/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. Copyright (c) 2009, 2014, SkySQL 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; version 2 of the License. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ #include "strings_def.h" #include #include /* This files implements routines which parse XML based character set and collation description files. Unicode collations are encoded according to Unicode Technical Standard #35 Locale Data Markup Language (LDML) http://www.unicode.org/reports/tr35/ and converted into ICU string according to Collation Customization http://oss.software.ibm.com/icu/userguide/Collate_Customization.html */ /* Avoid using my_snprintf We cannot use my_snprintf() here, because ctype.o is used to build conf_to_src, which must require minimun dependency. */ #undef my_snprinf #define my_snprintf "We cannot use my_snprintf in this file" int (*my_string_stack_guard)(int)= NULL; static char *mstr(char *str,const char *src,size_t l1,size_t l2) { l1= l1str; s++) { if (!strncmp(attr, s->str, len) && s->str[len] == 0) return s; } return NULL; } #define MY_CS_CSDESCR_SIZE 64 #define MY_CS_TAILORING_SIZE (32*1024) #define MY_CS_UCA_VERSION_SIZE 64 #define MY_CS_CONTEXT_SIZE 64 typedef struct my_cs_file_info { char csname[MY_CS_NAME_SIZE]; char name[MY_CS_NAME_SIZE]; uchar ctype[MY_CS_CTYPE_TABLE_SIZE]; uchar to_lower[MY_CS_TO_LOWER_TABLE_SIZE]; uchar to_upper[MY_CS_TO_UPPER_TABLE_SIZE]; uchar sort_order[MY_CS_SORT_ORDER_TABLE_SIZE]; uint16 tab_to_uni[MY_CS_TO_UNI_TABLE_SIZE]; char comment[MY_CS_CSDESCR_SIZE]; char *tailoring; size_t tailoring_length; size_t tailoring_alloced_length; char context[MY_CS_CONTEXT_SIZE]; struct charset_info_st cs; MY_CHARSET_LOADER *loader; } MY_CHARSET_FILE; static void my_charset_file_reset_charset(MY_CHARSET_FILE *i) { memset(&i->cs, 0, sizeof(i->cs)); } static void my_charset_file_reset_collation(MY_CHARSET_FILE *i) { i->tailoring_length= 0; i->context[0]= '\0'; } static void my_charset_file_init(MY_CHARSET_FILE *i) { my_charset_file_reset_charset(i); my_charset_file_reset_collation(i); i->tailoring= NULL; i->tailoring_alloced_length= 0; } static void my_charset_file_free(MY_CHARSET_FILE *i) { i->loader->free(i->tailoring); } static int my_charset_file_tailoring_realloc(MY_CHARSET_FILE *i, size_t newlen) { if (i->tailoring_alloced_length > newlen || (i->tailoring= i->loader->realloc(i->tailoring, (i->tailoring_alloced_length= (newlen + 32*1024))))) { return MY_XML_OK; } return MY_XML_ERROR; } static int fill_uchar(uchar *a,uint size,const char *str, size_t len) { uint i= 0; const char *s, *b, *e=str+len; for (s=str ; s < e ; i++) { for ( ; (s < e) && strchr(" \t\r\n",s[0]); s++) ; b=s; for ( ; (s < e) && !strchr(" \t\r\n",s[0]); s++) ; if (s == b || i > size) break; a[i]= (uchar) strtoul(b,NULL,16); } return 0; } static int fill_uint16(uint16 *a,uint size,const char *str, size_t len) { uint i= 0; const char *s, *b, *e=str+len; for (s=str ; s < e ; i++) { for ( ; (s < e) && strchr(" \t\r\n",s[0]); s++) ; b=s; for ( ; (s < e) && !strchr(" \t\r\n",s[0]); s++) ; if (s == b || i > size) break; a[i]= (uint16) strtol(b,NULL,16); } return 0; } static int tailoring_append(MY_XML_PARSER *st, const char *fmt, size_t len, const char *attr) { struct my_cs_file_info *i= (struct my_cs_file_info *) st->user_data; size_t newlen= i->tailoring_length + len + 64; /* 64 for format */ if (MY_XML_OK == my_charset_file_tailoring_realloc(i, newlen)) { char *dst= i->tailoring + i->tailoring_length; sprintf(dst, fmt, (int) len, attr); i->tailoring_length+= strlen(dst); return MY_XML_OK; } return MY_XML_ERROR; } static int tailoring_append2(MY_XML_PARSER *st, const char *fmt, size_t len1, const char *attr1, size_t len2, const char *attr2) { struct my_cs_file_info *i= (struct my_cs_file_info *) st->user_data; size_t newlen= i->tailoring_length + len1 + len2 + 64; /* 64 for format */ if (MY_XML_OK == my_charset_file_tailoring_realloc(i, newlen)) { char *dst= i->tailoring + i->tailoring_length; sprintf(dst, fmt, (int) len1, attr1, (int) len2, attr2); i->tailoring_length+= strlen(dst); return MY_XML_OK; } return MY_XML_ERROR; } static size_t scan_one_character(const char *s, const char *e, my_wc_t *wc) { CHARSET_INFO *cs= &my_charset_utf8_general_ci; if (s >= e) return 0; /* Escape sequence: \uXXXX */ if (s[0] == '\\' && s + 2 < e && s[1] == 'u' && my_isxdigit(cs, s[2])) { size_t len= 3; /* We have at least one digit */ for (s+= 3; s < e && my_isxdigit(cs, s[0]); s++, len++) { } wc[0]= 0; return len; } else if ((int8) s[0] > 0) /* 7-bit character */ { wc[0]= 0; return 1; } else /* Non-escaped character */ { int rc= cs->cset->mb_wc(cs, wc, (uchar *) s, (uchar *) e); if (rc > 0) return (size_t) rc; } return 0; } static int tailoring_append_abbreviation(MY_XML_PARSER *st, const char *fmt, size_t len, const char *attr) { size_t clen; const char *attrend= attr + len; my_wc_t wc; for ( ; (clen= scan_one_character(attr, attrend, &wc)) > 0; attr+= clen) { DBUG_ASSERT(attr < attrend); if (tailoring_append(st, fmt, clen, attr) != MY_XML_OK) return MY_XML_ERROR; } return MY_XML_OK; } static int cs_enter(MY_XML_PARSER *st,const char *attr, size_t len) { struct my_cs_file_info *i= (struct my_cs_file_info *)st->user_data; const struct my_cs_file_section_st *s= cs_file_sec(attr,len); int state= s ? s->state : 0; switch (state) { case 0: i->loader->reporter(WARNING_LEVEL, "Unknown LDML tag: '%.*s'", len, attr); break; case _CS_CHARSET: my_charset_file_reset_charset(i); break; case _CS_COLLATION: my_charset_file_reset_collation(i); break; case _CS_RESET: return tailoring_append(st, " &", 0, NULL); default: break; } return MY_XML_OK; } static int cs_leave(MY_XML_PARSER *st,const char *attr, size_t len) { struct my_cs_file_info *i= (struct my_cs_file_info *)st->user_data; const struct my_cs_file_section_st *s= cs_file_sec(attr,len); int state= s ? s->state : 0; int rc; switch(state){ case _CS_COLLATION: if (i->tailoring_length) i->cs.tailoring= i->tailoring; rc= i->loader->add_collation ? i->loader->add_collation(&i->cs) : MY_XML_OK; break; /* Rules: Logical Reset Positions */ case _CS_RESET_FIRST_NON_IGNORABLE: rc= tailoring_append(st, "[first non-ignorable]", 0, NULL); break; case _CS_RESET_LAST_NON_IGNORABLE: rc= tailoring_append(st, "[last non-ignorable]", 0, NULL); break; case _CS_RESET_FIRST_PRIMARY_IGNORABLE: rc= tailoring_append(st, "[first primary ignorable]", 0, NULL); break; case _CS_RESET_LAST_PRIMARY_IGNORABLE: rc= tailoring_append(st, "[last primary ignorable]", 0, NULL); break; case _CS_RESET_FIRST_SECONDARY_IGNORABLE: rc= tailoring_append(st, "[first secondary ignorable]", 0, NULL); break; case _CS_RESET_LAST_SECONDARY_IGNORABLE: rc= tailoring_append(st, "[last secondary ignorable]", 0, NULL); break; case _CS_RESET_FIRST_TERTIARY_IGNORABLE: rc= tailoring_append(st, "[first tertiary ignorable]", 0, NULL); break; case _CS_RESET_LAST_TERTIARY_IGNORABLE: rc= tailoring_append(st, "[last tertiary ignorable]", 0, NULL); break; case _CS_RESET_FIRST_TRAILING: rc= tailoring_append(st, "[first trailing]", 0, NULL); break; case _CS_RESET_LAST_TRAILING: rc= tailoring_append(st, "[last trailing]", 0, NULL); break; case _CS_RESET_FIRST_VARIABLE: rc= tailoring_append(st, "[first variable]", 0, NULL); break; case _CS_RESET_LAST_VARIABLE: rc= tailoring_append(st, "[last variable]", 0, NULL); break; default: rc=MY_XML_OK; } return rc; } static const char *diff_fmt[5]= { "<%.*s", "<<%.*s", "<<<%.*s", "<<<<%.*s", "=%.*s" }; static const char *context_diff_fmt[5]= { "<%.*s|%.*s", "<<%.*s|%.*s", "<<<%.*s|%.*s", "<<<<%.*s|%.*s", "=%.*s|%.*s" }; static int cs_value(MY_XML_PARSER *st,const char *attr, size_t len) { struct my_cs_file_info *i= (struct my_cs_file_info *)st->user_data; const struct my_cs_file_section_st *s; int state= (int)((s= cs_file_sec(st->attr.start, st->attr.end - st->attr.start)) ? s->state : 0); int rc= MY_XML_OK; switch (state) { case _CS_MISC: case _CS_FAMILY: case _CS_ORDER: break; case _CS_ID: i->cs.number= strtol(attr,(char**)NULL,10); break; case _CS_BINARY_ID: i->cs.binary_number= strtol(attr,(char**)NULL,10); break; case _CS_PRIMARY_ID: i->cs.primary_number= strtol(attr,(char**)NULL,10); break; case _CS_COLNAME: i->cs.name=mstr(i->name,attr,len,MY_CS_NAME_SIZE-1); break; case _CS_CSNAME: i->cs.csname=mstr(i->csname,attr,len,MY_CS_NAME_SIZE-1); break; case _CS_CSDESCRIPT: i->cs.comment=mstr(i->comment,attr,len,MY_CS_CSDESCR_SIZE-1); break; case _CS_FLAG: if (!strncmp("primary",attr,len)) i->cs.state|= MY_CS_PRIMARY; else if (!strncmp("binary",attr,len)) i->cs.state|= MY_CS_BINSORT; else if (!strncmp("compiled",attr,len)) i->cs.state|= MY_CS_COMPILED; break; case _CS_UPPERMAP: fill_uchar(i->to_upper,MY_CS_TO_UPPER_TABLE_SIZE,attr,len); i->cs.to_upper=i->to_upper; break; case _CS_LOWERMAP: fill_uchar(i->to_lower,MY_CS_TO_LOWER_TABLE_SIZE,attr,len); i->cs.to_lower=i->to_lower; break; case _CS_UNIMAP: fill_uint16(i->tab_to_uni,MY_CS_TO_UNI_TABLE_SIZE,attr,len); i->cs.tab_to_uni=i->tab_to_uni; break; case _CS_COLLMAP: fill_uchar(i->sort_order,MY_CS_SORT_ORDER_TABLE_SIZE,attr,len); i->cs.sort_order=i->sort_order; break; case _CS_CTYPEMAP: fill_uchar(i->ctype,MY_CS_CTYPE_TABLE_SIZE,attr,len); i->cs.ctype=i->ctype; break; /* Special purpose commands */ case _CS_UCA_VERSION: rc= tailoring_append(st, "[version %.*s]", len, attr); break; case _CS_CL_SUPPRESS_CONTRACTIONS: rc= tailoring_append(st, "[suppress contractions %.*s]", len, attr); break; case _CS_CL_OPTIMIZE: rc= tailoring_append(st, "[optimize %.*s]", len, attr); break; case _CS_CL_SHIFT_AFTER_METHOD: rc= tailoring_append(st, "[shift-after-method %.*s]", len, attr); break; /* Collation Settings */ case _CS_ST_STRENGTH: /* 1, 2, 3, 4, 5, or primary, secondary, tertiary, quaternary, identical */ rc= tailoring_append(st, "[strength %.*s]", len, attr); break; case _CS_ST_ALTERNATE: /* non-ignorable, shifted */ rc= tailoring_append(st, "[alternate %.*s]", len, attr); break; case _CS_ST_BACKWARDS: /* on, off, 2 */ rc= tailoring_append(st, "[backwards %.*s]", len, attr); break; case _CS_ST_NORMALIZATION: /* TODO for WL#896: check collations for normalization: vi.xml We want precomposed characters work well at this point. */ /* on, off */ rc= tailoring_append(st, "[normalization %.*s]", len, attr); break; case _CS_ST_CASE_LEVEL: /* on, off */ rc= tailoring_append(st, "[caseLevel %.*s]", len, attr); break; case _CS_ST_CASE_FIRST: /* upper, lower, off */ rc= tailoring_append(st, "[caseFirst %.*s]", len, attr); break; case _CS_ST_HIRAGANA_QUATERNARY: /* on, off */ rc= tailoring_append(st, "[hiraganaQ %.*s]", len, attr); break; case _CS_ST_NUMERIC: /* on, off */ rc= tailoring_append(st, "[numeric %.*s]", len, attr); break; case _CS_ST_VARIABLE_TOP: /* TODO for WL#896: check value format */ rc= tailoring_append(st, "[variableTop %.*s]", len, attr); break; case _CS_ST_MATCH_BOUNDARIES: /* none, whole-character, whole-word */ rc= tailoring_append(st, "[match-boundaries %.*s]", len, attr); break; case _CS_ST_MATCH_STYLE: /* minimal, medial, maximal */ rc= tailoring_append(st, "[match-style %.*s]", len, attr); break; /* Rules */ case _CS_RESET: rc= tailoring_append(st, "%.*s", len, attr); break; case _CS_DIFF1: case _CS_DIFF2: case _CS_DIFF3: case _CS_DIFF4: case _CS_IDENTICAL: rc= tailoring_append(st, diff_fmt[state - _CS_DIFF1], len, attr); break; /* Rules: Expansion */ case _CS_EXP_EXTEND: rc= tailoring_append(st, " / %.*s", len, attr); break; case _CS_EXP_DIFF1: case _CS_EXP_DIFF2: case _CS_EXP_DIFF3: case _CS_EXP_DIFF4: case _CS_EXP_IDENTICAL: if (i->context[0]) { rc= tailoring_append2(st, context_diff_fmt[state - _CS_EXP_DIFF1], strlen(i->context), i->context, len, attr); i->context[0]= 0; } else rc= tailoring_append(st, diff_fmt[state - _CS_EXP_DIFF1], len, attr); break; /* Rules: Context */ case _CS_CONTEXT: if (len < sizeof(i->context)) { memcpy(i->context, attr, len); i->context[len]= '\0'; } break; /* Rules: Abbreviating Ordering Specifications */ case _CS_A_DIFF1: case _CS_A_DIFF2: case _CS_A_DIFF3: case _CS_A_DIFF4: case _CS_A_IDENTICAL: rc= tailoring_append_abbreviation(st, diff_fmt[state - _CS_A_DIFF1], len, attr); break; /* Rules: Placing Characters Before Others */ case _CS_RESET_BEFORE: /* TODO for WL#896: Add this check into text customization parser: It is an error if the strength of the before relation is not identical to the relation after the reset. We'll need this for WL#896. */ rc= tailoring_append(st, "[before %.*s]", len, attr); break; default: break; } return rc; } my_bool my_parse_charset_xml(MY_CHARSET_LOADER *loader, const char *buf, size_t len) { MY_XML_PARSER p; struct my_cs_file_info info; my_bool rc; my_charset_file_init(&info); my_xml_parser_create(&p); my_xml_set_enter_handler(&p,cs_enter); my_xml_set_value_handler(&p,cs_value); my_xml_set_leave_handler(&p,cs_leave); info.loader= loader; my_xml_set_user_data(&p, (void *) &info); rc= (my_xml_parse(&p,buf,len) == MY_XML_OK) ? FALSE : TRUE; my_xml_parser_free(&p); my_charset_file_free(&info); if (rc != MY_XML_OK) { const char *errstr= my_xml_error_string(&p); if (sizeof(loader->error) > 32 + strlen(errstr)) { /* We cannot use my_snprintf() here. See previous comment. */ sprintf(loader->error, "at line %d pos %d: %s", my_xml_error_lineno(&p)+1, (int) my_xml_error_pos(&p), my_xml_error_string(&p)); } } return rc; } uint my_string_repertoire_8bit(CHARSET_INFO *cs, const char *str, ulong length) { const char *strend; if ((cs->state & MY_CS_NONASCII) && length > 0) return MY_REPERTOIRE_UNICODE30; for (strend= str + length; str < strend; str++) { if (((uchar) *str) > 0x7F) return MY_REPERTOIRE_UNICODE30; } return MY_REPERTOIRE_ASCII; } static void my_string_metadata_init(MY_STRING_METADATA *metadata) { metadata->repertoire= MY_REPERTOIRE_ASCII; metadata->char_length= 0; } /** This should probably eventually go as a virtual function into MY_CHARSET_HANDLER or MY_COLLATION_HANDLER. */ static void my_string_metadata_get_mb(MY_STRING_METADATA *metadata, CHARSET_INFO *cs, const char *str, ulong length) { const char *strend= str + length; for (my_string_metadata_init(metadata) ; str < strend; metadata->char_length++) { my_wc_t wc; int mblen= cs->cset->mb_wc(cs, &wc, (const uchar *) str, (const uchar *) strend); if (mblen > 0) /* Assigned character */ { if (wc > 0x7F) metadata->repertoire|= MY_REPERTOIRE_EXTENDED; str+= mblen; } else if (mblen == MY_CS_ILSEQ) /* Bad byte sequence */ { metadata->repertoire|= MY_REPERTOIRE_EXTENDED; str++; } else if (mblen > MY_CS_TOOSMALL) /* Unassigned character */ { metadata->repertoire|= MY_REPERTOIRE_EXTENDED; str+= (-mblen); } else /* Incomplete character, premature end-of-line */ { metadata->repertoire|= MY_REPERTOIRE_EXTENDED; /* Just in case */ break; } } } /** Collect string metadata: length in characters and repertoire. */ void my_string_metadata_get(MY_STRING_METADATA *metadata, CHARSET_INFO *cs, const char *str, size_t length) { if (cs->mbmaxlen == 1 && !(cs->state & MY_CS_NONASCII)) { metadata->char_length= length; metadata->repertoire= my_string_repertoire_8bit(cs, str, length); } else { my_string_metadata_get_mb(metadata, cs, str, length); } } /* Check repertoire: detect pure ascii strings */ uint my_string_repertoire(CHARSET_INFO *cs, const char *str, ulong length) { if (cs->mbminlen == 1 && !(cs->state & MY_CS_NONASCII)) { return my_string_repertoire_8bit(cs, str, length); } else { const char *strend= str + length; my_wc_t wc; int chlen; for (; (chlen= cs->cset->mb_wc(cs, &wc, (uchar*) str, (uchar*) strend)) > 0; str+= chlen) { if (wc > 0x7F) return MY_REPERTOIRE_UNICODE30; } } return MY_REPERTOIRE_ASCII; } /* Returns repertoire for charset */ uint my_charset_repertoire(CHARSET_INFO *cs) { return cs->state & MY_CS_PUREASCII ? MY_REPERTOIRE_ASCII : MY_REPERTOIRE_UNICODE30; } /* Detect whether a character set is ASCII compatible. Returns TRUE for: - all 8bit character sets whose Unicode mapping of 0x7B is '{' (ignores swe7 which maps 0x7B to "LATIN LETTER A WITH DIAERESIS") - all multi-byte character sets having mbminlen == 1 (ignores ucs2 whose mbminlen is 2) TODO: When merging to 5.2, this function should be changed to check a new flag MY_CS_NONASCII, return (cs->flag & MY_CS_NONASCII) ? 0 : 1; This flag was previously added into 5.2 under terms of WL#3759 "Optimize identifier conversion in client-server protocol" especially to mark character sets not compatible with ASCII. We won't backport this flag to 5.0 or 5.1. This function is Ok for 5.0 and 5.1, because we're not going to introduce new tricky character sets between 5.0 and 5.2. */ my_bool my_charset_is_ascii_based(CHARSET_INFO *cs) { return (cs->mbmaxlen == 1 && cs->tab_to_uni && cs->tab_to_uni['{'] == '{') || (cs->mbminlen == 1 && cs->mbmaxlen > 1); } /* Detect if a character set is 8bit, and it is pure ascii, i.e. doesn't have characters outside U+0000..U+007F This functions is shared between "conf_to_src" and dynamic charsets loader in "mysqld". */ my_bool my_charset_is_8bit_pure_ascii(CHARSET_INFO *cs) { size_t code; if (!cs->tab_to_uni) return 0; for (code= 0; code < 256; code++) { if (cs->tab_to_uni[code] > 0x7F) return 0; } return 1; } /* Shared function between conf_to_src and mysys. Check if a 8bit character set is compatible with ascii on the range 0x00..0x7F. */ my_bool my_charset_is_ascii_compatible(CHARSET_INFO *cs) { uint i; if (!cs->tab_to_uni) return 1; for (i= 0; i < 128; i++) { if (cs->tab_to_uni[i] != i) return 0; } return 1; } /* Convert a string between two character sets. 'to' must be large enough to store (form_length * to_cs->mbmaxlen) bytes. @param to[OUT] Store result here @param to_length Size of "to" buffer @param to_cs Character set of result string @param from Copy from here @param from_length Length of the "from" string @param from_cs Character set of the "from" string @param errors[OUT] Number of conversion errors @return Number of bytes copied to 'to' string */ uint32 my_convert_using_func(char *to, uint32 to_length, CHARSET_INFO *to_cs, my_charset_conv_wc_mb wc_mb, const char *from, uint32 from_length, CHARSET_INFO *from_cs, my_charset_conv_mb_wc mb_wc, uint *errors) { int cnvres; my_wc_t wc; const uchar *from_end= (const uchar*) from + from_length; char *to_start= to; uchar *to_end= (uchar*) to + to_length; uint error_count= 0; while (1) { if ((cnvres= (*mb_wc)(from_cs, &wc, (uchar*) from, from_end)) > 0) from+= cnvres; else if (cnvres == MY_CS_ILSEQ) { error_count++; from++; wc= '?'; } else if (cnvres > MY_CS_TOOSMALL) { /* A correct multibyte sequence detected But it doesn't have Unicode mapping. */ error_count++; from+= (-cnvres); wc= '?'; } else { if ((uchar *) from >= from_end) break; /* End of line */ /* Incomplete byte sequence */ error_count++; from++; wc= '?'; } outp: if ((cnvres= (*wc_mb)(to_cs, wc, (uchar*) to, to_end)) > 0) to+= cnvres; else if (cnvres == MY_CS_ILUNI && wc != '?') { error_count++; wc= '?'; goto outp; } else break; } *errors= error_count; return (uint32) (to - to_start); } /* Convert a string between two character sets. Optimized for quick copying of ASCII characters in the range 0x00..0x7F. 'to' must be large enough to store (form_length * to_cs->mbmaxlen) bytes. @param to[OUT] Store result here @param to_length Size of "to" buffer @param to_cs Character set of result string @param from Copy from here @param from_length Length of the "from" string @param from_cs Character set of the "from" string @param errors[OUT] Number of conversion errors @return Number of bytes copied to 'to' string */ uint32 my_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs, const char *from, uint32 from_length, CHARSET_INFO *from_cs, uint *errors) { uint32 length, length2; /* If any of the character sets is not ASCII compatible, immediately switch to slow mb_wc->wc_mb method. */ if ((to_cs->state | from_cs->state) & MY_CS_NONASCII) return my_convert_using_func(to, to_length, to_cs, to_cs->cset->wc_mb, from, from_length, from_cs, from_cs->cset->mb_wc, errors); length= length2= MY_MIN(to_length, from_length); #if defined(__i386__) || defined(__x86_64__) /* Special loop for i386, it allows to refer to a non-aligned memory block as UINT32, which makes it possible to copy four bytes at once. This gives about 10% performance improvement comparing to byte-by-byte loop. */ for ( ; length >= 4; length-= 4, from+= 4, to+= 4) { if ((*(uint32*)from) & 0x80808080) break; *((uint32*) to)= *((const uint32*) from); } #endif /* __i386__ */ for (; ; *to++= *from++, length--) { if (!length) { *errors= 0; return length2; } if (*((unsigned char*) from) > 0x7F) /* A non-ASCII character */ { uint32 copied_length= length2 - length; to_length-= copied_length; from_length-= copied_length; return copied_length + my_convert_using_func(to, to_length, to_cs, to_cs->cset->wc_mb, from, from_length, from_cs, from_cs->cset->mb_wc, errors); } } DBUG_ASSERT(FALSE); // Should never get to here return 0; // Make compiler happy } size_t my_convert_fix(CHARSET_INFO *to_cs, char *to, size_t to_length, CHARSET_INFO *from_cs, const char *from, size_t from_length, size_t nchars, MY_STRCONV_STATUS *status) { int cnvres; my_wc_t wc; my_charset_conv_mb_wc mb_wc= from_cs->cset->mb_wc; my_charset_conv_wc_mb wc_mb= to_cs->cset->wc_mb; const uchar *from_end= (const uchar*) from + from_length; uchar *to_end= (uchar*) to + to_length; char *to_start= to; DBUG_ASSERT(to_cs != &my_charset_bin); DBUG_ASSERT(from_cs != &my_charset_bin); status->m_native_copy_status.m_well_formed_error_pos= NULL; status->m_cannot_convert_error_pos= NULL; for ( ; nchars; nchars--) { const char *from_prev= from; if ((cnvres= (*mb_wc)(from_cs, &wc, (uchar*) from, from_end)) > 0) from+= cnvres; else if (cnvres == MY_CS_ILSEQ) { if (!status->m_native_copy_status.m_well_formed_error_pos) status->m_native_copy_status.m_well_formed_error_pos= from; from++; wc= '?'; } else if (cnvres > MY_CS_TOOSMALL) { /* A correct multibyte sequence detected But it doesn't have Unicode mapping. */ if (!status->m_cannot_convert_error_pos) status->m_cannot_convert_error_pos= from; from+= (-cnvres); wc= '?'; } else { if ((uchar *) from >= from_end) break; // End of line // Incomplete byte sequence if (!status->m_native_copy_status.m_well_formed_error_pos) status->m_native_copy_status.m_well_formed_error_pos= from; from++; wc= '?'; } outp: if ((cnvres= (*wc_mb)(to_cs, wc, (uchar*) to, to_end)) > 0) to+= cnvres; else if (cnvres == MY_CS_ILUNI && wc != '?') { if (!status->m_cannot_convert_error_pos) status->m_cannot_convert_error_pos= from_prev; wc= '?'; goto outp; } else { from= from_prev; break; } } status->m_native_copy_status.m_source_end_pos= from; return to - to_start; }