From 2c5ef824637cffa574bdce7149791a9cb520595e Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Fri, 2 May 2008 15:11:48 -0400 Subject: [PATCH] pack-objects: clean up write_object() a bit ... for improved readability. No functional changes. Signed-off-by: Nicolas Pitre Signed-off-by: Junio C Hamano --- builtin-pack-objects.c | 64 ++++++++++++++++++++++-------------------- 1 file changed, 33 insertions(+), 31 deletions(-) diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c index b4a63d2468..69ac27788b 100644 --- a/builtin-pack-objects.c +++ b/builtin-pack-objects.c @@ -226,41 +226,43 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry, off_t write_offset) { - unsigned long size; + unsigned long size, limit; void *buf; - unsigned char header[10]; - unsigned char dheader[10]; + unsigned char header[10], dheader[10]; unsigned hdrlen; off_t datalen; - enum object_type obj_type; - int to_reuse = 0; - /* write limit if limited packsize and not first object */ - unsigned long limit = pack_size_limit && nr_written ? - pack_size_limit - write_offset : 0; - /* no if no delta */ - int usable_delta = !entry->delta ? 0 : - /* yes if unlimited packfile */ - !pack_size_limit ? 1 : - /* no if base written to previous pack */ - entry->delta->idx.offset == (off_t)-1 ? 0 : - /* otherwise double-check written to this - * pack, like we do below - */ - entry->delta->idx.offset ? 1 : 0; + enum object_type type; + int usable_delta, to_reuse; if (!pack_to_stdout) crc32_begin(f); - obj_type = entry->type; + type = entry->type; + + /* write limit if limited packsize and not first object */ + limit = pack_size_limit && nr_written ? + pack_size_limit - write_offset : 0; + + if (!entry->delta) + usable_delta = 0; /* no delta */ + else if (!pack_size_limit) + usable_delta = 1; /* unlimited packfile */ + else if (entry->delta->idx.offset == (off_t)-1) + usable_delta = 0; /* base was written to another pack */ + else if (entry->delta->idx.offset) + usable_delta = 1; /* base already exists in this pack */ + else + usable_delta = 0; /* base could end up in another pack */ + if (!reuse_object) to_reuse = 0; /* explicit */ else if (!entry->in_pack) to_reuse = 0; /* can't reuse what we don't have */ - else if (obj_type == OBJ_REF_DELTA || obj_type == OBJ_OFS_DELTA) + else if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA) /* check_object() decided it for us ... */ to_reuse = usable_delta; /* ... but pack split may override that */ - else if (obj_type != entry->in_pack_type) + else if (type != entry->in_pack_type) to_reuse = 0; /* pack has delta which is unusable */ else if (entry->delta) to_reuse = 0; /* we want to pack afresh */ @@ -274,19 +276,19 @@ static unsigned long write_object(struct sha1file *f, unsigned long maxsize; void *out; if (!usable_delta) { - buf = read_sha1_file(entry->idx.sha1, &obj_type, &size); + buf = read_sha1_file(entry->idx.sha1, &type, &size); if (!buf) die("unable to read %s", sha1_to_hex(entry->idx.sha1)); } else if (entry->delta_data) { size = entry->delta_size; buf = entry->delta_data; entry->delta_data = NULL; - obj_type = (allow_ofs_delta && entry->delta->idx.offset) ? + type = (allow_ofs_delta && entry->delta->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; } else { buf = get_delta(entry); size = entry->delta_size; - obj_type = (allow_ofs_delta && entry->delta->idx.offset) ? + type = (allow_ofs_delta && entry->delta->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; } /* compress the data to store and put compressed length in datalen */ @@ -308,9 +310,9 @@ static unsigned long write_object(struct sha1file *f, * The object header is a byte of 'type' followed by zero or * more bytes of length. */ - hdrlen = encode_header(obj_type, size, header); + hdrlen = encode_header(type, size, header); - if (obj_type == OBJ_OFS_DELTA) { + if (type == OBJ_OFS_DELTA) { /* * Deltas with relative base contain an additional * encoding of the relative offset for the delta @@ -329,7 +331,7 @@ static unsigned long write_object(struct sha1file *f, sha1write(f, header, hdrlen); sha1write(f, dheader + pos, sizeof(dheader) - pos); hdrlen += sizeof(dheader) - pos; - } else if (obj_type == OBJ_REF_DELTA) { + } else if (type == OBJ_REF_DELTA) { /* * Deltas with a base reference contain * an additional 20 bytes for the base sha1. @@ -361,11 +363,11 @@ static unsigned long write_object(struct sha1file *f, off_t offset; if (entry->delta) { - obj_type = (allow_ofs_delta && entry->delta->idx.offset) ? + type = (allow_ofs_delta && entry->delta->idx.offset) ? OBJ_OFS_DELTA : OBJ_REF_DELTA; reused_delta++; } - hdrlen = encode_header(obj_type, entry->size, header); + hdrlen = encode_header(type, entry->size, header); offset = entry->in_pack_offset; revidx = find_pack_revindex(p, offset); datalen = revidx[1].offset - offset; @@ -374,7 +376,7 @@ static unsigned long write_object(struct sha1file *f, die("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1)); offset += entry->in_pack_header_size; datalen -= entry->in_pack_header_size; - if (obj_type == OBJ_OFS_DELTA) { + if (type == OBJ_OFS_DELTA) { off_t ofs = entry->idx.offset - entry->delta->idx.offset; unsigned pos = sizeof(dheader) - 1; dheader[pos] = ofs & 127; @@ -385,7 +387,7 @@ static unsigned long write_object(struct sha1file *f, sha1write(f, header, hdrlen); sha1write(f, dheader + pos, sizeof(dheader) - pos); hdrlen += sizeof(dheader) - pos; - } else if (obj_type == OBJ_REF_DELTA) { + } else if (type == OBJ_REF_DELTA) { if (limit && hdrlen + 20 + datalen + 20 >= limit) return 0; sha1write(f, header, hdrlen);