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utf8_and_gb18030.c

/*-------------------------------------------------------------------------
 *
 *      GB18030 <--> UTF8
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *      $PostgreSQL: pgsql/src/backend/utils/mb/conversion_procs/utf8_and_gb18030/utf8_and_gb18030.c,v 1.22 2009/01/29 19:23:40 tgl Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/gb18030_to_utf8.map"
#include "../../Unicode/utf8_to_gb18030.map"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(gb18030_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_gb18030);

extern Datum gb18030_to_utf8(PG_FUNCTION_ARGS);
extern Datum utf8_to_gb18030(PG_FUNCTION_ARGS);

/* ----------
 * conv_proc(
 *          INTEGER,    -- source encoding id
 *          INTEGER,    -- destination encoding id
 *          CSTRING,    -- source string (null terminated C string)
 *          CSTRING,    -- destination string (null terminated C string)
 *          INTEGER           -- source string length
 * ) returns VOID;
 * ----------
 */
Datum
gb18030_to_utf8(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_GB18030, PG_UTF8);

      LocalToUtf(src, dest, LUmapGB18030, NULL,
             sizeof(LUmapGB18030) / sizeof(pg_local_to_utf), 0, PG_GB18030, len);

      PG_RETURN_VOID();
}

Datum
utf8_to_gb18030(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_GB18030);

      UtfToLocal(src, dest, ULmapGB18030, NULL,
             sizeof(ULmapGB18030) / sizeof(pg_utf_to_local), 0, PG_GB18030, len);

      PG_RETURN_VOID();
}

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