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Commite2d088d

Browse files
committed
Allow direct conversion between EUC_JP and SJIS to improve
performance. patches submitted by Atsushi Ogawa.
1 parent1fa87fa commite2d088d

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1 file changed

+201
-11
lines changed

1 file changed

+201
-11
lines changed

‎src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c‎

Lines changed: 201 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
* Portions Copyright (c) 1994, Regents of the University of California
77
*
88
* IDENTIFICATION
9-
* $PostgreSQL: pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c,v 1.10 2005/06/10 16:43:56 ishii Exp $
9+
* $PostgreSQL: pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c,v 1.11 2005/06/24 13:56:39 ishii Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
@@ -58,23 +58,21 @@ static void sjis2mic(unsigned char *sjis, unsigned char *p, int len);
5858
staticvoidmic2sjis(unsignedchar*mic,unsignedchar*p,intlen);
5959
staticvoideuc_jp2mic(unsignedchar*euc,unsignedchar*p,intlen);
6060
staticvoidmic2euc_jp(unsignedchar*mic,unsignedchar*p,intlen);
61+
staticvoideuc_jp2sjis(unsignedchar*mic,unsignedchar*p,intlen);
62+
staticvoidsjis2euc_jp(unsignedchar*mic,unsignedchar*p,intlen);
6163

6264
Datum
6365
euc_jp_to_sjis(PG_FUNCTION_ARGS)
6466
{
6567
unsignedchar*src=PG_GETARG_CSTRING(2);
6668
unsignedchar*dest=PG_GETARG_CSTRING(3);
6769
intlen=PG_GETARG_INT32(4);
68-
unsignedchar*buf;
6970

7071
Assert(PG_GETARG_INT32(0)==PG_EUC_JP);
7172
Assert(PG_GETARG_INT32(1)==PG_SJIS);
7273
Assert(len >=0);
7374

74-
buf=palloc(len*ENCODING_GROWTH_RATE);
75-
euc_jp2mic(src,buf,len);
76-
mic2sjis(buf,dest,strlen(buf));
77-
pfree(buf);
75+
euc_jp2sjis(src,dest,len);
7876

7977
PG_RETURN_VOID();
8078
}
@@ -85,16 +83,12 @@ sjis_to_euc_jp(PG_FUNCTION_ARGS)
8583
unsignedchar*src=PG_GETARG_CSTRING(2);
8684
unsignedchar*dest=PG_GETARG_CSTRING(3);
8785
intlen=PG_GETARG_INT32(4);
88-
unsignedchar*buf;
8986

9087
Assert(PG_GETARG_INT32(0)==PG_SJIS);
9188
Assert(PG_GETARG_INT32(1)==PG_EUC_JP);
9289
Assert(len >=0);
9390

94-
buf=palloc(len*ENCODING_GROWTH_RATE);
95-
sjis2mic(src,buf,len);
96-
mic2euc_jp(buf,dest,strlen(buf));
97-
pfree(buf);
91+
sjis2euc_jp(src,dest,len);
9892

9993
PG_RETURN_VOID();
10094
}
@@ -454,3 +448,199 @@ mic2euc_jp(unsigned char *mic, unsigned char *p, int len)
454448
}
455449
*p='\0';
456450
}
451+
452+
/*
453+
* EUC_JP -> SJIS
454+
*/
455+
staticvoid
456+
euc_jp2sjis(unsignedchar*euc,unsignedchar*p,intlen)
457+
{
458+
intc1,
459+
c2,
460+
k;
461+
unsignedchar*euc_end=euc+len;
462+
463+
while (euc_end >=euc&& (c1=*euc++))
464+
{
465+
if(c1<0x80)
466+
{
467+
/* should be ASCII */
468+
*p++=c1;
469+
}
470+
elseif (c1==SS2)
471+
{
472+
/* hankaku kana? */
473+
*p++=*euc++;
474+
}
475+
elseif (c1==SS3)
476+
{
477+
/* JIS X0212 kanji? */
478+
c1=*euc++;
479+
c2=*euc++;
480+
k=c1 <<8 |c2;
481+
if (k >=0xf5a1)
482+
{
483+
/* UDC2 */
484+
c1-=0x54;
485+
*p++= ((c1-0xa1) >>1)+ ((c1<0xdf) ?0x81 :0xc1)+0x74;
486+
*p++=c2- ((c1&1) ? ((c2<0xe0) ?0x61 :0x60) :2);
487+
}
488+
else
489+
{
490+
inti,k2;
491+
492+
/* IBM kanji */
493+
for (i=0;;i++)
494+
{
495+
k2=ibmkanji[i].euc&0xffff;
496+
if (k2==0xffff)
497+
{
498+
*p++=PGSJISALTCODE >>8;
499+
*p++=PGSJISALTCODE&0xff;
500+
break;
501+
}
502+
if (k2==k)
503+
{
504+
k=ibmkanji[i].sjis;
505+
*p++=k >>8;
506+
*p++=k&0xff;
507+
break;
508+
}
509+
}
510+
}
511+
}
512+
else
513+
{
514+
/* JIS X0208 kanji? */
515+
c2=*euc++;
516+
k= (c1 <<8) | (c2&0xff);
517+
if (k >=0xf5a1)
518+
{
519+
/* UDC1 */
520+
c1-=0x54;
521+
*p++= ((c1-0xa1) >>1)+ ((c1<0xdf) ?0x81 :0xc1)+0x6f;
522+
}
523+
else
524+
*p++= ((c1-0xa1) >>1)+ ((c1<0xdf) ?0x81 :0xc1);
525+
*p++=c2- ((c1&1) ? ((c2<0xe0) ?0x61 :0x60) :2);
526+
}
527+
}
528+
*p='\0';
529+
}
530+
531+
/*
532+
* SJIS ---> EUC_JP
533+
*/
534+
staticvoid
535+
sjis2euc_jp(unsignedchar*sjis,unsignedchar*p,intlen)
536+
{
537+
intc1,
538+
c2,
539+
i,
540+
k,
541+
k2;
542+
unsignedchar*sjis_end=sjis+len;
543+
544+
while (sjis_end >=sjis&& (c1=*sjis++))
545+
{
546+
if(c1<0x80)
547+
{
548+
/* should be ASCII */
549+
*p++=c1;
550+
}
551+
elseif (c1 >=0xa1&&c1 <=0xdf)
552+
{
553+
/* JIS X0201 (1 byte kana) */
554+
*p++=SS2;
555+
*p++=c1;
556+
}
557+
else
558+
{
559+
/*
560+
* JIS X0208, X0212, user defined extended characters
561+
*/
562+
c2=*sjis++;
563+
k= (c1 <<8)+c2;
564+
if (k >=0xed40&&k<0xf040)
565+
{
566+
/* NEC selection IBM kanji */
567+
for (i=0;;i++)
568+
{
569+
k2=ibmkanji[i].nec;
570+
if (k2==0xffff)
571+
break;
572+
if (k2==k)
573+
{
574+
k=ibmkanji[i].sjis;
575+
c1= (k >>8)&0xff;
576+
c2=k&0xff;
577+
}
578+
}
579+
}
580+
581+
if (k<0xeb3f)
582+
{
583+
/* JIS X0208 */
584+
*p++= ((c1&0x3f) <<1)+0x9f+ (c2>0x9e);
585+
*p++=c2+ ((c2>0x9e) ?2 :0x60)+ (c2<0x80);
586+
}
587+
elseif ((k >=0xeb40&&k<0xf040)|| (k >=0xfc4c&&k <=0xfcfc))
588+
{
589+
/* NEC selection IBM kanji - Other undecided justice */
590+
*p++=PGEUCALTCODE >>8;
591+
*p++=PGEUCALTCODE&0xff;
592+
}
593+
elseif (k >=0xf040&&k<0xf540)
594+
{
595+
/*
596+
* UDC1 mapping to X0208 85 ku - 94 ku JIS code 0x7521 -
597+
* 0x7e7e EUC 0xf5a1 - 0xfefe
598+
*/
599+
c1-=0x6f;
600+
*p++= ((c1&0x3f) <<1)+0xf3+ (c2>0x9e);
601+
*p++=c2+ ((c2>0x9e) ?2 :0x60)+ (c2<0x80);
602+
}
603+
elseif (k >=0xf540&&k<0xfa40)
604+
{
605+
/*
606+
* UDC2 mapping to X0212 85 ku - 94 ku JIS code 0x7521 -
607+
* 0x7e7e EUC 0x8ff5a1 - 0x8ffefe
608+
*/
609+
*p++=SS3;
610+
c1-=0x74;
611+
*p++= ((c1&0x3f) <<1)+0xf3+ (c2>0x9e);
612+
*p++=c2+ ((c2>0x9e) ?2 :0x60)+ (c2<0x80);
613+
}
614+
elseif (k >=0xfa40)
615+
{
616+
/*
617+
* mapping IBM kanji to X0208 and X0212
618+
*
619+
*/
620+
for (i=0;;i++)
621+
{
622+
k2=ibmkanji[i].sjis;
623+
if (k2==0xffff)
624+
break;
625+
if (k2==k)
626+
{
627+
k=ibmkanji[i].euc;
628+
if (k >=0x8f0000)
629+
{
630+
*p++=SS3;
631+
*p++=0x80 | ((k&0xff00) >>8);
632+
*p++=0x80 | (k&0xff);
633+
}
634+
else
635+
{
636+
*p++=0x80 | (k >>8);
637+
*p++=0x80 | (k&0xff);
638+
}
639+
}
640+
}
641+
}
642+
}
643+
}
644+
*p='\0';
645+
}
646+

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