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-rw-r--r--builtin/pack-objects.c26
-rw-r--r--pack-objects.h23
2 files changed, 38 insertions, 11 deletions
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index cccd0f8..88d2bb8 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -34,10 +34,12 @@
#define IN_PACK(obj) oe_in_pack(&to_pack, obj)
#define SIZE(obj) oe_size(&to_pack, obj)
#define SET_SIZE(obj,size) oe_set_size(&to_pack, obj, size)
+#define DELTA_SIZE(obj) oe_delta_size(&to_pack, obj)
#define DELTA(obj) oe_delta(&to_pack, obj)
#define DELTA_CHILD(obj) oe_delta_child(&to_pack, obj)
#define DELTA_SIBLING(obj) oe_delta_sibling(&to_pack, obj)
#define SET_DELTA(obj, val) oe_set_delta(&to_pack, obj, val)
+#define SET_DELTA_SIZE(obj, val) oe_set_delta_size(&to_pack, obj, val)
#define SET_DELTA_CHILD(obj, val) oe_set_delta_child(&to_pack, obj, val)
#define SET_DELTA_SIBLING(obj, val) oe_set_delta_sibling(&to_pack, obj, val)
@@ -144,7 +146,7 @@ static void *get_delta(struct object_entry *entry)
oid_to_hex(&DELTA(entry)->idx.oid));
delta_buf = diff_delta(base_buf, base_size,
buf, size, &delta_size, 0);
- if (!delta_buf || delta_size != entry->delta_size)
+ if (!delta_buf || delta_size != DELTA_SIZE(entry))
die("delta size changed");
free(buf);
free(base_buf);
@@ -294,14 +296,14 @@ static unsigned long write_no_reuse_object(struct hashfile *f, struct object_ent
FREE_AND_NULL(entry->delta_data);
entry->z_delta_size = 0;
} else if (entry->delta_data) {
- size = entry->delta_size;
+ size = DELTA_SIZE(entry);
buf = entry->delta_data;
entry->delta_data = NULL;
type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
} else {
buf = get_delta(entry);
- size = entry->delta_size;
+ size = DELTA_SIZE(entry);
type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
}
@@ -1509,7 +1511,7 @@ static void check_object(struct object_entry *entry)
oe_set_type(entry, entry->in_pack_type);
SET_SIZE(entry, in_pack_size); /* delta size */
SET_DELTA(entry, base_entry);
- entry->delta_size = in_pack_size;
+ SET_DELTA_SIZE(entry, in_pack_size);
entry->delta_sibling_idx = base_entry->delta_child_idx;
SET_DELTA_CHILD(base_entry, entry);
unuse_pack(&w_curs);
@@ -1937,7 +1939,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
max_size = trg_size/2 - 20;
ref_depth = 1;
} else {
- max_size = trg_entry->delta_size;
+ max_size = DELTA_SIZE(trg_entry);
ref_depth = trg->depth;
}
max_size = (uint64_t)max_size * (max_depth - src->depth) /
@@ -2006,10 +2008,14 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
if (!delta_buf)
return 0;
+ if (delta_size >= (1U << OE_DELTA_SIZE_BITS)) {
+ free(delta_buf);
+ return 0;
+ }
if (DELTA(trg_entry)) {
/* Prefer only shallower same-sized deltas. */
- if (delta_size == trg_entry->delta_size &&
+ if (delta_size == DELTA_SIZE(trg_entry) &&
src->depth + 1 >= trg->depth) {
free(delta_buf);
return 0;
@@ -2024,7 +2030,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
free(trg_entry->delta_data);
cache_lock();
if (trg_entry->delta_data) {
- delta_cache_size -= trg_entry->delta_size;
+ delta_cache_size -= DELTA_SIZE(trg_entry);
trg_entry->delta_data = NULL;
}
if (delta_cacheable(src_size, trg_size, delta_size)) {
@@ -2037,7 +2043,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
}
SET_DELTA(trg_entry, src_entry);
- trg_entry->delta_size = delta_size;
+ SET_DELTA_SIZE(trg_entry, delta_size);
trg->depth = src->depth + 1;
return 1;
@@ -2160,11 +2166,11 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
if (entry->delta_data && !pack_to_stdout) {
unsigned long size;
- size = do_compress(&entry->delta_data, entry->delta_size);
+ size = do_compress(&entry->delta_data, DELTA_SIZE(entry));
if (size < (1U << OE_Z_DELTA_BITS)) {
entry->z_delta_size = size;
cache_lock();
- delta_cache_size -= entry->delta_size;
+ delta_cache_size -= DELTA_SIZE(entry);
delta_cache_size += entry->z_delta_size;
cache_unlock();
} else {
diff --git a/pack-objects.h b/pack-objects.h
index ee2c7ab..1c58818 100644
--- a/pack-objects.h
+++ b/pack-objects.h
@@ -12,6 +12,7 @@
* above this limit. Don't lower it too much.
*/
#define OE_SIZE_BITS 31
+#define OE_DELTA_SIZE_BITS 20
/*
* State flags for depth-first search used for analyzing delta cycles.
@@ -85,7 +86,8 @@ struct object_entry {
* uses the same base as me
*/
void *delta_data; /* cached delta (uncompressed) */
- unsigned long delta_size; /* delta data size (uncompressed) */
+ unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
+ unsigned delta_size_valid:1;
unsigned z_delta_size:OE_Z_DELTA_BITS;
unsigned type_:TYPE_BITS;
unsigned in_pack_type:TYPE_BITS; /* could be delta */
@@ -309,4 +311,23 @@ static inline void oe_set_size(struct packing_data *pack,
}
}
+static inline unsigned long oe_delta_size(struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->delta_size_valid)
+ return e->delta_size_;
+ return oe_size(pack, e);
+}
+
+static inline void oe_set_delta_size(struct packing_data *pack,
+ struct object_entry *e,
+ unsigned long size)
+{
+ e->delta_size_ = size;
+ e->delta_size_valid = e->delta_size_ == size;
+ if (!e->delta_size_valid && size != oe_size(pack, e))
+ BUG("this can only happen in check_object() "
+ "where delta size is the same as entry size");
+}
+
#endif