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/*
* 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(const void *a, const void *b)
{
int64_t time_a = ((git_commit_list_node *) a)->time;
int64_t time_b = ((git_commit_list_node *) b)->time;
if (time_a < time_b)
return 1;
if (time_a > time_b)
return -1;
return 0;
}
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_mallocz(&walk->commit_pool, 1);
}
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,
const uint8_t *buffer,
size_t buffer_len)
{
const size_t parent_len = strlen("parent ") + GIT_OID_HEXSZ + 1;
const uint8_t *buffer_end = buffer + buffer_len;
const uint8_t *parents_start, *committer_start;
int i, parents = 0;
int64_t 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, (const 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 beginning 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__strtol64(&commit_time, (char *)(buffer + 1), NULL, 10) < 0))
return commit_error(commit, "cannot parse commit time");
commit->time = 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->cached.type != GIT_OBJ_COMMIT) {
giterr_set(GITERR_INVALID, "Object is no commit object");
error = -1;
} else
error = commit_quick_parse(
walk, commit,
(const uint8_t *)git_odb_object_data(obj),
git_odb_object_size(obj));
git_odb_object_free(obj);
return error;
}
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