/* $Id: charmap.c,v 1.29.2.4 2005/01/16 23:13:31 adam Exp $
Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
Index Data Aps
This file is part of the Zebra server.
Zebra 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, or (at your option) any later
version.
Zebra 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 Zebra; see the file LICENSE.zebra. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
/*
* Support module to handle character-conversions into and out of the
* Zebra dictionary.
*/
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
typedef unsigned ucs4_t;
#include <zebrautl.h>
#include <charmap.h>
#define CHR_MAXSTR 1024
#define CHR_MAXEQUIV 32
const unsigned char CHR_FIELD_BEGIN = '^';
const char *CHR_UNKNOWN = "\001";
const char *CHR_SPACE = "\002";
const char *CHR_BASE = "\003";
const char *CHR_CUT = "\376"; /* high number to keep BASE stable */
struct chrmaptab_info
{
chr_t_entry *input; /* mapping table for input data */
chr_t_entry *q_input; /* mapping table for queries */
unsigned char *output[256]; /* return mapping - for display of registers */
int base_uppercase; /* Start of upper-case ordinals */
NMEM nmem;
};
/*
* Character map trie node.
*/
struct chr_t_entry
{
chr_t_entry **children; /* array of children */
unsigned char **target; /* target for this node, if any */
};
/*
* General argument structure for callback functions (internal use only)
*/
typedef struct chrwork
{
chrmaptab map;
char string[CHR_MAXSTR+1];
} chrwork;
/*
* Add an entry to the character map.
*/
static chr_t_entry *set_map_string(chr_t_entry *root, NMEM nmem,
const char *from, int len, char *to,
const char *from_0)
{
if (!from_0)
from_0 = from;
if (!root)
{
root = (chr_t_entry *) nmem_malloc(nmem, sizeof(*root));
root->children = 0;
root->target = 0;
}
if (!len)
{
if (!root->target || !root->target[0] || strcmp(root->target[0], to))
{
if (from_0 &&
root->target && root->target[0] && root->target[0][0] &&
strcmp (root->target[0], CHR_UNKNOWN))
{
yaz_log (LOG_WARN, "duplicate entry for charmap from '%s'",
from_0);
}
root->target = (unsigned char **)
nmem_malloc(nmem, sizeof(*root->target)*2);
root->target[0] = (unsigned char *) nmem_strdup(nmem, to);
root->target[1] = 0;
}
}
else
{
if (!root->children)
{
int i;
root->children = (chr_t_entry **)
nmem_malloc(nmem, sizeof(chr_t_entry*) * 256);
for (i = 0; i < 256; i++)
root->children[i] = 0;
}
if (!(root->children[(unsigned char) *from] =
set_map_string(root->children[(unsigned char) *from], nmem,
from + 1, len - 1, to, from_0)))
return 0;
}
return root;
}
static chr_t_entry *find_entry(chr_t_entry *t, const char **from, int len)
{
chr_t_entry *res;
if (len && t->children && t->children[(unsigned char) **from])
{
const char *pos = *from;
(*from)++;
if ((res = find_entry(t->children[(unsigned char) *pos],
from, len - 1)))
return res;
/* no match */
*from = pos;
}
/* no children match. use ourselves, if we have a target */
return t->target ? t : 0;
}
static chr_t_entry *find_entry_x(chr_t_entry *t, const char **from, int *len, int first)
{
chr_t_entry *res;
while (*len <= 0)
{ /* switch to next buffer */
if (*len < 0)
break;
from++;
len++;
}
if (*len > 0 && t->children)
{
const char *old_from = *from;
int old_len = *len;
res = 0;
if (first && t->children[CHR_FIELD_BEGIN])
{
if ((res = find_entry_x(t->children[CHR_FIELD_BEGIN], from, len, 0)) && res != t->children[CHR_FIELD_BEGIN])
return res;
else
res = 0;
/* otherwhise there was no match on beginning of field, move on */
}
if (!res && t->children[(unsigned char) **from])
{
(*len)--;
(*from)++;
if ((res = find_entry_x(t->children[(unsigned char) *old_from],
from, len, 0)))
return res;
/* no match */
*len = old_len;
*from = old_from;
}
}
/* no children match. use ourselves, if we have a target */
return t->target ? t : 0;
}
const char **chr_map_input_x(chrmaptab maptab, const char **from, int *len, int first)
{
chr_t_entry *t = maptab->input;
chr_t_entry *res;
if (!(res = find_entry_x(t, from, len, first)))
abort();
return (const char **) (res->target);
}
const char **chr_map_input(chrmaptab maptab, const char **from, int len, int first)
{
chr_t_entry *t = maptab->input;
chr_t_entry *res;
int len_tmp[2];
len_tmp[0] = len;
len_tmp[1] = -1;
if (!(res = find_entry_x(t, from, len_tmp, first)))
abort();
return (const char **) (res->target);
}
const char *chr_map_output(chrmaptab maptab, const char **from, int len)
{
unsigned char c = ** (unsigned char **) from;
(*from)++;
return (const char*) maptab->output[c];
}
unsigned char zebra_prim(char **s)
{
unsigned char c;
unsigned int i = 0;
yaz_log (LOG_DEBUG, "prim %.3s", *s);
if (**s == '\\')
{
(*s)++;
c = **s;
switch (c)
{
case '\\': c = '\\'; (*s)++; break;
case 'r': c = '\r'; (*s)++; break;
case 'n': c = '\n'; (*s)++; break;
case 't': c = '\t'; (*s)++; break;
case 's': c = ' '; (*s)++; break;
case 'x': sscanf(*s, "x%2x", &i); c = i; *s += 3; break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
sscanf(*s, "%3o", &i);
c = i;
*s += 3;
break;
default:
(*s)++;
}
}
else
{
c = **s;
++(*s);
}
return c;
}
static int zebra_ucs4_strlen(ucs4_t *s)
{
int i = 0;
while (*s++)
i++;
return i;
}
ucs4_t zebra_prim_w(ucs4_t **s)
{
ucs4_t c;
ucs4_t i = 0;
char fmtstr[8];
yaz_log (LOG_DEBUG, "prim_w %.3s", (char *) *s);
if (**s == '\\')
{
(*s)++;
c = **s;
switch (c)
{
case '\\': c = '\\'; (*s)++; break;
case 'r': c = '\r'; (*s)++; break;
case 'n': c = '\n'; (*s)++; break;
case 't': c = '\t'; (*s)++; break;
case 's': c = ' '; (*s)++; break;
case 'x':
if (zebra_ucs4_strlen(*s) >= 3)
{
fmtstr[0] = (*s)[1];
fmtstr[1] = (*s)[2];
fmtstr[2] = 0;
sscanf(fmtstr, "%x", &i);
c = i;
*s += 3;
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (zebra_ucs4_strlen(*s) >= 3)
{
fmtstr[0] = (*s)[0];
fmtstr[1] = (*s)[1];
fmtstr[2] = (*s)[2];
fmtstr[3] = 0;
sscanf(fmtstr, "%o", &i);
c = i;
*s += 3;
}
break;
case 'L':
if (zebra_ucs4_strlen(*s) >= 5)
{
fmtstr[0] = (*s)[1];
fmtstr[1] = (*s)[2];
fmtstr[2] = (*s)[3];
fmtstr[3] = (*s)[4];
fmtstr[4] = 0;
sscanf(fmtstr, "%x", &i);
c = i;
*s += 5;
}
break;
default:
(*s)++;
}
}
else
{
c = **s;
++(*s);
}
yaz_log (LOG_DEBUG, "out %d", c);
return c;
}
/*
* Callback function.
* Add an entry to the value space.
*/
static void fun_addentry(const char *s, void *data, int num)
{
chrmaptab tab = (chrmaptab) data;
char tmp[2];
tmp[0] = num; tmp[1] = '\0';
tab->input = set_map_string(tab->input, tab->nmem, s, strlen(s), tmp, 0);
tab->output[num + tab->base_uppercase] =
(unsigned char *) nmem_strdup(tab->nmem, s);
}
/*
* Callback function.
* Add a space-entry to the value space.
*/
static void fun_addspace(const char *s, void *data, int num)
{
chrmaptab tab = (chrmaptab) data;
tab->input = set_map_string(tab->input, tab->nmem, s, strlen(s),
(char*) CHR_SPACE, 0);
}
/*
* Callback function.
* Add a space-entry to the value space.
*/
static void fun_addcut(const char *s, void *data, int num)
{
chrmaptab tab = (chrmaptab) data;
tab->input = set_map_string(tab->input, tab->nmem, s, strlen(s),
(char*) CHR_CUT, 0);
}
/*
* Create a string containing the mapped characters provided.
*/
static void fun_mkstring(const char *s, void *data, int num)
{
chrwork *arg = (chrwork *) data;
const char **res, *p = s;
res = chr_map_input(arg->map, &s, strlen(s), 0);
if (*res == (char*) CHR_UNKNOWN)
logf(LOG_WARN, "Map: '%s' has no mapping", p);
strncat(arg->string, *res, CHR_MAXSTR - strlen(arg->string));
arg->string[CHR_MAXSTR] = '\0';
}
/*
* Add a map to the string contained in the argument.
*/
static void fun_add_map(const char *s, void *data, int num)
{
chrwork *arg = (chrwork *) data;
assert(arg->map->input);
logf (LOG_DEBUG, "set map %.*s", (int) strlen(s), s);
set_map_string(arg->map->input, arg->map->nmem, s, strlen(s), arg->string,
0);
for (s = arg->string; *s; s++)
logf (LOG_DEBUG, " %3d", (unsigned char) *s);
}
/*
* Add a query map to the string contained in the argument.
*/
static void fun_add_qmap(const char *s, void *data, int num)
{
chrwork *arg = (chrwork *) data;
assert(arg->map->q_input);
logf (LOG_DEBUG, "set qmap %.*s", (int) strlen(s), s);
set_map_string(arg->map->q_input, arg->map->nmem, s,
strlen(s), arg->string, 0);
for (s = arg->string; *s; s++)
logf (LOG_DEBUG, " %3d", (unsigned char) *s);
}
static int scan_to_utf8 (yaz_iconv_t t, ucs4_t *from, size_t inlen,
char *outbuf, size_t outbytesleft)
{
size_t inbytesleft = inlen * sizeof(ucs4_t);
char *inbuf = (char*) from;
size_t ret;
if (t == 0)
*outbuf++ = *from; /* ISO-8859-1 is OK here */
else
{
ret = yaz_iconv (t, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
if (ret == (size_t) (-1))
{
yaz_log(LOG_LOG, "from: %2X %2X %2X %2X",
from[0], from[1], from[2], from[3]);
yaz_log (LOG_WARN|LOG_ERRNO, "bad unicode sequence");
return -1;
}
}
*outbuf = '\0';
return 0;
}
static int scan_string(char *s_native,
yaz_iconv_t t_unicode, yaz_iconv_t t_utf8,
void (*fun)(const char *c, void *data, int num),
void *data, int *num)
{
char str[1024];
ucs4_t arg[512];
ucs4_t arg_prim[512];
ucs4_t *s0, *s = arg;
ucs4_t c, begin, end;
size_t i;
if (t_unicode != 0)
{
char *outbuf = (char *) arg;
char *inbuf = s_native;
size_t outbytesleft = sizeof(arg)-4;
size_t inbytesleft = strlen(s_native);
size_t ret;
ret = yaz_iconv(t_unicode, &inbuf, &inbytesleft,
&outbuf, &outbytesleft);
if (ret == (size_t)(-1))
return -1;
i = (outbuf - (char*) arg)/sizeof(ucs4_t);
}
else
{
for (i = 0; s_native[i]; i++)
arg[i] = s_native[i] & 255; /* ISO-8859-1 conversion */
}
arg[i] = 0; /* terminate */
if (s[0] == 0xfeff || s[0] == 0xfeff) /* skip byte Order Mark */
s++;
while (*s)
{
switch (*s)
{
case '{':
s++;
begin = zebra_prim_w(&s);
if (*s != '-')
{
logf(LOG_FATAL, "Bad range in char-map");
return -1;
}
s++;
end = zebra_prim_w(&s);
if (end <= begin)
{
logf(LOG_FATAL, "Bad range in char-map");
return -1;
}
s++;
for (c = begin; c <= end; c++)
{
if (scan_to_utf8 (t_utf8, &c, 1, str, sizeof(str)-1))
return -1;
(*fun)(str, data, num ? (*num)++ : 0);
}
break;
case '[': s++; abort(); break;
case '(':
++s;
s0 = s; i = 0;
while (*s != ')' || s[-1] == '\\')
arg_prim[i++] = zebra_prim_w(&s);
arg_prim[i] = 0;
if (scan_to_utf8 (t_utf8, arg_prim, zebra_ucs4_strlen(arg_prim), str, sizeof(str)-1))
return -1;
(*fun)(str, data, num ? (*num)++ : 0);
s++;
break;
default:
c = zebra_prim_w(&s);
if (scan_to_utf8 (t_utf8, &c, 1, str, sizeof(str)-1))
return -1;
(*fun)(str, data, num ? (*num)++ : 0);
}
}
return 0;
}
chrmaptab chrmaptab_create(const char *tabpath, const char *name, int map_only,
const char *tabroot)
{
FILE *f;
char line[512], *argv[50];
chrmaptab res;
int lineno = 0;
int errors = 0;
int argc, num = (int) *CHR_BASE, i;
NMEM nmem;
yaz_iconv_t t_unicode = 0;
yaz_iconv_t t_utf8 = 0;
unsigned endian = 31;
const char *ucs4_native = "UCS-4";
if (*(char*) &endian == 31) /* little endian? */
ucs4_native = "UCS-4LE";
t_utf8 = yaz_iconv_open ("UTF-8", ucs4_native);
logf (LOG_DEBUG, "maptab %s open", name);
if (!(f = yaz_fopen(tabpath, name, "r", tabroot)))
{
logf(LOG_WARN|LOG_ERRNO, "%s", name);
return 0;
}
nmem = nmem_create ();
res = (chrmaptab) nmem_malloc(nmem, sizeof(*res));
res->nmem = nmem;
res->input = (chr_t_entry *) nmem_malloc(res->nmem, sizeof(*res->input));
res->input->target = (unsigned char **)
nmem_malloc(res->nmem, sizeof(*res->input->target) * 2);
res->input->target[0] = (unsigned char*) CHR_UNKNOWN;
res->input->target[1] = 0;
res->input->children = (chr_t_entry **)
nmem_malloc(res->nmem, sizeof(res->input) * 256);
for (i = 0; i < 256; i++)
{
res->input->children[i] = (chr_t_entry *)
nmem_malloc(res->nmem, sizeof(*res->input));
res->input->children[i]->children = 0;
res->input->children[i]->target = (unsigned char **)
nmem_malloc (res->nmem, 2 * sizeof(unsigned char *));
res->input->children[i]->target[1] = 0;
if (map_only)
{
res->input->children[i]->target[0] = (unsigned char *)
nmem_malloc (res->nmem, 2 * sizeof(unsigned char));
res->input->children[i]->target[0][0] = i;
res->input->children[i]->target[0][1] = 0;
}
else
res->input->children[i]->target[0] = (unsigned char*) CHR_UNKNOWN;
}
res->q_input = (chr_t_entry *)
nmem_malloc(res->nmem, sizeof(*res->q_input));
res->q_input->target = 0;
res->q_input->children = 0;
for (i = *CHR_BASE; i < 256; i++)
res->output[i] = 0;
res->output[(int) *CHR_SPACE] = (unsigned char *) " ";
res->output[(int) *CHR_UNKNOWN] = (unsigned char*) "@";
res->base_uppercase = 0;
while (!errors && (argc = readconf_line(f, &lineno, line, 512, argv, 50)))
if (!map_only && !yaz_matchstr(argv[0], "lowercase"))
{
if (argc != 2)
{
logf(LOG_FATAL, "Syntax error in charmap");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8, fun_addentry,
res, &num) < 0)
{
logf(LOG_FATAL, "Bad value-set specification");
++errors;
}
res->base_uppercase = num;
res->output[(int) *CHR_SPACE + num] = (unsigned char *) " ";
res->output[(int) *CHR_UNKNOWN + num] = (unsigned char*) "@";
num = (int) *CHR_BASE;
}
else if (!map_only && !yaz_matchstr(argv[0], "uppercase"))
{
if (!res->base_uppercase)
{
logf(LOG_FATAL, "Uppercase directive with no lowercase set");
++errors;
}
if (argc != 2)
{
logf(LOG_FATAL, "Missing arg for uppercase directive");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8, fun_addentry,
res, &num) < 0)
{
logf(LOG_FATAL, "Bad value-set specification");
++errors;
}
}
else if (!map_only && !yaz_matchstr(argv[0], "space"))
{
if (argc != 2)
{
logf(LOG_FATAL, "Syntax error in charmap for space");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8,
fun_addspace, res, 0) < 0)
{
logf(LOG_FATAL, "Bad space specification");
++errors;
}
}
else if (!map_only && !yaz_matchstr(argv[0], "cut"))
{
if (argc != 2)
{
logf(LOG_FATAL, "Syntax error in charmap for cut");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8,
fun_addcut, res, 0) < 0)
{
logf(LOG_FATAL, "Bad cut specification");
++errors;
}
}
else if (!yaz_matchstr(argv[0], "map"))
{
chrwork buf;
if (argc != 3)
{
logf(LOG_FATAL, "charmap directive map requires 2 args");
++errors;
}
buf.map = res;
buf.string[0] = '\0';
if (scan_string(argv[2], t_unicode, t_utf8,
fun_mkstring, &buf, 0) < 0)
{
logf(LOG_FATAL, "Bad map target");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8,
fun_add_map, &buf, 0) < 0)
{
logf(LOG_FATAL, "Bad map source");
++errors;
}
}
else if (!yaz_matchstr(argv[0], "qmap"))
{
chrwork buf;
if (argc != 3)
{
logf(LOG_FATAL, "charmap directive qmap requires 2 args");
++errors;
}
buf.map = res;
buf.string[0] = '\0';
if (scan_string(argv[2], t_unicode, t_utf8,
fun_mkstring, &buf, 0) < 0)
{
logf(LOG_FATAL, "Bad qmap target");
++errors;
}
if (scan_string(argv[1], t_unicode, t_utf8,
fun_add_qmap, &buf, 0) < 0)
{
logf(LOG_FATAL, "Bad qmap source");
++errors;
}
}
else if (!yaz_matchstr(argv[0], "encoding"))
{
/*
* Fix me. When t_unicode==0 and use encoding directive in *.chr file the beheviour of the
* zebra need to comment next part of code.
*/
/* Original code */
#if 1
if (t_unicode != 0)
yaz_iconv_close (t_unicode);
t_unicode = yaz_iconv_open (ucs4_native, argv[1]);
#endif
/*
* Fix me. It is additional staff for conversion of characters from local encoding
* of *.chr file to UTF-8 (internal encoding).
* NOTE: The derective encoding must be first directive in *.chr file.
*/
/* For whatever reason Oleg enabled this.. */
#if 0
if (t_utf8 != 0)
yaz_iconv_close(t_utf8);
t_utf8 = yaz_iconv_open ("UTF-8", argv[1]);
#endif
}
else
{
logf(LOG_WARN, "Syntax error at '%s' in %s", line, name);
}
yaz_fclose(f);
if (errors)
{
chrmaptab_destroy(res);
res = 0;
}
logf (LOG_DEBUG, "maptab %s close %d errors", name, errors);
if (t_utf8 != 0)
yaz_iconv_close(t_utf8);
if (t_unicode != 0)
yaz_iconv_close(t_unicode);
return res;
}
void chrmaptab_destroy(chrmaptab tab)
{
if (tab)
nmem_destroy (tab->nmem);
}
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