Junio C Hamano <gitster@xxxxxxxxx> writes:
> Looking at how we collect information on normal objects, it may make
> more sense to model this after sha1_loose_object_info(), with a
> tweak to struct object_info datatype, and integrate it into
> sha1_object_info_extended() may make more sense, perhaps along the
> lines of the attached patch.
>
> The new helper would mimick what sha1_loose_object_info() is doing,
> in that it may be used to learn on-disk size, object size, typename
> string (returned in oi->typename strbuf that is optional). There is
> no sensible value to stuff in oi->typep if the incoming object name
> refers to the experimental invalid object, so perhaps you will store
> OBJ_NONE or something there and the "cat-file --literally" would use
> the oi->typename to learn the name of the "type".
You may be able to even reuse most of the sha1_loose_object_info()
by doing something like this illustration (read: incomplete) patch:
* add an optional typename pointer to object_info request structure
for the caller to ask sha1_object_info() to fill.
* unpack_sha1_header() takes advantage of the fact that the object
header of a usual object of known type would fit within 32 bytes,
and that otherwise the object is invalid anyway. A literal
reader cannot afford to rely on these assumptions, so introduce a
reader that can read into a strbuf, and use it instead from
sha1_loose_object_info() when the caller wants to deal with
invalid object with a possibly overlong header.
* teach sha1_object_info_extended() pass the "flags" parameter from
the caller down the callchain to sha1_loose_object_info().
cache.h | 3 ++-
sha1_file.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 62 insertions(+), 7 deletions(-)
diff --git a/cache.h b/cache.h
index 4d02efc..34ede34 100644
--- a/cache.h
+++ b/cache.h
@@ -828,8 +828,8 @@ char *strip_path_suffix(const char *path, const char *suffix);
int daemon_avoid_alias(const char *path);
extern int is_ntfs_dotgit(const char *name);
-/* object replacement */
#define LOOKUP_REPLACE_OBJECT 1
+#define LOOKUP_LITERALLY 2
extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
{
@@ -1296,6 +1296,7 @@ struct object_info {
unsigned long *sizep;
unsigned long *disk_sizep;
unsigned char *delta_base_sha1;
+ struct strbuf *typename;
/* Response */
enum {
diff --git a/sha1_file.c b/sha1_file.c
index 69a60ec..0f6783e 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1564,6 +1564,36 @@ int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long ma
return git_inflate(stream, 0);
}
+static int unpack_sha1_header_literally(git_zstream *stream, unsigned char *map,
+ unsigned long mapsize,
+ struct strbuf *header)
+{
+ unsigned char buffer[32], *cp;
+ unsigned long bufsiz = sizeof(buffer);
+ int status;
+
+ /* Get the data stream */
+ memset(stream, 0, sizeof(*stream));
+ stream->next_in = map;
+ stream->avail_in = mapsize;
+ stream->next_out = buffer;
+ stream->avail_out = bufsiz;
+
+ git_inflate_init(stream);
+
+ do {
+ status = git_inflate(stream, 0);
+ strbuf_add(header, buffer, stream->next_out - buffer);
+ for (cp = buffer; cp < stream->next_out; cp++)
+ if (!*cp)
+ /* Found the NUL at the end of the header */
+ return 0;
+ stream->next_out = buffer;
+ stream->avail_out = bufsiz;
+ } while (status == Z_OK);
+ return -1;
+}
+
static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
{
int bytes = strlen(buffer) + 1;
@@ -2524,13 +2554,16 @@ struct packed_git *find_sha1_pack(const unsigned char *sha1,
}
static int sha1_loose_object_info(const unsigned char *sha1,
- struct object_info *oi)
+ struct object_info *oi,
+ unsigned flags)
{
int status;
unsigned long mapsize, size;
void *map;
git_zstream stream;
char hdr[32];
+ struct strbuf hdrbuf = STRBUF_INIT;
+ char *hdrp;
if (oi->delta_base_sha1)
hashclr(oi->delta_base_sha1);
@@ -2557,10 +2590,21 @@ static int sha1_loose_object_info(const unsigned char *sha1,
return -1;
if (oi->disk_sizep)
*oi->disk_sizep = mapsize;
- if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
- status = error("unable to unpack %s header",
- sha1_to_hex(sha1));
- else if ((status = parse_sha1_header(hdr, &size)) < 0)
+ if ((flags & LOOKUP_LITERALLY)) {
+ if (unpack_sha1_header_literally(&stream, map, mapsize, &hdrbuf) < 0)
+ status = error("unable to unpack %s header",
+ sha1_to_hex(sha1));
+ hdrp = hdrbuf.buf;
+ } else {
+ if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
+ status = error("unable to unpack %s header",
+ sha1_to_hex(sha1));
+ hdrp = hdr;
+ }
+
+ if (status)
+ ; /* we already have error condition */
+ else if ((status = parse_sha1_header(hdrp, &size)) < 0)
status = error("unable to parse %s header", sha1_to_hex(sha1));
else if (oi->sizep)
*oi->sizep = size;
@@ -2568,6 +2612,16 @@ static int sha1_loose_object_info(const unsigned char *sha1,
munmap(map, mapsize);
if (oi->typep)
*oi->typep = status;
+ if (oi->typename) {
+ if (0 <= status && typename(status))
+ strbuf_addstr(oi->typename, typename(status));
+ else if ((flags & LOOKUP_LITERALLY)) {
+ size_t typelen = strcspn(hdrbuf.buf, " ");
+ strbuf_add(oi->typename, hdrbuf.buf, typelen);
+ }
+ }
+ if (hdrp == hdrbuf.buf)
+ strbuf_release(&hdrbuf);
return 0;
}
@@ -2594,7 +2648,7 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
if (!find_pack_entry(real, &e)) {
/* Most likely it's a loose object. */
- if (!sha1_loose_object_info(real, oi)) {
+ if (!sha1_loose_object_info(real, oi, flags)) {
oi->whence = OI_LOOSE;
return 0;
}
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