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-rw-r--r--pack-objects.c45
1 files changed, 28 insertions, 17 deletions
diff --git a/pack-objects.c b/pack-objects.c
index 47da33b..b486ea5 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -970,11 +970,12 @@ struct unpacked {
* one.
*/
static int try_delta(struct unpacked *trg, struct unpacked *src,
- struct delta_index *src_index, unsigned max_depth)
+ unsigned max_depth)
{
struct object_entry *trg_entry = trg->entry;
struct object_entry *src_entry = src->entry;
- unsigned long size, src_size, delta_size, sizediff, max_size;
+ unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
+ char type[10];
void *delta_buf;
/* Don't bother doing diffs between different types */
@@ -1009,19 +1010,38 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
return 0;
/* Now some size filtering heuristics. */
- size = trg_entry->size;
- max_size = size/2 - 20;
+ trg_size = trg_entry->size;
+ max_size = trg_size/2 - 20;
max_size = max_size * (max_depth - src_entry->depth) / max_depth;
if (max_size == 0)
return 0;
if (trg_entry->delta && trg_entry->delta_size <= max_size)
max_size = trg_entry->delta_size-1;
src_size = src_entry->size;
- sizediff = src_size < size ? size - src_size : 0;
+ sizediff = src_size < trg_size ? trg_size - src_size : 0;
if (sizediff >= max_size)
return 0;
- delta_buf = create_delta(src_index, trg->data, size, &delta_size, max_size);
+ /* Load data if not already done */
+ if (!trg->data) {
+ trg->data = read_sha1_file(trg_entry->sha1, type, &sz);
+ if (sz != trg_size)
+ die("object %s inconsistent object length (%lu vs %lu)",
+ sha1_to_hex(trg_entry->sha1), sz, trg_size);
+ }
+ if (!src->data) {
+ src->data = read_sha1_file(src_entry->sha1, type, &sz);
+ if (sz != src_size)
+ die("object %s inconsistent object length (%lu vs %lu)",
+ sha1_to_hex(src_entry->sha1), sz, src_size);
+ }
+ if (!src->index) {
+ src->index = create_delta_index(src->data, src_size);
+ if (!src->index)
+ die("out of memory");
+ }
+
+ delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
if (!delta_buf)
return 0;
@@ -1054,8 +1074,6 @@ static void find_deltas(struct object_entry **list, int window, int depth)
while (--i >= 0) {
struct object_entry *entry = list[i];
struct unpacked *n = array + idx;
- unsigned long size;
- char type[10];
int j;
if (!entry->preferred_base)
@@ -1082,11 +1100,8 @@ static void find_deltas(struct object_entry **list, int window, int depth)
free_delta_index(n->index);
n->index = NULL;
free(n->data);
+ n->data = NULL;
n->entry = entry;
- n->data = read_sha1_file(entry->sha1, type, &size);
- if (size != entry->size)
- die("object %s inconsistent object length (%lu vs %lu)",
- sha1_to_hex(entry->sha1), size, entry->size);
j = window;
while (--j > 0) {
@@ -1097,7 +1112,7 @@ static void find_deltas(struct object_entry **list, int window, int depth)
m = array + other_idx;
if (!m->entry)
break;
- if (try_delta(n, m, m->index, depth) < 0)
+ if (try_delta(n, m, depth) < 0)
break;
}
/* if we made n a delta, and if n is already at max
@@ -1107,10 +1122,6 @@ static void find_deltas(struct object_entry **list, int window, int depth)
if (entry->delta && depth <= entry->depth)
continue;
- n->index = create_delta_index(n->data, size);
- if (!n->index)
- die("out of memory");
-
idx++;
if (idx >= window)
idx = 0;