зеркало из https://github.com/microsoft/git.git
Merge branch 'sp/maint-index-pack' into maint
* sp/maint-index-pack: index-pack: Honor core.deltaBaseCacheLimit when resolving deltas index-pack: Track the object_entry that creates each base_data index-pack: Chain the struct base_data on the stack for traversal index-pack: Refactor base arguments of resolve_delta into a struct
This commit is contained in:
Junio C Hamano
Коммит
fcf74dbfca
142
index-pack.c
142
index-pack.c
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@ -26,6 +26,14 @@ union delta_base {
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off_t offset;
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};
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struct base_data {
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struct base_data *base;
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struct base_data *child;
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struct object_entry *obj;
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void *data;
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unsigned long size;
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};
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/*
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* Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
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* to memcmp() only the first 20 bytes.
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@ -43,6 +51,8 @@ struct delta_entry
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static struct object_entry *objects;
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static struct delta_entry *deltas;
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static struct base_data *base_cache;
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static size_t base_cache_used;
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static int nr_objects;
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static int nr_deltas;
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static int nr_resolved_deltas;
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@ -210,6 +220,46 @@ static void bad_object(unsigned long offset, const char *format, ...)
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die("pack has bad object at offset %lu: %s", offset, buf);
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}
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static void prune_base_data(struct base_data *retain)
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{
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struct base_data *b = base_cache;
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for (b = base_cache;
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base_cache_used > delta_base_cache_limit && b;
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b = b->child) {
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if (b->data && b != retain) {
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free(b->data);
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b->data = NULL;
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base_cache_used -= b->size;
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}
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}
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}
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static void link_base_data(struct base_data *base, struct base_data *c)
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{
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if (base)
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base->child = c;
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else
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base_cache = c;
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c->base = base;
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c->child = NULL;
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base_cache_used += c->size;
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prune_base_data(c);
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}
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static void unlink_base_data(struct base_data *c)
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{
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struct base_data *base = c->base;
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if (base)
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base->child = NULL;
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else
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base_cache = NULL;
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if (c->data) {
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free(c->data);
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base_cache_used -= c->size;
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}
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}
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static void *unpack_entry_data(unsigned long offset, unsigned long size)
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{
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z_stream stream;
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@ -425,33 +475,60 @@ static void sha1_object(const void *data, unsigned long size,
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}
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}
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static void resolve_delta(struct object_entry *delta_obj, void *base_data,
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unsigned long base_size, enum object_type type)
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static void *get_base_data(struct base_data *c)
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{
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if (!c->data) {
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struct object_entry *obj = c->obj;
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if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
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void *base = get_base_data(c->base);
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void *raw = get_data_from_pack(obj);
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c->data = patch_delta(
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base, c->base->size,
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raw, obj->size,
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&c->size);
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free(raw);
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if (!c->data)
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bad_object(obj->idx.offset, "failed to apply delta");
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} else
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c->data = get_data_from_pack(obj);
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base_cache_used += c->size;
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prune_base_data(c);
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}
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return c->data;
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}
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static void resolve_delta(struct object_entry *delta_obj,
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struct base_data *base_obj, enum object_type type)
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{
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void *delta_data;
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unsigned long delta_size;
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void *result;
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unsigned long result_size;
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union delta_base delta_base;
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int j, first, last;
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struct base_data result;
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delta_obj->real_type = type;
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delta_data = get_data_from_pack(delta_obj);
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delta_size = delta_obj->size;
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result = patch_delta(base_data, base_size, delta_data, delta_size,
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&result_size);
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result.data = patch_delta(get_base_data(base_obj), base_obj->size,
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delta_data, delta_size,
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&result.size);
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free(delta_data);
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if (!result)
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if (!result.data)
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bad_object(delta_obj->idx.offset, "failed to apply delta");
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sha1_object(result, result_size, type, delta_obj->idx.sha1);
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sha1_object(result.data, result.size, type, delta_obj->idx.sha1);
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nr_resolved_deltas++;
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result.obj = delta_obj;
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link_base_data(base_obj, &result);
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hashcpy(delta_base.sha1, delta_obj->idx.sha1);
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if (!find_delta_children(&delta_base, &first, &last)) {
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for (j = first; j <= last; j++) {
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struct object_entry *child = objects + deltas[j].obj_no;
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if (child->real_type == OBJ_REF_DELTA)
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resolve_delta(child, result, result_size, type);
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resolve_delta(child, &result, type);
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}
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}
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@ -461,11 +538,11 @@ static void resolve_delta(struct object_entry *delta_obj, void *base_data,
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for (j = first; j <= last; j++) {
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struct object_entry *child = objects + deltas[j].obj_no;
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if (child->real_type == OBJ_OFS_DELTA)
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resolve_delta(child, result, result_size, type);
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resolve_delta(child, &result, type);
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}
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}
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free(result);
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unlink_base_data(&result);
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}
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static int compare_delta_entry(const void *a, const void *b)
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@ -480,7 +557,6 @@ static void parse_pack_objects(unsigned char *sha1)
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{
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int i;
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struct delta_entry *delta = deltas;
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void *data;
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struct stat st;
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/*
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@ -495,7 +571,7 @@ static void parse_pack_objects(unsigned char *sha1)
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nr_objects);
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for (i = 0; i < nr_objects; i++) {
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struct object_entry *obj = &objects[i];
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data = unpack_raw_entry(obj, &delta->base);
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void *data = unpack_raw_entry(obj, &delta->base);
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obj->real_type = obj->type;
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if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
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nr_deltas++;
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@ -544,6 +620,7 @@ static void parse_pack_objects(unsigned char *sha1)
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struct object_entry *obj = &objects[i];
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union delta_base base;
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int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
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struct base_data base_obj;
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if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
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continue;
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@ -554,22 +631,24 @@ static void parse_pack_objects(unsigned char *sha1)
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ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
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if (!ref && !ofs)
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continue;
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data = get_data_from_pack(obj);
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base_obj.data = get_data_from_pack(obj);
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base_obj.size = obj->size;
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base_obj.obj = obj;
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link_base_data(NULL, &base_obj);
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if (ref)
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for (j = ref_first; j <= ref_last; j++) {
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struct object_entry *child = objects + deltas[j].obj_no;
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if (child->real_type == OBJ_REF_DELTA)
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resolve_delta(child, data,
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obj->size, obj->type);
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resolve_delta(child, &base_obj, obj->type);
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}
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if (ofs)
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for (j = ofs_first; j <= ofs_last; j++) {
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struct object_entry *child = objects + deltas[j].obj_no;
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if (child->real_type == OBJ_OFS_DELTA)
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resolve_delta(child, data,
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obj->size, obj->type);
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resolve_delta(child, &base_obj, obj->type);
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}
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free(data);
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unlink_base_data(&base_obj);
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display_progress(progress, nr_resolved_deltas);
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}
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}
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@ -600,7 +679,8 @@ static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_c
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return size;
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}
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static void append_obj_to_pack(const unsigned char *sha1, void *buf,
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static struct object_entry *append_obj_to_pack(
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const unsigned char *sha1, void *buf,
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unsigned long size, enum object_type type)
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{
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struct object_entry *obj = &objects[nr_objects++];
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@ -621,6 +701,7 @@ static void append_obj_to_pack(const unsigned char *sha1, void *buf,
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obj[1].idx.offset = obj[0].idx.offset + n;
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obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
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hashcpy(obj->idx.sha1, sha1);
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return obj;
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}
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static int delta_pos_compare(const void *_a, const void *_b)
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@ -655,28 +736,31 @@ static void fix_unresolved_deltas(int nr_unresolved)
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for (i = 0; i < n; i++) {
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struct delta_entry *d = sorted_by_pos[i];
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void *data;
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unsigned long size;
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enum object_type type;
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int j, first, last;
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struct base_data base_obj;
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if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
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continue;
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data = read_sha1_file(d->base.sha1, &type, &size);
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if (!data)
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base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
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if (!base_obj.data)
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continue;
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if (check_sha1_signature(d->base.sha1, base_obj.data,
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base_obj.size, typename(type)))
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die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
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base_obj.obj = append_obj_to_pack(d->base.sha1, base_obj.data,
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base_obj.size, type);
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link_base_data(NULL, &base_obj);
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find_delta_children(&d->base, &first, &last);
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for (j = first; j <= last; j++) {
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struct object_entry *child = objects + deltas[j].obj_no;
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if (child->real_type == OBJ_REF_DELTA)
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resolve_delta(child, data, size, type);
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resolve_delta(child, &base_obj, type);
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}
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if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
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die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
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append_obj_to_pack(d->base.sha1, data, size, type);
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free(data);
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unlink_base_data(&base_obj);
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display_progress(progress, nr_resolved_deltas);
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}
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free(sorted_by_pos);
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