/*-------------------------------------------------------------------------
 *
 *	  ISO 8859 2-16 <--> UTF-8
 *
 * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *	  $Header: /cvsroot/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859/utf8_and_iso8859.c,v 1.1 2002/07/16 09:25:05 ishii Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/utf8_to_iso8859_2.map"
#include "../../Unicode/utf8_to_iso8859_3.map"
#include "../../Unicode/utf8_to_iso8859_4.map"
#include "../../Unicode/utf8_to_iso8859_5.map"
#include "../../Unicode/utf8_to_iso8859_6.map"
#include "../../Unicode/utf8_to_iso8859_7.map"
#include "../../Unicode/utf8_to_iso8859_8.map"
#include "../../Unicode/utf8_to_iso8859_9.map"
#include "../../Unicode/utf8_to_iso8859_10.map"
#include "../../Unicode/utf8_to_iso8859_13.map"
#include "../../Unicode/utf8_to_iso8859_14.map"
#include "../../Unicode/utf8_to_iso8859_15.map"
#include "../../Unicode/utf8_to_iso8859_16.map"
#include "../../Unicode/iso8859_2_to_utf8.map"
#include "../../Unicode/iso8859_3_to_utf8.map"
#include "../../Unicode/iso8859_4_to_utf8.map"
#include "../../Unicode/iso8859_5_to_utf8.map"
#include "../../Unicode/iso8859_6_to_utf8.map"
#include "../../Unicode/iso8859_7_to_utf8.map"
#include "../../Unicode/iso8859_8_to_utf8.map"
#include "../../Unicode/iso8859_9_to_utf8.map"
#include "../../Unicode/iso8859_10_to_utf8.map"
#include "../../Unicode/iso8859_13_to_utf8.map"
#include "../../Unicode/iso8859_14_to_utf8.map"
#include "../../Unicode/iso8859_15_to_utf8.map"
#include "../../Unicode/iso8859_16_to_utf8.map"

PG_FUNCTION_INFO_V1(iso8859_to_utf8)
PG_FUNCTION_INFO_V1(utf8_to_iso8859)

extern Datum iso8859_to_utf8(PG_FUNCTION_ARGS);
extern Datum utf8_to_iso8859(PG_FUNCTION_ARGS);

/* ----------
 * conv_proc(
 *		INTEGER,	-- source encoding id
 *		INTEGER,	-- destination encoding id
 *		OPAQUE,		-- source string (null terminated C string)
 *		OPAQUE,		-- destination string (null terminated C string)
 *		INTEGER		-- source string length
 * ) returns INTEGER;	-- dummy. returns nothing, actually.
 * ----------
 */

typedef struct {
	pg_enc encoding;
	pg_local_to_utf	*map1;		/* to UTF-8 map name */
	pg_utf_to_local	*map2;		/* from UTF-8 map name */
	int	size1;	/* size of map1 */
	int	size2;	/* size of map2 */
} pg_conv_map;

static pg_conv_map maps[] = {
	{PG_SQL_ASCII},			/* SQL/ASCII */
	{PG_EUC_JP},			/* EUC for Japanese */
	{PG_EUC_CN},			/* EUC for Chinese */
	{PG_EUC_KR},			/* EUC for Korean */
	{PG_EUC_TW},			/* EUC for Taiwan */
	{PG_JOHAB},				/* EUC for Korean JOHAB */
	{PG_UTF8},				/* Unicode UTF-8 */
	{PG_MULE_INTERNAL},		/* Mule internal code */
	{PG_LATIN1},			/* ISO-8859-1 Latin 1 */
	{PG_LATIN2, LUmapISO8859_2, ULmapISO8859_2,
	 sizeof(LUmapISO8859_2)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_2)/sizeof(pg_utf_to_local)},	/* ISO-8859-2 Latin 2 */
	{PG_LATIN3, LUmapISO8859_3, ULmapISO8859_3,
	 sizeof(LUmapISO8859_3)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_3)/sizeof(pg_utf_to_local)},	/* ISO-8859-3 Latin 3 */
	{PG_LATIN4, LUmapISO8859_4, ULmapISO8859_4,
	 sizeof(LUmapISO8859_4)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_4)/sizeof(pg_utf_to_local)},	/* ISO-8859-4 Latin 4 */
	{PG_LATIN5, LUmapISO8859_9, ULmapISO8859_9,
	 sizeof(LUmapISO8859_9)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_9)/sizeof(pg_utf_to_local)},	/* ISO-8859-9 Latin 5 */
	{PG_LATIN6, LUmapISO8859_10, ULmapISO8859_10,
	 sizeof(LUmapISO8859_10)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_10)/sizeof(pg_utf_to_local)},	/* ISO-8859-10 Latin 6 */
	{PG_LATIN7, LUmapISO8859_13, ULmapISO8859_13,
	 sizeof(LUmapISO8859_13)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_13)/sizeof(pg_utf_to_local)},	/* ISO-8859-13 Latin 7 */
	{PG_LATIN8, LUmapISO8859_14, ULmapISO8859_14,
	 sizeof(LUmapISO8859_14)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_14)/sizeof(pg_utf_to_local)},	/* ISO-8859-14 Latin 8 */
	{PG_LATIN9, LUmapISO8859_2, ULmapISO8859_2,
	 sizeof(LUmapISO8859_15)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_15)/sizeof(pg_utf_to_local)},	/* ISO-8859-15 Latin 9 */
	{PG_LATIN10, LUmapISO8859_16, ULmapISO8859_16,
	 sizeof(LUmapISO8859_16)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_16)/sizeof(pg_utf_to_local)},	/* ISO-8859-16 Latin 10 */
	{PG_WIN1256},					/* windows-1256 */
	{PG_TCVN},					/* TCVN (Windows-1258) */
	{PG_WIN874},				/* windows-874 */
	{PG_KOI8R},					/* KOI8-R */
	{PG_WIN1251},				/* windows-1251 (was: WIN) */
	{PG_ALT},					/* (MS-DOS CP866) */
	{PG_ISO_8859_5, LUmapISO8859_5, ULmapISO8859_5,
	 sizeof(LUmapISO8859_5)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_5)/sizeof(pg_utf_to_local)},	/* ISO-8859-5 */
	{PG_ISO_8859_6, LUmapISO8859_6, ULmapISO8859_6,
	 sizeof(LUmapISO8859_6)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_6)/sizeof(pg_utf_to_local)},	/* ISO-8859-6 */
	{PG_ISO_8859_7, LUmapISO8859_7, ULmapISO8859_7,
	 sizeof(LUmapISO8859_7)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_7)/sizeof(pg_utf_to_local)},	/* ISO-8859-7 */
	{PG_ISO_8859_8, LUmapISO8859_8, ULmapISO8859_8,
	 sizeof(LUmapISO8859_8)/sizeof(pg_local_to_utf),
	 sizeof(ULmapISO8859_8)/sizeof(pg_utf_to_local)},	/* ISO-8859-8 */
};
		
Datum
iso8859_to_utf8(PG_FUNCTION_ARGS)
{
	int encoding = PG_GETARG_INT32(0);
	unsigned char *src = PG_GETARG_CSTRING(2);
	unsigned char *dest = PG_GETARG_CSTRING(3);
	int len = PG_GETARG_INT32(4);

	Assert(PG_GETARG_INT32(1) == PG_UTF8);
	Assert(len > 0);

	LocalToUtf(src, dest, maps[encoding].map1, maps[encoding].size1, encoding, len);

	PG_RETURN_INT32(0);
}

Datum
utf8_to_iso8859(PG_FUNCTION_ARGS)
{
	int encoding = PG_GETARG_INT32(1);
	unsigned char *src = PG_GETARG_CSTRING(2);
	unsigned char *dest = PG_GETARG_CSTRING(3);
	int len = PG_GETARG_INT32(4);

	Assert(PG_GETARG_INT32(0) == PG_UTF8);
	Assert(len > 0);

	UtfToLocal(src, dest, maps[encoding].map2, maps[encoding].size2, len);

	PG_RETURN_INT32(0);
}
