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1 # Copyright (c) 2000 Ned Konz. All rights reserved. This program is free |
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2 # software; you can redistribute it and/or modify it under the same terms |
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3 # as Perl itself. |
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4 |
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5 # File handle that uses a string internally and can seek |
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6 # This is given as a demo for getting a zip file written |
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7 # to a string. |
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8 # I probably should just use IO::Scalar instead. |
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9 # Ned Konz, March 2000 |
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10 # |
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11 # $Revision: 1.3 $ |
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12 |
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13 use strict; |
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14 package Archive::Zip::BufferedFileHandle; |
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15 use FileHandle (); |
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16 use Carp; |
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17 |
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18 sub new |
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19 { |
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20 my $class = shift || __PACKAGE__; |
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21 $class = ref($class) || $class; |
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22 my $self = bless( { |
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23 content => '', |
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24 position => 0, |
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25 size => 0 |
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26 }, $class ); |
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27 return $self; |
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28 } |
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29 |
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30 # Utility method to read entire file |
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31 sub readFromFile |
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32 { |
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33 my $self = shift; |
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34 my $fileName = shift; |
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35 my $fh = FileHandle->new($fileName, "r"); |
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36 if (! $fh) |
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37 { |
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38 Carp::carp("Can't open $fileName: $!\n"); |
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39 return undef; |
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40 } |
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41 local $/ = undef; |
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42 $self->{content} = <$fh>; |
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43 $self->{size} = length($self->{content}); |
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44 return $self; |
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45 } |
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46 |
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47 sub contents |
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48 { |
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49 my $self = shift; |
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50 if (@_) |
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51 { |
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52 $self->{content} = shift; |
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53 $self->{size} = length($self->{content}); |
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54 } |
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55 return $self->{content}; |
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56 } |
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57 |
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58 sub binmode |
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59 { 1 } |
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60 |
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61 sub close |
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62 { 1 } |
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63 |
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64 sub eof |
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65 { |
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66 my $self = shift; |
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67 return $self->{position} >= $self->{size}; |
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68 } |
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69 |
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70 sub seek |
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71 { |
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72 my $self = shift; |
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73 my $pos = shift; |
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74 my $whence = shift; |
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75 |
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76 # SEEK_SET |
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77 if ($whence == 0) { $self->{position} = $pos; } |
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78 # SEEK_CUR |
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79 elsif ($whence == 1) { $self->{position} += $pos; } |
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80 # SEEK_END |
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81 elsif ($whence == 2) { $self->{position} = $self->{size} + $pos; } |
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82 else { return 0; } |
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83 |
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84 return 1; |
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85 } |
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86 |
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87 sub tell |
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88 { return shift->{position}; } |
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89 |
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90 # Copy my data to given buffer |
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91 sub read |
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92 { |
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93 my $self = shift; |
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94 my $buf = \($_[0]); shift; |
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95 my $len = shift; |
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96 my $offset = shift || 0; |
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97 |
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98 $$buf = '' if not defined($$buf); |
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99 my $bytesRead = ($self->{position} + $len > $self->{size}) |
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100 ? ($self->{size} - $self->{position}) |
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101 : $len; |
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102 substr($$buf, $offset, $bytesRead) |
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103 = substr($self->{content}, $self->{position}, $bytesRead); |
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104 $self->{position} += $bytesRead; |
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105 return $bytesRead; |
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106 } |
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107 |
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108 # Copy given buffer to me |
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109 sub write |
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110 { |
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111 my $self = shift; |
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112 my $buf = \($_[0]); shift; |
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113 my $len = shift; |
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114 my $offset = shift || 0; |
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115 |
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116 $$buf = '' if not defined($$buf); |
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117 my $bufLen = length($$buf); |
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118 my $bytesWritten = ($offset + $len > $bufLen) |
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119 ? $bufLen - $offset |
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120 : $len; |
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121 substr($self->{content}, $self->{position}, $bytesWritten) |
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122 = substr($$buf, $offset, $bytesWritten); |
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123 $self->{size} = length($self->{content}); |
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124 return $bytesWritten; |
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125 } |
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126 |
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127 sub clearerr() { 1 } |
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128 |
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129 # vim: ts=4 sw=4 |
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130 1; |
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131 __END__ |
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132 |
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133 =head1 COPYRIGHT |
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134 |
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135 Copyright (c) 2000 Ned Konz. All rights reserved. This program is free |
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136 software; you can redistribute it and/or modify it under the same terms |
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137 as Perl itself. |
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138 |
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139 =cut |