| /** |
| * Copyright 2013, GitHub, Inc |
| * Copyright 2009-2013, Daniel Lemire, Cliff Moon, |
| * David McIntosh, Robert Becho, Google Inc. and Veronika Zenz |
| * |
| * This program 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; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * 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, see <http://www.gnu.org/licenses/>. |
| */ |
| #ifndef __EWOK_RLW_H__ |
| #define __EWOK_RLW_H__ |
| |
| #define RLW_RUNNING_BITS (sizeof(eword_t) * 4) |
| #define RLW_LITERAL_BITS (sizeof(eword_t) * 8 - 1 - RLW_RUNNING_BITS) |
| |
| #define RLW_LARGEST_RUNNING_COUNT (((eword_t)1 << RLW_RUNNING_BITS) - 1) |
| #define RLW_LARGEST_LITERAL_COUNT (((eword_t)1 << RLW_LITERAL_BITS) - 1) |
| |
| #define RLW_LARGEST_RUNNING_COUNT_SHIFT (RLW_LARGEST_RUNNING_COUNT << 1) |
| |
| #define RLW_RUNNING_LEN_PLUS_BIT (((eword_t)1 << (RLW_RUNNING_BITS + 1)) - 1) |
| |
| static int rlw_get_run_bit(const eword_t *word) |
| { |
| return *word & (eword_t)1; |
| } |
| |
| static inline void rlw_set_run_bit(eword_t *word, int b) |
| { |
| if (b) { |
| *word |= (eword_t)1; |
| } else { |
| *word &= (eword_t)(~1); |
| } |
| } |
| |
| static inline void rlw_xor_run_bit(eword_t *word) |
| { |
| if (*word & 1) { |
| *word &= (eword_t)(~1); |
| } else { |
| *word |= (eword_t)1; |
| } |
| } |
| |
| static inline void rlw_set_running_len(eword_t *word, eword_t l) |
| { |
| *word |= RLW_LARGEST_RUNNING_COUNT_SHIFT; |
| *word &= (l << 1) | (~RLW_LARGEST_RUNNING_COUNT_SHIFT); |
| } |
| |
| static inline eword_t rlw_get_running_len(const eword_t *word) |
| { |
| return (*word >> 1) & RLW_LARGEST_RUNNING_COUNT; |
| } |
| |
| static inline eword_t rlw_get_literal_words(const eword_t *word) |
| { |
| return *word >> (1 + RLW_RUNNING_BITS); |
| } |
| |
| static inline void rlw_set_literal_words(eword_t *word, eword_t l) |
| { |
| *word |= ~RLW_RUNNING_LEN_PLUS_BIT; |
| *word &= (l << (RLW_RUNNING_BITS + 1)) | RLW_RUNNING_LEN_PLUS_BIT; |
| } |
| |
| static inline eword_t rlw_size(const eword_t *self) |
| { |
| return rlw_get_running_len(self) + rlw_get_literal_words(self); |
| } |
| |
| struct rlw_iterator { |
| const eword_t *buffer; |
| size_t size; |
| size_t pointer; |
| size_t literal_word_start; |
| |
| struct { |
| const eword_t *word; |
| int literal_words; |
| int running_len; |
| int literal_word_offset; |
| int running_bit; |
| } rlw; |
| }; |
| |
| void rlwit_init(struct rlw_iterator *it, struct ewah_bitmap *bitmap); |
| void rlwit_discard_first_words(struct rlw_iterator *it, size_t x); |
| size_t rlwit_discharge( |
| struct rlw_iterator *it, struct ewah_bitmap *out, size_t max, int negate); |
| |
| static inline size_t rlwit_word_size(struct rlw_iterator *it) |
| { |
| return it->rlw.running_len + it->rlw.literal_words; |
| } |
| |
| static inline size_t rlwit_literal_words(struct rlw_iterator *it) |
| { |
| return it->pointer - it->rlw.literal_words; |
| } |
| |
| #endif |