utf8_and_big5.c

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/*-------------------------------------------------------------------------
 *
 *    BIG5 <--> UTF8
 *
 * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *    src/backend/utils/mb/conversion_procs/utf8_and_big5/utf8_and_big5.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/big5_to_utf8.map"
#include "../../Unicode/utf8_to_big5.map"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(big5_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_big5);

/* ----------
 * 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.
 * ----------
 */
Datum
big5_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);
    bool        noError = PG_GETARG_BOOL(5);
    int         converted;

    CHECK_ENCODING_CONVERSION_ARGS(PG_BIG5, PG_UTF8);

    converted = LocalToUtf(src, len, dest,
                           &big5_to_unicode_tree,
                           NULL, 0,
                           NULL,
                           PG_BIG5,
                           noError);

    PG_RETURN_INT32(converted);
}

Datum
utf8_to_big5(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);
    bool        noError = PG_GETARG_BOOL(5);
    int         converted;

    CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_BIG5);

    converted = UtfToLocal(src, len, dest,
                           &big5_from_unicode_tree,
                           NULL, 0,
                           NULL,
                           PG_BIG5,
                           noError);

    PG_RETURN_INT32(converted);
}