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/*
* Copyright (c) 2007-2009, Paul Mattes.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the names of Paul Mattes nor the names of his contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY PAUL MATTES "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL PAUL MATTES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* utf8.c
* 3270 Terminal Emulator
* UTF-8 conversions
*/
#include "globals.h"
#include "popupsc.h"
#include "utf8c.h"
char *locale_codeset = CN;
Boolean is_utf8 = False;
/*
* Save the codeset from the locale, and set globals based on known values.
*/
void
set_codeset(char *codeset_name)
{
#if !defined(TCL3270) /*[*/
is_utf8 = (!strcasecmp(codeset_name, "utf-8") ||
!strcasecmp(codeset_name, "utf8") ||
!strcasecmp(codeset_name, "utf_8"));
#else /*][*/
/*
* tcl3270 is always in UTF-8 mode, because it needs to
* supply UTF-8 strings to libtcl and vice-versa.
*/
is_utf8 = True;
#endif /*]*/
Replace(locale_codeset, NewString(codeset_name));
}
/*
* Convert from UCS-4 to UTF-8.
* Returns:
* >0: length of converted character
* -1: invalid UCS-4
*/
int
unicode_to_utf8(ucs4_t ucs4, char *utf8)
{
if (ucs4 & 0x80000000)
return -1;
if (ucs4 <= 0x0000007f) {
utf8[0] = ucs4 & 0x7f; /* 7 bits */
return 1;
} else if (ucs4 <= 0x000007ff) {
utf8[0] = 0xc0 | ((ucs4 >> 6) & 0x1f); /* upper 5 bits */
utf8[1] = 0x80 | (ucs4 & 0x3f); /* lower 6 bits */
return 2;
} else if (ucs4 <= 0x0000ffff) {
utf8[0] = 0xe0 | ((ucs4 >> 12) & 0x0f); /* upper 4 bits */
utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f); /* next 6 bits */
utf8[2] = 0x80 | (ucs4 & 0x3f); /* last 6 bits */
return 3;
} else if (ucs4 <= 0x001fffff) {
utf8[0] = 0xf0 | ((ucs4 >> 18) & 0x07); /* upper 3 bits */
utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f); /* next 6 bits */
utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f); /* next 6 bits */
utf8[3] = 0x80 | (ucs4 & 0x3f); /* last 6 bits */
return 4;
} else if (ucs4 <= 0x03ffffff) {
utf8[0] = 0xf8 | ((ucs4 >> 24) & 0x03); /* upper 2 bits */
utf8[1] = 0x80 | ((ucs4 >> 18) & 0x3f); /* next 6 bits */
utf8[2] = 0x80 | ((ucs4 >> 12) & 0x3f); /* next 6 bits */
utf8[3] = 0x80 | ((ucs4 >> 6) & 0x3f); /* next 6 bits */
utf8[4] = 0x80 | (ucs4 & 0x3f); /* last 6 bits */
return 5;
} else {
utf8[0] = 0xfc | ((ucs4 >> 30) & 0x01); /* upper 1 bit */
utf8[1] = 0x80 | ((ucs4 >> 24) & 0x3f); /* next 6 bits */
utf8[2] = 0x80 | ((ucs4 >> 18) & 0x3f); /* next 6 bits */
utf8[3] = 0x80 | ((ucs4 >> 12) & 0x3f); /* next 6 bits */
utf8[4] = 0x80 | ((ucs4 >> 6) & 0x3f); /* next 6 bits */
utf8[5] = 0x80 | (ucs4 & 0x3f); /* last 6 bits */
return 6;
}
}
/*
* Convert at most 'len' bytes from a UTF-8 string to one UCS-4 character.
* Returns:
* >0: Number of characters consumed.
* 0: Incomplete sequence.
* -1: Invalid sequence.
* -2: Illegal (too-long) encoding.
* -3: Invalid lead byte.
*
* An invalid sequence can be either improperly composed, or using the wrong
* encoding length (often used to get past spam filters and such).
*/
int
utf8_to_unicode(const char *utf8, int len, ucs4_t *ucs4)
{
/* No input is by definition incomplete. */
if (!len)
return 0;
/* See if it's ASCII-7. */
if ((utf8[0] & 0xff) < 0x80) {
*ucs4 = utf8[0] & 0x7f;
return 1;
}
/* Now check for specific UTF-8 leading bytes. */
if ((utf8[0] & 0xe0) == 0xc0) {
/* 110xxxxx 10xxxxxx
* 0x00000080-0x000007ff */
if (len < 2)
return 0;
if ((utf8[1] & 0xc0) != 0x80)
return -1;
*ucs4 = ((utf8[0] << 6) & 0x7c0) |
(utf8[1] & 0x03f);
if (*ucs4 < 0x00000080)
return -1;
return 2;
}
if ((utf8[0] & 0xf0) == 0xe0) {
/* 1110xxxx 10xxxxxx 10xxxxxx
* 0x00000800-0x0000ffff */
if (len < 3)
return 0;
if (((utf8[1] & 0xc0) != 0x80) ||
((utf8[2] & 0xc0) != 0x80))
return -1;
*ucs4 = ((utf8[0] << 12) & 0xf000) |
((utf8[1] << 6) & 0x0fc0) |
((utf8[2]) & 0x003f);
if (*ucs4 < 0x00000800)
return -2;
return 3;
}
if ((utf8[0] & 0xf8) == 0xf0) {
/* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
* 0x00010000-0x001fffff */
if (len < 4)
return 0;
if (((utf8[1] & 0xc0) != 0x80) ||
((utf8[2] & 0xc0) != 0x80) ||
((utf8[3] & 0xc0) != 0x80))
return -1;
*ucs4 = ((utf8[0] << 18) & 0x1c0000) |
((utf8[1] << 12) & 0x03f000) |
((utf8[2] << 6) & 0x000fc0) |
((utf8[3]) & 0x00003f);
if (*ucs4 < 0x00010000)
return -2;
return 4;
}
if ((utf8[0] & 0xfc) == 0xf8) {
/* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
* 0x00200000-0x03ffffff */
if (len < 5)
return 0;
if (((utf8[1] & 0xc0) != 0x80) ||
((utf8[2] & 0xc0) != 0x80) ||
((utf8[3] & 0xc0) != 0x80) ||
((utf8[4] & 0xc0) != 0x80))
return -1;
*ucs4 = ((utf8[0] << 24) & 0x3000000) |
((utf8[1] << 18) & 0x0fc0000) |
((utf8[2] << 12) & 0x003f000) |
((utf8[3] << 6) & 0x0000fc0) |
((utf8[4]) & 0x000003f);
if (*ucs4 < 0x00200000)
return -2;
return 5;
}
if ((utf8[0] & 0xfe) == 0xfc) {
/* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
* 0x04000000-0x7fffffff */
if (len < 6)
return 0;
if (((utf8[1] & 0xc0) != 0x80) ||
((utf8[2] & 0xc0) != 0x80) ||
((utf8[3] & 0xc0) != 0x80) ||
((utf8[4] & 0xc0) != 0x80) ||
((utf8[5] & 0xc0) != 0x80))
return -1;
*ucs4 = ((utf8[0] << 30) & 0x40000000) |
((utf8[1] << 24) & 0x3f000000) |
((utf8[2] << 18) & 0x00fc0000) |
((utf8[3] << 12) & 0x0003f000) |
((utf8[4] << 6) & 0x00000fc0) |
((utf8[5]) & 0x0000003f);
if (*ucs4 < 0x04000000)
return -2;
return 6;
}
return -3;
}
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