utf8_and_win.c

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/*-------------------------------------------------------------------------
 *
 *    WIN <--> UTF8
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *    src/backend/utils/mb/conversion_procs/utf8_and_win/utf8_and_win.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/utf8_to_win1250.map"
#include "../../Unicode/utf8_to_win1251.map"
#include "../../Unicode/utf8_to_win1252.map"
#include "../../Unicode/utf8_to_win1253.map"
#include "../../Unicode/utf8_to_win1254.map"
#include "../../Unicode/utf8_to_win1255.map"
#include "../../Unicode/utf8_to_win1256.map"
#include "../../Unicode/utf8_to_win1257.map"
#include "../../Unicode/utf8_to_win1258.map"
#include "../../Unicode/utf8_to_win866.map"
#include "../../Unicode/utf8_to_win874.map"
#include "../../Unicode/win1250_to_utf8.map"
#include "../../Unicode/win1251_to_utf8.map"
#include "../../Unicode/win1252_to_utf8.map"
#include "../../Unicode/win1253_to_utf8.map"
#include "../../Unicode/win1254_to_utf8.map"
#include "../../Unicode/win1255_to_utf8.map"
#include "../../Unicode/win1256_to_utf8.map"
#include "../../Unicode/win1257_to_utf8.map"
#include "../../Unicode/win866_to_utf8.map"
#include "../../Unicode/win874_to_utf8.map"
#include "../../Unicode/win1258_to_utf8.map"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(win_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_win);

extern Datum win_to_utf8(PG_FUNCTION_ARGS);
extern Datum utf8_to_win(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;
 * ----------
 */

typedef struct
{
    pg_enc      encoding;
    pg_local_to_utf *map1;      /* to UTF8 map name */
    pg_utf_to_local *map2;      /* from UTF8 map name */
    int         size1;          /* size of map1 */
    int         size2;          /* size of map2 */
} pg_conv_map;

static pg_conv_map maps[] = {
    {PG_WIN866, LUmapWIN866, ULmapWIN866,
        sizeof(LUmapWIN866) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN866) / sizeof(pg_utf_to_local)},
    {PG_WIN874, LUmapWIN874, ULmapWIN874,
        sizeof(LUmapWIN874) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN874) / sizeof(pg_utf_to_local)},
    {PG_WIN1250, LUmapWIN1250, ULmapWIN1250,
        sizeof(LUmapWIN1250) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1250) / sizeof(pg_utf_to_local)},
    {PG_WIN1251, LUmapWIN1251, ULmapWIN1251,
        sizeof(LUmapWIN1251) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1251) / sizeof(pg_utf_to_local)},
    {PG_WIN1252, LUmapWIN1252, ULmapWIN1252,
        sizeof(LUmapWIN1252) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1252) / sizeof(pg_utf_to_local)},
    {PG_WIN1253, LUmapWIN1253, ULmapWIN1253,
        sizeof(LUmapWIN1253) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1253) / sizeof(pg_utf_to_local)},
    {PG_WIN1254, LUmapWIN1254, ULmapWIN1254,
        sizeof(LUmapWIN1254) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1254) / sizeof(pg_utf_to_local)},
    {PG_WIN1255, LUmapWIN1255, ULmapWIN1255,
        sizeof(LUmapWIN1255) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1255) / sizeof(pg_utf_to_local)},
    {PG_WIN1256, LUmapWIN1256, ULmapWIN1256,
        sizeof(LUmapWIN1256) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1256) / sizeof(pg_utf_to_local)},
    {PG_WIN1257, LUmapWIN1257, ULmapWIN1257,
        sizeof(LUmapWIN1257) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1257) / sizeof(pg_utf_to_local)},
    {PG_WIN1258, LUmapWIN1258, ULmapWIN1258,
        sizeof(LUmapWIN1258) / sizeof(pg_local_to_utf),
    sizeof(ULmapWIN1258) / sizeof(pg_utf_to_local)},
};

Datum
win_to_utf8(PG_FUNCTION_ARGS)
{
    int         encoding = PG_GETARG_INT32(0);
    unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
    unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
    int         len = PG_GETARG_INT32(4);
    int         i;

    CHECK_ENCODING_CONVERSION_ARGS(-1, PG_UTF8);

    for (i = 0; i < sizeof(maps) / sizeof(pg_conv_map); i++)
    {
        if (encoding == maps[i].encoding)
        {
            LocalToUtf(src, dest, maps[i].map1, NULL, maps[i].size1, 0, encoding, len);
            PG_RETURN_VOID();
        }
    }

    ereport(ERROR,
            (errcode(ERRCODE_INTERNAL_ERROR),
      errmsg("unexpected encoding ID %d for WIN character sets", encoding)));

    PG_RETURN_VOID();
}

Datum
utf8_to_win(PG_FUNCTION_ARGS)
{
    int         encoding = PG_GETARG_INT32(1);
    unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
    unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
    int         len = PG_GETARG_INT32(4);
    int         i;

    CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, -1);

    for (i = 0; i < sizeof(maps) / sizeof(pg_conv_map); i++)
    {
        if (encoding == maps[i].encoding)
        {
            UtfToLocal(src, dest, maps[i].map2, NULL, maps[i].size2, 0, encoding, len);
            PG_RETURN_VOID();
        }
    }

    ereport(ERROR,
            (errcode(ERRCODE_INTERNAL_ERROR),
      errmsg("unexpected encoding ID %d for WIN character sets", encoding)));

    PG_RETURN_VOID();
}