/*
 * conversion between client encoding and server internal encoding
 * (currently mule internal code (mic) is used)
 * Tatsuo Ishii
 * $Id: conv.c,v 1.3 1998/09/01 04:33:21 momjian Exp $
 */
#include <stdio.h>
#include <string.h>

#include "mb/pg_wchar.h"

/*
 * convert bogus chars that cannot be represented in the current encoding
 * system.
 */
static void
printBogusChar(unsigned char **mic, unsigned char **p)
{
	char		strbuf[16];
	int			l = pg_mic_mblen(*mic);

	*(*p)++ = '(';
	while (l--)
	{
		sprintf(strbuf, "%02x", *(*mic)++);
		*(*p)++ = strbuf[0];
		*(*p)++ = strbuf[1];
	}
	*(*p)++ = ')';
}

/*
 * SJIS ---> MIC
 */
static void
sjis2mic(unsigned char *sjis, unsigned char *p, int len)
{
	int			c1,
				c2;

	while (len > 0 && (c1 = *sjis++))
	{
		if (c1 >= 0xa1 && c1 <= 0xdf)
		{						/* 1 byte kana? */
			len--;
			*p++ = LC_JISX0201K;
			*p++ = c1;
		}
		else if (c1 > 0x7f)
		{						/* kanji? */
			c2 = *sjis++;
			len -= 2;
			*p++ = LC_JISX0208;
			*p++ = ((c1 & 0x3f) << 1) + 0x9f + (c2 > 0x9e);
			*p++ = c2 + ((c2 > 0x9e) ? 2 : 0x60) + (c2 < 0x80);
		}
		else
		{						/* should be ASCII */
			len--;
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * MIC ---> SJIS
 */
static void
mic2sjis(unsigned char *mic, unsigned char *p, int len)
{
	int			c1,
				c2;

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == LC_JISX0201K)
			*p++ = *mic++;
		else if (c1 == LC_JISX0208)
		{
			c1 = *mic++;
			c2 = *mic++;
			*p++ = ((c1 - 0xa1) >> 1) + ((c1 < 0xdf) ? 0x81 : 0xc1);
			*p++ = c2 - ((c1 & 1) ? ((c2 < 0xe0) ? 0x61 : 0x60) : 2);
		}
		else if (c1 > 0x7f)
		{						/* cannot convert to SJIS! */
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * EUC_JP ---> MIC
 */
static void
euc_jp2mic(unsigned char *euc, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *euc++))
	{
		if (c1 == SS2)
		{						/* 1 byte kana? */
			len -= 2;
			*p++ = LC_JISX0201K;
			*p++ = *euc++;
		}
		else if (c1 == SS3)
		{						/* JIS X0212 kanji? */
			len -= 3;
			*p++ = LC_JISX0212;
			*p++ = *euc++;
			*p++ = *euc++;
		}
		else if (c1 & 0x80)
		{						/* kanji? */
			len -= 2;
			*p++ = LC_JISX0208;
			*p++ = c1;
			*p++ = *euc++;
		}
		else
		{						/* should be ASCII */
			len--;
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * MIC ---> EUC_JP
 */
static void
mic2euc_jp(unsigned char *mic, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == LC_JISX0201K)
		{
			*p++ = SS2;
			*p++ = *mic++;
		}
		else if (c1 == LC_JISX0212)
		{
			*p++ = SS3;
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 == LC_JISX0208)
		{
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 > 0x7f)
		{						/* cannot convert to EUC_JP! */
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

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

	while (len > 0 && (c1 = *euc++))
	{
		if (c1 & 0x80)
		{
			len -= 2;
			*p++ = LC_KS5601;
			*p++ = c1;
			*p++ = *euc++;
		}
		else
		{						/* should be ASCII */
			len--;
			*p++ = c1;
		}
	}
	*p = '\0';
}

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

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == LC_KS5601)
		{
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 > 0x7f)
		{						/* cannot convert to EUC_KR! */
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * EUC_CN ---> MIC
 */
static void
euc_cn2mic(unsigned char *euc, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *euc++))
	{
		if (c1 & 0x80)
		{
			len -= 2;
			*p++ = LC_GB2312_80;
			*p++ = c1;
			*p++ = *euc++;
		}
		else
		{						/* should be ASCII */
			len--;
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * MIC ---> EUC_CN
 */
static void
mic2euc_cn(unsigned char *mic, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == LC_GB2312_80)
		{
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 > 0x7f)
		{						/* cannot convert to EUC_CN! */
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * EUC_TW ---> MIC
 */
static void
euc_tw2mic(unsigned char *euc, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *euc++))
	{
		if (c1 == SS2)
		{
			len -= 4;
			c1 = *euc++;		/* plane No. */
			if (c1 == 0xa1)
				*p++ = LC_CNS11643_1;
			else if (c1 == 0xa2)
				*p++ = LC_CNS11643_2;
			else
			{
				*p++ = 0x9d;	/* LCPRV2 */
				*p++ = 0xa3 - c1 + LC_CNS11643_3;
			}
			*p++ = *euc++;
			*p++ = *euc++;
		}
		else if (c1 & 0x80)
		{						/* CNS11643-1 */
			len -= 2;
			*p++ = LC_CNS11643_1;
			*p++ = c1;
			*p++ = *euc++;
		}
		else
		{						/* should be ASCII */
			len--;
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * MIC ---> EUC_TW
 */
static void
mic2euc_tw(unsigned char *mic, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == LC_CNS11643_1 || c1 == LC_CNS11643_2)
		{
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 == 0x9d)
		{						/* LCPRV2? */
			*p++ = SS2;
			*p++ = c1 - LC_CNS11643_3 + 0xa3;
			*p++ = *mic++;
			*p++ = *mic++;
		}
		else if (c1 > 0x7f)
		{						/* cannot convert to EUC_TW! */
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

/*
 * LATINn ---> MIC
 */
static void
latin2mic(unsigned char *l, unsigned char *p, int len, int lc)
{
	int			c1;

	while (len-- > 0 && (c1 = *l++))
	{
		if (c1 > 0x7f)
		{						/* Latin1? */
			*p++ = lc;
		}
		*p++ = c1;
	}
	*p = '\0';
}

/*
 * MIC ---> LATINn
 */
static void
mic2latin(unsigned char *mic, unsigned char *p, int len, int lc)
{
	int			c1;

	while (len > 0 && (c1 = *mic))
	{
		len -= pg_mic_mblen(mic++);

		if (c1 == lc)
			*p++ = *mic++;
		else if (c1 > 0x7f)
		{
			mic--;
			printBogusChar(&mic, &p);
		}
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

static void
latin12mic(unsigned char *l, unsigned char *p, int len)
{
	latin2mic(l, p, len, LC_ISO8859_1);
}
static void
mic2latin1(unsigned char *mic, unsigned char *p, int len)
{
	mic2latin(mic, p, len, LC_ISO8859_1);
}
static void
latin22mic(unsigned char *l, unsigned char *p, int len)
{
	latin2mic(l, p, len, LC_ISO8859_2);
}
static void
mic2latin2(unsigned char *mic, unsigned char *p, int len)
{
	mic2latin(mic, p, len, LC_ISO8859_2);
}
static void
latin32mic(unsigned char *l, unsigned char *p, int len)
{
	latin2mic(l, p, len, LC_ISO8859_3);
}
static void
mic2latin3(unsigned char *mic, unsigned char *p, int len)
{
	mic2latin(mic, p, len, LC_ISO8859_3);
}
static void
latin42mic(unsigned char *l, unsigned char *p, int len)
{
	latin2mic(l, p, len, LC_ISO8859_4);
}
static void
mic2latin4(unsigned char *mic, unsigned char *p, int len)
{
	mic2latin(mic, p, len, LC_ISO8859_4);
}
static void
latin52mic(unsigned char *l, unsigned char *p, int len)
{
	latin2mic(l, p, len, LC_ISO8859_5);
}
static void
mic2latin5(unsigned char *mic, unsigned char *p, int len)
{
	mic2latin(mic, p, len, LC_ISO8859_5);
}

/*
 * ASCII ---> MIC
 */
static void
ascii2mic(unsigned char *l, unsigned char *p, int len)
{
	int			c1;

	while (len-- > 0 && (c1 = *l++))
		*p++ = (c1 & 0x7f);
	*p = '\0';
}

/*
 * MIC ---> ASCII
 */
static void
mic2ascii(unsigned char *mic, unsigned char *p, int len)
{
	int			c1;

	while (len > 0 && (c1 = *mic))
	{
		if (c1 > 0x7f)
			printBogusChar(&mic, &p);
		else
		{						/* should be ASCII */
			*p++ = c1;
		}
	}
	*p = '\0';
}

pg_encoding_conv_tbl pg_conv_tbl[] = {
	{SQL_ASCII, "SQL_ASCII", 0, ascii2mic, mic2ascii},	/* SQL/ACII */
	{EUC_JP, "EUC_JP", 0, euc_jp2mic, mic2euc_jp},		/* EUC_JP */
	{EUC_CN, "EUC_CN", 0, euc_cn2mic, mic2euc_cn},		/* EUC_CN */
	{EUC_KR, "EUC_KR", 0, euc_kr2mic, mic2euc_kr},		/* EUC_KR */
	{EUC_TW, "EUC_TW", 0, euc_tw2mic, mic2euc_tw},		/* EUC_TW */
	{UNICODE, "UNICODE", 0, 0, 0},		/* UNICODE */
	{MULE_INTERNAL, "MULE_INTERNAL", 0, 0, 0},	/* MULE_INTERNAL */
	{LATIN1, "LATIN1", 0, latin12mic, mic2latin1},		/* ISO 8859 Latin 1 */
	{LATIN2, "LATIN2", 0, latin22mic, mic2latin2},		/* ISO 8859 Latin 2 */
	{LATIN3, "LATIN3", 0, latin32mic, mic2latin3},		/* ISO 8859 Latin 3 */
	{LATIN4, "LATIN4", 0, latin42mic, mic2latin4},		/* ISO 8859 Latin 4 */
	{LATIN5, "LATIN5", 0, latin52mic, mic2latin5},		/* ISO 8859 Latin 5 */
	{SJIS, "SJIS", 1, sjis2mic, mic2sjis},		/* SJIS */
	{-1, "", 0, 0, 0}			/* end mark */
};
