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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002-2020 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
/*
* Unicode related:
* Conversion between UTF-* and UCS-*.
* ToUnicode CMap
*
* Normalization?
*
* I made some unused functions here for completeness and FUTURE USE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "system.h"
#include "mem.h"
#include "error.h"
#include "unicode.h"
#define UC_DEBUG 3
#define UC_DEBUG_STR "UC"
#define UC_REPLACEMENT_CHAR 0x0000FFFD
#define UC_SUR_SHIFT 10
#define UC_SUR_MASK 0x03FFU
#define UC_SUR_LOW_START 0xDC00U
#define UC_SUR_HIGH_START 0xD800U
#define UC_SUR_END 0xE000U
int
UC_is_valid (int32_t ucv)
{
if ( ucv < 0 || ucv > 0x10FFFFL ||
(ucv >= 0x0000D800L && ucv <= 0x0000DFFFL))
return 0;
return 1;
}
int
UC_UTF16BE_is_valid_string (const unsigned char *p, const unsigned char *endptr)
{
if (p + 1 >= endptr)
return 0;
while (p < endptr) {
int32_t ucv = UC_UTF16BE_decode_char(&p, endptr);
if (!UC_is_valid(ucv))
return 0;
}
return 1;
}
int
UC_UTF8_is_valid_string (const unsigned char *p, const unsigned char *endptr)
{
if (p >= endptr)
return 0;
while (p < endptr) {
int32_t ucv = UC_UTF8_decode_char(&p, endptr);
if (!UC_is_valid(ucv))
return 0;
}
return 1;
}
int32_t
UC_UTF16BE_decode_char (const unsigned char **pp, const unsigned char *endptr)
{
const unsigned char *p = *pp;
int32_t ucv = -1;
uint16_t first, second;
if (p + 1 >= endptr)
return -1;
first = ((p[0]) << 8|p[1]); p += 2;
if (first >= UC_SUR_HIGH_START && first < UC_SUR_LOW_START) {
if (p + 1 >= endptr)
return -1;
second = (p[0] << 8|p[1]); p += 2;
ucv = second & UC_SUR_MASK;
ucv |= (first & UC_SUR_MASK) << UC_SUR_SHIFT;
ucv += 0x00010000;
} else if (first >= UC_SUR_LOW_START && first < UC_SUR_END) {
return -1;
} else {
ucv = first;
}
*pp = p;
return ucv;
}
size_t
UC_UTF16BE_encode_char (int32_t ucv, unsigned char **pp, unsigned char *endptr)
{
int count = 0;
unsigned char *p = *pp;
if (ucv >= 0 && ucv <= 0xFFFF) {
if (p + 2 > endptr)
return 0;
p[0] = (ucv >> 8) & 0xff;
p[1] = ucv & 0xff;
count = 2;
} else if (ucv >= 0x010000 && ucv <= 0x10FFFF) {
unsigned short high, low;
if (p + 4 > endptr)
return 0;
ucv -= 0x00010000;
high = (ucv >> UC_SUR_SHIFT) + UC_SUR_HIGH_START;
low = (ucv & UC_SUR_MASK) + UC_SUR_LOW_START;
p[0] = (high >> 8) & 0xff;
p[1] = (high & 0xff);
p[2] = (low >> 8) & 0xff;
p[3] = (low & 0xff);
count = 4;
} else {
if (p + 2 > endptr)
return 0;
p[0] = (UC_REPLACEMENT_CHAR >> 8) & 0xff;
p[1] = (UC_REPLACEMENT_CHAR & 0xff);
count = 2;
}
*pp += count;
return count;
}
int32_t
UC_UTF8_decode_char (const unsigned char **pp, const unsigned char *endptr)
{
const unsigned char *p = *pp;
int32_t ucv;
unsigned char c = *p++;
int nbytes;
if (c <= 0x7f) {
ucv = c;
nbytes = 0;
} else if ((c & 0xe0) == 0xc0) { /* 110x xxxx */
ucv = c & 31;
nbytes = 1;
} else if ((c & 0xf0) == 0xe0) { /* 1110 xxxx */
ucv = c & 0x0f;
nbytes = 2;
} else if ((c & 0xf8) == 0xf0) { /* 1111 0xxx */
ucv = c & 0x07;
nbytes = 3;
} else if ((c & 0xfc) == 0xf8) { /* 1111 10xx */
ucv = c & 0x03;
nbytes = 4;
} else if ((c & 0xfe) == 0xfc) { /* 1111 110x */
ucv = c & 0x01;
nbytes = 5;
} else {
return -1;
}
if (p + nbytes > endptr)
return -1;
while (nbytes-- > 0) {
c = *p++;
if ((c & 0xc0) != 0x80)
return -1;
ucv = (ucv << 6) | (c & 0x3f);
}
*pp = p;
return ucv;
}
size_t
UC_UTF8_encode_char (int32_t ucv, unsigned char **pp, unsigned char *endptr)
{
int count = 0;
unsigned char *p = *pp;
ASSERT( pp && *pp && endptr );
if (!UC_is_valid(ucv))
return 0;
if (ucv < 0x7f) {
if (p + 1 > endptr)
return 0;
p[0] = (unsigned char) ucv;
count = 1;
} else if (ucv <= 0x7ff) {
if (p + 2 > endptr)
return 0;
p[0] = (unsigned char) (0xc0 | (ucv >> 6));
p[1] = (unsigned char) (0x80 | (ucv & 0x3f));
count = 2;
} else if (ucv <= 0xffff) {
if (p + 3 > endptr)
return 0;
p[0] = (unsigned char) (0xe0 | (ucv >> 12));
p[1] = (unsigned char) (0x80 | ((ucv >> 6) & 0x3f));
p[2] = (unsigned char) (0x80 | (ucv & 0x3f));
count = 3;
} else if (ucv <= 0x1fffff) {
if (p + 4 > endptr)
return 0;
p[0] = (unsigned char) (0xf0 | (ucv >> 18));
p[1] = (unsigned char) (0x80 | ((ucv >> 12) & 0x3f));
p[2] = (unsigned char) (0x80 | ((ucv >> 6) & 0x3f));
p[3] = (unsigned char) (0x80 | (ucv & 0x3f));
count = 4;
} else if (ucv <= 0x3ffffff) {
if (p + 5 > endptr)
return 0;
p[0] = (unsigned char) (0xf8 | (ucv >> 24));
p[1] = (unsigned char) (0x80 | ((ucv >> 18) & 0x3f));
p[2] = (unsigned char) (0x80 | ((ucv >> 12) & 0x3f));
p[3] = (unsigned char) (0x80 | ((ucv >> 6) & 0x3f));
p[4] = (unsigned char) (0x80 | (ucv & 0x3f));
count = 5;
} else if (ucv <= 0x7fffffff) {
if (p + 6 > endptr)
return 0;
p[0] = (unsigned char) (0xfc | (ucv >> 30));
p[1] = (unsigned char) (0x80 | ((ucv >> 24) & 0x3f));
p[2] = (unsigned char) (0x80 | ((ucv >> 18) & 0x3f));
p[3] = (unsigned char) (0x80 | ((ucv >> 12) & 0x3f));
p[4] = (unsigned char) (0x80 | ((ucv >> 6) & 0x3f));
p[5] = (unsigned char) (0x80 | (ucv & 0x3f));
count = 6;
}
*pp += count;
return count;
}
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