| #!/usr/bin/env perl |
| # |
| # Extract the ASN.1 module text from the given set of RFC files. |
| # |
| |
| |
| my $inasn = 0; # Are we inside ASN.1 grammar? |
| my $found = 0; |
| my $currentFname = ''; |
| |
| if(-t STDIN && $#ARGV == -1) { |
| print STDERR "Extract ASN.1 specification from the RFC file\n"; |
| print STDERR "Usage: $0 <rfc-file.txt> ...\n"; |
| print STDERR "Usage: <someprog> | $0\n"; |
| exit(1); |
| } |
| |
| while(<>) { |
| # |
| # Strip RFC page delimiters. |
| # |
| next if /^[A-Z].*\[Page [0-9]+\]$/; |
| next if /^$/; |
| next if /^RFC [0-9].*[0-9]+$/; |
| |
| if($inasn == 0) { |
| # |
| # The least correct way to find the start of ASN |
| # definition. That is, to ask a user. |
| # |
| if(/^[ \t]*END[ \t]*(--.*)?$/) { |
| print STDERR |
| "Missed an ASN.1 grammar before line ". $. ."?\n"; |
| exit(1); |
| } |
| |
| my $modName = ''; # ASN.1 module name |
| my $rfcid = ''; |
| $rfcid = $1 . '-' if($ARGV =~ /([a-z0-9]+)/i); |
| |
| if(/^[ \t]*([A-Z][A-Za-z0-9-]*).*DEFINITIONS.*::=/) { |
| $modName = $1; |
| $currentFname = $rfcid . $modName . ".asn1"; |
| $inasn = 1; |
| } elsif(/^[ \t]*([A-Z][A-Za-z0-9-]*).*{[ \t]*iso/ |
| || /^[ \t]*{[ \t]*iso/) { |
| $modName = $1; |
| unless(length($modName)) { |
| next unless $prevLine =~ |
| /^[ \t]*([A-Z][A-Za-z0-9-]*)[ \t]*$/; |
| $modName = $1; |
| } |
| $currentFname = $rfcid . $modName . ".asn1"; |
| my @a = ($_); |
| my $i; |
| for($i = 0; $i < 8; $i++) { |
| $_ = <>; |
| push(@a, $_); |
| if(/DEFINITIONS/) { |
| $_ = join('', @a); |
| $inasn = 1; |
| last; |
| } |
| } |
| next unless $inasn; |
| } elsif(/^\s*DEFINITIONS\s*$/ |
| && $prevLine =~ /^\s*([A-Z][A-Za-z0-9-]*)\s*{[0-9a-z)( -]+}\s*$/) { |
| $_ = $prevLine . $prevComments . $_; |
| $modName = $1; |
| $currentFname = $rfcid . $modName. ".asn1"; |
| $inasn = 1; |
| } else { |
| if(/^[ \t]*--/) { |
| $prevComments .= $_; |
| } else { |
| $prevComments = ''; |
| $prevLine = $_; |
| } |
| next; |
| } |
| |
| print STDERR "Found $modName at line $.\n=> Saving as $currentFname\n"; |
| open(O, "> $currentFname") or die "Can't open $currentFname"; |
| select(O); |
| |
| $found++; |
| print "\n"; |
| print "-- \n"; |
| print "-- ASN.1 module found by $0 in $ARGV at line " . $. . "\n"; |
| print "-- \n"; |
| print "\n"; |
| } |
| |
| if(/^[ \t]*END[ \t]*(--.*)?$/) { |
| print; |
| select(STDOUT); |
| close(O); |
| $inasn = 0; |
| next; |
| } |
| |
| # |
| # The following clauses are primarily designed to make |
| # asn1c command-line easier (i.e., to avoid "-ftypes88"). |
| # You may want to get rid of them if you're doing generic |
| # ASN.1 extraction and do not want to alter the ASN.1 specs. |
| # |
| if( |
| /^([ \t]*)((UniversalString|BMPString|UTF8String)\s+::=\s+\[[A-Z]+\s\d+\]\sIMPLICIT\sOCTET\sSTRING)(.*)$/ms |
| ) { |
| print "\n-- Legacy redefinition of $3 removed by $0:\n"; |
| print "$1-- $2 -- $4"; |
| next; |
| } elsif(/delete following line if \"new\" types are supported/) { |
| print; |
| print "/* Legacy stuff deleted by $0:\n"; |
| $_ = <>; |
| print; |
| print " */\n"; |
| next; |
| } |
| |
| |
| print; # Dump the ASN.1 module line out. |
| } |
| |
| die "No ASN.1 modules found\n" unless $found; |