undef/git-commit-vandalism
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consolidate two copies of new style object header parsing code.

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Also while we are at it, remove redundant typename[] array from
unpack_sha1_header.  The only reason it is different from the
type_names[] array in object.c module is that this code cares
about the subset of object types that are valid in a loose
object, so prepare a separate array of boolean that tells us
which types are valid, and share the name translation with the
others.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-09-01 15:17:01 -07:00
parent 501524e938
commit ad1ed5ee89
1 changed files with 46 additions and 41 deletions
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87
sha1_file.c
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@ -711,17 +711,39 @@ int legacy_loose_object(unsigned char *map)
return 0;
}
static unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
{
unsigned shift;
unsigned char c;
unsigned long size;
unsigned long used = 0;
c = buf[used++];
*type = (c >> 4) & 7;
size = c & 15;
shift = 4;
while (c & 0x80) {
if (len <= used)
return 0;
if (sizeof(long) * 8 <= shift)
return 0;
c = buf[used++];
size += (c & 0x7f) << shift;
shift += 7;
}
*sizep = size;
return used;
}
static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
{
unsigned char c;
unsigned int bits;
unsigned long size;
static const char *typename[8] = {
NULL, /* OBJ_EXT */
"commit", "tree", "blob", "tag",
NULL, NULL, NULL
unsigned long size, used;
static const char valid_loose_object_type[8] = {
0, /* OBJ_EXT */
1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
0, /* "delta" and others are invalid in a loose object */
};
const char *type;
enum object_type type;
/* Get the data stream */
memset(stream, 0, sizeof(*stream));
@ -735,22 +757,11 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon
return inflate(stream, 0);
}
c = *map++;
mapsize--;
type = typename[(c >> 4) & 7];
if (!type)
used = unpack_object_header_gently(map, mapsize, &type, &size);
if (!used || !valid_loose_object_type[type])
return -1;
bits = 4;
size = c & 0xf;
while ((c & 0x80)) {
if (bits >= 8*sizeof(long))
return -1;
c = *map++;
size += (c & 0x7f) << bits;
bits += 7;
mapsize--;
}
map += used;
mapsize -= used;
/* Set up the stream for the rest.. */
stream->next_in = map;
@ -758,7 +769,8 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon
inflateInit(stream);
/* And generate the fake traditional header */
stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size);
stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
type_names[type], size);
return 0;
}
@ -916,25 +928,18 @@ static int packed_delta_info(unsigned char *base_sha1,
static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
enum object_type *type, unsigned long *sizep)
{
unsigned shift;
unsigned char c;
unsigned long size;
unsigned long used;
if (offset >= p->pack_size)
if (p->pack_size <= offset)
die("object offset outside of pack file");
c = *((unsigned char *)p->pack_base + offset++);
*type = (c >> 4) & 7;
size = c & 15;
shift = 4;
while (c & 0x80) {
if (offset >= p->pack_size)
die("object offset outside of pack file");
c = *((unsigned char *)p->pack_base + offset++);
size += (c & 0x7f) << shift;
shift += 7;
}
*sizep = size;
return offset;
used = unpack_object_header_gently((unsigned char *)p->pack_base +
offset,
p->pack_size - offset, type, sizep);
if (!used)
die("object offset outside of pack file");
return offset + used;
}
int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,