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Fix long standing Asian multibyte charsets bug.

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Subject: [HACKERS] bugs with certain Asian multibyte charsets
From: Tatsuo Ishii <ishii@sraoss.co.jp>
To: pgsql-hackers@postgresql.org
Date: Sat, 24 Dec 2005 18:25:33 +0900 (JST)

for more details/
This commit is contained in:
Tatsuo Ishii 2005-12-24 09:35:36 +00:00
parent 7d732f06cc
commit 804f6b8fc9
1 changed files with 23 additions and 22 deletions
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45
src/backend/utils/mb/wchar.c
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@ -1,7 +1,7 @@
/* /*
* conversion functions between pg_wchar and multibyte streams. * conversion functions between pg_wchar and multibyte streams.
* Tatsuo Ishii * Tatsuo Ishii
* $PostgreSQL: pgsql/src/backend/utils/mb/wchar.c,v 1.47 2005/10/29 00:31:52 petere Exp $ * $PostgreSQL: pgsql/src/backend/utils/mb/wchar.c,v 1.48 2005/12/24 09:35:36 ishii Exp $
* *
* WIN1250 client encoding updated by Pavel Behal * WIN1250 client encoding updated by Pavel Behal
* *
@ -58,7 +58,6 @@ pg_ascii_dsplen(const unsigned char *s)
/* /*
* EUC * EUC
*/ */
static int pg_euc2wchar_with_len static int pg_euc2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len) (const unsigned char *from, pg_wchar *to, int len)
{ {
@ -66,26 +65,26 @@ static int pg_euc2wchar_with_len
while (len > 0 && *from) while (len > 0 && *from)
{ {
if (*from == SS2 && len >= 2) if (*from == SS2 && len >= 2) /* JIS X 0201 (so called "1 byte KANA") */
{ {
from++; from++;
*to = 0xff & *from++; *to = (SS2 << 8) | *from++;
len -= 2; len -= 2;
} }
else if (*from == SS3 && len >= 3) else if (*from == SS3 && len >= 3) /* JIS X 0212 KANJI */
{ {
from++; from++;
*to = *from++ << 8; *to = (SS3 << 16) | (*from++ << 8);
*to |= 0x3f & *from++; *to |= *from++;
len -= 3; len -= 3;
} }
else if ((*from & 0x80) && len >= 2) else if ((*from & 0x80) && len >= 2) /* JIS X 0208 KANJI */
{ {
*to = *from++ << 8; *to = *from++ << 8;
*to |= *from++; *to |= *from++;
len -= 2; len -= 2;
} }
else else /* must be ASCII */
{ {
*to = *from++; *to = *from++;
len--; len--;
@ -183,6 +182,7 @@ pg_euckr_dsplen(const unsigned char *s)
/* /*
* EUC_CN * EUC_CN
*
*/ */
static int pg_euccn2wchar_with_len static int pg_euccn2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len) (const unsigned char *from, pg_wchar *to, int len)
@ -191,21 +191,21 @@ static int pg_euccn2wchar_with_len
while (len > 0 && *from) while (len > 0 && *from)
{ {
if (*from == SS2 && len >= 3) if (*from == SS2 && len >= 3) /* code set 2 (unused?) */
{ {
from++; from++;
*to = 0x3f00 & (*from++ << 8); *to = (SS2 << 16) | (*from++ << 8);
*to = *from++; *to |= *from++;
len -= 3; len -= 3;
} }
else if (*from == SS3 && len >= 3) else if (*from == SS3 && len >= 3) /* code set 3 (unsed ?) */
{ {
from++; from++;
*to = *from++ << 8; *to = (SS3 << 16) | (*from++ << 8);
*to |= 0x3f & *from++; *to |= *from++;
len -= 3; len -= 3;
} }
else if ((*from & 0x80) && len >= 2) else if ((*from & 0x80) && len >= 2) /* code set 1 */
{ {
*to = *from++ << 8; *to = *from++ << 8;
*to |= *from++; *to |= *from++;
@ -249,6 +249,7 @@ pg_euccn_dsplen(const unsigned char *s)
/* /*
* EUC_TW * EUC_TW
*
*/ */
static int pg_euctw2wchar_with_len static int pg_euctw2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len) (const unsigned char *from, pg_wchar *to, int len)
@ -257,22 +258,22 @@ static int pg_euctw2wchar_with_len
while (len > 0 && *from) while (len > 0 && *from)
{ {
if (*from == SS2 && len >= 4) if (*from == SS2 && len >= 4) /* code set 2 */
{ {
from++; from++;
*to = *from++ << 16; *to = (SS2 << 24) | (*from++ << 16) ;
*to |= *from++ << 8; *to |= *from++ << 8;
*to |= *from++; *to |= *from++;
len -= 4; len -= 4;
} }
else if (*from == SS3 && len >= 3) else if (*from == SS3 && len >= 3) /* code set 3 (unused?) */
{ {
from++; from++;
*to = *from++ << 8; *to = (SS3 << 16) | (*from++ << 8);
*to |= 0x3f & *from++; *to |= *from++;
len -= 3; len -= 3;
} }
else if ((*from & 0x80) && len >= 2) else if ((*from & 0x80) && len >= 2) /* code set 2 */
{ {
*to = *from++ << 8; *to = *from++ << 8;
*to |= *from++; *to |= *from++;