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/*
* Column Compression
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2018 OpenLink Software
*
* This project is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License, dated June 1991.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#undef CE_BITS_TGT
#ifdef CE_BITS_RANGE
#define CE_BITS_TGT(repeating_place) \
{last_row++; if (last_row >= last_of_ce) return last_row; target = last_row;}
#else
#define CE_BITS_TGT(repeating_place) \
{ \
if (++itc->itc_match_in >= itc->itc_n_matches) \
return CE_AT_END; \
target = itc->itc_matches[itc->itc_match_in]; \
if (target == last_row) \
goto repeating_place; \
if (target >= last_of_ce) \
return target; \
last_row++; \
}
#endif
int
CE_NAME (col_pos_t * cpo, db_buf_t ce_first, int n_values, int n_bytes)
{
it_cursor_t * itc = cpo->cpo_itc;
data_col_t * dc = cpo->cpo_dc;
int64 base, base_1, first;
uint32 date_base = 0;
db_buf_t ce = cpo->cpo_ce;
db_buf_t ce_first_val, ce_end = ce_first + n_bytes;
int first_len, dtp_cmp;
int skip = cpo->cpo_skip;
dtp_t flags = *cpo->cpo_ce;
int last_row = cpo->cpo_ce_row_no;
db_buf_t body;
int byte = 0, bit = 0;
CED_VARS
int to = cpo->cpo_to;
int target;
#ifdef CE_BITS_RANGE
int last_of_ce = MIN (last_row + n_values, cpo->cpo_to);
#else
int last_of_ce = last_row + n_values;
#endif
CE_FIRST;
CED_CHECK;
if (!enable_bits_dec)
return 0;
if (0 == skip)
{
repeat_first:
CE_OUT (ce_first_val, first_len, first);
CE_BITS_TGT (repeat_first);
skip = target - last_row;
byte = bit = 0;
ce_skip_bits_2 (ce_first, skip, &byte, &bit);
last_row += skip;
}
else
{
ce_skip_bits_2 (ce_first, skip - 1, &byte, &bit);
last_row += skip;
}
for (;;)
{
repeat_val:
CE_OUT (ce_first_val, first_len, first + byte * 8 + bit + 1);
CE_BITS_TGT (repeat_val);
bit++;
skip = target - last_row;
if (8 == bit)
{
byte++;
bit = 0;
}
ce_skip_bits_2 (ce_first, skip, &byte, &bit);
#ifndef CE_BITS_RANGE
last_row = target;
#endif
}
}
#undef CE_NAME
#undef CE_BITS_RANGE
#undef CE_OUT
#undef CED_VARS
#undef ELT_DTP
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