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Commit c960d6a3 by Ramsay Jones Committed by Shawn O. Pearce
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Add a routine to determine a git_oid given an git_obj 

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
parent 007e0753
Showing with 479 additions and 0 deletions
src/git/odb.h
......@@ -138,6 +138,20 @@ GIT_EXTERN(git_otype) git_obj_string_to_type(const char *str);
*/
GIT_EXTERN(int) git_obj__loose_object_type(git_otype type);
/**
* Determine the object-ID (sha1 hash) of the given git_obj.
*
* The input obj must be a valid loose object type and the data
* pointer must not be NULL, unless the len field is also zero.
*
* @param id the resulting object-ID.
* @param obj the object whose hash is to be determined.
* @return
* - GIT_SUCCESS if the object-ID was correctly determined.
* - GIT_ERROR if the given object is malformed.
*/
GIT_EXTERN(int) git_obj_hash(git_oid *id, git_obj *obj);
/** @} */
GIT_END_DECL
#endif
src/odb.c
......@@ -27,6 +27,8 @@
#include "git/zlib.h"
#include "common.h"
#include "fileops.h"
#include "hash.h"
#include <stdio.h>
struct git_odb {
/** Path to the "objects" directory. */
......@@ -83,6 +85,46 @@ int git_obj__loose_object_type(git_otype type)
return obj_type_table[type].loose;
}
static int format_object_header(char *hdr, size_t n, git_obj *obj)
{
const char *type_str = git_obj_type_to_string(obj->type);
int len = snprintf(hdr, n, "%s %u", type_str, obj->len);
assert(len > 0); /* otherwise snprintf() is broken */
assert(len < n); /* otherwise the caller is broken! */
if (len < 0 || len >= n)
return GIT_ERROR;
return len+1;
}
int git_obj_hash(git_oid *id, git_obj *obj)
{
git_buf_vec vec[2];
char hdr[64];
int hdrlen;
assert(id && obj);
if (!git_obj__loose_object_type(obj->type))
return GIT_ERROR;
if (!obj->data && obj->len != 0)
return GIT_ERROR;
if ((hdrlen = format_object_header(hdr, sizeof(hdr), obj)) < 0)
return GIT_ERROR;
vec[0].data = hdr;
vec[0].len = hdrlen;
vec[1].data = obj->data;
vec[1].len = obj->len;
git_hash_vec(id, vec, 2);
return GIT_SUCCESS;
}
static int object_file_name(char *name, size_t n, char *dir, const git_oid *id)
{
size_t len = strlen(dir);
......
tests/t0000-obj-hash.c 0 → 100644
#include "test_lib.h"
#include <git/odb.h>
static char *commit_id = "3d7f8a6af076c8c3f20071a8935cdbe8228594d1";
static unsigned char commit_data[] = {
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};
static git_obj commit_obj = {
commit_data,
sizeof(commit_data),
GIT_OBJ_COMMIT
};
static char *tree_id = "dff2da90b254e1beb889d1f1f1288be1803782df";
static unsigned char tree_data[] = {
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0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91,
};
static git_obj tree_obj = {
tree_data,
sizeof(tree_data),
GIT_OBJ_TREE
};
static char *tag_id = "09d373e1dfdc16b129ceec6dd649739911541e05";
static unsigned char tag_data[] = {
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};
static git_obj tag_obj = {
tag_data,
sizeof(tag_data),
GIT_OBJ_TAG
};
static char *zero_id = "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391";
static unsigned char zero_data[] = {
0x00 /* dummy data */
};
static git_obj zero_obj = {
zero_data,
0,
GIT_OBJ_BLOB
};
static char *one_id = "8b137891791fe96927ad78e64b0aad7bded08bdc";
static unsigned char one_data[] = {
0x0a,
};
static git_obj one_obj = {
one_data,
sizeof(one_data),
GIT_OBJ_BLOB
};
static char *two_id = "78981922613b2afb6025042ff6bd878ac1994e85";
static unsigned char two_data[] = {
0x61, 0x0a,
};
static git_obj two_obj = {
two_data,
sizeof(two_data),
GIT_OBJ_BLOB
};
static char *some_id = "fd8430bc864cfcd5f10e5590f8a447e01b942bfe";
static unsigned char some_data[] = {
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};
static git_obj some_obj = {
some_data,
sizeof(some_data),
GIT_OBJ_BLOB
};
static git_obj junk_obj = {
NULL,
0,
GIT_OBJ_BAD
};
BEGIN_TEST(hash_junk)
git_oid id, id_zero;
must_pass(git_oid_mkstr(&id_zero, zero_id));
/* invalid types: */
junk_obj.data = some_data;
must_fail(git_obj_hash(&id, &junk_obj));
junk_obj.type = GIT_OBJ__EXT1;
must_fail(git_obj_hash(&id, &junk_obj));
junk_obj.type = GIT_OBJ__EXT2;
must_fail(git_obj_hash(&id, &junk_obj));
junk_obj.type = GIT_OBJ_OFS_DELTA;
must_fail(git_obj_hash(&id, &junk_obj));
junk_obj.type = GIT_OBJ_REF_DELTA;
must_fail(git_obj_hash(&id, &junk_obj));
/* data can be NULL only if len is zero: */
junk_obj.type = GIT_OBJ_BLOB;
junk_obj.data = NULL;
must_pass(git_obj_hash(&id, &junk_obj));
must_be_true(git_oid_cmp(&id, &id_zero) == 0);
junk_obj.len = 1;
must_fail(git_obj_hash(&id, &junk_obj));
END_TEST
BEGIN_TEST(hash_commit)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, commit_id));
must_pass(git_obj_hash(&id2, &commit_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_tree)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, tree_id));
must_pass(git_obj_hash(&id2, &tree_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_tag)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, tag_id));
must_pass(git_obj_hash(&id2, &tag_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_zero)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, zero_id));
must_pass(git_obj_hash(&id2, &zero_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_one)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, one_id));
must_pass(git_obj_hash(&id2, &one_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_two)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, two_id));
must_pass(git_obj_hash(&id2, &two_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
BEGIN_TEST(hash_some)
git_oid id1, id2;
must_pass(git_oid_mkstr(&id1, some_id));
must_pass(git_obj_hash(&id2, &some_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
END_TEST
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