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euc_kr_and_mic.c

/*-------------------------------------------------------------------------
 *
 *      EUC_KR and MULE_INTERNAL
 *
 * 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/euc_kr_and_mic/euc_kr_and_mic.c,v 1.19 2009/01/29 19:23:39 tgl Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(euc_kr_to_mic);
PG_FUNCTION_INFO_V1(mic_to_euc_kr);

extern Datum euc_kr_to_mic(PG_FUNCTION_ARGS);
extern Datum mic_to_euc_kr(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;
 * ----------
 */

static void euc_kr2mic(const unsigned char *euc, unsigned char *p, int len);
static void mic2euc_kr(const unsigned char *mic, unsigned char *p, int len);

Datum
euc_kr_to_mic(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_EUC_KR, PG_MULE_INTERNAL);

      euc_kr2mic(src, dest, len);

      PG_RETURN_VOID();
}

Datum
mic_to_euc_kr(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_MULE_INTERNAL, PG_EUC_KR);

      mic2euc_kr(src, dest, len);

      PG_RETURN_VOID();
}

/*
 * EUC_KR ---> MIC
 */
static void
euc_kr2mic(const unsigned char *euc, unsigned char *p, int len)
{
      int               c1;
      int               l;

      while (len > 0)
      {
            c1 = *euc;
            if (IS_HIGHBIT_SET(c1))
            {
                  l = pg_encoding_verifymb(PG_EUC_KR, (const char *) euc, len);
                  if (l != 2)
                        report_invalid_encoding(PG_EUC_KR,
                                                            (const char *) euc, len);
                  *p++ = LC_KS5601;
                  *p++ = c1;
                  *p++ = euc[1];
                  euc += 2;
                  len -= 2;
            }
            else
            {                                   /* should be ASCII */
                  if (c1 == 0)
                        report_invalid_encoding(PG_EUC_KR,
                                                            (const char *) euc, len);
                  *p++ = c1;
                  euc++;
                  len--;
            }
      }
      *p = '\0';
}

/*
 * MIC ---> EUC_KR
 */
static void
mic2euc_kr(const unsigned char *mic, unsigned char *p, int len)
{
      int               c1;
      int               l;

      while (len > 0)
      {
            c1 = *mic;
            if (!IS_HIGHBIT_SET(c1))
            {
                  /* ASCII */
                  if (c1 == 0)
                        report_invalid_encoding(PG_MULE_INTERNAL,
                                                            (const char *) mic, len);
                  *p++ = c1;
                  mic++;
                  len--;
                  continue;
            }
            l = pg_encoding_verifymb(PG_MULE_INTERNAL, (const char *) mic, len);
            if (l < 0)
                  report_invalid_encoding(PG_MULE_INTERNAL,
                                                      (const char *) mic, len);
            if (c1 == LC_KS5601)
            {
                  *p++ = mic[1];
                  *p++ = mic[2];
            }
            else
                  report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_KR,
                                                         (const char *) mic, len);
            mic += l;
            len -= l;
      }
      *p = '\0';
}

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