1 files changed, 194 insertions, 0 deletions
diff --git a/src/commit_list.c b/src/commit_list.c
new file mode 100644
index 000000000..603dd754a
--- /dev/null
+++ b/src/commit_list.c
@@ -0,0 +1,194 @@
+/*
+ * 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 "commit_list.h"
+#include "common.h"
+#include "revwalk.h"
+#include "pool.h"
+#include "odb.h"
+
+int git_commit_list_time_cmp(void *a, void *b)
+{
+	git_commit_list_node *commit_a = (git_commit_list_node *)a;
+	git_commit_list_node *commit_b = (git_commit_list_node *)b;
+
+	return (commit_a->time < commit_b->time);
+}
+
+git_commit_list *git_commit_list_insert(git_commit_list_node *item, git_commit_list **list_p)
+{
+	git_commit_list *new_list = git__malloc(sizeof(git_commit_list));
+	if (new_list != NULL) {
+		new_list->item = item;
+		new_list->next = *list_p;
+	}
+	*list_p = new_list;
+	return new_list;
+}
+
+git_commit_list *git_commit_list_insert_by_date(git_commit_list_node *item, git_commit_list **list_p)
+{
+	git_commit_list **pp = list_p;
+	git_commit_list *p;
+
+	while ((p = *pp) != NULL) {
+		if (git_commit_list_time_cmp(p->item, item) < 0)
+			break;
+
+		pp = &p->next;
+	}
+
+	return git_commit_list_insert(item, pp);
+}
+
+git_commit_list_node *git_commit_list_alloc_node(git_revwalk *walk)
+{
+	return (git_commit_list_node *)git_pool_malloc(&walk->commit_pool, COMMIT_ALLOC);
+}
+
+static int commit_error(git_commit_list_node *commit, const char *msg)
+{
+	char commit_oid[GIT_OID_HEXSZ + 1];
+	git_oid_fmt(commit_oid, &commit->oid);
+	commit_oid[GIT_OID_HEXSZ] = '\0';
+
+	giterr_set(GITERR_ODB, "Failed to parse commit %s - %s", commit_oid, msg);
+
+	return -1;
+}
+
+static git_commit_list_node **alloc_parents(
+	git_revwalk *walk, git_commit_list_node *commit, size_t n_parents)
+{
+	if (n_parents <= PARENTS_PER_COMMIT)
+		return (git_commit_list_node **)((char *)commit + sizeof(git_commit_list_node));
+
+	return (git_commit_list_node **)git_pool_malloc(
+		&walk->commit_pool, (uint32_t)(n_parents * sizeof(git_commit_list_node *)));
+}
+
+
+void git_commit_list_free(git_commit_list **list_p)
+{
+	git_commit_list *list = *list_p;
+
+	if (list == NULL)
+		return;
+
+	while (list) {
+		git_commit_list *temp = list;
+		list = temp->next;
+		git__free(temp);
+	}
+
+	*list_p = NULL;
+}
+
+git_commit_list_node *git_commit_list_pop(git_commit_list **stack)
+{
+	git_commit_list *top = *stack;
+	git_commit_list_node *item = top ? top->item : NULL;
+
+	if (top) {
+		*stack = top->next;
+		git__free(top);
+	}
+	return item;
+}
+
+static int commit_quick_parse(git_revwalk *walk, git_commit_list_node *commit, git_rawobj *raw)
+{
+	const size_t parent_len = strlen("parent ") + GIT_OID_HEXSZ + 1;
+	unsigned char *buffer = raw->data;
+	unsigned char *buffer_end = buffer + raw->len;
+	unsigned char *parents_start, *committer_start;
+	int i, parents = 0;
+	int commit_time;
+
+	buffer += strlen("tree ") + GIT_OID_HEXSZ + 1;
+
+	parents_start = buffer;
+	while (buffer + parent_len < buffer_end && memcmp(buffer, "parent ", strlen("parent ")) == 0) {
+		parents++;
+		buffer += parent_len;
+	}
+
+	commit->parents = alloc_parents(walk, commit, parents);
+	GITERR_CHECK_ALLOC(commit->parents);
+
+	buffer = parents_start;
+	for (i = 0; i < parents; ++i) {
+		git_oid oid;
+
+		if (git_oid_fromstr(&oid, (char *)buffer + strlen("parent ")) < 0)
+			return -1;
+
+		commit->parents[i] = git_revwalk__commit_lookup(walk, &oid);
+		if (commit->parents[i] == NULL)
+			return -1;
+
+		buffer += parent_len;
+	}
+
+	commit->out_degree = (unsigned short)parents;
+
+	if ((committer_start = buffer = memchr(buffer, '\n', buffer_end - buffer)) == NULL)
+		return commit_error(commit, "object is corrupted");
+
+	buffer++;
+
+	if ((buffer = memchr(buffer, '\n', buffer_end - buffer)) == NULL)
+		return commit_error(commit, "object is corrupted");
+
+	/* Skip trailing spaces */
+	while (buffer > committer_start && git__isspace(*buffer))
+		buffer--;
+
+	/* Seek for the begining of the pack of digits */
+	while (buffer > committer_start && git__isdigit(*buffer))
+		buffer--;
+
+	/* Skip potential timezone offset */
+	if ((buffer > committer_start) && (*buffer == '+' || *buffer == '-')) {
+		buffer--;
+
+		while (buffer > committer_start && git__isspace(*buffer))
+			buffer--;
+
+		while (buffer > committer_start && git__isdigit(*buffer))
+			buffer--;
+	}
+
+	if ((buffer == committer_start) || (git__strtol32(&commit_time, (char *)(buffer + 1), NULL, 10) < 0))
+		return commit_error(commit, "cannot parse commit time");
+
+	commit->time = (time_t)commit_time;
+	commit->parsed = 1;
+	return 0;
+}
+
+int git_commit_list_parse(git_revwalk *walk, git_commit_list_node *commit)
+{
+	git_odb_object *obj;
+	int error;
+
+	if (commit->parsed)
+		return 0;
+
+	if ((error = git_odb_read(&obj, walk->odb, &commit->oid)) < 0)
+		return error;
+
+	if (obj->raw.type != GIT_OBJ_COMMIT) {
+		giterr_set(GITERR_INVALID, "Object is no commit object");
+		error = -1;
+	} else
+		error = commit_quick_parse(walk, commit, &obj->raw);
+
+	git_odb_object_free(obj);
+	return error;
+}
+