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Commit3c63578

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committed
Load and keep conversion function info when SET CLIENT_ENCODING TO is
executed to prevent database access while performing encodingconversion.
1 parentb53c851 commit3c63578

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1 file changed

+93
-14
lines changed

1 file changed

+93
-14
lines changed

‎src/backend/utils/mb/mbutils.c‎

Lines changed: 93 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -3,13 +3,14 @@
33
* client encoding and server internal encoding.
44
* (currently mule internal code (mic) is used)
55
* Tatsuo Ishii
6-
* $Id: mbutils.c,v 1.29 2002/07/25 10:07:12 ishii Exp $
6+
* $Id: mbutils.c,v 1.30 2002/08/08 06:35:26 ishii Exp $
77
*/
88
#include"postgres.h"
99
#include"access/xact.h"
1010
#include"miscadmin.h"
1111
#include"mb/pg_wchar.h"
1212
#include"utils/builtins.h"
13+
#include"utils/memutils.h"
1314
#include"utils/syscache.h"
1415
#include"catalog/namespace.h"
1516

@@ -22,13 +23,30 @@ static pg_enc2name *ClientEncoding = &pg_enc2name_tbl[PG_SQL_ASCII];
2223
staticpg_enc2name*DatabaseEncoding=&pg_enc2name_tbl[PG_SQL_ASCII];
2324

2425
/*
25-
* set the client encoding. if encoding conversion between
26-
* client/server encoding is not supported, returns -1
26+
* Caches for conversion function info. Note that Fcinfo.flinfo is
27+
* allocated in TopMemoryContext so that it survives outside
28+
* transactions. See SetClientEncoding() for more details.
2729
*/
30+
staticFmgrInfo*ToServerConvPorc=NULL;
31+
staticFmgrInfo*ToClientConvPorc=NULL;
32+
33+
/* Internal functions */
34+
staticunsignedchar*
35+
perform_default_encoding_conversion(unsignedchar*src,intlen,boolis_client_to_server);
36+
37+
/*
38+
* Set the client encoding and save fmgrinfo for the converion
39+
* function if necessary. if encoding conversion between client/server
40+
* encoding is not supported, returns -1
41+
*/
2842
int
2943
SetClientEncoding(intencoding,booldoit)
3044
{
3145
intcurrent_server_encoding;
46+
Oidto_server_proc,to_client_proc;
47+
FmgrInfo*to_server=NULL;
48+
FmgrInfo*to_client=NULL;
49+
MemoryContextoldcontext;
3250

3351
current_server_encoding=GetDatabaseEncoding();
3452

@@ -46,18 +64,35 @@ SetClientEncoding(int encoding, bool doit)
4664
* bootstrap or initprocessing mode since namespace functions will
4765
* not work.
4866
*/
49-
if (IsNormalProcessingMode())
67+
if (IsTransactionState())
5068
{
51-
if (!OidIsValid(FindDefaultConversionProc(encoding,current_server_encoding))||
52-
!OidIsValid(FindDefaultConversionProc(current_server_encoding,encoding)))
53-
return (-1);
69+
to_server_proc=FindDefaultConversionProc(encoding,current_server_encoding);
70+
to_client_proc=FindDefaultConversionProc(current_server_encoding,encoding);
71+
72+
if (!OidIsValid(to_server_proc)|| !OidIsValid(to_client_proc))
73+
return-1;
74+
75+
/*
76+
* load the fmgr info into TopMemoryContext so that it
77+
* survives outside transaction.
78+
*/
79+
oldcontext=MemoryContextSwitchTo(TopMemoryContext);
80+
to_server=palloc(sizeof(FmgrInfo));
81+
to_client=palloc(sizeof(FmgrInfo));
82+
fmgr_info(to_server_proc,to_server);
83+
fmgr_info(to_client_proc,to_client);
84+
MemoryContextSwitchTo(oldcontext);
5485
}
5586

5687
if (!doit)
5788
return0;
5889

59-
ClientEncoding=&pg_enc2name_tbl[encoding];
60-
90+
if (IsTransactionState())
91+
{
92+
ClientEncoding=&pg_enc2name_tbl[encoding];
93+
ToServerConvPorc=to_server;
94+
ToClientConvPorc=to_client;
95+
}
6196
return0;
6297
}
6398

@@ -95,7 +130,6 @@ pg_get_client_encoding_name(void)
95130
* (SJIS JIS X0201 half width kanna -> UTF-8 is the worst case).
96131
* So "4" should be enough for the moment.
97132
*/
98-
99133
unsignedchar*
100134
pg_do_encoding_conversion(unsignedchar*src,intlen,
101135
intsrc_encoding,intdest_encoding)
@@ -231,8 +265,7 @@ pg_client_to_server(unsigned char *s, int len)
231265
if (ClientEncoding->encoding==DatabaseEncoding->encoding)
232266
returns;
233267

234-
returnpg_do_encoding_conversion(s,len,ClientEncoding->encoding,
235-
DatabaseEncoding->encoding);
268+
returnperform_default_encoding_conversion(s,len, true);
236269
}
237270

238271
/*
@@ -247,8 +280,54 @@ pg_server_to_client(unsigned char *s, int len)
247280
if (ClientEncoding->encoding==DatabaseEncoding->encoding)
248281
returns;
249282

250-
returnpg_do_encoding_conversion(s,len,DatabaseEncoding->encoding,
251-
ClientEncoding->encoding);
283+
returnperform_default_encoding_conversion(s,len, false);
284+
}
285+
286+
/*
287+
* Perform default encoding conversion using cached FmgrInfo. Since
288+
* this function does not access database at all, it is safe to call
289+
* outside transactions. Explicit setting client encoding required
290+
* before calling this function. Otherwise no conversion is
291+
* performed.
292+
*/
293+
staticunsignedchar*
294+
perform_default_encoding_conversion(unsignedchar*src,intlen,boolis_client_to_server)
295+
{
296+
unsignedchar*result;
297+
intsrc_encoding,dest_encoding;
298+
FmgrInfo*flinfo;
299+
300+
if (is_client_to_server)
301+
{
302+
src_encoding=ClientEncoding->encoding;
303+
dest_encoding=DatabaseEncoding->encoding;
304+
flinfo=ToServerConvPorc;
305+
}
306+
else
307+
{
308+
src_encoding=DatabaseEncoding->encoding;
309+
dest_encoding=ClientEncoding->encoding;
310+
flinfo=ToClientConvPorc;
311+
}
312+
313+
if (flinfo==NULL)
314+
returnsrc;
315+
316+
if (src_encoding==dest_encoding)
317+
returnsrc;
318+
319+
if (src_encoding==PG_SQL_ASCII||dest_encoding==PG_SQL_ASCII)
320+
returnsrc;
321+
322+
result=palloc(len*4+1);
323+
324+
FunctionCall5(flinfo,
325+
Int32GetDatum(src_encoding),
326+
Int32GetDatum(dest_encoding),
327+
CStringGetDatum(src),
328+
CStringGetDatum(result),
329+
Int32GetDatum(len));
330+
returnresult;
252331
}
253332

254333
/* convert a multi-byte string to a wchar */

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