302 lines
13 KiB
Perl
302 lines
13 KiB
Perl
#!/usr/bin/perl -w
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use strict;
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use warnings;
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# WARNING: This must be kept in sync with the UTF8_MAXBYTES value in
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# utfebcdic.h
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$CHARSET_TRANSLATIONS::UTF_EBCDIC_MAXBYTES = 14;
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# Utilities for various character set issues. Currently handles ASCII and
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# EBCDIC only. It is trivial to add support for new EBCDIC code pages (unless
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# they have identical variant character signatures as existing ones, and there
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# aren't other glitches that arise): just add a mapping table to
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# %ebcdic_translations and regen everything that uses this.
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my %ebcdic_translations = (
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# Keys are code page name; values are arrays that map ASCII ordinals to
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# the code page's ordinals
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'EBCDIC 1047' =>
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[ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
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0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
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0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
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0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
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0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBB, 0xB4, 0x9A, 0x8A, 0xB0, 0xCA, 0xAF, 0xBC,
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0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
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0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
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0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xBA, 0xAE, 0x59,
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0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
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0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
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],
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# 'EBCDIC POSIX-BC' =>
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# [
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# 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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# 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
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# 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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# 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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# 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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# 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xBB, 0xBC, 0xBD, 0x6A, 0x6D,
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# 0x4A, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
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# 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xFB, 0x4F, 0xFD, 0xFF, 0x07,
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# 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
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# 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0x5F,
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# 0x41, 0xAA, 0xB0, 0xB1, 0x9F, 0xB2, 0xD0, 0xB5, 0x79, 0xB4, 0x9A, 0x8A, 0xBA, 0xCA, 0xAF, 0xA1,
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# 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
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# 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
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# 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xE0, 0xFE, 0xDD, 0xFC, 0xAD, 0xAE, 0x59,
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# 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
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# 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xC0, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
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# ],
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'EBCDIC 037' =>
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[
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0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
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0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xBA, 0xE0, 0xBB, 0xB0, 0x6D,
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0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x15, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
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0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
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0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBD, 0xB4, 0x9A, 0x8A, 0x5F, 0xCA, 0xAF, 0xBC,
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0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
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0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
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0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xAD, 0xAE, 0x59,
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0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
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0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
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],
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);
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my $ascii_key = 'ASCII/Latin1';
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my %I8_TO_NATIVE_UTF8; # Maps I8 UTF to final UTF-EBCDIC
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# See http://www.unicode.org/reports/tr16/
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sub get_supported_code_pages() {
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# Returns an ordered array of the currently supported code pages,
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# including ASCII as the 0th element, 1047 as the 1th, and the others
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# sorted lexically by code page name.
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# Create an ASCII table.
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unless (exists $ebcdic_translations{$ascii_key}) {
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for my $i (0 .. 255) {
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$ebcdic_translations{$ascii_key}->[$i] = $i;
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}
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}
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return sort {
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$a eq $ascii_key
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? -1
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: $b eq $ascii_key
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? 1
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: $a =~ /1047/
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? -1
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: $b =~ /1047/
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? 1
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: $a cmp $b
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} keys %ebcdic_translations;
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}
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sub get_a2n($) {
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# Returns the mapping array for ASCII to code page for the code page named
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# by the input parameter.
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my $charset = shift;
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if (! exists $ebcdic_translations{$charset}) {
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die "Unknown character set '$charset'";
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}
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return $ebcdic_translations{$charset};
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}
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sub get_I8_2_utf($) {
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# Returns the mapping array for I8 to code page UTF-EBCDIC for the code
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# page named by the input parameter. This is Table 2 of TR16 customized
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# for the code page. See utfebcdic.h for why, contrary to TR16, it has to
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# be code-page-specific.
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my $charset = shift;
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die "I8 not a valid concept for ASCII" if $charset eq $ascii_key;
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die "'$charset' unknown" unless exists $ebcdic_translations{$charset};
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# Generate the table if not already present
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if (! exists $I8_TO_NATIVE_UTF8{$charset}) {
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# The code points not used for invariants. Initialized to everything,
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# then entries are removed as we go along.
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my %unused_cps;
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for my $i (0 .. 255) {
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$unused_cps{$i} = 1;
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}
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# These are the invariants. The output has them mapped to the
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# original EBCDIC code point.
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for my $i (0 .. 0x9F) {
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use charnames ();
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my $ebcdic_value = $ebcdic_translations{$charset}[$i];
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#printf "$charset: using %02x which is %02x ascii, %s\n", $ebcdic_value, $i, charnames::viacode($i);
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$I8_TO_NATIVE_UTF8{$charset}[$i] = $ebcdic_value;
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if (! defined delete $unused_cps{$ebcdic_value}) {
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die "Two code points map to $ebcdic_value; one is $i";
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}
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}
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# Put the unused code points in order
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my @unused_cps = sort { $a <=> $b } keys %unused_cps;
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# Fill in the rest of the map with these ordered code points, as TR16
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# specifies
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for my $i (0xA0 .. 255) {
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$I8_TO_NATIVE_UTF8{$charset}[$i] = shift @unused_cps;
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#printf "$charset: filling in %02x which is %02x ascii, %s\n", $I8_TO_NATIVE_UTF8{$charset}[$i], $i, charnames::viacode($i);
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}
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if (@unused_cps) {
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die "Left-over code points";
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}
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}
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return $I8_TO_NATIVE_UTF8{$charset};
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}
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{ # Closure
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my $charset; # We use these to do some error checking that the #if and
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# #endif are matched.
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my $indent;
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sub get_conditional_compile_line_start($;$) {
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# Returns the '#if' line to put into C code to compile for the code
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# page given by the first parameter. The second parameter, if
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# present, is the indentation level, like '# if ...'
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if (defined $charset || defined $indent) {
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die "Missing call to get_conditional_compile_line_end()"
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}
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$charset = shift;
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my $indent_level = shift // 0;
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die "This is designed to run only on an ASCII platform" unless ord "A" == 65;
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if ($indent_level == 0) {
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$indent = "";
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}
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else {
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$indent = " " x $indent_level;
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}
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die "Unknown character set '$charset'" unless exists $ebcdic_translations{$charset};
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my $return = "";
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{
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no warnings 'qw';
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my $count = -1;
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# We use all the typical variant characters to construct the #if,
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# so that it is unlikely that a different code page will match
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# this #if
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my @variant_chars = qw/A \\\ [ ] { } ^ ~ ! # | $ @ `/;
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push @variant_chars, "\n";
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for my $char (@variant_chars) {
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my $compare;
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my $ascii_ord = ord $char;
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my $first_time = $return eq "";
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$compare = $ebcdic_translations{$charset}[$ascii_ord];
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$return .= " && " unless $first_time;
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$char = '\n' if $char eq "\n";
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die "Non-graphical character ord=" . ord($char)
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if $char !~ /[[:graph:]]/;
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$return .= "'$char' == $compare";
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$return .= " /* $charset */" if $first_time;
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last if $charset eq $ascii_key;
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$count++;
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$return .= " \\\n " if $first_time || $count % 5 == 0;
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}
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}
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return "#${indent}if $return\n";
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}
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sub get_conditional_compile_line_end () {
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# Returns the #endif for the currently open #if
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my $return = "#${indent}endif\t/* $charset */\n";
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undef $charset;
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undef $indent;
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return $return;
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}
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}
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sub _UTF_START_MASK($) {
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# Internal
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my $len = shift;
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return (($len >= 7) ? 0x00 : (0x1F >> ($len - 2)));
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}
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sub _UTF_START_MARK($) {
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# Internal
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my $len = shift;
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return (($len > 7) ? 0xFF : (0xFF & (0xFE << (7- $len))));
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}
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sub cp_2_utfbytes($$) {
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# Returns a string consisting of the UTF-EBCDIC for the code page given by
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# the 2nd parameter, of the Unicode code point given by the first
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# parameter, using the UTF-MOD algorithm published in TR16. (If the "code
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# page" is ASCII, straight UTF-8 is returned.)
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my ($ucp, $charset) = @_;
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if ($charset eq $ascii_key) {
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my $str = chr $ucp;
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utf8::upgrade($str);
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utf8::encode($str);
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return $str;
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}
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elsif (exists $ebcdic_translations{$charset}) {
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if ($ucp < 0xA0) {
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return chr $ebcdic_translations{$charset}[$ucp];
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}
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my $I8_2_utf = get_I8_2_utf($charset);
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my $len = $ucp < 0xA0 ? 1 :
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$ucp < 0x400 ? 2 :
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$ucp < 0x4000 ? 3 :
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$ucp < 0x40000 ? 4 :
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$ucp < 0x400000 ? 5 :
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$ucp < 0x4000000 ? 6 :
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$ucp < 0x40000000? 7 :
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$CHARSET_TRANSLATIONS::UTF_EBCDIC_MAXBYTES;
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my @str;
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for (1 .. $len - 1) {
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unshift @str, chr $I8_2_utf->[($ucp & 0x1f) | 0xA0];
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$ucp >>= 5;
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}
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unshift @str, chr $I8_2_utf->[($ucp & _UTF_START_MASK($len)) | _UTF_START_MARK($len)];
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return join "", @str;
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}
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else {
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die "Unknown character set '$charset'";
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}
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}
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1;
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