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Allocate memory when a character set is requested:

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- For simple character sets: from_uni convertion table.
- For UCA: alternative weight arrays.
Use mbminlen instead of MY_CS_NONTEXT
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unknown
2004-06-11 16:29:16 +05:00
parent 4047b5ade3
commit 5275eb21c2
22 changed files with 608 additions and 560 deletions
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100
strings/ctype-simple.c
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@ -1142,8 +1142,107 @@ skip:
}
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, void *(*alloc)(uint))
{
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;
if (!(idx[i].uidx.tab=(uchar*) alloc(numchars * sizeof(*idx[i].uidx.tab))))
return TRUE;
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;
if (!(cs->tab_from_uni= (MY_UNI_IDX*) alloc(sizeof(MY_UNI_IDX)*(n+1))))
return TRUE;
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 my_bool my_cset_init_8bit(CHARSET_INFO *cs, void *(*alloc)(uint))
{
return create_fromuni(cs, alloc);
}
MY_CHARSET_HANDLER my_charset_8bit_handler=
{
my_cset_init_8bit,
NULL, /* ismbchar */
my_mbcharlen_8bit, /* mbcharlen */
my_numchars_8bit,
@ -1170,6 +1269,7 @@ MY_CHARSET_HANDLER my_charset_8bit_handler=
MY_COLLATION_HANDLER my_collation_8bit_simple_ci_handler =
{
NULL, /* init */
my_strnncoll_simple,
my_strnncollsp_simple,
my_strnxfrm_simple,