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apply: replace hard-coded constants 

Replace several 40-based constants with references to GIT_MAX_HEXSZ or
the_hash_algo, as appropriate.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
brian m. carlson 2018-10-15 00:01:59 +00:00 committed by Junio C Hamano
parent d8a3a69020
commit 93eb00f719
1 changed files with 10 additions and 8 deletions
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18
apply.c
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@ -223,8 +223,8 @@ struct patch {
struct fragment *fragments;
char *result;
size_t resultsize;
char old_sha1_prefix[41];
char new_sha1_prefix[41];
char old_sha1_prefix[GIT_MAX_HEXSZ + 1];
char new_sha1_prefix[GIT_MAX_HEXSZ + 1];
struct patch *next;

/* three-way fallback result */
@ -1093,9 +1093,10 @@ static int gitdiff_index(struct apply_state *state,
*/
const char *ptr, *eol;
int len;
const unsigned hexsz = the_hash_algo->hexsz;

ptr = strchr(line, '.');
if (!ptr || ptr[1] != '.' || 40 < ptr - line)
if (!ptr || ptr[1] != '.' || hexsz < ptr - line)
return 0;
len = ptr - line;
memcpy(patch->old_sha1_prefix, line, len);
@ -1109,7 +1110,7 @@ static int gitdiff_index(struct apply_state *state,
ptr = eol;
len = ptr - line;

if (40 < len)
if (hexsz < len)
return 0;
memcpy(patch->new_sha1_prefix, line, len);
patch->new_sha1_prefix[len] = 0;
@ -3142,13 +3143,14 @@ static int apply_binary(struct apply_state *state,
{
const char *name = patch->old_name ? patch->old_name : patch->new_name;
struct object_id oid;
const unsigned hexsz = the_hash_algo->hexsz;

/*
* For safety, we require patch index line to contain
* full 40-byte textual SHA1 for old and new, at least for now.
* full hex textual object ID for old and new, at least for now.
*/
if (strlen(patch->old_sha1_prefix) != 40 ||
strlen(patch->new_sha1_prefix) != 40 ||
if (strlen(patch->old_sha1_prefix) != hexsz ||
strlen(patch->new_sha1_prefix) != hexsz ||
get_oid_hex(patch->old_sha1_prefix, &oid) ||
get_oid_hex(patch->new_sha1_prefix, &oid))
return error(_("cannot apply binary patch to '%s' "
@ -4055,7 +4057,7 @@ static int preimage_oid_in_gitlink_patch(struct patch *p, struct object_id *oid)
starts_with(++preimage, heading) &&
/* does it record full SHA-1? */
!get_oid_hex(preimage + sizeof(heading) - 1, oid) &&
preimage[sizeof(heading) + GIT_SHA1_HEXSZ - 1] == '\n' &&
preimage[sizeof(heading) + the_hash_algo->hexsz - 1] == '\n' &&
/* does the abbreviated name on the index line agree with it? */
starts_with(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
return 0; /* it all looks fine */