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484257925f
The mailing address for the FSF has changed over the years. Rather than updating the address across all files, refer readers to gnu.org, as the GNU GPL documentation now suggests for license notices. The mailing address is retained in the full license files (COPYING and LGPL-2.1). The old address is still present in t/diff-lib/COPYING. This is intentional, as the file is used in tests and the contents are not expected to change. Signed-off-by: Todd Zullinger <tmz@pobox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
113 lines
3 KiB
C
113 lines
3 KiB
C
/**
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* Copyright 2013, GitHub, Inc
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* Copyright 2009-2013, Daniel Lemire, Cliff Moon,
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* David McIntosh, Robert Becho, Google Inc. and Veronika Zenz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __EWOK_RLW_H__
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#define __EWOK_RLW_H__
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#define RLW_RUNNING_BITS (sizeof(eword_t) * 4)
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#define RLW_LITERAL_BITS (sizeof(eword_t) * 8 - 1 - RLW_RUNNING_BITS)
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#define RLW_LARGEST_RUNNING_COUNT (((eword_t)1 << RLW_RUNNING_BITS) - 1)
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#define RLW_LARGEST_LITERAL_COUNT (((eword_t)1 << RLW_LITERAL_BITS) - 1)
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#define RLW_LARGEST_RUNNING_COUNT_SHIFT (RLW_LARGEST_RUNNING_COUNT << 1)
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#define RLW_RUNNING_LEN_PLUS_BIT (((eword_t)1 << (RLW_RUNNING_BITS + 1)) - 1)
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static int rlw_get_run_bit(const eword_t *word)
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{
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return *word & (eword_t)1;
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}
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static inline void rlw_set_run_bit(eword_t *word, int b)
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{
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if (b) {
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*word |= (eword_t)1;
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} else {
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*word &= (eword_t)(~1);
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}
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}
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static inline void rlw_xor_run_bit(eword_t *word)
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{
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if (*word & 1) {
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*word &= (eword_t)(~1);
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} else {
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*word |= (eword_t)1;
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}
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}
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static inline void rlw_set_running_len(eword_t *word, eword_t l)
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{
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*word |= RLW_LARGEST_RUNNING_COUNT_SHIFT;
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*word &= (l << 1) | (~RLW_LARGEST_RUNNING_COUNT_SHIFT);
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}
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static inline eword_t rlw_get_running_len(const eword_t *word)
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{
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return (*word >> 1) & RLW_LARGEST_RUNNING_COUNT;
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}
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static inline eword_t rlw_get_literal_words(const eword_t *word)
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{
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return *word >> (1 + RLW_RUNNING_BITS);
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}
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static inline void rlw_set_literal_words(eword_t *word, eword_t l)
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{
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*word |= ~RLW_RUNNING_LEN_PLUS_BIT;
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*word &= (l << (RLW_RUNNING_BITS + 1)) | RLW_RUNNING_LEN_PLUS_BIT;
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}
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static inline eword_t rlw_size(const eword_t *self)
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{
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return rlw_get_running_len(self) + rlw_get_literal_words(self);
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}
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struct rlw_iterator {
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const eword_t *buffer;
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size_t size;
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size_t pointer;
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size_t literal_word_start;
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struct {
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const eword_t *word;
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int literal_words;
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int running_len;
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int literal_word_offset;
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int running_bit;
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} rlw;
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};
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void rlwit_init(struct rlw_iterator *it, struct ewah_bitmap *bitmap);
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void rlwit_discard_first_words(struct rlw_iterator *it, size_t x);
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size_t rlwit_discharge(
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struct rlw_iterator *it, struct ewah_bitmap *out, size_t max, int negate);
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void rlwit_discharge_empty(struct rlw_iterator *it, struct ewah_bitmap *out);
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static inline size_t rlwit_word_size(struct rlw_iterator *it)
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{
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return it->rlw.running_len + it->rlw.literal_words;
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}
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static inline size_t rlwit_literal_words(struct rlw_iterator *it)
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{
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return it->pointer - it->rlw.literal_words;
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}
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#endif
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