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Full Discussion: [Perl] Does m/\x0A/ same as m/\x{0A}/ ?
Top Forums Shell Programming and Scripting [Perl] Does m/\x0A/ same as m/\x{0A}/ ? Post 302645123 by natong on Wednesday 23rd of May 2012 06:25:19 AM
Old 05-23-2012
[Perl] Does m/\x0A/ same as m/\x{0A}/ ?
Perl allow hex character with just one digit.
Such as \x0 \x9 \xA.

How to force to use 2 digits in m// and s///.
Such as \x00 \x09 \x0A.

---------- Post updated at 05:20 PM ---------- Previous update was at 03:38 PM ----------

I don't know why these code replace as text, not a real hex binary code.
Code:
$s1 = "83 C4 0C 85 C0 75 ??";
$r1 = "83 C4 0C 85 C0 90 90";

$s1 = convert($s1);
$r1 = convert($r1);

sub convert
{
    $i =  shift(@_);
    $i =~ s#(\w\w)#\\x\{\1\}#g;
    $i =~ s#(\?\?)#\.#g;
    $i =~ s#\s##g;
    return $i;
}

open(IN,$file);
binmode(IN);
read(IN,$bin,$filesize);
close(IN);

$bin =~ s/$s1/$r1/;
print $bin;

---------- Post updated at 05:25 PM ---------- Previous update was at 05:20 PM ----------

If i use these it work.

Code:
$s1 = "\x83\xC4\x0C\x85\xC0\x75."; 
$r1 = "\x83\xC4\x0C\x85\xC0\x90\x90";  

open(IN,$file); 
binmode(IN); 
read(IN,$bin,$filesize); 
close(IN);  

$bin =~ s/$s1/$r1/; 
print $bin;

Last edited by natong; 05-23-2012 at 07:26 AM.. Reason: Code tags.
 

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LEARN ABOUT OSF1

charmap

charmap(4)						     Kernel Interfaces Manual							charmap(4)

NAME

       charmap - Defines character symbols as character encodings

DESCRIPTION

       The  character  set  description  (charmap) file defines character symbols as character encodings. This file is the source file for a coded
       character set, or codeset.  All supported codesets have the Portable Character Set (PCS) as a proper subset.  The PCS consists of the  fol-
       lowing character symbols (listed by their standardized symbolic names) and hexadecimal encodings:

       -------------------------------------------
       Symbol Name	     Hexadecimal Encoding
       -------------------------------------------
       <NUL>		     x00
       <SOH>		     x01
       <STX>		     x02
       <ETX>		     x03
       <EOT>		     x04
       <ENQ>		     x05
       <ACK>		     x06
       <alert>		     x07
       <backspace>	     x08
       <tab>		     x09
       <newline>	     x0A
       <vertical-tab>	     x0B
       <form-feed>	     x0C
       <carriage-return>     x0D
       <SO>		     x0E
       <SI>		     x0F
       <DLE>		     x10
       <DC1>		     x11
       <DC2>		     x12
       <DC3>		     x13
       <DC4>		     x14
       <NAK>		     x15
       <SYN>		     x16
       <ETB>		     x17
       <CAN>		     x18
       <EM>		     x19
       <SUB>		     x1A
       <ESC>		     x1B
       <IS4>		     x1C
       <IS3>		     x1D
       <IS2>		     x1E
       <IS1>		     x1F
       <space>		     x20
       <exclamation-mark>    x21
       <quotation-mark>      x22
       <number-sign>	     x23
       <dollar-sign>	     x24
       <percent>	     x25
       <ampersand>	     x26
       <apostrophe>	     x27
       <left-parenthesis>    x28
       <right-parenthesis>   x29
       <asterisk>	     x2A
       <plus-sign>	     x2B
       <comma>		     x2C
       <hyphen> 	     x2D
       <period> 	     x2E
       <slash>		     x2F
       <zero>		     x30
       <one>		     x31

       <two>		     x32
       <three>		     x33
       <four>		     x34
       <five>		     x35
       <six>		     x36
       <seven>		     x37
       <eight>		     x38
       <nine>		     x39
       <colon>		     x3A
       <semi-colon>	     x3B
       <less-than>	     x3C
       <equal-sign>	     x3D
       <greater-than>	     x3E
       <question-mark>	     x3F
       <commercial-at>	     x40
       <A>		     x41
       <B>		     x42
       <C>		     x43
       <D>		     x44
       <E>		     x45
       <F>		     x46
       <G>		     x47
       <H>		     x48
       <I>		     x49
       <J>		     x4A
       <K>		     x4B
       <L>		     x4C
       <M>		     x4D
       <N>		     x4E
       <O>		     x4F
       <P>		     x50
       <Q>		     x51
       <R>		     x52
       <S>		     x53
       <T>		     x54
       <U>		     x55
       <V>		     x56
       <W>		     x57
       <X>		     x58
       <Y>		     x59
       <Z>		     x5A
       <left-bracket>	     x5B
       <backslash>	     x5C
       <right-bracket>	     x5D
       <circumflex>	     x5E
       <underscore>	     x5F
       <grave-accent>	     x60
       <a>		     x61
       <b>		     x62
       <c>		     x63
       <d>		     x64
       <e>		     x65
       <f>		     x66
       <g>		     x67
       <h>		     x68
       <i>		     x69
       <j>		     x6A
       <k>		     x6B
       <l>		     x6C
       <m>		     x6D
       <n>		     x6E
       <o>		     x6F
       <p>		     x70
       <q>		     x71
       <r>		     x72

       <s>		     x73
       <t>		     x74
       <u>		     x75
       <v>		     x76
       <w>		     x77
       <x>		     x78
       <y>		     x79
       <z>		     x7A
       <left-brace>	     x7B
       <vertical-line>	     x7C
       <right-brace>	     x7D
       <tilde>		     x7E
       <DEL>		     x7F
       -------------------------------------------

       The charmap file has the following components: An optional special symbolic name declarations section

	      Each  declaration in this section consists of a special symbolic name, followed by one or more space or tab characters, and a value.
	      The following list describes the special symbolic names that you can include in the declarations section: Specifies the name of  the
	      codeset  for  which  the charmap file is defined.  This value determines the value returned by the nl_langinfo (CODESET) subroutine.
	      If <code_set_name> is not declared, the name for the Portable Character Set is used.  Specifies the maximum number  of  bytes  in  a
	      character  for the codeset.  Valid values are 1 to 4.  The default value is 1.  Specifies the minimum number of bytes in a character
	      for the codeset.	Since all supported codesets have the Portable Character Set as a proper subset, this value must be 1.	 Specifies
	      the  escape  character  that indicates encodings in hexadecimal or octal notation.  The default value is a  (backslash).  Specifies
	      the character used to indicate a comment within a charmap file.  The default value is a # (number sign).	The CHARMAP section header

	      This header marks the beginning of the section that associates character symbols with encodings.	Mapping statements for	characters
	      in the codeset

	      Each statement lists a symbolic name for a character and its associated encoding.  The format of a mapping statement is:

	      <char_symbol> encoding

	      A  symbolic  name begins with the < (left-angle bracket) character and ends with the > (right-angle bracket) character.  The charac-
	      ters for char_symbol (between < and >) can be any characters from the Portable Character Set, except for control and  space  charac-
	      ters. The right-angle bracket (>) can occur in char_symbol as well in the last position of the name.  You must precede all > charac-
	      ters but the last one with the escape character (as specified by the <escape_char> special symbolic name).

	      The format of a mapping statement is:

	      <char_symbol> encoding

	      An encoding is specified as one or more character constants, with the  maximum  number  of  character  constants	specified  by  the
	      <mb_cur_max>  special symbolic name.  The encoding may be listed as decimal, octal, or hexadecimal constants with the following for-
	      mats: xxx, where x is a hexadecimal digit ooo or oo, where o is an octal digit dddd or ddd, where d is a decimal digit

	      Some examples of character symbol definitions are the following:

	      <A>	 d65	     #decimal constant <B>	  x42	      #hexadecimal constant <j10101>   x81xA1     #multiple  hexadecimal
	      constants

	      A  range	of symbolic names and corresponding encoded values may also be defined, where the nonnumeric prefix for each symbolic name
	      is common, and the numeric portion of the second symbolic name  is equal to or greater than the numeric portion of  the  first  sym-
	      bolic  name.   In this format, a symbolic name value consists of zero or more nonnumeric characters followed by an integer of one or
	      more decimal  digits.  This format defines a series of symbolic names.  For example, the string <j0101>...<j0104> is interpreted	as
	      the <j0101>, <j0102>, <j0103>, and <j0104> symbolic names, in that order.

	      In  statements  defining	ranges	of symbolic names, the encoded value listed is the value for the first symbolic name in the range.
	      Subsequent symbolic names have encoded values in increasing order.  For example:

	      <j0101>...<j0104>        d129d254

	      The preceding statement is interpreted as follows:

	      <j0101> d129d254 <j0102> d129d255 <j0103> d130d0 <j0104> d130d1

	      Although you cannot assign multiple encodings to one symbolic name, you can create multiple names for one encoded  value.   This	is
	      allowed  because	some characters have several common names.  For example, the "." character is called a period in some parts of the
	      world, and a full stop in others.  Both names may appear in the charmap.	For example:

	      <period>	      x2e <full-stop>	   x2e

	      If used, comments must begin with the character specified by the <comment_char> special symbolic name.  When an  entire  line  is  a
	      comment, you must specify <comment_char> in the first column of the line.  The END CHARMAP trailer

	      This entry denotes the end of character map statements.

       The following example is a portion of a possible charmap file:

       CHARMAP	<code_set_name> 	 "ISO8859-1"  <mb_cur_max>	      1 <mb_cur_min>		1 <escape_char> 	   <comment_char>
       #

       <NUL>			 x00	<SOH>			  x01	 <STX>			   x02   <ETX> 		     x03    <EOT>
       x04   <ENQ>			x05   <ACK>			 x06  <alert>			x07  <backspace>	       x09  <tab>
       x09 <newline>		    x0a <vertical-tab> 	 x0b <form-feed>	      x0c <carriage-return>	   x0d END CHARMAP

FILES

       Character set description (charmap) source files for supported locales.	The /usr/lib/nls/loc/charmaps directory does not exist when source
       files for installed locales are not provided.

RELATED INFORMATION

       Commands:  locale(1), localedef(1).

       Files:  locale(4).  delim off

																	charmap(4)
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