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Add pretend_sha1_file() interface.

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The new interface allows an application to temporarily hash a
small number of objects and pretend that they are available in
the object store without actually writing them.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2007-02-04 21:42:38 -08:00
parent 1cfe77333f
commit d66b37bb19
2 changed files with 58 additions and 0 deletions
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1
cache.h
View File

@ -257,6 +257,7 @@ extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, uns
extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
extern int pretend_sha1_file(void *, unsigned long, const char *, unsigned char *);
extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);

57
sha1_file.c
View File

@ -1505,10 +1505,67 @@ static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned lo
return unpack_entry(e.p, e.offset, type, size);
}
/*
* This is meant to hold a *small* number of objects that you would
* want read_sha1_file() to be able to return, but yet you do not want
* to write them into the object store (e.g. a browse-only
* application).
*/
static struct cached_object {
unsigned char sha1[20];
const char *type;
void *buf;
unsigned long size;
} *cached_objects;
static int cached_object_nr, cached_object_alloc;
static struct cached_object *find_cached_object(const unsigned char *sha1)
{
int i;
struct cached_object *co = cached_objects;
for (i = 0; i < cached_object_nr; i++, co++) {
if (!hashcmp(co->sha1, sha1))
return co;
}
return NULL;
}
int pretend_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1)
{
struct cached_object *co;
hash_sha1_file(buf, len, type, sha1);
if (has_sha1_file(sha1) || find_cached_object(sha1))
return 0;
if (cached_object_alloc <= cached_object_nr) {
cached_object_alloc = alloc_nr(cached_object_alloc);
cached_objects = xrealloc(cached_objects,
sizeof(*cached_objects) *
cached_object_alloc);
}
co = &cached_objects[cached_object_nr++];
co->size = len;
co->type = strdup(type);
hashcpy(co->sha1, sha1);
return 0;
}
void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
{
unsigned long mapsize;
void *map, *buf;
struct cached_object *co;
co = find_cached_object(sha1);
if (co) {
buf = xmalloc(co->size + 1);
memcpy(buf, co->buf, co->size);
((char*)buf)[co->size] = 0;
strcpy(type, co->type);
*size = co->size;
return buf;
}
buf = read_packed_sha1(sha1, type, size);
if (buf)