Nicolas PitreAfter experimenting with code to add the ability to encode a delta against part of the deltified file, it turns out that resulting packs are _bigger_ than when this ability is not used. The raw delta output might be smaller, but it doesn't compress as well using gzip with a negative net saving on average.
Said bit would in fact be more useful to allow for encoding the copying of chunks larger than 64KB providing more savings with large files. This will correspond to packs version 3.
While the current code still produces packs version 2, it is made future proof so pack versions 2 and 3 are accepted. Any pack version 2 are compatible with version 3 since the redefined bit was never used before. When enough time has passed, code to use that bit to produce version 3 packs could be added.
Signed-off-by: Nicolas Pitre <nico@cam.org>
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Show changes to 6 files +11 −12
patch-delta.c, pack.h, index-pack.c, pack-check.c, pack-objects.c, unpack-objects.c
diff --git a/patch-delta.c b/patch-delta.c index 98c27be..c0e1311 100644 --- a/patch-delta.c +++ b/patch-delta.c @@ -44,16 +44,15 @@ void *patch_delta(void *src_buf, unsigne cmd = *data++; if (cmd & 0x80) { unsigned long cp_off = 0, cp_size = 0; - const unsigned char *buf; if (cmd & 0x01) cp_off = *data++; if (cmd & 0x02) cp_off |= (*data++ << 8); if (cmd & 0x04) cp_off |= (*data++ << 16); if (cmd & 0x08) cp_off |= (*data++ << 24); if (cmd & 0x10) cp_size = *data++; if (cmd & 0x20) cp_size |= (*data++ << 8); + if (cmd & 0x40) cp_size |= (*data++ << 16); if (cp_size == 0) cp_size = 0x10000; - buf = (cmd & 0x40) ? dst_buf : src_buf; - memcpy(out, buf + cp_off, cp_size); + memcpy(out, src_buf + cp_off, cp_size); out += cp_size; } else { memcpy(out, data, cmd); diff --git a/pack.h b/pack.h index 657deaa..9dafa2b 100644 --- a/pack.h +++ b/pack.h @@ -21,6 +21,7 @@ enum object_type { */ #define PACK_SIGNATURE 0x5041434b /* "PACK" */ #define PACK_VERSION 2 +#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) struct pack_header { unsigned int hdr_signature; unsigned int hdr_version; diff --git a/index-pack.c b/index-pack.c index 541d7bc..babe34b 100644 --- a/index-pack.c +++ b/index-pack.c @@ -68,9 +68,9 @@ static void parse_pack_header(void) hdr = (void *)pack_base; if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) die("packfile '%s' signature mismatch", pack_name); - if (hdr->hdr_version != htonl(PACK_VERSION)) - die("packfile '%s' version %d different from ours %d", - pack_name, ntohl(hdr->hdr_version), PACK_VERSION); + if (!pack_version_ok(hdr->hdr_version)) + die("packfile '%s' version %d unsupported", + pack_name, ntohl(hdr->hdr_version)); nr_objects = ntohl(hdr->hdr_entries); diff --git a/pack-check.c b/pack-check.c index 511f294..67a7ecd 100644 --- a/pack-check.c +++ b/pack-check.c @@ -16,9 +16,9 @@ static int verify_packfile(struct packed hdr = p->pack_base; if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) return error("Packfile %s signature mismatch", p->pack_name); - if (hdr->hdr_version != htonl(PACK_VERSION)) - return error("Packfile version %d different from ours %d", - ntohl(hdr->hdr_version), PACK_VERSION); + if (!pack_version_ok(hdr->hdr_version)) + return error("Packfile version %d unsupported", + ntohl(hdr->hdr_version)); nr_objects = ntohl(hdr->hdr_entries); if (num_packed_objects(p) != nr_objects) return error("Packfile claims to have %d objects, " diff --git a/pack-objects.c b/pack-objects.c diff --git a/unpack-objects.c b/unpack-objects.c index 4b5b5cb..815a1b3 100644 --- a/unpack-objects.c +++ b/unpack-objects.c @@ -246,13 +246,12 @@ static void unpack_all(void) { int i; struct pack_header *hdr = fill(sizeof(struct pack_header)); - unsigned version = ntohl(hdr->hdr_version); unsigned nr_objects = ntohl(hdr->hdr_entries); if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE) die("bad pack file"); - if (version != PACK_VERSION) - die("unable to handle pack file version %d", version); + if (!pack_version_ok(hdr->hdr_version)) + die("unknown pack file version %d", ntohl(hdr->hdr_version)); fprintf(stderr, "Unpacking %d objects\n", nr_objects); use(sizeof(struct pack_header));
