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Re^3: Unpack an 8 bit unsigned char matrix (fixed)

by BrowserUk (Pope)
on Jul 15, 2013 at 22:06 UTC ( #1044462=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Unpack an 8 bit unsigned char matrix
in thread Unpack an 8 bit unsigned char matrix

A quick (not binary, but same difference) demo:

#! perl -slw use strict; use Data::Dump qw[ pp ]; sysread( DATA, my $buffer, 80 ) or die $!; my @matrixX10 = map[ unpack 'C*', $_ ], unpack '(a10)*', $buffer; pp\@matrixX10; my @matrixX5 = map[ unpack 'C*', $_ ], unpack '(a5)*', $buffer; pp\@matrixX5; __DATA__ 1234567890123456789012345678901234567890123456789012345678901234567890 +1234567890

Produces:

C:\test\primes>..\junk94 [ [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], [49, 50, 51, 52, 53, 54, 55, 56, 57, 48], ] [ [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], [49, 50, 51, 52, 53], [54, 55, 56, 57, 48], ]

Broken code replaced above:

#! perl -slw use strict; use Data::Dump qw[ pp ]; sysread( DATA, my $buffer, 80 ) or die $!; my @matrixX10 = map[ split 'C*', $_ ], unpack '(a10)*', $buffer; pp\@matrixX10; my @matrixX5 = map[ split 'C*', $_ ], unpack '(a5)*', $buffer; pp\@matrixX5; __DATA__ 1234567890123456789012345678901234567890123456789012345678901234567890 +1234567890

Produces:

C:\test>junk94 [ [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], [1, 2, 3, 4, 5, 6, 7, 8, 9, 0], ] [ [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], [1, 2, 3, 4, 5], [6, 7, 8, 9, 0], ]

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