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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)

{

const git_commit_list_node *commit_a = a;

const git_commit_list_node *commit_b = 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,

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;

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, (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__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->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;

}