charset.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:18k
- /* 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 uint
- get_collation_number_internal(const char *name)
- {
- CHARSET_INFO **cs;
- for (cs= all_charsets;
- cs < all_charsets+array_elements(all_charsets)-1 ;
- cs++)
- {
- if ( cs[0] && cs[0]->name &&
- !my_strcasecmp(&my_charset_latin1, cs[0]->name, name))
- return cs[0]->number;
- }
- return 0;
- }
- static my_bool init_state_maps(CHARSET_INFO *cs)
- {
- uint i;
- uchar *state_map;
- uchar *ident_map;
- if (!(cs->state_map= (uchar*) my_once_alloc(256, MYF(MY_WME))))
- return 1;
-
- if (!(cs->ident_map= (uchar*) my_once_alloc(256, MYF(MY_WME))))
- return 1;
- state_map= cs->state_map;
- 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 (my_mbcharlen(cs, i)>1)
- state_map[i]=(uchar) MY_LEX_IDENT;
- #endif
- else if (my_isspace(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_SEMICOLON;
- 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;
- return 0;
- }
- static void simple_cs_init_functions(CHARSET_INFO *cs)
- {
- if (cs->state & MY_CS_BINSORT)
- cs->coll= &my_collation_8bit_bin_handler;
- else
- cs->coll= &my_collation_8bit_simple_ci_handler;
-
- cs->cset= &my_charset_8bit_handler;
- }
- static int cs_copy_data(CHARSET_INFO *to, CHARSET_INFO *from)
- {
- to->number= from->number ? from->number : to->number;
- if (from->csname)
- if (!(to->csname= my_once_strdup(from->csname,MYF(MY_WME))))
- goto err;
-
- if (from->name)
- if (!(to->name= my_once_strdup(from->name,MYF(MY_WME))))
- goto err;
-
- if (from->comment)
- if (!(to->comment= my_once_strdup(from->comment,MYF(MY_WME))))
- goto err;
-
- if (from->ctype)
- {
- if (!(to->ctype= (uchar*) my_once_memdup((char*) from->ctype,
- MY_CS_CTYPE_TABLE_SIZE,
- MYF(MY_WME))))
- goto err;
- if (init_state_maps(to))
- goto err;
- }
- if (from->to_lower)
- if (!(to->to_lower= (uchar*) my_once_memdup((char*) from->to_lower,
- MY_CS_TO_LOWER_TABLE_SIZE,
- MYF(MY_WME))))
- goto err;
- if (from->to_upper)
- if (!(to->to_upper= (uchar*) my_once_memdup((char*) from->to_upper,
- MY_CS_TO_UPPER_TABLE_SIZE,
- MYF(MY_WME))))
- goto err;
- if (from->sort_order)
- {
- if (!(to->sort_order= (uchar*) my_once_memdup((char*) from->sort_order,
- MY_CS_SORT_ORDER_TABLE_SIZE,
- MYF(MY_WME))))
- goto err;
- }
- if (from->tab_to_uni)
- {
- uint sz= MY_CS_TO_UNI_TABLE_SIZE*sizeof(uint16);
- if (!(to->tab_to_uni= (uint16*) my_once_memdup((char*)from->tab_to_uni,
- sz, MYF(MY_WME))))
- goto err;
- }
- if (from->tailoring)
- if (!(to->tailoring= my_once_strdup(from->tailoring,MYF(MY_WME))))
- goto err;
- return 0;
- err:
- return 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_collation_number_internal(cs->name))))
- {
- if (!all_charsets[cs->number])
- {
- 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;
-
- all_charsets[cs->number]->state|= cs->state;
-
- if (!(all_charsets[cs->number]->state & MY_CS_COMPILED))
- {
- CHARSET_INFO *new= all_charsets[cs->number];
- if (cs_copy_data(all_charsets[cs->number],cs))
- return MY_XML_ERROR;
- if (!strcmp(cs->csname,"ucs2") )
- {
- #if defined(HAVE_CHARSET_ucs2) && defined(HAVE_UCA_COLLATIONS)
- new->cset= my_charset_ucs2_general_uca.cset;
- new->coll= my_charset_ucs2_general_uca.coll;
- new->strxfrm_multiply= my_charset_ucs2_general_uca.strxfrm_multiply;
- new->min_sort_char= my_charset_ucs2_general_uca.min_sort_char;
- new->max_sort_char= my_charset_ucs2_general_uca.max_sort_char;
- new->mbminlen= 2;
- new->mbmaxlen= 2;
- new->state |= MY_CS_AVAILABLE | MY_CS_LOADED;
- #endif
- }
- else
- {
- uchar *sort_order= all_charsets[cs->number]->sort_order;
- simple_cs_init_functions(all_charsets[cs->number]);
- new->mbminlen= 1;
- new->mbmaxlen= 1;
- if (simple_cs_is_full(all_charsets[cs->number]))
- {
- all_charsets[cs->number]->state |= MY_CS_LOADED;
- }
- all_charsets[cs->number]->state|= MY_CS_AVAILABLE;
-
- /*
- Check if case sensitive sort order: A < a < B.
- We need MY_CS_FLAG for regex library, and for
- case sensitivity flag for 5.0 client protocol,
- to support isCaseSensitive() method in JDBC driver
- */
- if (sort_order && sort_order['A'] < sort_order['a'] &&
- sort_order['a'] < sort_order['B'])
- all_charsets[cs->number]->state|= MY_CS_CSSORT;
- }
- }
- else
- {
- /*
- We need the below to make get_charset_name()
- and get_charset_number() working even if a
- character set has not been really incompiled.
- The above functions are used for example
- in error message compiler extra/comp_err.c.
- If a character set was compiled, this information
- will get lost and overwritten in add_compiled_collation().
- */
- CHARSET_INFO *dst= all_charsets[cs->number];
- dst->number= cs->number;
- if (cs->comment)
- if (!(dst->comment= my_once_strdup(cs->comment,MYF(MY_WME))))
- return MY_XML_ERROR;
- if (cs->csname)
- if (!(dst->csname= my_once_strdup(cs->csname,MYF(MY_WME))))
- return MY_XML_ERROR;
- if (cs->name)
- if (!(dst->name= my_once_strdup(cs->name,MYF(MY_WME))))
- return MY_XML_ERROR;
- }
- 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 MY_MAX_ALLOWED_BUF 1024*1024
- #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;
- MY_STAT stat_info;
-
- if (!my_stat(filename, &stat_info, MYF(myflags)) ||
- ((len= (uint)stat_info.st_size) > MY_MAX_ALLOWED_BUF) ||
- !(buf= (char *)my_malloc(len,myflags)))
- return TRUE;
-
- if ((fd=my_open(filename,O_RDONLY,myflags)) < 0)
- {
- my_free(buf,myflags);
- return TRUE;
- }
- len=read(fd,buf,len);
- 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;
- void add_compiled_collation(CHARSET_INFO *cs)
- {
- all_charsets[cs->number]= cs;
- cs->state|= MY_CS_AVAILABLE;
- }
- static void *cs_alloc(uint size)
- {
- return my_once_alloc(size, MYF(MY_WME));
- }
- #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);
- if (!charset_initialized)
- {
- bzero(&all_charsets,sizeof(all_charsets));
- init_compiled_charsets(myflags);
-
- /* Copy compiled charsets */
- for (cs=all_charsets;
- cs < all_charsets+array_elements(all_charsets)-1 ;
- cs++)
- {
- if (*cs)
- {
- if (cs[0]->ctype)
- if (init_state_maps(*cs))
- *cs= NULL;
- }
- }
-
- 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_collation_number(const char *name)
- {
- init_available_charsets(MYF(0));
- return get_collation_number_internal(name);
- }
- uint get_charset_number(const char *charset_name, uint cs_flags)
- {
- CHARSET_INFO **cs;
- init_available_charsets(MYF(0));
-
- for (cs= all_charsets;
- cs < all_charsets+array_elements(all_charsets)-1 ;
- cs++)
- {
- if ( cs[0] && cs[0]->csname && (cs[0]->state & cs_flags) &&
- !my_strcasecmp(&my_charset_latin1, cs[0]->csname, charset_name))
- return cs[0]->number;
- }
- return 0;
- }
- const char *get_charset_name(uint charset_number)
- {
- CHARSET_INFO *cs;
- init_available_charsets(MYF(0));
- 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);
- if ((cs= all_charsets[cs_number]))
- {
- if (!(cs->state & MY_CS_COMPILED) && !(cs->state & MY_CS_LOADED))
- {
- strxmov(get_charsets_dir(buf), cs->csname, ".xml", NullS);
- my_read_charset_file(buf,flags);
- }
- cs= (cs->state & MY_CS_AVAILABLE) ? cs : NULL;
- }
- if (cs && !(cs->state & MY_CS_READY))
- {
- if ((cs->cset->init && cs->cset->init(cs, cs_alloc)) ||
- (cs->coll->init && cs->coll->init(cs, cs_alloc)))
- cs= NULL;
- else
- cs->state|= MY_CS_READY;
- }
- pthread_mutex_unlock(&THR_LOCK_charset);
- return cs;
- }
- CHARSET_INFO *get_charset(uint cs_number, myf flags)
- {
- CHARSET_INFO *cs;
- if (cs_number == default_charset_info->number)
- return default_charset_info;
- (void) init_available_charsets(MYF(0)); /* If it isn't initialized */
-
- if (!cs_number || cs_number >= array_elements(all_charsets)-1)
- 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_collation_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_COLLATION, MYF(ME_BELL), cs_name, index_file);
- }
- return cs;
- }
- CHARSET_INFO *get_charset_by_csname(const char *cs_name,
- uint cs_flags,
- myf flags)
- {
- uint cs_number;
- CHARSET_INFO *cs;
- DBUG_ENTER("get_charset_by_csname");
- DBUG_PRINT("enter",("name: '%s'", cs_name));
- (void) init_available_charsets(MYF(0)); /* If it isn't initialized */
-
- cs_number= get_charset_number(cs_name, cs_flags);
- 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);
- }
- DBUG_RETURN(cs);
- }
- ulong escape_string_for_mysql(CHARSET_INFO *charset_info, char *to,
- const char *from, ulong length)
- {
- const char *to_start= to;
- const char *end;
- #ifdef USE_MB
- my_bool use_mb_flag= use_mb(charset_info);
- #endif
- for (end= from + length; from != end; from++)
- {
- #ifdef USE_MB
- int l;
- if (use_mb_flag && (l= my_ismbchar(charset_info, from, end)))
- {
- while (l--)
- *to++= *from++;
- from--;
- continue;
- }
- /*
- If the next character appears to begin a multi-byte character, we
- escape that first byte of that apparent multi-byte character. (The
- character just looks like a multi-byte character -- if it were actually
- a multi-byte character, it would have been passed through in the test
- above.)
- Without this check, we can create a problem by converting an invalid
- multi-byte character into a valid one. For example, 0xbf27 is not
- a valid GBK character, but 0xbf5c is. (0x27 = ', 0x5c = )
- */
- if (use_mb_flag && (l= my_mbcharlen(charset_info, *from)) > 1)
- {
- *to++= '\';
- *to++= *from;
- continue;
- }
- #endif
- switch (*from) {
- case 0: /* Must be escaped for 'mysql' */
- *to++= '\';
- *to++= '0';
- break;
- case 'n': /* Must be escaped for logs */
- *to++= '\';
- *to++= 'n';
- break;
- case 'r':
- *to++= '\';
- *to++= 'r';
- break;
- case '\':
- *to++= '\';
- *to++= '\';
- break;
- case ''':
- *to++= '\';
- *to++= ''';
- break;
- case '"': /* Better safe than sorry */
- *to++= '\';
- *to++= '"';
- break;
- case ' 32': /* This gives problems on Win32 */
- *to++= '\';
- *to++= 'Z';
- break;
- default:
- *to++= *from;
- }
- }
- *to= 0;
- return (ulong) (to - to_start);
- }
- #ifdef BACKSLASH_MBTAIL
- static CHARSET_INFO *fs_cset_cache= NULL;
- CHARSET_INFO *fs_character_set()
- {
- if (!fs_cset_cache)
- {
- char buf[10]= "cp";
- GetLocaleInfo(LOCALE_SYSTEM_DEFAULT, LOCALE_IDEFAULTANSICODEPAGE,
- buf+2, sizeof(buf)-3);
- /*
- We cannot call get_charset_by_name here
- because fs_character_set() is executed before
- LOCK_THD_charset mutex initialization, which
- is used inside get_charset_by_name.
- As we're now interested in cp932 only,
- let's just detect it using strcmp().
- */
- fs_cset_cache= !strcmp(buf, "cp932") ?
- &my_charset_cp932_japanese_ci : &my_charset_bin;
- }
- return fs_cset_cache;
- }
- #endif