dumb-http: do not pass NULL path to parse_pack_index
[git.git] / ewah / ewok_rlw.h
blob63efdf969886889b5c09e055f37088a998122155
1 /**
2 * Copyright 2013, GitHub, Inc
3 * Copyright 2009-2013, Daniel Lemire, Cliff Moon,
4 * David McIntosh, Robert Becho, Google Inc. and Veronika Zenz
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 #ifndef __EWOK_RLW_H__
21 #define __EWOK_RLW_H__
23 #define RLW_RUNNING_BITS (sizeof(eword_t) * 4)
24 #define RLW_LITERAL_BITS (sizeof(eword_t) * 8 - 1 - RLW_RUNNING_BITS)
26 #define RLW_LARGEST_RUNNING_COUNT (((eword_t)1 << RLW_RUNNING_BITS) - 1)
27 #define RLW_LARGEST_LITERAL_COUNT (((eword_t)1 << RLW_LITERAL_BITS) - 1)
29 #define RLW_LARGEST_RUNNING_COUNT_SHIFT (RLW_LARGEST_RUNNING_COUNT << 1)
31 #define RLW_RUNNING_LEN_PLUS_BIT (((eword_t)1 << (RLW_RUNNING_BITS + 1)) - 1)
33 static int rlw_get_run_bit(const eword_t *word)
35 return *word & (eword_t)1;
38 static inline void rlw_set_run_bit(eword_t *word, int b)
40 if (b) {
41 *word |= (eword_t)1;
42 } else {
43 *word &= (eword_t)(~1);
47 static inline void rlw_xor_run_bit(eword_t *word)
49 if (*word & 1) {
50 *word &= (eword_t)(~1);
51 } else {
52 *word |= (eword_t)1;
56 static inline void rlw_set_running_len(eword_t *word, eword_t l)
58 *word |= RLW_LARGEST_RUNNING_COUNT_SHIFT;
59 *word &= (l << 1) | (~RLW_LARGEST_RUNNING_COUNT_SHIFT);
62 static inline eword_t rlw_get_running_len(const eword_t *word)
64 return (*word >> 1) & RLW_LARGEST_RUNNING_COUNT;
67 static inline eword_t rlw_get_literal_words(const eword_t *word)
69 return *word >> (1 + RLW_RUNNING_BITS);
72 static inline void rlw_set_literal_words(eword_t *word, eword_t l)
74 *word |= ~RLW_RUNNING_LEN_PLUS_BIT;
75 *word &= (l << (RLW_RUNNING_BITS + 1)) | RLW_RUNNING_LEN_PLUS_BIT;
78 static inline eword_t rlw_size(const eword_t *self)
80 return rlw_get_running_len(self) + rlw_get_literal_words(self);
83 struct rlw_iterator {
84 const eword_t *buffer;
85 size_t size;
86 size_t pointer;
87 size_t literal_word_start;
89 struct {
90 const eword_t *word;
91 int literal_words;
92 int running_len;
93 int literal_word_offset;
94 int running_bit;
95 } rlw;
98 void rlwit_init(struct rlw_iterator *it, struct ewah_bitmap *bitmap);
99 void rlwit_discard_first_words(struct rlw_iterator *it, size_t x);
100 size_t rlwit_discharge(
101 struct rlw_iterator *it, struct ewah_bitmap *out, size_t max, int negate);
102 void rlwit_discharge_empty(struct rlw_iterator *it, struct ewah_bitmap *out);
104 static inline size_t rlwit_word_size(struct rlw_iterator *it)
106 return it->rlw.running_len + it->rlw.literal_words;
109 static inline size_t rlwit_literal_words(struct rlw_iterator *it)
111 return it->pointer - it->rlw.literal_words;
114 #endif