| 1 |
dpavlin |
1 |
#============================================================= -*-perl-*- |
| 2 |
|
|
# |
| 3 |
|
|
# BackupPC::FileZIO package |
| 4 |
|
|
# |
| 5 |
|
|
# DESCRIPTION |
| 6 |
|
|
# |
| 7 |
|
|
# This library defines a BackupPC::FileZIO class for doing |
| 8 |
|
|
# compressed or normal file I/O. |
| 9 |
|
|
# |
| 10 |
|
|
# AUTHOR |
| 11 |
|
|
# Craig Barratt <cbarratt@users.sourceforge.net> |
| 12 |
|
|
# |
| 13 |
|
|
# COPYRIGHT |
| 14 |
|
|
# Copyright (C) 2001-2003 Craig Barratt |
| 15 |
|
|
# |
| 16 |
|
|
# This program is free software; you can redistribute it and/or modify |
| 17 |
|
|
# it under the terms of the GNU General Public License as published by |
| 18 |
|
|
# the Free Software Foundation; either version 2 of the License, or |
| 19 |
|
|
# (at your option) any later version. |
| 20 |
|
|
# |
| 21 |
|
|
# This program is distributed in the hope that it will be useful, |
| 22 |
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 |
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 |
|
|
# GNU General Public License for more details. |
| 25 |
|
|
# |
| 26 |
|
|
# You should have received a copy of the GNU General Public License |
| 27 |
|
|
# along with this program; if not, write to the Free Software |
| 28 |
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 29 |
|
|
# |
| 30 |
|
|
#======================================================================== |
| 31 |
|
|
# |
| 32 |
|
|
# Version 2.1.0, released 20 Jun 2004. |
| 33 |
|
|
# |
| 34 |
|
|
# See http://backuppc.sourceforge.net. |
| 35 |
|
|
# |
| 36 |
|
|
#======================================================================== |
| 37 |
|
|
|
| 38 |
|
|
package BackupPC::FileZIO; |
| 39 |
|
|
|
| 40 |
|
|
use strict; |
| 41 |
|
|
|
| 42 |
|
|
use vars qw( $CompZlibOK ); |
| 43 |
|
|
use Carp; |
| 44 |
|
|
use File::Path; |
| 45 |
|
|
use File::Copy; |
| 46 |
|
|
|
| 47 |
|
|
# |
| 48 |
|
|
# For compressed files we have a to careful about running out of memory |
| 49 |
|
|
# when we inflate a deflated file. For example, if a 500MB file of all |
| 50 |
|
|
# zero-bytes is compressed, it will only occupy a few tens of kbytes. If |
| 51 |
|
|
# we read the compressed file in decent-size chunks, a single inflate |
| 52 |
|
|
# will try to allocate 500MB. Not a good idea. |
| 53 |
|
|
# |
| 54 |
|
|
# Instead, we compress the file in chunks of $CompMaxWrite. If a |
| 55 |
|
|
# deflated chunk produces less than $CompMaxRead bytes, then we flush |
| 56 |
|
|
# and continue. This adds a few bytes to the compressed output file, but |
| 57 |
|
|
# only in extreme cases where the compression ratio is very close to |
| 58 |
|
|
# 100%. The result is that, provided we read the compressed file in |
| 59 |
|
|
# chunks of $CompMaxRead or less, the biggest inflated data will be |
| 60 |
|
|
# $CompMaxWrite. |
| 61 |
|
|
# |
| 62 |
|
|
my $CompMaxRead = 131072; # 128K |
| 63 |
|
|
my $CompMaxWrite = 6291456; # 6MB |
| 64 |
|
|
|
| 65 |
|
|
# |
| 66 |
|
|
# We maintain a write buffer for small writes for both compressed and |
| 67 |
|
|
# uncompressed files. This is the size of the write buffer. |
| 68 |
|
|
# |
| 69 |
|
|
my $WriteBufSize = 65536; |
| 70 |
|
|
|
| 71 |
|
|
BEGIN { |
| 72 |
|
|
eval "use Compress::Zlib;"; |
| 73 |
|
|
if ( $@ ) { |
| 74 |
|
|
# |
| 75 |
|
|
# Compress::Zlib doesn't exist. Define some dummy constant |
| 76 |
|
|
# subs so that the code below doesn't barf. |
| 77 |
|
|
# |
| 78 |
|
|
eval { |
| 79 |
|
|
sub Z_OK { return 0; } |
| 80 |
|
|
sub Z_STREAM_END { return 1; } |
| 81 |
|
|
}; |
| 82 |
|
|
$CompZlibOK = 0; |
| 83 |
|
|
} else { |
| 84 |
|
|
$CompZlibOK = 1; |
| 85 |
|
|
} |
| 86 |
|
|
}; |
| 87 |
|
|
|
| 88 |
|
|
sub open |
| 89 |
|
|
{ |
| 90 |
|
|
my($class, $fileName, $write, $compLevel) = @_; |
| 91 |
|
|
local(*FH); |
| 92 |
|
|
my($fh); |
| 93 |
|
|
|
| 94 |
|
|
if ( ref(\$fileName) eq "GLOB" ) { |
| 95 |
|
|
$fh = $fileName; |
| 96 |
|
|
} else { |
| 97 |
|
|
if ( $write ) { |
| 98 |
|
|
open(FH, ">", $fileName) || return; |
| 99 |
|
|
} else { |
| 100 |
|
|
open(FH, "<", $fileName) || return; |
| 101 |
|
|
} |
| 102 |
|
|
binmode(FH); |
| 103 |
|
|
$fh = *FH; |
| 104 |
|
|
} |
| 105 |
|
|
$compLevel = 0 if ( !$CompZlibOK ); |
| 106 |
|
|
my $self = bless { |
| 107 |
|
|
fh => $fh, |
| 108 |
|
|
name => $fileName, |
| 109 |
|
|
write => $write, |
| 110 |
|
|
writeZeroCnt => 0, |
| 111 |
|
|
compress => $compLevel, |
| 112 |
|
|
}, $class; |
| 113 |
|
|
if ( $compLevel ) { |
| 114 |
|
|
if ( $write ) { |
| 115 |
|
|
$self->{deflate} = $self->myDeflateInit; |
| 116 |
|
|
} else { |
| 117 |
|
|
$self->{inflate} = $self->myInflateInit; |
| 118 |
|
|
$self->{inflateStart} = 1; |
| 119 |
|
|
} |
| 120 |
|
|
} |
| 121 |
|
|
return $self; |
| 122 |
|
|
} |
| 123 |
|
|
|
| 124 |
|
|
sub compOk |
| 125 |
|
|
{ |
| 126 |
|
|
return $CompZlibOK; |
| 127 |
|
|
} |
| 128 |
|
|
|
| 129 |
|
|
sub myDeflateInit |
| 130 |
|
|
{ |
| 131 |
|
|
my $self = shift; |
| 132 |
|
|
|
| 133 |
|
|
return deflateInit( |
| 134 |
|
|
-Bufsize => 65536, |
| 135 |
|
|
-Level => $self->{compress}, |
| 136 |
|
|
); |
| 137 |
|
|
} |
| 138 |
|
|
|
| 139 |
|
|
sub myInflateInit |
| 140 |
|
|
{ |
| 141 |
|
|
my $self = shift; |
| 142 |
|
|
|
| 143 |
|
|
return inflateInit( |
| 144 |
|
|
-Bufsize => 65536, |
| 145 |
|
|
); |
| 146 |
|
|
} |
| 147 |
|
|
|
| 148 |
|
|
sub read |
| 149 |
|
|
{ |
| 150 |
|
|
my($self, $dataRef, $nRead) = @_; |
| 151 |
|
|
my($n); |
| 152 |
|
|
|
| 153 |
|
|
return if ( $self->{write} ); |
| 154 |
|
|
return sysread($self->{fh}, $$dataRef, $nRead) if ( !$self->{compress} ); |
| 155 |
|
|
while ( !$self->{eof} && $nRead > length($self->{dataOut}) ) { |
| 156 |
|
|
if ( !length($self->{dataIn}) ) { |
| 157 |
|
|
$n = sysread($self->{fh}, $self->{dataIn}, $CompMaxRead); |
| 158 |
|
|
return $n if ( $n < 0 ); |
| 159 |
|
|
$self->{eof} = 1 if ( $n == 0 ); |
| 160 |
|
|
} |
| 161 |
|
|
if ( $self->{inflateStart} && $self->{dataIn} ne "" ) { |
| 162 |
|
|
my $chr = substr($self->{dataIn}, 0, 1); |
| 163 |
|
|
|
| 164 |
|
|
$self->{inflateStart} = 0; |
| 165 |
|
|
if ( $chr eq chr(0xd6) ) { |
| 166 |
|
|
# |
| 167 |
|
|
# Flag 0xd6 means this is a compressed file with |
| 168 |
|
|
# appended md4 block checksums for rsync. Change |
| 169 |
|
|
# the first byte back to 0x78 and proceed. |
| 170 |
|
|
# |
| 171 |
|
|
##print("Got 0xd6 block: normal\n"); |
| 172 |
|
|
substr($self->{dataIn}, 0, 1) = chr(0x78); |
| 173 |
|
|
} elsif ( $chr eq chr(0xb3) ) { |
| 174 |
|
|
# |
| 175 |
|
|
# Flag 0xb3 means this is the start of the rsync |
| 176 |
|
|
# block checksums, so consider this as EOF for |
| 177 |
|
|
# the compressed file. Also seek the file so |
| 178 |
|
|
# it is positioned at the 0xb3. |
| 179 |
|
|
# |
| 180 |
|
|
sysseek($self->{fh}, -length($self->{dataIn}), 1); |
| 181 |
|
|
$self->{eof} = 1; |
| 182 |
|
|
$self->{dataIn} = ""; |
| 183 |
|
|
##print("Got 0xb3 block: considering eof\n"); |
| 184 |
|
|
last; |
| 185 |
|
|
} else { |
| 186 |
|
|
# |
| 187 |
|
|
# normal case: nothing to do |
| 188 |
|
|
# |
| 189 |
|
|
} |
| 190 |
|
|
} |
| 191 |
|
|
my($data, $err) = $self->{inflate}->inflate($self->{dataIn}); |
| 192 |
|
|
$self->{dataOut} .= $data; |
| 193 |
|
|
if ( $err == Z_STREAM_END ) { |
| 194 |
|
|
#print("R"); |
| 195 |
|
|
$self->{inflate} = $self->myInflateInit; |
| 196 |
|
|
$self->{inflateStart} = 1; |
| 197 |
|
|
} elsif ( $err != Z_OK ) { |
| 198 |
|
|
$$dataRef = ""; |
| 199 |
|
|
return -1; |
| 200 |
|
|
} |
| 201 |
|
|
} |
| 202 |
|
|
if ( $nRead >= length($self->{dataOut}) ) { |
| 203 |
|
|
$n = length($self->{dataOut}); |
| 204 |
|
|
$$dataRef = $self->{dataOut}; |
| 205 |
|
|
$self->{dataOut} = ''; |
| 206 |
|
|
return $n; |
| 207 |
|
|
} else { |
| 208 |
|
|
$$dataRef = substr($self->{dataOut}, 0, $nRead); |
| 209 |
|
|
$self->{dataOut} = substr($self->{dataOut}, $nRead); |
| 210 |
|
|
return $nRead; |
| 211 |
|
|
} |
| 212 |
|
|
} |
| 213 |
|
|
|
| 214 |
|
|
# |
| 215 |
|
|
# Provide a line-at-a-time interface. This splits and buffers the |
| 216 |
|
|
# lines, you cannot mix calls to read() and readLine(). |
| 217 |
|
|
# |
| 218 |
|
|
sub readLine |
| 219 |
|
|
{ |
| 220 |
|
|
my($self) = @_; |
| 221 |
|
|
my $str; |
| 222 |
|
|
|
| 223 |
|
|
$self->{readLineBuf} = [] if ( !defined($self->{readLineBuf}) ); |
| 224 |
|
|
while ( !@{$self->{readLineBuf}} ) { |
| 225 |
|
|
$self->read(\$str, $CompMaxRead); |
| 226 |
|
|
if ( $str eq "" ) { |
| 227 |
|
|
$str = $self->{readLineFrag}; |
| 228 |
|
|
$self->{readLineFrag} = ""; |
| 229 |
|
|
return $str; |
| 230 |
|
|
} |
| 231 |
|
|
@{$self->{readLineBuf}} = split(/\n/, $self->{readLineFrag} . $str); |
| 232 |
|
|
if ( substr($str, -1, 1) ne "\n" ) { |
| 233 |
|
|
$self->{readLineFrag} = pop(@{$self->{readLineBuf}}); |
| 234 |
|
|
} else { |
| 235 |
|
|
$self->{readLineFrag} = ""; |
| 236 |
|
|
} |
| 237 |
|
|
} |
| 238 |
|
|
return shift(@{$self->{readLineBuf}}) . "\n"; |
| 239 |
|
|
} |
| 240 |
|
|
|
| 241 |
|
|
sub rewind |
| 242 |
|
|
{ |
| 243 |
|
|
my($self) = @_; |
| 244 |
|
|
|
| 245 |
|
|
return if ( $self->{write} ); |
| 246 |
|
|
return sysseek($self->{fh}, 0, 0) if ( !$self->{compress} ); |
| 247 |
|
|
$self->{dataOut} = ''; |
| 248 |
|
|
$self->{dataIn} = ''; |
| 249 |
|
|
$self->{eof} = 0; |
| 250 |
|
|
$self->{inflate} = $self->myInflateInit; |
| 251 |
|
|
$self->{inflateStart} = 1; |
| 252 |
|
|
return sysseek($self->{fh}, 0, 0); |
| 253 |
|
|
} |
| 254 |
|
|
|
| 255 |
|
|
sub writeBuffered |
| 256 |
|
|
{ |
| 257 |
|
|
my $self = shift; |
| 258 |
|
|
my($data, $force) = @_; |
| 259 |
|
|
|
| 260 |
|
|
# |
| 261 |
|
|
# Buffer small writes using a buffer size of up to $WriteBufSize. |
| 262 |
|
|
# |
| 263 |
|
|
if ( $force || length($self->{writeBuf}) + length($data) > $WriteBufSize ) { |
| 264 |
|
|
if ( length($self->{writeBuf}) ) { |
| 265 |
|
|
my $wrData = $self->{writeBuf} . $data; |
| 266 |
|
|
return -1 if ( syswrite($self->{fh}, $wrData) != length($wrData) ); |
| 267 |
|
|
$self->{writeBuf} = undef; |
| 268 |
|
|
} else { |
| 269 |
|
|
return if ( length($data) == 0 ); |
| 270 |
|
|
return -1 if ( syswrite($self->{fh}, $data) != length($data) ); |
| 271 |
|
|
} |
| 272 |
|
|
} else { |
| 273 |
|
|
$self->{writeBuf} .= $data; |
| 274 |
|
|
} |
| 275 |
|
|
return 0; |
| 276 |
|
|
} |
| 277 |
|
|
|
| 278 |
|
|
sub write |
| 279 |
|
|
{ |
| 280 |
|
|
my($self, $dataRef) = @_; |
| 281 |
|
|
my $n = length($$dataRef); |
| 282 |
|
|
|
| 283 |
|
|
return if ( !$self->{write} ); |
| 284 |
|
|
print(STDERR $$dataRef) if ( $self->{writeTeeStderr} ); |
| 285 |
|
|
return 0 if ( $n == 0 ); |
| 286 |
|
|
if ( !$self->{compress} ) { |
| 287 |
|
|
# |
| 288 |
|
|
# If smbclient gets a read error on the client (due to a file lock) |
| 289 |
|
|
# it will write a dummy file of zeros. We detect this so we can |
| 290 |
|
|
# store the file efficiently as a sparse file. writeZeroCnt is |
| 291 |
|
|
# the number of consecutive 0 bytes at the start of the file. |
| 292 |
|
|
# |
| 293 |
|
|
my $skip = 0; |
| 294 |
|
|
if ( $self->{writeZeroCnt} >= 0 && $$dataRef =~ /^(\0+)/s ) { |
| 295 |
|
|
$skip = length($1); |
| 296 |
|
|
$self->{writeZeroCnt} += $skip; |
| 297 |
|
|
return $n if ( $skip == $n ); |
| 298 |
|
|
} |
| 299 |
|
|
# |
| 300 |
|
|
# We now have some non-zero bytes, so time to seek to the right |
| 301 |
|
|
# place and turn off zero-byte detection. |
| 302 |
|
|
# |
| 303 |
|
|
if ( $self->{writeZeroCnt} > 0 ) { |
| 304 |
|
|
sysseek($self->{fh}, $self->{writeZeroCnt}, 0); |
| 305 |
|
|
$self->{writeZeroCnt} = -1; |
| 306 |
|
|
} elsif ( $self->{writeZeroCnt} == 0 ) { |
| 307 |
|
|
$self->{writeZeroCnt} = -1; |
| 308 |
|
|
} |
| 309 |
|
|
return -1 if ( $self->writeBuffered(substr($$dataRef, $skip)) < 0 ); |
| 310 |
|
|
return $n; |
| 311 |
|
|
} |
| 312 |
|
|
for ( my $i = 0 ; $i < $n ; $i += $CompMaxWrite ) { |
| 313 |
|
|
my $dataIn = substr($$dataRef, $i, $CompMaxWrite); |
| 314 |
|
|
my $dataOut = $self->{deflate}->deflate($dataIn); |
| 315 |
|
|
return -1 if ( $self->writeBuffered($dataOut) < 0 ); |
| 316 |
|
|
$self->{deflateIn} += length($dataIn); |
| 317 |
|
|
$self->{deflateOut} += length($dataOut); |
| 318 |
|
|
if ( $self->{deflateIn} >= $CompMaxWrite ) { |
| 319 |
|
|
if ( $self->{deflateOut} < $CompMaxRead ) { |
| 320 |
|
|
# |
| 321 |
|
|
# Compression is too high: to avoid huge memory requirements |
| 322 |
|
|
# on read we need to flush(). |
| 323 |
|
|
# |
| 324 |
|
|
$dataOut = $self->{deflate}->flush(); |
| 325 |
|
|
#print("F"); |
| 326 |
|
|
$self->{deflate} = $self->myDeflateInit; |
| 327 |
|
|
return -1 if ( $self->writeBuffered($dataOut) < 0 ); |
| 328 |
|
|
} |
| 329 |
|
|
$self->{deflateIn} = $self->{deflateOut} = 0; |
| 330 |
|
|
} |
| 331 |
|
|
} |
| 332 |
|
|
return $n; |
| 333 |
|
|
} |
| 334 |
|
|
|
| 335 |
|
|
sub name |
| 336 |
|
|
{ |
| 337 |
|
|
my($self) = @_; |
| 338 |
|
|
|
| 339 |
|
|
return $self->{name}; |
| 340 |
|
|
} |
| 341 |
|
|
|
| 342 |
|
|
sub writeTeeStderr |
| 343 |
|
|
{ |
| 344 |
|
|
my($self, $param) = @_; |
| 345 |
|
|
|
| 346 |
|
|
$self->{writeTeeStderr} = $param if ( defined($param) ); |
| 347 |
|
|
return $self->{writeTeeStderr}; |
| 348 |
|
|
} |
| 349 |
|
|
|
| 350 |
|
|
sub close |
| 351 |
|
|
{ |
| 352 |
|
|
my($self) = @_; |
| 353 |
|
|
my $err = 0; |
| 354 |
|
|
|
| 355 |
|
|
if ( $self->{write} && $self->{compress} ) { |
| 356 |
|
|
my $data = $self->{deflate}->flush(); |
| 357 |
|
|
$err = 1 if ( $self->writeBuffered($data) < 0 ); |
| 358 |
|
|
} elsif ( $self->{write} && !$self->{compress} ) { |
| 359 |
|
|
if ( $self->{writeZeroCnt} > 0 ) { |
| 360 |
|
|
# |
| 361 |
|
|
# We got a file of all zero bytes. Write a single zero byte |
| 362 |
|
|
# at the end of the file. On most file systems this is an |
| 363 |
|
|
# efficient way to store the file. |
| 364 |
|
|
# |
| 365 |
|
|
$err = 1 if ( sysseek($self->{fh}, $self->{writeZeroCnt} - 1, 0) |
| 366 |
|
|
!= $self->{writeZeroCnt} - 1 |
| 367 |
|
|
|| syswrite($self->{fh}, "\0") != 1 ); |
| 368 |
|
|
} |
| 369 |
|
|
} |
| 370 |
|
|
$self->writeBuffered(undef, 1); |
| 371 |
|
|
close($self->{fh}); |
| 372 |
|
|
return $err ? -1 : 0; |
| 373 |
|
|
} |
| 374 |
|
|
|
| 375 |
|
|
# |
| 376 |
|
|
# If $compress is >0, copy and compress $srcFile putting the output |
| 377 |
|
|
# in $destFileZ. Otherwise, copy the file to $destFileNoZ, or do |
| 378 |
|
|
# nothing if $destFileNoZ is undef. Finally, if rename is set, then |
| 379 |
|
|
# the source file is removed. |
| 380 |
|
|
# |
| 381 |
|
|
sub compressCopy |
| 382 |
|
|
{ |
| 383 |
|
|
my($class, $srcFile, $destFileZ, $destFileNoZ, $compress, $rmSrc) = @_; |
| 384 |
|
|
my(@s) = stat($srcFile); |
| 385 |
|
|
my $atime = $s[8] =~ /(.*)/ && $1; |
| 386 |
|
|
my $mtime = $s[9] =~ /(.*)/ && $1; |
| 387 |
|
|
if ( $CompZlibOK && $compress > 0 ) { |
| 388 |
|
|
my $fh = BackupPC::FileZIO->open($destFileZ, 1, $compress); |
| 389 |
|
|
my $data; |
| 390 |
|
|
if ( defined($fh) && open(LOG, "<", $srcFile) ) { |
| 391 |
|
|
binmode(LOG); |
| 392 |
|
|
while ( sysread(LOG, $data, 65536) > 0 ) { |
| 393 |
|
|
$fh->write(\$data); |
| 394 |
|
|
} |
| 395 |
|
|
close(LOG); |
| 396 |
|
|
$fh->close(); |
| 397 |
|
|
unlink($srcFile) if ( $rmSrc ); |
| 398 |
|
|
utime($atime, $mtime, $destFileZ); |
| 399 |
|
|
return 1; |
| 400 |
|
|
} else { |
| 401 |
|
|
$fh->close() if ( defined($fh) ); |
| 402 |
|
|
return 0; |
| 403 |
|
|
} |
| 404 |
|
|
} |
| 405 |
|
|
return 0 if ( !defined($destFileNoZ) ); |
| 406 |
|
|
if ( $rmSrc ) { |
| 407 |
|
|
return rename($srcFile, $destFileNoZ); |
| 408 |
|
|
} else { |
| 409 |
|
|
return 0 if ( !copy($srcFile, $destFileNoZ) ); |
| 410 |
|
|
utime($atime, $mtime, $destFileNoZ); |
| 411 |
|
|
} |
| 412 |
|
|
} |
| 413 |
|
|
|
| 414 |
|
|
1; |
Parent Directory
| 
Revision Log