Example #1
0
File: pack.go Project: jbrukh/ggit
func (p *packIdxParser) parseIdx() *Idx {
	p.idxParser.ConsumeString(PackIdxSignature)
	p.idxParser.ConsumeBytes([]byte{0, 0, 0, PackVersion})
	var counts [256]int
	for i := range counts {
		counts[i] = int(p.idxParser.ParseIntBigEndian(4))
	}
	//discard the fan-out values, just use the largest value,
	//which is the total # of objects:
	count := counts[255]
	idToEntry := make(map[string]*PackedObjectId)
	entries := make([]*PackedObjectId, count, count)
	entriesByOid := make([]*PackedObjectId, count, count)
	for i := 0; i < count; i++ {
		b := p.idxParser.ReadNBytes(20)
		oid, _ := objects.OidFromBytes(b)
		entries[i] = &PackedObjectId{
			ObjectId: oid,
		}
		entriesByOid[i] = entries[i]
	}
	for i := 0; i < count; i++ {
		entries[i].crc32 = int64(p.idxParser.ParseIntBigEndian(4))
	}
	for i := 0; i < count; i++ {
		//TODO: 8-byte #'s for some offsets for some pack files (packs > 2gb)
		entries[i].offset = p.idxParser.ParseIntBigEndian(4)
	}
	checksumPack := p.idxParser.ReadNBytes(20)
	checksumIdx := p.idxParser.ReadNBytes(20)
	if !p.idxParser.EOF() {
		util.PanicErrf("Found extraneous bytes! %x", p.idxParser.Bytes())
	}
	//order by offset
	sort.Sort(packedObjectIds(entries))
	for i, v := range entries {
		v.index = i
	}
	packChecksum, _ := objects.OidFromBytes(checksumPack)
	idxChecksum, _ := objects.OidFromBytes(checksumIdx)
	return &Idx{
		entries,
		entriesByOid,
		idToEntry,
		&counts,
		int64(count),
		packChecksum,
		idxChecksum,
	}
}
Example #2
0
File: pack.go Project: jbrukh/ggit
func readPackedRefDelta(bytes []byte) (delta packedDelta, oid *objects.ObjectId) {
	baseOidBytes := bytes[0:20]
	deltaBytes := bytes[20:]
	delta = packedDelta(deltaBytes)
	oid, _ = objects.OidFromBytes(baseOidBytes)
	return
}
Example #3
0
// ParseOidBytes reads the next objects.OidSize bytes from
// the Reader and generates an ObjectId.
func (p *objectIdParser) ParseOidBytes() *objects.ObjectId {
	b := p.Consume(objects.OidSize)
	oid, e := objects.OidFromBytes(b)
	if e != nil {
		util.PanicErrf("expected: hash bytes %d long", objects.OidSize)
	}
	return oid
}