merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/ewah/ewah_rlw.c

@@ -0,0 +1,106 @@
+/**
+ * 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/>.
+ */
+#include "git-compat-util.h"
+#include "ewok.h"
+#include "ewok_rlw.h"
+
+static inline int next_word(struct rlw_iterator *it)
+{
+	if (it->pointer >= it->size)
+		return 0;
+
+	it->rlw.word = &it->buffer[it->pointer];
+	it->pointer += rlw_get_literal_words(it->rlw.word) + 1;
+
+	it->rlw.literal_words = rlw_get_literal_words(it->rlw.word);
+	it->rlw.running_len = rlw_get_running_len(it->rlw.word);
+	it->rlw.running_bit = rlw_get_run_bit(it->rlw.word);
+	it->rlw.literal_word_offset = 0;
+
+	return 1;
+}
+
+void rlwit_init(struct rlw_iterator *it, struct ewah_bitmap *from_ewah)
+{
+	it->buffer = from_ewah->buffer;
+	it->size = from_ewah->buffer_size;
+	it->pointer = 0;
+
+	next_word(it);
+
+	it->literal_word_start = rlwit_literal_words(it) +
+		it->rlw.literal_word_offset;
+}
+
+void rlwit_discard_first_words(struct rlw_iterator *it, size_t x)
+{
+	while (x > 0) {
+		size_t discard;
+
+		if (it->rlw.running_len > x) {
+			it->rlw.running_len -= x;
+			return;
+		}
+
+		x -= it->rlw.running_len;
+		it->rlw.running_len = 0;
+
+		discard = (x > it->rlw.literal_words) ? it->rlw.literal_words : x;
+
+		it->literal_word_start += discard;
+		it->rlw.literal_words -= discard;
+		x -= discard;
+
+		if (x > 0 || rlwit_word_size(it) == 0) {
+			if (!next_word(it))
+				break;
+
+			it->literal_word_start =
+				rlwit_literal_words(it) + it->rlw.literal_word_offset;
+		}
+	}
+}
+
+size_t rlwit_discharge(
+	struct rlw_iterator *it, struct ewah_bitmap *out, size_t max, int negate)
+{
+	size_t index = 0;
+
+	while (index < max && rlwit_word_size(it) > 0) {
+		size_t pd, pl = it->rlw.running_len;
+
+		if (index + pl > max)
+			pl = max - index;
+
+		ewah_add_empty_words(out, it->rlw.running_bit ^ negate, pl);
+		index += pl;
+
+		pd = it->rlw.literal_words;
+		if (pd + index > max)
+			pd = max - index;
+
+		ewah_add_dirty_words(out,
+			it->buffer + it->literal_word_start, pd, negate);
+
+		rlwit_discard_first_words(it, pd + pl);
+		index += pd;
+	}
+
+	return index;
+}