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1 #!/usr/bin/env perl |
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2 # |
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3 # Author: Makarius |
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4 # |
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5 # raw_dump - direct copy without extra buffering |
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6 # |
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7 |
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8 use warnings; |
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9 use strict; |
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10 |
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11 use IO::File; |
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12 |
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13 |
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14 # args |
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15 |
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16 my ($input, $output) = @ARGV; |
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17 |
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18 |
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19 # prepare files |
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20 |
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21 my $infile; |
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22 my $outfile; |
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23 |
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24 if ($input eq "-") { $infile = *STDIN; } |
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25 else { |
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26 $infile = new IO::File $input, "r"; |
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27 defined $infile || die $!; |
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28 } |
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29 |
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30 if ($output eq "-") { $outfile = *STDOUT; } |
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31 else { |
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32 $outfile = new IO::File $output, "w"; |
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33 defined $outfile || die $!; |
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34 } |
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35 |
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36 binmode $infile; |
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37 binmode $outfile; |
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38 |
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39 |
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40 # main loop |
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41 |
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42 my $chunk; |
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43 while ((sysread $infile, $chunk, 65536), length $chunk > 0) { |
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44 my $end = length $chunk; |
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45 my $offset = 0; |
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46 while ($offset < $end) { |
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47 $offset += syswrite $outfile, $chunk, $end - $offset, $offset; |
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48 } |
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49 } |
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50 |
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51 |
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52 # cleanup |
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53 |
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54 undef $infile; |
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55 undef $outfile; |
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56 |
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