/****************************************************************
 *								*
 *	Copyright 2001, 2012 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"
#include "arit.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "collseq.h"
#include "gdsfhead.h"
#include "rc_iscan.h"
#include "do_xform.h"
#include "format_targ_key.h"

GBLREF gv_namehead	*gv_target;
GBLREF gd_region       *gv_cur_region;

error_def(ERR_GVSUBOFLOW);
error_def(ERR_NUMOFLOW);
error_def(ERR_GVIS);

static readonly unsigned char pos_code[100] =
{
	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
	0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a,
	0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
	0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
	0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
	0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
	0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
	0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
	0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a,
	0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a
};

static readonly unsigned char neg_code[100] =
{
	0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7, 0xf6, 0xf5,
	0xee, 0xed, 0xec, 0xeb, 0xea, 0xe9, 0xe8, 0xe7, 0xe6, 0xe5,
	0xde, 0xdd, 0xdc, 0xdb, 0xda, 0xd9, 0xd8, 0xd7, 0xd6, 0xd5,
	0xce, 0xcd, 0xcc, 0xcb, 0xca, 0xc9, 0xc8, 0xc7, 0xc6, 0xc5,
	0xbe, 0xbd, 0xbc, 0xbb, 0xba, 0xb9, 0xb8, 0xb7, 0xb6, 0xb5,
	0xae, 0xad, 0xac, 0xab, 0xaa, 0xa9, 0xa8, 0xa7, 0xa6, 0xa5,
	0x9e, 0x9d, 0x9c, 0x9b, 0x9a, 0x99, 0x98, 0x97, 0x96, 0x95,
	0x8e, 0x8d, 0x8c, 0x8b, 0x8a, 0x89, 0x88, 0x87, 0x86, 0x85,
	0x7e, 0x7d, 0x7c, 0x7b, 0x7a, 0x79, 0x78, 0x77, 0x76, 0x75,
	0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x69, 0x68, 0x67, 0x66, 0x65
};

unsigned char *mval2subsc(mval *v, gv_key *g)
{
        char            buf1[MAX_KEY_SZ + 1];
	mstr		mstr_buf1;
	mstr		mstr_ch;
	int	exp_val;
	bool	is_negative;
	unsigned char	buff[MAX_ZWR_KEY_SZ], *end;
	int4 	n, m, mx, digs;
	unsigned char *cvt_table;
	uint4 mvt;	/* Local copy of mvtype, bit ands use a int4, so do conversion once */
	unsigned char *out_ptr;
	unsigned char *in_ptr, ch;
	unsigned char temp_mantissa[NUM_DEC_DG_2L / 2 + 3];	/* Need 1 byte for each two digits.  Add 3 bytes slop */
	unsigned char *tm;
	DCL_THREADGBL_ACCESS;

	SETUP_THREADGBL_ACCESS;
	out_ptr = g->base + g->end;
	MV_FORCE_STR(v);
	if (TREF(transform) && gv_target->nct)
		mvt = v->mvtype | MV_NUM_APPROX;
	else
	{
		mvt = (uint4)v->mvtype;
		/* this code differs from mval2subsc in port
		 * due to possilbe precision differences in the client representations
		 */
		if (rc_iscan(v))
		{
			/* Yes, convert it to numeric */
			s2n(v);
			mvt = v->mvtype;
			if (!(mvt & MV_NM))
				rts_error(VARLSTCNT(1) ERR_NUMOFLOW);
		}
		else
		{
			/* No, not numeric.  Note the fact for future reference */
			mvt = v->mvtype |= MV_NUM_APPROX;
		}
	}
	if (mvt & MV_NUM_APPROX)
	{	/* It's a string */
		in_ptr = (unsigned char *) v->str.addr;
		n = v->str.len;
		if (TREF(transform) && gv_target->collseq)
		{
			mstr_ch.len = n;
			mstr_ch.addr = (char*) in_ptr;
			mstr_buf1.len = SIZEOF(buf1);
			mstr_buf1.addr = buf1;
			do_xform(gv_target->collseq, XFORM, &mstr_ch, &mstr_buf1, (int *)&n);
			in_ptr = (unsigned char *)mstr_buf1.addr; /* mstr_buf1.addr is used just in case it is
								     reallocated by the XFORM routine */
                }
		if ((g->end + n + 3) > (g->top - MAX_GVKEY_PADDING_LEN))
		{
			if (0 == (end = format_targ_key(buff, MAX_ZWR_KEY_SZ, g, TRUE)))
				end = &buff[MAX_ZWR_KEY_SZ - 1];
			rts_error(VARLSTCNT(6) ERR_GVSUBOFLOW, 0, ERR_GVIS, 2, end - buff, buff);
		}
		if (n > 0)
		{
			*out_ptr++ = STR_SUB_PREFIX;
			do
			{
				ch = *in_ptr++;
				if (ch <= 1)
				{
					*out_ptr++ = STR_SUB_ESCAPE;
					if ( out_ptr - g->base + n + 3 > g->top - MAX_GVKEY_PADDING_LEN)
					{
						if ((end = format_targ_key(buff, MAX_ZWR_KEY_SZ, g, TRUE)) == 0)
						{
							end = &buff[MAX_ZWR_KEY_SZ - 1];
						}
						rts_error(VARLSTCNT(6) ERR_GVSUBOFLOW, 0, ERR_GVIS, 2, end - buff, buff);
					}
					ch++;	/* promote character */
				}
				*out_ptr++ = ch;
			} while (--n > 0);
		} else
		{
			*out_ptr++ = (!TREF(transform) || 0 == gv_cur_region->std_null_coll)
				? STR_SUB_PREFIX : SUBSCRIPT_STDCOL_NULL;
		}
		goto FINI;
	}
	/* Its a number, is it an integer? */
	if ( mvt & MV_INT )
	{	/* Yes, its an integer, convert it */
		is_negative = FALSE;
		cvt_table = pos_code;
		if ((m = v->m[1]) < 0)
		{
			is_negative = TRUE;
			cvt_table = neg_code;
			m = -m;
		} else if (0 == m)
		{
			*out_ptr++ = 0x80;
			goto FINI;
		}
		if (10 > m)
		{
			*out_ptr++ = is_negative ? ~(SUBSCRIPT_BIAS - 2): (SUBSCRIPT_BIAS - 2);
			*out_ptr++ = cvt_table[m * 10];
			goto FINISH_NUMBER;
		}
		if (100 > m)
		{
			*out_ptr++ = is_negative ? ~(SUBSCRIPT_BIAS - 1): (SUBSCRIPT_BIAS - 1);
			*out_ptr++ = cvt_table[m];
			goto FINISH_NUMBER;
		}
		tm = temp_mantissa;
		if (1000 > m)
		{
			exp_val = SUBSCRIPT_BIAS;
			goto ODD_INTEGER;
		}
		if (10000 > m)
		{
			exp_val = SUBSCRIPT_BIAS + 1;
			goto EVEN_INTEGER;
		}
		if (100000 > m)
		{
			exp_val =  SUBSCRIPT_BIAS + 2;
			goto ODD_INTEGER;
		}
		if (1000000 > m)
		{
			exp_val = SUBSCRIPT_BIAS + 3;
			goto EVEN_INTEGER;
		}
		if (10000000 > m)
		{
			exp_val = SUBSCRIPT_BIAS + 4;
			goto ODD_INTEGER;
		}
		if (100000000 > m)
		{
			exp_val = SUBSCRIPT_BIAS + 5;
			goto EVEN_INTEGER;
		}
		exp_val = SUBSCRIPT_BIAS + 6;
ODD_INTEGER:
		*out_ptr++ = is_negative ? ~exp_val : exp_val;
		n = mx = m / 10;
		n *= 10;
		n = m - n;
		m = mx;
		if (n)
		{
			*tm++ = cvt_table[n * 10];
			goto FINISH_INTEGERS;
		}
		goto KEEP_STRIPING;
EVEN_INTEGER:
		*out_ptr++ = is_negative ? ~exp_val: exp_val;
KEEP_STRIPING:
		while (m)
		{
			n = mx = m / 100;
			n *= 100;
			n = m - n;
			m = mx;
			if (n)
			{
				*tm++ = cvt_table[n];
				break;
			}
		}
FINISH_INTEGERS:
		while (m)
		{
			n = mx = m / 100;
			n *= 100;
			n = m - n;
			*tm++ = cvt_table[n];
			m = mx;
		}
		while (tm > temp_mantissa)
			*out_ptr++ = *--tm;
		goto FINISH_NUMBER;
	}
	/* Convert 18 digit number */
	cvt_table = pos_code;
	if ((is_negative = v->sgn) != 0)
		cvt_table = neg_code;
	*out_ptr++ = is_negative ? ~(v->e - MV_XBIAS + SUBSCRIPT_BIAS): (v->e - MV_XBIAS + SUBSCRIPT_BIAS);
	m = v->m[1];
	n = v->m[0];
	/* Strip top two digits */
	mx = m / (MANT_HI / 100);
	*out_ptr++ = cvt_table[mx];
	m = (m - (mx * (MANT_HI / 100))) * 100;
	/* The two msd's have now been converted.  The maximum number of
	 * data remaining is 7 digits in "m" and 9 digits in "n".
	 * If n is zero, then we should just grind out m till we are done
	 */
	if (n == 0)
		goto LAST_LONGWORD;
	/* there are more than 7 digits left.  First, we will put 8 digits in m, (leaving 8 digits in n) */
	mx = n / (MANT_HI / 10);
	m += mx * 10;
	n = (n - (mx * (MANT_HI / 10))) * 10;
	if (n == 0)
		goto LAST_LONGWORD;
	for (digs = 0 ; digs < 4 ; digs++)
	{
		mx = m / (MANT_HI / 100);
		*out_ptr++ = cvt_table[mx];
		m = (m - (mx * (MANT_HI / 100))) * 100;
	}
	m = n;
LAST_LONGWORD:
	while (m)
	{
		mx = m / (MANT_HI / 100);
		*out_ptr++ = cvt_table[mx];
		m = (m - (mx * (MANT_HI / 100))) * 100;
	}
FINISH_NUMBER:
	if (is_negative)
		*out_ptr++ = 0xff;
FINI:
	*out_ptr++ = 0 ; *out_ptr = 0 ;
	g->prev = g->end ;
	g->end  = out_ptr - g->base ;
	if (g->end > g->top - MAX_GVKEY_PADDING_LEN - 1)
	{	/* take of extra space and one for last zero */
		if ((end = format_targ_key(buff, MAX_ZWR_KEY_SZ, g, TRUE)) == 0)
			end = &buff[MAX_ZWR_KEY_SZ - 1];
		rts_error(VARLSTCNT(6) ERR_GVSUBOFLOW, 0, ERR_GVIS, 2, end - buff, buff);
	}
	return out_ptr;
}
