utf8_and_win.c

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/*-------------------------------------------------------------------------
 *
 *    WIN <--> UTF8
 *
 * Portions Copyright (c) 1996-2025, 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_EXT(
                    .name = "utf8_and_win",
                    .version = PG_VERSION
);
 
PG_FUNCTION_INFO_V1(win_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_win);
 
/* ----------
 * 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
 *      BOOL        -- if true, don't throw an error if conversion fails
 * ) returns INTEGER;
 *
 * Returns the number of bytes successfully converted.
 * ----------
 */
 
typedef struct
{
    pg_enc      encoding;
    const pg_mb_radix_tree *map1;   /* to UTF8 map name */
    const pg_mb_radix_tree *map2;   /* from UTF8 map name */
} pg_conv_map;
 
static const pg_conv_map maps[] = {
    {PG_WIN866, &win866_to_unicode_tree, &win866_from_unicode_tree},
    {PG_WIN874, &win874_to_unicode_tree, &win874_from_unicode_tree},
    {PG_WIN1250, &win1250_to_unicode_tree, &win1250_from_unicode_tree},
    {PG_WIN1251, &win1251_to_unicode_tree, &win1251_from_unicode_tree},
    {PG_WIN1252, &win1252_to_unicode_tree, &win1252_from_unicode_tree},
    {PG_WIN1253, &win1253_to_unicode_tree, &win1253_from_unicode_tree},
    {PG_WIN1254, &win1254_to_unicode_tree, &win1254_from_unicode_tree},
    {PG_WIN1255, &win1255_to_unicode_tree, &win1255_from_unicode_tree},
    {PG_WIN1256, &win1256_to_unicode_tree, &win1256_from_unicode_tree},
    {PG_WIN1257, &win1257_to_unicode_tree, &win1257_from_unicode_tree},
    {PG_WIN1258, &win1258_to_unicode_tree, &win1258_from_unicode_tree},
};
 
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);
    bool        noError = PG_GETARG_BOOL(5);
    int         i;
 
    CHECK_ENCODING_CONVERSION_ARGS(-1, PG_UTF8);
 
    for (i = 0; i < lengthof(maps); i++)
    {
        if (encoding == maps[i].encoding)
        {
            int         converted;
 
            converted = LocalToUtf(src, len, dest,
                                   maps[i].map1,
                                   NULL, 0,
                                   NULL,
                                   encoding,
                                   noError);
            PG_RETURN_INT32(converted);
        }
    }
 
    ereport(ERROR,
            (errcode(ERRCODE_INTERNAL_ERROR),
             errmsg("unexpected encoding ID %d for WIN character sets",
                    encoding)));
 
    PG_RETURN_INT32(0);
}
 
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);
    bool        noError = PG_GETARG_BOOL(5);
    int         i;
 
    CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, -1);
 
    for (i = 0; i < lengthof(maps); i++)
    {
        if (encoding == maps[i].encoding)
        {
            int         converted;
 
            converted = UtfToLocal(src, len, dest,
                                   maps[i].map2,
                                   NULL, 0,
                                   NULL,
                                   encoding,
                                   noError);
            PG_RETURN_INT32(converted);
        }
    }
 
    ereport(ERROR,
            (errcode(ERRCODE_INTERNAL_ERROR),
             errmsg("unexpected encoding ID %d for WIN character sets",
                    encoding)));
 
    PG_RETURN_INT32(0);
}