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https://github.com/git/git
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Merge branch 'jc/pack-reuse'
* jc/pack-reuse: pack-objects: avoid delta chains that are too long. git-repack: allow passing a couple of flags to pack-objects. pack-objects: finishing touches. pack-objects: reuse data from existing packs.
This commit is contained in:
Junio C Hamano
commit
155d12912f
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@ -8,7 +8,10 @@ git-pack-objects - Create a packed archive of objects.
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SYNOPSIS
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--------
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'git-pack-objects' [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list
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[verse]
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'git-pack-objects' [-q] [--no-reuse-delta] [--non-empty]
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[--local] [--incremental] [--window=N] [--depth=N]
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{--stdout | base-name} < object-list
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DESCRIPTION
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@ -32,6 +35,10 @@ Placing both in the pack/ subdirectory of $GIT_OBJECT_DIRECTORY (or
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any of the directories on $GIT_ALTERNATE_OBJECT_DIRECTORIES)
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enables git to read from such an archive.
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In a packed archive, an object is either stored as a compressed
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whole, or as a difference from some other object. The latter is
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often called a delta.
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OPTIONS
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-------
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@ -74,6 +81,18 @@ base-name::
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Only create a packed archive if it would contain at
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least one object.
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-q::
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This flag makes the command not to report its progress
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on the standard error stream.
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--no-reuse-delta::
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When creating a packed archive in a repository that
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has existing packs, the command reuses existing deltas.
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This sometimes results in a slightly suboptimal pack.
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This flag tells the command not to reuse existing deltas
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but compute them from scratch.
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org>
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@ -9,7 +9,7 @@ objects into pack files.
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SYNOPSIS
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--------
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'git-repack' [-a] [-d] [-l] [-n]
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'git-repack' [-a] [-d] [-f] [-l] [-n] [-q]
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DESCRIPTION
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-----------
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@ -43,6 +43,14 @@ OPTIONS
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Pass the `--local` option to `git pack-objects`, see
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gitlink:git-pack-objects[1].
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-f::
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Pass the `--no-reuse-delta` option to `git pack-objects`, see
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gitlink:git-pack-objects[1].
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-q::
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Pass the `-q` option to `git pack-objects`, see
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gitlink:git-pack-objects[1].
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-n::
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Do not update the server information with
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`git update-server-info`.
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@ -3,17 +3,20 @@
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# Copyright (c) 2005 Linus Torvalds
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#
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USAGE='[-a] [-d] [-l] [-n]'
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USAGE='[-a] [-d] [-f] [-l] [-n] [-q]'
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. git-sh-setup
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no_update_info= all_into_one= remove_redundant= local=
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no_update_info= all_into_one= remove_redundant=
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local= quiet= no_reuse_delta=
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while case "$#" in 0) break ;; esac
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do
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case "$1" in
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-n) no_update_info=t ;;
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-a) all_into_one=t ;;
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-d) remove_redundant=t ;;
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-l) local=t ;;
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-q) quiet=-q ;;
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-f) no_reuse_delta=--no-reuse-delta ;;
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-l) local=--local ;;
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*) usage ;;
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esac
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shift
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@ -39,9 +42,7 @@ case ",$all_into_one," in
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find . -type f \( -name '*.pack' -o -name '*.idx' \) -print`
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;;
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esac
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if [ "$local" ]; then
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pack_objects="$pack_objects --local"
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fi
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pack_objects="$pack_objects $local $quiet $no_reuse_delta"
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name=$(git-rev-list --objects $rev_list $(git-rev-parse $rev_parse) 2>&1 |
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git-pack-objects --non-empty $pack_objects .tmp-pack) ||
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exit 1
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446
pack-objects.c
446
pack-objects.c
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@ -5,21 +5,45 @@
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#include "csum-file.h"
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#include <sys/time.h>
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static const char pack_usage[] = "git-pack-objects [-q] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
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static const char pack_usage[] = "git-pack-objects [-q] [--no-reuse-delta] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
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struct object_entry {
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unsigned char sha1[20];
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unsigned long size;
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unsigned long offset;
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unsigned int depth;
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unsigned int hash;
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unsigned long size; /* uncompressed size */
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unsigned long offset; /* offset into the final pack file;
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* nonzero if already written.
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*/
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unsigned int depth; /* delta depth */
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unsigned int delta_limit; /* base adjustment for in-pack delta */
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unsigned int hash; /* name hint hash */
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enum object_type type;
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unsigned long delta_size;
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struct object_entry *delta;
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enum object_type in_pack_type; /* could be delta */
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unsigned long delta_size; /* delta data size (uncompressed) */
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struct object_entry *delta; /* delta base object */
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struct packed_git *in_pack; /* already in pack */
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unsigned int in_pack_offset;
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struct object_entry *delta_child; /* delitified objects who bases me */
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struct object_entry *delta_sibling; /* other deltified objects who
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* uses the same base as me
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*/
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};
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/*
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* Objects we are going to pack are colected in objects array (dynamically
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* expanded). nr_objects & nr_alloc controls this array. They are stored
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* in the order we see -- typically rev-list --objects order that gives us
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* nice "minimum seek" order.
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*
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* sorted-by-sha ans sorted-by-type are arrays of pointers that point at
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* elements in the objects array. The former is used to build the pack
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* index (lists object names in the ascending order to help offset lookup),
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* and the latter is used to group similar things together by try_delta()
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* heuristics.
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*/
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static unsigned char object_list_sha1[20];
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static int non_empty = 0;
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static int no_reuse_delta = 0;
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static int local = 0;
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static int incremental = 0;
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static struct object_entry **sorted_by_sha, **sorted_by_type;
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@ -29,6 +53,137 @@ static const char *base_name;
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static unsigned char pack_file_sha1[20];
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static int progress = 1;
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/*
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* The object names in objects array are hashed with this hashtable,
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* to help looking up the entry by object name. Binary search from
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* sorted_by_sha is also possible but this was easier to code and faster.
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* This hashtable is built after all the objects are seen.
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*/
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static int *object_ix = NULL;
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static int object_ix_hashsz = 0;
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/*
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* Pack index for existing packs give us easy access to the offsets into
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* corresponding pack file where each object's data starts, but the entries
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* do not store the size of the compressed representation (uncompressed
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* size is easily available by examining the pack entry header). We build
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* a hashtable of existing packs (pack_revindex), and keep reverse index
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* here -- pack index file is sorted by object name mapping to offset; this
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* pack_revindex[].revindex array is an ordered list of offsets, so if you
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* know the offset of an object, next offset is where its packed
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* representation ends.
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*/
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struct pack_revindex {
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struct packed_git *p;
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unsigned long *revindex;
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} *pack_revindex = NULL;
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static int pack_revindex_hashsz = 0;
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/*
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* stats
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*/
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static int written = 0;
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static int written_delta = 0;
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static int reused = 0;
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static int reused_delta = 0;
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static int pack_revindex_ix(struct packed_git *p)
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{
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unsigned int ui = (unsigned int) p;
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int i;
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ui = ui ^ (ui >> 16); /* defeat structure alignment */
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i = (int)(ui % pack_revindex_hashsz);
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while (pack_revindex[i].p) {
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if (pack_revindex[i].p == p)
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return i;
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if (++i == pack_revindex_hashsz)
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i = 0;
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}
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return -1 - i;
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}
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static void prepare_pack_ix(void)
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{
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int num;
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struct packed_git *p;
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for (num = 0, p = packed_git; p; p = p->next)
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num++;
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if (!num)
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return;
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pack_revindex_hashsz = num * 11;
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pack_revindex = xcalloc(sizeof(*pack_revindex), pack_revindex_hashsz);
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for (p = packed_git; p; p = p->next) {
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num = pack_revindex_ix(p);
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num = - 1 - num;
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pack_revindex[num].p = p;
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}
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/* revindex elements are lazily initialized */
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}
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static int cmp_offset(const void *a_, const void *b_)
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{
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unsigned long a = *(unsigned long *) a_;
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unsigned long b = *(unsigned long *) b_;
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if (a < b)
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return -1;
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else if (a == b)
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return 0;
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else
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return 1;
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}
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/*
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* Ordered list of offsets of objects in the pack.
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*/
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static void prepare_pack_revindex(struct pack_revindex *rix)
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{
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struct packed_git *p = rix->p;
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int num_ent = num_packed_objects(p);
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int i;
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void *index = p->index_base + 256;
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rix->revindex = xmalloc(sizeof(unsigned long) * (num_ent + 1));
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for (i = 0; i < num_ent; i++) {
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long hl = *((long *)(index + 24 * i));
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rix->revindex[i] = ntohl(hl);
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}
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/* This knows the pack format -- the 20-byte trailer
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* follows immediately after the last object data.
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*/
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rix->revindex[num_ent] = p->pack_size - 20;
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qsort(rix->revindex, num_ent, sizeof(unsigned long), cmp_offset);
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}
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static unsigned long find_packed_object_size(struct packed_git *p,
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unsigned long ofs)
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{
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int num;
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int lo, hi;
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struct pack_revindex *rix;
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unsigned long *revindex;
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num = pack_revindex_ix(p);
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if (num < 0)
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die("internal error: pack revindex uninitialized");
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rix = &pack_revindex[num];
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if (!rix->revindex)
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prepare_pack_revindex(rix);
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revindex = rix->revindex;
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lo = 0;
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hi = num_packed_objects(p) + 1;
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do {
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int mi = (lo + hi) / 2;
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if (revindex[mi] == ofs) {
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return revindex[mi+1] - ofs;
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}
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else if (ofs < revindex[mi])
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hi = mi;
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else
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lo = mi + 1;
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} while (lo < hi);
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die("internal error: pack revindex corrupt");
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}
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static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
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{
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unsigned long othersize, delta_size;
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@ -78,35 +233,69 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry
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{
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unsigned long size;
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char type[10];
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void *buf = read_sha1_file(entry->sha1, type, &size);
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void *buf;
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unsigned char header[10];
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unsigned hdrlen, datalen;
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enum object_type obj_type;
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int to_reuse = 0;
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if (!buf)
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die("unable to read %s", sha1_to_hex(entry->sha1));
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if (size != entry->size)
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die("object %s size inconsistency (%lu vs %lu)", sha1_to_hex(entry->sha1), size, entry->size);
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|
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/*
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* The object header is a byte of 'type' followed by zero or
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* more bytes of length. For deltas, the 20 bytes of delta sha1
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* follows that.
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*/
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obj_type = entry->type;
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if (entry->delta) {
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buf = delta_against(buf, size, entry);
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size = entry->delta_size;
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obj_type = OBJ_DELTA;
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if (! entry->in_pack)
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to_reuse = 0; /* can't reuse what we don't have */
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else if (obj_type == OBJ_DELTA)
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to_reuse = 1; /* check_object() decided it for us */
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else if (obj_type != entry->in_pack_type)
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to_reuse = 0; /* pack has delta which is unusable */
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else if (entry->delta)
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to_reuse = 0; /* we want to pack afresh */
|
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else
|
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to_reuse = 1; /* we have it in-pack undeltified,
|
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* and we do not need to deltify it.
|
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*/
|
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|
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if (! to_reuse) {
|
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buf = read_sha1_file(entry->sha1, type, &size);
|
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if (!buf)
|
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die("unable to read %s", sha1_to_hex(entry->sha1));
|
||||
if (size != entry->size)
|
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die("object %s size inconsistency (%lu vs %lu)",
|
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sha1_to_hex(entry->sha1), size, entry->size);
|
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if (entry->delta) {
|
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buf = delta_against(buf, size, entry);
|
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size = entry->delta_size;
|
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obj_type = OBJ_DELTA;
|
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}
|
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/*
|
||||
* The object header is a byte of 'type' followed by zero or
|
||||
* more bytes of length. For deltas, the 20 bytes of delta
|
||||
* sha1 follows that.
|
||||
*/
|
||||
hdrlen = encode_header(obj_type, size, header);
|
||||
sha1write(f, header, hdrlen);
|
||||
|
||||
if (entry->delta) {
|
||||
sha1write(f, entry->delta, 20);
|
||||
hdrlen += 20;
|
||||
}
|
||||
datalen = sha1write_compressed(f, buf, size);
|
||||
free(buf);
|
||||
}
|
||||
hdrlen = encode_header(obj_type, size, header);
|
||||
sha1write(f, header, hdrlen);
|
||||
if (entry->delta) {
|
||||
sha1write(f, entry->delta, 20);
|
||||
hdrlen += 20;
|
||||
else {
|
||||
struct packed_git *p = entry->in_pack;
|
||||
use_packed_git(p);
|
||||
|
||||
datalen = find_packed_object_size(p, entry->in_pack_offset);
|
||||
buf = p->pack_base + entry->in_pack_offset;
|
||||
sha1write(f, buf, datalen);
|
||||
unuse_packed_git(p);
|
||||
hdrlen = 0; /* not really */
|
||||
if (obj_type == OBJ_DELTA)
|
||||
reused_delta++;
|
||||
reused++;
|
||||
}
|
||||
datalen = sha1write_compressed(f, buf, size);
|
||||
free(buf);
|
||||
if (obj_type == OBJ_DELTA)
|
||||
written_delta++;
|
||||
written++;
|
||||
return hdrlen + datalen;
|
||||
}
|
||||
|
||||
|
|
@ -132,7 +321,6 @@ static void write_pack_file(void)
|
|||
int i;
|
||||
struct sha1file *f;
|
||||
unsigned long offset;
|
||||
unsigned long mb;
|
||||
struct pack_header hdr;
|
||||
|
||||
if (!base_name)
|
||||
|
|
@ -148,8 +336,6 @@ static void write_pack_file(void)
|
|||
offset = write_one(f, objects + i, offset);
|
||||
|
||||
sha1close(f, pack_file_sha1, 1);
|
||||
mb = offset >> 20;
|
||||
offset &= 0xfffff;
|
||||
}
|
||||
|
||||
static void write_index_file(void)
|
||||
|
|
@ -196,18 +382,20 @@ static int add_object_entry(unsigned char *sha1, unsigned int hash)
|
|||
{
|
||||
unsigned int idx = nr_objects;
|
||||
struct object_entry *entry;
|
||||
struct packed_git *p;
|
||||
unsigned int found_offset = 0;
|
||||
struct packed_git *found_pack = NULL;
|
||||
|
||||
if (incremental || local) {
|
||||
struct packed_git *p;
|
||||
|
||||
for (p = packed_git; p; p = p->next) {
|
||||
struct pack_entry e;
|
||||
|
||||
if (find_pack_entry_one(sha1, &e, p)) {
|
||||
if (incremental)
|
||||
return 0;
|
||||
if (local && !p->pack_local)
|
||||
return 0;
|
||||
for (p = packed_git; p; p = p->next) {
|
||||
struct pack_entry e;
|
||||
if (find_pack_entry_one(sha1, &e, p)) {
|
||||
if (incremental)
|
||||
return 0;
|
||||
if (local && !p->pack_local)
|
||||
return 0;
|
||||
if (!found_pack) {
|
||||
found_offset = e.offset;
|
||||
found_pack = e.p;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -221,39 +409,143 @@ static int add_object_entry(unsigned char *sha1, unsigned int hash)
|
|||
memset(entry, 0, sizeof(*entry));
|
||||
memcpy(entry->sha1, sha1, 20);
|
||||
entry->hash = hash;
|
||||
if (found_pack) {
|
||||
entry->in_pack = found_pack;
|
||||
entry->in_pack_offset = found_offset;
|
||||
}
|
||||
nr_objects = idx+1;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int locate_object_entry_hash(unsigned char *sha1)
|
||||
{
|
||||
int i;
|
||||
unsigned int ui;
|
||||
memcpy(&ui, sha1, sizeof(unsigned int));
|
||||
i = ui % object_ix_hashsz;
|
||||
while (0 < object_ix[i]) {
|
||||
if (!memcmp(sha1, objects[object_ix[i]-1].sha1, 20))
|
||||
return i;
|
||||
if (++i == object_ix_hashsz)
|
||||
i = 0;
|
||||
}
|
||||
return -1 - i;
|
||||
}
|
||||
|
||||
static struct object_entry *locate_object_entry(unsigned char *sha1)
|
||||
{
|
||||
int i = locate_object_entry_hash(sha1);
|
||||
if (0 <= i)
|
||||
return &objects[object_ix[i]-1];
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void check_object(struct object_entry *entry)
|
||||
{
|
||||
char type[20];
|
||||
|
||||
if (!sha1_object_info(entry->sha1, type, &entry->size)) {
|
||||
if (!strcmp(type, "commit")) {
|
||||
entry->type = OBJ_COMMIT;
|
||||
} else if (!strcmp(type, "tree")) {
|
||||
entry->type = OBJ_TREE;
|
||||
} else if (!strcmp(type, "blob")) {
|
||||
entry->type = OBJ_BLOB;
|
||||
} else if (!strcmp(type, "tag")) {
|
||||
entry->type = OBJ_TAG;
|
||||
} else
|
||||
die("unable to pack object %s of type %s",
|
||||
sha1_to_hex(entry->sha1), type);
|
||||
if (entry->in_pack) {
|
||||
unsigned char base[20];
|
||||
unsigned long size;
|
||||
struct object_entry *base_entry;
|
||||
|
||||
/* We want in_pack_type even if we do not reuse delta.
|
||||
* There is no point not reusing non-delta representations.
|
||||
*/
|
||||
check_reuse_pack_delta(entry->in_pack,
|
||||
entry->in_pack_offset,
|
||||
base, &size,
|
||||
&entry->in_pack_type);
|
||||
|
||||
/* Check if it is delta, and the base is also an object
|
||||
* we are going to pack. If so we will reuse the existing
|
||||
* delta.
|
||||
*/
|
||||
if (!no_reuse_delta &&
|
||||
entry->in_pack_type == OBJ_DELTA &&
|
||||
(base_entry = locate_object_entry(base))) {
|
||||
|
||||
/* Depth value does not matter - find_deltas()
|
||||
* will never consider reused delta as the
|
||||
* base object to deltify other objects
|
||||
* against, in order to avoid circular deltas.
|
||||
*/
|
||||
|
||||
/* uncompressed size of the delta data */
|
||||
entry->size = entry->delta_size = size;
|
||||
entry->delta = base_entry;
|
||||
entry->type = OBJ_DELTA;
|
||||
|
||||
entry->delta_sibling = base_entry->delta_child;
|
||||
base_entry->delta_child = entry;
|
||||
|
||||
return;
|
||||
}
|
||||
/* Otherwise we would do the usual */
|
||||
}
|
||||
else
|
||||
|
||||
if (sha1_object_info(entry->sha1, type, &entry->size))
|
||||
die("unable to get type of object %s",
|
||||
sha1_to_hex(entry->sha1));
|
||||
|
||||
if (!strcmp(type, "commit")) {
|
||||
entry->type = OBJ_COMMIT;
|
||||
} else if (!strcmp(type, "tree")) {
|
||||
entry->type = OBJ_TREE;
|
||||
} else if (!strcmp(type, "blob")) {
|
||||
entry->type = OBJ_BLOB;
|
||||
} else if (!strcmp(type, "tag")) {
|
||||
entry->type = OBJ_TAG;
|
||||
} else
|
||||
die("unable to pack object %s of type %s",
|
||||
sha1_to_hex(entry->sha1), type);
|
||||
}
|
||||
|
||||
static void hash_objects(void)
|
||||
{
|
||||
int i;
|
||||
struct object_entry *oe;
|
||||
|
||||
object_ix_hashsz = nr_objects * 2;
|
||||
object_ix = xcalloc(sizeof(int), object_ix_hashsz);
|
||||
for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
|
||||
int ix = locate_object_entry_hash(oe->sha1);
|
||||
if (0 <= ix) {
|
||||
error("the same object '%s' added twice",
|
||||
sha1_to_hex(oe->sha1));
|
||||
continue;
|
||||
}
|
||||
ix = -1 - ix;
|
||||
object_ix[ix] = i + 1;
|
||||
}
|
||||
}
|
||||
|
||||
static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
|
||||
{
|
||||
struct object_entry *child = me->delta_child;
|
||||
unsigned int m = n;
|
||||
while (child) {
|
||||
unsigned int c = check_delta_limit(child, n + 1);
|
||||
if (m < c)
|
||||
m = c;
|
||||
child = child->delta_sibling;
|
||||
}
|
||||
return m;
|
||||
}
|
||||
|
||||
static void get_object_details(void)
|
||||
{
|
||||
int i;
|
||||
struct object_entry *entry = objects;
|
||||
struct object_entry *entry;
|
||||
|
||||
for (i = 0; i < nr_objects; i++)
|
||||
check_object(entry++);
|
||||
hash_objects();
|
||||
prepare_pack_ix();
|
||||
for (i = 0, entry = objects; i < nr_objects; i++, entry++)
|
||||
check_object(entry);
|
||||
for (i = 0, entry = objects; i < nr_objects; i++, entry++)
|
||||
if (!entry->delta && entry->delta_child)
|
||||
entry->delta_limit =
|
||||
check_delta_limit(entry, 1);
|
||||
}
|
||||
|
||||
typedef int (*entry_sort_t)(const struct object_entry *, const struct object_entry *);
|
||||
|
|
@ -326,6 +618,16 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
|
|||
if (cur_entry->type != old_entry->type)
|
||||
return -1;
|
||||
|
||||
/* If the current object is at edge, take the depth the objects
|
||||
* that depend on the current object into account -- otherwise
|
||||
* they would become too deep.
|
||||
*/
|
||||
if (cur_entry->delta_child) {
|
||||
if (max_depth <= cur_entry->delta_limit)
|
||||
return 0;
|
||||
max_depth -= cur_entry->delta_limit;
|
||||
}
|
||||
|
||||
size = cur_entry->size;
|
||||
if (size < 50)
|
||||
return -1;
|
||||
|
|
@ -382,11 +684,19 @@ static void find_deltas(struct object_entry **list, int window, int depth)
|
|||
eye_candy -= nr_objects / 20;
|
||||
fputc('.', stderr);
|
||||
}
|
||||
|
||||
if (entry->delta)
|
||||
/* This happens if we decided to reuse existing
|
||||
* delta from a pack. "!no_reuse_delta &&" is implied.
|
||||
*/
|
||||
continue;
|
||||
|
||||
free(n->data);
|
||||
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) {
|
||||
unsigned int other_idx = idx + j;
|
||||
|
|
@ -411,10 +721,12 @@ static void find_deltas(struct object_entry **list, int window, int depth)
|
|||
|
||||
static void prepare_pack(int window, int depth)
|
||||
{
|
||||
get_object_details();
|
||||
|
||||
if (progress)
|
||||
fprintf(stderr, "Packing %d objects", nr_objects);
|
||||
get_object_details();
|
||||
if (progress)
|
||||
fputc('.', stderr);
|
||||
|
||||
sorted_by_type = create_sorted_list(type_size_sort);
|
||||
if (window && depth)
|
||||
find_deltas(sorted_by_type, window+1, depth);
|
||||
|
|
@ -443,8 +755,9 @@ static int reuse_cached_pack(unsigned char *sha1, int pack_to_stdout)
|
|||
}
|
||||
}
|
||||
|
||||
fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
|
||||
sha1_to_hex(sha1));
|
||||
if (progress)
|
||||
fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
|
||||
sha1_to_hex(sha1));
|
||||
|
||||
if (pack_to_stdout) {
|
||||
if (copy_fd(ifd, 1))
|
||||
|
|
@ -524,6 +837,10 @@ int main(int argc, char **argv)
|
|||
progress = 0;
|
||||
continue;
|
||||
}
|
||||
if (!strcmp("--no-reuse-delta", arg)) {
|
||||
no_reuse_delta = 1;
|
||||
continue;
|
||||
}
|
||||
if (!strcmp("--stdout", arg)) {
|
||||
pack_to_stdout = 1;
|
||||
continue;
|
||||
|
|
@ -599,5 +916,8 @@ int main(int argc, char **argv)
|
|||
puts(sha1_to_hex(object_list_sha1));
|
||||
}
|
||||
}
|
||||
if (progress)
|
||||
fprintf(stderr, "Total %d, written %d (delta %d), reused %d (delta %d)\n",
|
||||
nr_objects, written, written_delta, reused, reused_delta);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
4
pack.h
4
pack.h
|
|
@ -29,5 +29,7 @@ struct pack_header {
|
|||
};
|
||||
|
||||
extern int verify_pack(struct packed_git *, int);
|
||||
|
||||
extern int check_reuse_pack_delta(struct packed_git *, unsigned long,
|
||||
unsigned char *, unsigned long *,
|
||||
enum object_type *);
|
||||
#endif
|
||||
|
|
|
|||
19
sha1_file.c
19
sha1_file.c
|
|
@ -828,6 +828,25 @@ static unsigned long unpack_object_header(struct packed_git *p, unsigned long of
|
|||
return offset;
|
||||
}
|
||||
|
||||
int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
|
||||
unsigned char *base, unsigned long *sizep,
|
||||
enum object_type *kindp)
|
||||
{
|
||||
unsigned long ptr;
|
||||
int status = -1;
|
||||
|
||||
use_packed_git(p);
|
||||
ptr = offset;
|
||||
ptr = unpack_object_header(p, ptr, kindp, sizep);
|
||||
if (*kindp != OBJ_DELTA)
|
||||
goto done;
|
||||
memcpy(base, p->pack_base + ptr, 20);
|
||||
status = 0;
|
||||
done:
|
||||
unuse_packed_git(p);
|
||||
return status;
|
||||
}
|
||||
|
||||
void packed_object_info_detail(struct pack_entry *e,
|
||||
char *type,
|
||||
unsigned long *size,
|
||||
|
|
|
|||
Loading…
Reference in a new issue