::Attrib"
Manipulating a set of files and attributes (typically one directory's worth):
.PP
.Vb 6
\&    $a = BackupPC::XS::Attrib::new($compressLevel);
\&    $attrHash = $a\->get($fileName);
\&    $a\->set($fileName, $attrHash);
\&    $numDirEntries = $a\->count();
\&    $a\->read($dirPath, $attribFileName);
\&    $a\->write($dirPath, $attribFileName);
\&
\&    $textType = BackupPC::XS::Attrib::fileType2Text(BPC_FTYPE_....);
.Ve
.SS "BackupPC::XS::AttribCache"
.IX Subsection "BackupPC::XS::AttribCache"
Maintain a cache of directories, with full share/path semantics.
.PP
.Vb 1
\&    $ac = BackupPC::XS::AttribCache::new($host, $backupNum, $shareNameUM, $compress);
\&
\&    $attrHash = $ac\->get($fileName, $allocateIfMissing, $dontReadInode);
\&    $ac\->set($fileName, $attrHash, $dontOverwriteInode);
\&    $ac\->delete($fileName);
\&
\&    $attrHash = $ac\->getInode($inode, $allocateIfMissing);
\&    $ac\->setInode($inode, $attrHash);
\&    $ac\->deleteInode($inode);
\&
\&    $ac\->getAll($path, $dontReadInode);
\&
\&    $ac\->flush($all, $path);
\&    $ac\->getFullMangledPath($path);
.Ve
.SS "BackupPC::XS::DirOps"
.IX Subsection "BackupPC::XS::DirOps"
.Vb 2
\&    $zeroMeansOk = BackupPC::XS::DirOps::path_create($path);
\&    $errorCnt = BackupPC::XS::DirOps::path_remove($path, $compress);
\&
\&    $errorCnt = BackupPC::XS::DirOps::refCountAll($path, $compress);
\&
\&    $lockFd = BackupPC::XS::DirOps::lockRangeFile($lockFile, $offset, $len, $block);
\&    BackupPC::XS::DirOps::unlockRangeFile($lockFd);
.Ve
.SS "BackupPC::XS::Lib"
.IX Subsection "BackupPC::XS::Lib"
.Vb 1
\&    BackupPC::XS::Lib::ConfInit($topDir, $hardLinkMax, $poolV3Enabled, $logLevel)
\&
\&    $messageArrayRef = BackupPC::XS::Lib::logMsgGet();
\&    $errorCnt = BackupPC::XS::Lib::logErrorCntGet;
\&    BackupPC::XS::Lib::logLevelSet($level);
.Ve
.SH "EXPORTS"
.IX Header "EXPORTS"
If you specify :all (see \s-1SYNOPSIS\s0), then the \s-1BPC_FTYPE_\s0 values are exported.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
BackupPC, backuppc.sourceforge.net.
.PP
rsync-bpc.
.SH "AUTHOR"
.IX Header "AUTHOR"
Craig Barratt, <cbarratt@users.sourceforge.net<gt>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
BackupPC code is copyright (C) 2013\-2017 Craig Barratt
<cbarratt@users.sourceforge.net>.
.PP
bpc_hashTable.c is based on code from rsync.  Rsync is Copyright
(C) 1996\-2001 by Andrew Tridgell, 1996 by Paul Mackerras, 2001\-2002
by Martin Pool, and 2003\-2009 by Wayne Davison, and others.
.PP
The md5 library is from the rsync codebase, and is Copyright (C) 2001\-2003
Christophe Devine.  See the code for the license.
.PP
The zlib library is from the rsync codebase, and is Copyright (C) 1995\-2005
Jean-loup Gailly and Mark Adler.  See the code for the license.
.PP
This program is free software; you can redistribute it and/or modify
it under the terms of the \s-1GNU\s0 General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
.PP
This program is distributed in the hope that it will be useful,
but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0  See the
\&\s-1GNU\s0 General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 General Public License along
with this program; if not, visit the http://fsf.org website.