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/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file 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; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <time.h>
#include "common.h"
#include "commit.h"
#include "revwalk.h"
#include "git/odb.h"
const git_oid *git_commit_id(git_commit *c)
{
return &c->id;
}
git_commit *git_commit_lookup(git_revpool *pool, const git_oid *id)
{
git_obj commit_obj;
git_commit *commit = NULL;
/*
* TODO: check if the commit is already cached in the
* revpool instead of loading it from the odb
*/
if (git_odb_read(&commit_obj, pool->db, id) < 0)
return NULL;
if (commit_obj.type != GIT_OBJ_COMMIT)
goto error_cleanup;
commit = git__malloc(sizeof(git_commit));
memset(commit, 0x0, sizeof(git_commit));
git_oid_cpy(&commit->id, id);
commit->pool = pool;
if (git_commit__parse_buffer(commit, commit_obj.data, commit_obj.len) < 0)
goto error_cleanup;
return commit;
error_cleanup:
git_obj_close(&commit_obj);
free(commit);
return NULL;
}
int git_commit__parse_time(time_t *commit_time, char *buffer, const char *buffer_end)
{
if (memcmp(buffer, "author ", 7) != 0)
return -1;
buffer = memchr(buffer, '\n', buffer_end - buffer);
if (buffer == 0 || buffer >= buffer_end)
return -1;
if (memcmp(buffer, "committer ", 10) != 0)
return -1;
buffer = memchr(buffer, '\n', buffer_end - buffer);
if (buffer == 0 || buffer >= buffer_end)
return -1;
*commit_time = strtol(buffer, &buffer, 10);
return (buffer < buffer_end) ? 0 : -1;
}
int git_commit__parse_oid(git_oid *oid, char **buffer_out, const char *buffer_end, const char *header)
{
size_t sha_len = GIT_OID_HEXSZ;
size_t header_len = strlen(header);
char *buffer = *buffer_out;
if (buffer + (header_len + sha_len + 1) > buffer_end)
return -1;
if (memcmp(buffer, header, header_len) != 0)
return -1;
if (buffer[header_len + sha_len] != '\n')
return -1;
if (git_oid_mkstr(oid, buffer + header_len) < 0)
return -1;
*buffer_out = buffer + (header_len + sha_len + 1);
return 0;
}
int git_commit__parse_buffer(git_commit *commit, void *data, size_t len)
{
char *buffer = (char *)data;
const char *buffer_end = (char *)data + len;
git_oid oid;
if (commit->parsed)
return 0;
if (git_commit__parse_oid(&oid, &buffer, buffer_end, "tree ") < 0)
return -1;
/*
* TODO: load tree into commit object
* TODO: commit grafts!
*/
while (git_commit__parse_oid(&oid, &buffer, buffer_end, "parent ") == 0) {
git_commit *parent;
if ((parent = git_commit_lookup(commit->pool, &oid)) == NULL)
return -1;
// TODO: push the new commit into the revpool
}
if (git_commit__parse_time(&commit->commit_time, buffer, buffer_end) < 0)
return -1;
commit->parsed = 1;
return 0;
}
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