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mariadb/mysys/charset.c

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/* Copyright (C) 2000 MySQL AB
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 */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <m_ctype.h>
#include <m_string.h>
#include <my_dir.h>
#include <my_xml.h>
/*
The code below implements this functionality:
- Initializing charset related structures
- Loading dynamic charsets
- Searching for a proper CHARSET_INFO
using charset name, collation name or collation ID
- Setting server default character set
*/
my_bool my_charset_same(CHARSET_INFO *cs1, CHARSET_INFO *cs2)
{
return ((cs1 == cs2) || !strcmp(cs1->csname,cs2->csname));
}
static void set_max_sort_char(CHARSET_INFO *cs)
{
uchar max_char;
uint i;
if (!cs->sort_order)
return;
max_char=cs->sort_order[(uchar) cs->max_sort_char];
for (i= 0; i < 256; i++)
{
if ((uchar) cs->sort_order[i] > max_char)
{
max_char=(uchar) cs->sort_order[i];
cs->max_sort_char= (char) i;
}
}
}
static void init_state_maps(CHARSET_INFO *cs)
{
uint i;
uchar *state_map= cs->state_map;
uchar *ident_map= cs->ident_map;
/* Fill state_map with states to get a faster parser */
for (i=0; i < 256 ; i++)
{
if (my_isalpha(cs,i))
state_map[i]=(uchar) MY_LEX_IDENT;
else if (my_isdigit(cs,i))
state_map[i]=(uchar) MY_LEX_NUMBER_IDENT;
#if defined(USE_MB) && defined(USE_MB_IDENT)
else if (use_mb(cs) && (my_mbcharlen(cs, i)>1))
state_map[i]=(uchar) MY_LEX_IDENT;
#endif
else if (!my_isgraph(cs,i))
state_map[i]=(uchar) MY_LEX_SKIP;
else
state_map[i]=(uchar) MY_LEX_CHAR;
}
state_map[(uchar)'_']=state_map[(uchar)'$']=(uchar) MY_LEX_IDENT;
state_map[(uchar)'\'']=(uchar) MY_LEX_STRING;
state_map[(uchar)'.']=(uchar) MY_LEX_REAL_OR_POINT;
state_map[(uchar)'>']=state_map[(uchar)'=']=state_map[(uchar)'!']= (uchar) MY_LEX_CMP_OP;
state_map[(uchar)'<']= (uchar) MY_LEX_LONG_CMP_OP;
state_map[(uchar)'&']=state_map[(uchar)'|']=(uchar) MY_LEX_BOOL;
state_map[(uchar)'#']=(uchar) MY_LEX_COMMENT;
state_map[(uchar)';']=(uchar) MY_LEX_COLON;
state_map[(uchar)':']=(uchar) MY_LEX_SET_VAR;
state_map[0]=(uchar) MY_LEX_EOL;
state_map[(uchar)'\\']= (uchar) MY_LEX_ESCAPE;
state_map[(uchar)'/']= (uchar) MY_LEX_LONG_COMMENT;
state_map[(uchar)'*']= (uchar) MY_LEX_END_LONG_COMMENT;
state_map[(uchar)'@']= (uchar) MY_LEX_USER_END;
state_map[(uchar) '`']= (uchar) MY_LEX_USER_VARIABLE_DELIMITER;
state_map[(uchar)'"']= (uchar) MY_LEX_STRING_OR_DELIMITER;
/*
Create a second map to make it faster to find identifiers
*/
for (i=0; i < 256 ; i++)
{
ident_map[i]= (uchar) (state_map[i] == MY_LEX_IDENT ||
state_map[i] == MY_LEX_NUMBER_IDENT);
}
/* Special handling of hex and binary strings */
state_map[(uchar)'x']= state_map[(uchar)'X']= (uchar) MY_LEX_IDENT_OR_HEX;
state_map[(uchar)'b']= state_map[(uchar)'b']= (uchar) MY_LEX_IDENT_OR_BIN;
state_map[(uchar)'n']= state_map[(uchar)'N']= (uchar) MY_LEX_IDENT_OR_NCHAR;
}
static void simple_cs_init_functions(CHARSET_INFO *cs)
{
if (cs->state & MY_CS_BINSORT)
{
cs->coll= &my_collation_bin_handler;
}
else
{
cs->coll= &my_collation_8bit_simple_ci_handler;
}
cs->cset= &my_charset_8bit_handler;
cs->mbmaxlen = 1;
}
typedef struct
{
int nchars;
MY_UNI_IDX uidx;
} uni_idx;
#define PLANE_SIZE 0x100
#define PLANE_NUM 0x100
#define PLANE_NUMBER(x) (((x)>>8) % PLANE_NUM)
static int pcmp(const void * f, const void * s)
{
const uni_idx *F= (const uni_idx*) f;
const uni_idx *S= (const uni_idx*) s;
int res;
if (!(res=((S->nchars)-(F->nchars))))
res=((F->uidx.from)-(S->uidx.to));
return res;
}
static my_bool create_fromuni(CHARSET_INFO *cs)
{
uni_idx idx[PLANE_NUM];
int i,n;
/* Clear plane statistics */
bzero(idx,sizeof(idx));
/* Count number of characters in each plane */
for (i=0; i< 0x100; i++)
{
uint16 wc=cs->tab_to_uni[i];
int pl= PLANE_NUMBER(wc);
if (wc || !i)
{
if (!idx[pl].nchars)
{
idx[pl].uidx.from=wc;
idx[pl].uidx.to=wc;
}else
{
idx[pl].uidx.from=wc<idx[pl].uidx.from?wc:idx[pl].uidx.from;
idx[pl].uidx.to=wc>idx[pl].uidx.to?wc:idx[pl].uidx.to;
}
idx[pl].nchars++;
}
}
/* Sort planes in descending order */
qsort(&idx,PLANE_NUM,sizeof(uni_idx),&pcmp);
for (i=0; i < PLANE_NUM; i++)
{
int ch,numchars;
/* Skip empty plane */
if (!idx[i].nchars)
break;
numchars=idx[i].uidx.to-idx[i].uidx.from+1;
idx[i].uidx.tab=(unsigned char*)my_once_alloc(numchars *
sizeof(*idx[i].uidx.tab),
MYF(MY_WME));
bzero(idx[i].uidx.tab,numchars*sizeof(*idx[i].uidx.tab));
for (ch=1; ch < PLANE_SIZE; ch++)
{
uint16 wc=cs->tab_to_uni[ch];
if (wc >= idx[i].uidx.from && wc <= idx[i].uidx.to && wc)
{
int ofs= wc - idx[i].uidx.from;
idx[i].uidx.tab[ofs]= ch;
}
}
}
/* Allocate and fill reverse table for each plane */
n=i;
cs->tab_from_uni= (MY_UNI_IDX*) my_once_alloc(sizeof(MY_UNI_IDX)*(n+1),
MYF(MY_WME));
for (i=0; i< n; i++)
cs->tab_from_uni[i]= idx[i].uidx;
/* Set end-of-list marker */
bzero(&cs->tab_from_uni[i],sizeof(MY_UNI_IDX));
return FALSE;
}
static void simple_cs_copy_data(CHARSET_INFO *to, CHARSET_INFO *from)
{
to->number= from->number ? from->number : to->number;
to->state|= from->state;
if (from->csname)
to->csname= my_once_strdup(from->csname,MYF(MY_WME));
if (from->name)
to->name= my_once_strdup(from->name,MYF(MY_WME));
if (from->comment)
to->comment= my_once_strdup(from->comment,MYF(MY_WME));
if (from->ctype)
{
to->ctype= (uchar*) my_once_memdup((char*) from->ctype,
MY_CS_CTYPE_TABLE_SIZE, MYF(MY_WME));
init_state_maps(to);
}
if (from->to_lower)
to->to_lower= (uchar*) my_once_memdup((char*) from->to_lower,
MY_CS_TO_LOWER_TABLE_SIZE, MYF(MY_WME));
if (from->to_upper)
to->to_upper= (uchar*) my_once_memdup((char*) from->to_upper,
MY_CS_TO_UPPER_TABLE_SIZE, MYF(MY_WME));
if (from->sort_order)
{
to->sort_order= (uchar*) my_once_memdup((char*) from->sort_order,
MY_CS_SORT_ORDER_TABLE_SIZE,
MYF(MY_WME));
set_max_sort_char(to);
}
if (from->tab_to_uni)
{
uint sz= MY_CS_TO_UNI_TABLE_SIZE*sizeof(uint16);
to->tab_to_uni= (uint16*) my_once_memdup((char*)from->tab_to_uni, sz,
MYF(MY_WME));
create_fromuni(to);
}
to->mbmaxlen= 1;
}
static my_bool simple_cs_is_full(CHARSET_INFO *cs)
{
return ((cs->csname && cs->tab_to_uni && cs->ctype && cs->to_upper &&
cs->to_lower) &&
(cs->number && cs->name &&
(cs->sort_order || (cs->state & MY_CS_BINSORT) )));
}
static int add_collation(CHARSET_INFO *cs)
{
if (cs->name && (cs->number || (cs->number=get_charset_number(cs->name))))
{
if (!all_charsets[cs->number])
{
if (cs->state & MY_CS_COMPILED)
goto clear;
if (!(all_charsets[cs->number]=
(CHARSET_INFO*) my_once_alloc(sizeof(CHARSET_INFO),MYF(0))))
return MY_XML_ERROR;
bzero((void*)all_charsets[cs->number],sizeof(CHARSET_INFO));
}
if (cs->primary_number == cs->number)
cs->state |= MY_CS_PRIMARY;
if (cs->binary_number == cs->number)
cs->state |= MY_CS_BINSORT;
if (!(all_charsets[cs->number]->state & MY_CS_COMPILED))
{
simple_cs_init_functions(all_charsets[cs->number]);
simple_cs_copy_data(all_charsets[cs->number],cs);
if (simple_cs_is_full(all_charsets[cs->number]))
{
all_charsets[cs->number]->state |= MY_CS_LOADED;
}
}
else
{
CHARSET_INFO *dst= all_charsets[cs->number];
dst->state |= cs->state;
if (cs->comment)
dst->comment= my_once_strdup(cs->comment,MYF(MY_WME));
}
clear:
cs->number= 0;
cs->primary_number= 0;
cs->binary_number= 0;
cs->name= NULL;
cs->state= 0;
cs->sort_order= NULL;
cs->state= 0;
}
return MY_XML_OK;
}
#define MAX_BUF 1024*16
#define MY_CHARSET_INDEX "Index.xml"
const char *charsets_dir= NULL;
static int charset_initialized=0;
static my_bool my_read_charset_file(const char *filename, myf myflags)
{
char *buf;
int fd;
uint len;
if (!(buf= (char *)my_malloc(MAX_BUF,myflags)))
return FALSE;
if ((fd=my_open(filename,O_RDONLY,myflags)) < 0)
{
my_free(buf,myflags);
return TRUE;
}
len=read(fd,buf,MAX_BUF);
my_close(fd,myflags);
if (my_parse_charset_xml(buf,len,add_collation))
{
#ifdef NOT_YET
printf("ERROR at line %d pos %d '%s'\n",
my_xml_error_lineno(&p)+1,
my_xml_error_pos(&p),
my_xml_error_string(&p));
#endif
}
my_free(buf, myflags);
return FALSE;
}
char *get_charsets_dir(char *buf)
{
const char *sharedir= SHAREDIR;
char *res;
DBUG_ENTER("get_charsets_dir");
if (charsets_dir != NULL)
strmake(buf, charsets_dir, FN_REFLEN-1);
else
{
if (test_if_hard_path(sharedir) ||
is_prefix(sharedir, DEFAULT_CHARSET_HOME))
strxmov(buf, sharedir, "/", CHARSET_DIR, NullS);
else
strxmov(buf, DEFAULT_CHARSET_HOME, "/", sharedir, "/", CHARSET_DIR,
NullS);
}
res= convert_dirname(buf,buf,NullS);
DBUG_PRINT("info",("charsets dir: '%s'", buf));
DBUG_RETURN(res);
}
CHARSET_INFO *all_charsets[256];
CHARSET_INFO *default_charset_info = &my_charset_latin1;
#define MY_ADD_CHARSET(x) all_charsets[(x)->number]=(x)
static my_bool init_compiled_charsets(myf flags __attribute__((unused)))
{
CHARSET_INFO *cs;
MY_ADD_CHARSET(&my_charset_bin);
MY_ADD_CHARSET(&my_charset_latin1);
MY_ADD_CHARSET(&my_charset_latin1_bin);
MY_ADD_CHARSET(&my_charset_latin1_german2_ci);
#ifdef HAVE_CHARSET_big5
MY_ADD_CHARSET(&my_charset_big5_chinese_ci);
MY_ADD_CHARSET(&my_charset_big5_bin);
#endif
#ifdef HAVE_CHARSET_cp1250
MY_ADD_CHARSET(&my_charset_cp1250_czech_ci);
#endif
#ifdef HAVE_CHARSET_latin2
MY_ADD_CHARSET(&my_charset_latin2_czech_ci);
#endif
#ifdef HAVE_CHARSET_euckr
MY_ADD_CHARSET(&my_charset_euckr_korean_ci);
MY_ADD_CHARSET(&my_charset_euckr_bin);
#endif
#ifdef HAVE_CHARSET_gb2312
MY_ADD_CHARSET(&my_charset_gb2312_chinese_ci);
MY_ADD_CHARSET(&my_charset_gb2312_bin);
#endif
#ifdef HAVE_CHARSET_gbk
MY_ADD_CHARSET(&my_charset_gbk_chinese_ci);
MY_ADD_CHARSET(&my_charset_gbk_bin);
#endif
#ifdef HAVE_CHARSET_sjis
MY_ADD_CHARSET(&my_charset_sjis_japanese_ci);
MY_ADD_CHARSET(&my_charset_sjis_bin);
#endif
#ifdef HAVE_CHARSET_tis620
MY_ADD_CHARSET(&my_charset_tis620_thai_ci);
MY_ADD_CHARSET(&my_charset_tis620_bin);
#endif
#ifdef HAVE_CHARSET_ucs2
MY_ADD_CHARSET(&my_charset_ucs2_general_ci);
MY_ADD_CHARSET(&my_charset_ucs2_bin);
#endif
#ifdef HAVE_CHARSET_ujis
MY_ADD_CHARSET(&my_charset_ujis_japanese_ci);
MY_ADD_CHARSET(&my_charset_ujis_bin);
#endif
#ifdef HAVE_CHARSET_utf8
MY_ADD_CHARSET(&my_charset_utf8_general_ci);
MY_ADD_CHARSET(&my_charset_utf8_bin);
#endif
/* Copy compiled charsets */
for (cs=compiled_charsets; cs->name; cs++)
{
all_charsets[cs->number]=cs;
}
return FALSE;
}
#ifdef __NETWARE__
my_bool STDCALL init_available_charsets(myf myflags)
#else
static my_bool init_available_charsets(myf myflags)
#endif
{
char fname[FN_REFLEN];
my_bool error=FALSE;
/*
We have to use charset_initialized to not lock on THR_LOCK_charset
inside get_internal_charset...
*/
if (!charset_initialized)
{
CHARSET_INFO **cs;
/*
To make things thread safe we are not allowing other threads to interfere
while we may changing the cs_info_table
*/
pthread_mutex_lock(&THR_LOCK_charset);
bzero(&all_charsets,sizeof(all_charsets));
init_compiled_charsets(myflags);
/* Copy compiled charsets */
for (cs=all_charsets; cs < all_charsets+255 ; cs++)
{
if (*cs)
{
set_max_sort_char(*cs);
init_state_maps(*cs);
}
}
strmov(get_charsets_dir(fname), MY_CHARSET_INDEX);
error= my_read_charset_file(fname,myflags);
charset_initialized=1;
pthread_mutex_unlock(&THR_LOCK_charset);
}
return error;
}
void free_charsets(void)
{
charset_initialized=0;
}
uint get_charset_number(const char *charset_name)
{
CHARSET_INFO **cs;
if (init_available_charsets(MYF(0))) /* If it isn't initialized */
return 0;
for (cs= all_charsets; cs < all_charsets+255; ++cs)
{
if ( cs[0] && cs[0]->name &&
!my_strcasecmp(&my_charset_latin1, cs[0]->name, charset_name))
return cs[0]->number;
}
return 0; /* this mimics find_type() */
}
const char *get_charset_name(uint charset_number)
{
CHARSET_INFO *cs;
if (init_available_charsets(MYF(0))) /* If it isn't initialized */
return "?";
cs=all_charsets[charset_number];
if (cs && (cs->number == charset_number) && cs->name )
return (char*) cs->name;
return (char*) "?"; /* this mimics find_type() */
}
static CHARSET_INFO *get_internal_charset(uint cs_number, myf flags)
{
char buf[FN_REFLEN];
CHARSET_INFO *cs;
/*
To make things thread safe we are not allowing other threads to interfere
while we may changing the cs_info_table
*/
pthread_mutex_lock(&THR_LOCK_charset);
cs= all_charsets[cs_number];
if (cs && !(cs->state & (MY_CS_COMPILED | MY_CS_LOADED)))
{
strxmov(get_charsets_dir(buf), cs->csname, ".xml", NullS);
my_read_charset_file(buf,flags);
cs= (cs->state & MY_CS_LOADED) ? cs : NULL;
}
pthread_mutex_unlock(&THR_LOCK_charset);
return cs;
}
CHARSET_INFO *get_charset(uint cs_number, myf flags)
{
CHARSET_INFO *cs;
(void) init_available_charsets(MYF(0)); /* If it isn't initialized */
if (!cs_number)
return NULL;
cs=get_internal_charset(cs_number, flags);
if (!cs && (flags & MY_WME))
{
char index_file[FN_REFLEN], cs_string[23];
strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
cs_string[0]='#';
int10_to_str(cs_number, cs_string+1, 10);
my_error(EE_UNKNOWN_CHARSET, MYF(ME_BELL), cs_string, index_file);
}
return cs;
}
CHARSET_INFO *get_charset_by_name(const char *cs_name, myf flags)
{
uint cs_number;
CHARSET_INFO *cs;
(void) init_available_charsets(MYF(0)); /* If it isn't initialized */
cs_number=get_charset_number(cs_name);
cs= cs_number ? get_internal_charset(cs_number,flags) : NULL;
if (!cs && (flags & MY_WME))
{
char index_file[FN_REFLEN];
strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
my_error(EE_UNKNOWN_CHARSET, MYF(ME_BELL), cs_name, index_file);
}
return cs;
}
CHARSET_INFO *get_charset_by_csname(const char *cs_name,
uint cs_flags,
myf flags)
{
CHARSET_INFO *cs=NULL;
CHARSET_INFO **css;
DBUG_ENTER("get_charset_by_csname");
DBUG_PRINT("enter",("name: '%s'", cs_name));
(void) init_available_charsets(MYF(0)); /* If it isn't initialized */
for (css= all_charsets; css < all_charsets+255; ++css)
{
if ( css[0] && (css[0]->state & cs_flags) &&
css[0]->csname && !my_strcasecmp(&my_charset_latin1,
css[0]->csname, cs_name))
{
cs= css[0]->number ? get_internal_charset(css[0]->number,flags) : NULL;
break;
}
}
if (!cs && (flags & MY_WME))
{
char index_file[FN_REFLEN];
strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
my_error(EE_UNKNOWN_CHARSET, MYF(ME_BELL), cs_name, index_file);
}
DBUG_RETURN(cs);
}
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