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package Spreadsheet::WriteExcel::BIFFwriter; |
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############################################################################### |
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# |
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# BIFFwriter - An abstract base class for Excel workbooks and worksheets. |
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# |
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# |
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# Used in conjunction with Spreadsheet::WriteExcel |
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# |
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# Copyright 2000-2010, John McNamara, jmcnamara@cpan.org |
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# |
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# Documentation after __END__ |
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# |
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use Exporter; |
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use strict; |
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use vars qw($VERSION @ISA); |
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52717
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@ISA = qw(Exporter); |
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$VERSION = '2.40'; |
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############################################################################### |
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# |
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# Class data. |
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# |
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my $byte_order = ''; |
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my $BIFF_version = 0x0600; |
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############################################################################### |
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# |
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# new() |
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# |
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# Constructor |
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sub new { |
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my $class = $_[0]; |
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my $self = { |
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_byte_order => '', |
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_data => '', |
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_datasize => 0, |
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_limit => 8224, |
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_ignore_continue => 0, |
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}; |
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204
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bless $self, $class; |
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$self->_set_byte_order(); |
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return $self; |
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} |
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############################################################################### |
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# |
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# _set_byte_order() |
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# |
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# Determine the byte order and store it as class data to avoid |
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# recalculating it for each call to new(). |
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# |
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sub _set_byte_order { |
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my $self = shift; |
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if ($byte_order eq ''){ |
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# Check if "pack" gives the required IEEE 64bit float |
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my $teststr = pack "d", 1.2345; |
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126
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my @hexdata =(0x8D, 0x97, 0x6E, 0x12, 0x83, 0xC0, 0xF3, 0x3F); |
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my $number = pack "C8", @hexdata; |
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if ($number eq $teststr) { |
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0
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$byte_order = 0; # Little Endian |
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} |
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elsif ($number eq reverse($teststr)){ |
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$byte_order = 1; # Big Endian |
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} |
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else { |
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# Give up. I'll fix this in a later version. |
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0
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croak ( "Required floating point format not supported " . |
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"on this platform. See the portability section " . |
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"of the documentation." |
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); |
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} |
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} |
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$self->{_byte_order} = $byte_order; |
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} |
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############################################################################### |
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# |
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# _prepend($data) |
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# |
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# General storage function |
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# |
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sub _prepend { |
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104
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2528
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2528
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my $self = shift; |
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2528
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4125
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my $data = join('', @_); |
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2528
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$data = $self->_add_continue($data) if length($data) > $self->{_limit}; |
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2528
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$self->{_data} = $data . $self->{_data}; |
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$self->{_datasize} += length($data); |
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2528
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6540
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return $data; |
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} |
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116
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############################################################################### |
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# |
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# _append($data) |
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# |
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# General storage function |
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# |
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sub _append { |
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124
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1257
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1257
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my $self = shift; |
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1257
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2210
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my $data = join('', @_); |
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1257
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3339
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$data = $self->_add_continue($data) if length($data) > $self->{_limit}; |
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1257
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3121
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$self->{_data} = $self->{_data} . $data; |
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$self->{_datasize} += length($data); |
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132
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1257
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return $data; |
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} |
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136
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############################################################################### |
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# |
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# _store_bof($type) |
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# |
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# $type = 0x0005, Workbook |
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# $type = 0x0010, Worksheet |
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# $type = 0x0020, Chart |
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# |
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# Writes Excel BOF record to indicate the beginning of a stream or |
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# sub-stream in the BIFF file. |
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# |
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sub _store_bof { |
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149
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my $self = shift; |
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196
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299
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my $record = 0x0809; # Record identifier |
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196
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my $length = 0x0010; # Number of bytes to follow |
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153
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196
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312
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my $version = $BIFF_version; |
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196
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293
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my $type = $_[0]; |
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156
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# According to the SDK $build and $year should be set to zero. |
157
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# However, this throws a warning in Excel 5. So, use these |
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# magic numbers. |
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196
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my $build = 0x0DBB; |
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my $year = 0x07CC; |
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162
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196
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my $bfh = 0x00000041; |
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196
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259
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my $sfo = 0x00000006; |
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165
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196
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588
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my $header = pack("vv", $record, $length); |
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196
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569
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my $data = pack("vvvvVV", $version, $type, $build, $year, $bfh, $sfo); |
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168
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196
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749
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$self->_prepend($header, $data); |
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} |
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171
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172
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############################################################################### |
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# |
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# _store_eof() |
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# |
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# Writes Excel EOF record to indicate the end of a BIFF stream. |
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# |
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sub _store_eof { |
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180
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196
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my $self = shift; |
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254
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my $record = 0x000A; # Record identifier |
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my $length = 0x0000; # Number of bytes to follow |
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184
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196
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405
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my $header = pack("vv", $record, $length); |
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186
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196
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652
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$self->_append($header); |
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} |
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189
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190
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############################################################################### |
191
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# |
192
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# _add_continue() |
193
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# |
194
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# Excel limits the size of BIFF records. In Excel 5 the limit is 2084 bytes. In |
195
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# Excel 97 the limit is 8228 bytes. Records that are longer than these limits |
196
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# must be split up into CONTINUE blocks. |
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# |
198
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# This function take a long BIFF record and inserts CONTINUE records as |
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# necessary. |
200
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# |
201
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# Some records have their own specialised Continue blocks so there is also an |
202
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# option to bypass this function. |
203
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# |
204
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sub _add_continue { |
205
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206
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0
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0
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0
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my $self = shift; |
207
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0
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0
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my $data = $_[0]; |
208
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0
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0
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my $limit = $self->{_limit}; |
209
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0
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0
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my $record = 0x003C; # Record identifier |
210
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0
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0
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my $header; |
211
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my $tmp; |
212
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213
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# Skip this if another method handles the continue blocks. |
214
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0
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0
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0
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return $data if $self->{_ignore_continue}; |
215
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216
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# The first 2080/8224 bytes remain intact. However, we have to change |
217
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# the length field of the record. |
218
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# |
219
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0
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0
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$tmp = substr($data, 0, $limit, ""); |
220
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0
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0
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substr($tmp, 2, 2, pack("v", $limit-4)); |
221
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222
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# Strip out chunks of 2080/8224 bytes +4 for the header. |
223
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0
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0
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while (length($data) > $limit) { |
224
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0
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0
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$header = pack("vv", $record, $limit); |
225
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0
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0
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$tmp .= $header; |
226
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0
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0
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$tmp .= substr($data, 0, $limit, ""); |
227
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} |
228
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229
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# Mop up the last of the data |
230
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0
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$header = pack("vv", $record, length($data)); |
231
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$tmp .= $header; |
232
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$tmp .= $data; |
233
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234
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0
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0
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return $tmp ; |
235
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} |
236
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237
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238
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############################################################################### |
239
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# |
240
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# _add_mso_generic() |
241
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# |
242
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# Create a mso structure that is part of an Escher drawing object. These are |
243
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# are used for images, comments and filters. This generic method is used by |
244
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# other methods to create specific mso records. |
245
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# |
246
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# Returns the packed record. |
247
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# |
248
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|
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sub _add_mso_generic { |
249
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|
250
|
196
|
|
|
196
|
|
6966
|
my $self = shift; |
251
|
196
|
|
|
|
|
241
|
my $type = $_[0]; |
252
|
196
|
|
|
|
|
226
|
my $version = $_[1]; |
253
|
196
|
|
|
|
|
208
|
my $instance = $_[2]; |
254
|
196
|
|
|
|
|
245
|
my $data = $_[3]; |
255
|
196
|
100
|
|
|
|
369
|
my $length = defined $_[4] ? $_[4] : length($data); |
256
|
|
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|
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|
|
257
|
|
|
|
|
|
|
# The header contains version and instance info packed into 2 bytes. |
258
|
196
|
|
|
|
|
326
|
my $header = $version | ($instance << 4); |
259
|
|
|
|
|
|
|
|
260
|
196
|
|
|
|
|
456
|
my $record = pack "vvV", $header, $type, $length; |
261
|
196
|
|
|
|
|
319
|
$record .= $data; |
262
|
|
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|
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|
|
|
263
|
196
|
|
|
|
|
843
|
return $record; |
264
|
|
|
|
|
|
|
} |
265
|
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|
|
266
|
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|
267
|
|
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|
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|
|
############################################################################### |
268
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|
|
|
|
|
# |
269
|
|
|
|
|
|
|
# For debugging |
270
|
|
|
|
|
|
|
# |
271
|
|
|
|
|
|
|
sub _hexout { |
272
|
|
|
|
|
|
|
|
273
|
0
|
|
|
0
|
|
|
my $self = shift; |
274
|
|
|
|
|
|
|
|
275
|
0
|
|
|
|
|
|
print +(caller(1))[3], "\n"; |
276
|
|
|
|
|
|
|
|
277
|
0
|
|
|
|
|
|
my $data = join '', @_; |
278
|
|
|
|
|
|
|
|
279
|
0
|
|
|
|
|
|
my @bytes = unpack("H*", $data) =~ /../g; |
280
|
|
|
|
|
|
|
|
281
|
0
|
|
|
|
|
|
while (@bytes > 16) { |
282
|
0
|
|
|
|
|
|
print join " ", splice @bytes, 0, 16; |
283
|
0
|
|
|
|
|
|
print "\n"; |
284
|
|
|
|
|
|
|
} |
285
|
0
|
|
|
|
|
|
print join " ", @bytes, "\n\n"; |
286
|
|
|
|
|
|
|
} |
287
|
|
|
|
|
|
|
|
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
1; |
291
|
|
|
|
|
|
|
|
292
|
|
|
|
|
|
|
|
293
|
|
|
|
|
|
|
__END__ |