1 files changed, 431 insertions, 0 deletions
diff --git a/src/util/vector.c b/src/util/vector.c
new file mode 100644
index 000000000..4a4bc8c0e
--- /dev/null
+++ b/src/util/vector.c
@@ -0,0 +1,431 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "vector.h"
+
+#include "integer.h"
+
+/* In elements, not bytes */
+#define MIN_ALLOCSIZE	8
+
+GIT_INLINE(size_t) compute_new_size(git_vector *v)
+{
+	size_t new_size = v->_alloc_size;
+
+	/* Use a resize factor of 1.5, which is quick to compute using integer
+	 * instructions and less than the golden ratio (1.618...) */
+	if (new_size < MIN_ALLOCSIZE)
+		new_size = MIN_ALLOCSIZE;
+	else if (new_size <= (SIZE_MAX / 3) * 2)
+		new_size += new_size / 2;
+	else
+		new_size = SIZE_MAX;
+
+	return new_size;
+}
+
+GIT_INLINE(int) resize_vector(git_vector *v, size_t new_size)
+{
+	void *new_contents;
+
+	if (new_size == 0)
+		return 0;
+
+	new_contents = git__reallocarray(v->contents, new_size, sizeof(void *));
+	GIT_ERROR_CHECK_ALLOC(new_contents);
+
+	v->_alloc_size = new_size;
+	v->contents = new_contents;
+
+	return 0;
+}
+
+int git_vector_size_hint(git_vector *v, size_t size_hint)
+{
+	if (v->_alloc_size >= size_hint)
+		return 0;
+	return resize_vector(v, size_hint);
+}
+
+int git_vector_dup(git_vector *v, const git_vector *src, git_vector_cmp cmp)
+{
+	GIT_ASSERT_ARG(v);
+	GIT_ASSERT_ARG(src);
+
+	v->_alloc_size = 0;
+	v->contents = NULL;
+	v->_cmp = cmp ? cmp : src->_cmp;
+	v->length = src->length;
+	v->flags  = src->flags;
+	if (cmp != src->_cmp)
+		git_vector_set_sorted(v, 0);
+
+	if (src->length) {
+		size_t bytes;
+		GIT_ERROR_CHECK_ALLOC_MULTIPLY(&bytes, src->length, sizeof(void *));
+		v->contents = git__malloc(bytes);
+		GIT_ERROR_CHECK_ALLOC(v->contents);
+		v->_alloc_size = src->length;
+		memcpy(v->contents, src->contents, bytes);
+	}
+
+	return 0;
+}
+
+void git_vector_free(git_vector *v)
+{
+	if (!v)
+		return;
+
+	git__free(v->contents);
+	v->contents = NULL;
+
+	v->length = 0;
+	v->_alloc_size = 0;
+}
+
+void git_vector_free_deep(git_vector *v)
+{
+	size_t i;
+
+	if (!v)
+		return;
+
+	for (i = 0; i < v->length; ++i) {
+		git__free(v->contents[i]);
+		v->contents[i] = NULL;
+	}
+
+	git_vector_free(v);
+}
+
+int git_vector_init(git_vector *v, size_t initial_size, git_vector_cmp cmp)
+{
+	GIT_ASSERT_ARG(v);
+
+	v->_alloc_size = 0;
+	v->_cmp = cmp;
+	v->length = 0;
+	v->flags = GIT_VECTOR_SORTED;
+	v->contents = NULL;
+
+	return resize_vector(v, max(initial_size, MIN_ALLOCSIZE));
+}
+
+void **git_vector_detach(size_t *size, size_t *asize, git_vector *v)
+{
+	void **data = v->contents;
+
+	if (size)
+		*size = v->length;
+	if (asize)
+		*asize = v->_alloc_size;
+
+	v->_alloc_size = 0;
+	v->length   = 0;
+	v->contents = NULL;
+
+	return data;
+}
+
+int git_vector_insert(git_vector *v, void *element)
+{
+	GIT_ASSERT_ARG(v);
+
+	if (v->length >= v->_alloc_size &&
+		resize_vector(v, compute_new_size(v)) < 0)
+		return -1;
+
+	v->contents[v->length++] = element;
+
+	git_vector_set_sorted(v, v->length <= 1);
+
+	return 0;
+}
+
+int git_vector_insert_sorted(
+	git_vector *v, void *element, int (*on_dup)(void **old, void *new))
+{
+	int result;
+	size_t pos;
+
+	GIT_ASSERT_ARG(v);
+	GIT_ASSERT(v->_cmp);
+
+	if (!git_vector_is_sorted(v))
+		git_vector_sort(v);
+
+	if (v->length >= v->_alloc_size &&
+		resize_vector(v, compute_new_size(v)) < 0)
+		return -1;
+
+	/* If we find the element and have a duplicate handler callback,
+	 * invoke it.  If it returns non-zero, then cancel insert, otherwise
+	 * proceed with normal insert.
+	 */
+	if (!git__bsearch(v->contents, v->length, element, v->_cmp, &pos) &&
+		on_dup && (result = on_dup(&v->contents[pos], element)) < 0)
+		return result;
+
+	/* shift elements to the right */
+	if (pos < v->length)
+		memmove(v->contents + pos + 1, v->contents + pos,
+		        (v->length - pos) * sizeof(void *));
+
+	v->contents[pos] = element;
+	v->length++;
+
+	return 0;
+}
+
+void git_vector_sort(git_vector *v)
+{
+	if (git_vector_is_sorted(v) || !v->_cmp)
+		return;
+
+	if (v->length > 1)
+		git__tsort(v->contents, v->length, v->_cmp);
+	git_vector_set_sorted(v, 1);
+}
+
+int git_vector_bsearch2(
+	size_t *at_pos,
+	git_vector *v,
+	git_vector_cmp key_lookup,
+	const void *key)
+{
+	GIT_ASSERT_ARG(v);
+	GIT_ASSERT_ARG(key);
+	GIT_ASSERT(key_lookup);
+
+	/* need comparison function to sort the vector */
+	if (!v->_cmp)
+		return -1;
+
+	git_vector_sort(v);
+
+	return git__bsearch(v->contents, v->length, key, key_lookup, at_pos);
+}
+
+int git_vector_search2(
+	size_t *at_pos, const git_vector *v, git_vector_cmp key_lookup, const void *key)
+{
+	size_t i;
+
+	GIT_ASSERT_ARG(v);
+	GIT_ASSERT_ARG(key);
+	GIT_ASSERT(key_lookup);
+
+	for (i = 0; i < v->length; ++i) {
+		if (key_lookup(key, v->contents[i]) == 0) {
+			if (at_pos)
+				*at_pos = i;
+
+			return 0;
+		}
+	}
+
+	return GIT_ENOTFOUND;
+}
+
+static int strict_comparison(const void *a, const void *b)
+{
+	return (a == b) ? 0 : -1;
+}
+
+int git_vector_search(size_t *at_pos, const git_vector *v, const void *entry)
+{
+	return git_vector_search2(at_pos, v, v->_cmp ? v->_cmp : strict_comparison, entry);
+}
+
+int git_vector_remove(git_vector *v, size_t idx)
+{
+	size_t shift_count;
+
+	GIT_ASSERT_ARG(v);
+
+	if (idx >= v->length)
+		return GIT_ENOTFOUND;
+
+	shift_count = v->length - idx - 1;
+
+	if (shift_count)
+		memmove(&v->contents[idx], &v->contents[idx + 1],
+			shift_count * sizeof(void *));
+
+	v->length--;
+	return 0;
+}
+
+void git_vector_pop(git_vector *v)
+{
+	if (v->length > 0)
+		v->length--;
+}
+
+void git_vector_uniq(git_vector *v, void  (*git_free_cb)(void *))
+{
+	git_vector_cmp cmp;
+	size_t i, j;
+
+	if (v->length <= 1)
+		return;
+
+	git_vector_sort(v);
+	cmp = v->_cmp ? v->_cmp : strict_comparison;
+
+	for (i = 0, j = 1 ; j < v->length; ++j)
+		if (!cmp(v->contents[i], v->contents[j])) {
+			if (git_free_cb)
+				git_free_cb(v->contents[i]);
+
+			v->contents[i] = v->contents[j];
+		} else
+			v->contents[++i] = v->contents[j];
+
+	v->length -= j - i - 1;
+}
+
+void git_vector_remove_matching(
+	git_vector *v,
+	int (*match)(const git_vector *v, size_t idx, void *payload),
+	void *payload)
+{
+	size_t i, j;
+
+	for (i = 0, j = 0; j < v->length; ++j) {
+		v->contents[i] = v->contents[j];
+
+		if (!match(v, i, payload))
+			i++;
+	}
+
+	v->length = i;
+}
+
+void git_vector_clear(git_vector *v)
+{
+	v->length = 0;
+	git_vector_set_sorted(v, 1);
+}
+
+void git_vector_swap(git_vector *a, git_vector *b)
+{
+	git_vector t;
+
+	if (a != b) {
+		memcpy(&t, a, sizeof(t));
+		memcpy(a, b, sizeof(t));
+		memcpy(b, &t, sizeof(t));
+	}
+}
+
+int git_vector_resize_to(git_vector *v, size_t new_length)
+{
+	if (new_length > v->_alloc_size &&
+		resize_vector(v, new_length) < 0)
+		return -1;
+
+	if (new_length > v->length)
+		memset(&v->contents[v->length], 0,
+			sizeof(void *) * (new_length - v->length));
+
+	v->length = new_length;
+
+	return 0;
+}
+
+int git_vector_insert_null(git_vector *v, size_t idx, size_t insert_len)
+{
+	size_t new_length;
+
+	GIT_ASSERT_ARG(insert_len > 0);
+	GIT_ASSERT_ARG(idx <= v->length);
+
+	GIT_ERROR_CHECK_ALLOC_ADD(&new_length, v->length, insert_len);
+
+	if (new_length > v->_alloc_size && resize_vector(v, new_length) < 0)
+		return -1;
+
+	memmove(&v->contents[idx + insert_len], &v->contents[idx],
+		sizeof(void *) * (v->length - idx));
+	memset(&v->contents[idx], 0, sizeof(void *) * insert_len);
+
+	v->length = new_length;
+	return 0;
+}
+
+int git_vector_remove_range(git_vector *v, size_t idx, size_t remove_len)
+{
+	size_t new_length = v->length - remove_len;
+	size_t end_idx = 0;
+
+	GIT_ASSERT_ARG(remove_len > 0);
+
+	if (git__add_sizet_overflow(&end_idx, idx, remove_len))
+		GIT_ASSERT(0);
+
+	GIT_ASSERT(end_idx <= v->length);
+
+	if (end_idx < v->length)
+		memmove(&v->contents[idx], &v->contents[end_idx],
+			sizeof(void *) * (v->length - end_idx));
+
+	memset(&v->contents[new_length], 0, sizeof(void *) * remove_len);
+
+	v->length = new_length;
+	return 0;
+}
+
+int git_vector_set(void **old, git_vector *v, size_t position, void *value)
+{
+	if (position + 1 > v->length) {
+		if (git_vector_resize_to(v, position + 1) < 0)
+			return -1;
+	}
+
+	if (old != NULL)
+		*old = v->contents[position];
+
+	v->contents[position] = value;
+
+	return 0;
+}
+
+int git_vector_verify_sorted(const git_vector *v)
+{
+	size_t i;
+
+	if (!git_vector_is_sorted(v))
+		return -1;
+
+	for (i = 1; i < v->length; ++i) {
+		if (v->_cmp(v->contents[i - 1], v->contents[i]) > 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+void git_vector_reverse(git_vector *v)
+{
+	size_t a, b;
+
+	if (v->length == 0)
+		return;
+
+	a = 0;
+	b = v->length - 1;
+
+	while (a < b) {
+		void *tmp = v->contents[a];
+		v->contents[a] = v->contents[b];
+		v->contents[b] = tmp;
+		a++;
+		b--;
+	}
+}