func (pl *PostingList) ToBytes(dst []byte) {
if cap(dst) < pl.Size() {
panic("dst is too small")
}
writeUInt64(dst, uint64(pl.MaxId))
dst = dst[8:]
written := varint.VarInt(len(pl.Raw)).Write(dst[8:])
dst = dst[written:]
copy(dst, pl.Raw)
}
func (pl *PostingList) Add(doc match.DocId) (err os.Error) {
numBlocks := uint(len(pl.Raw))
if numBlocks > 0 && doc < pl.MaxId {
return os.NewError("doc isn't larger than current max doc")
}
diff := varint.VarInt(doc - pl.MaxId)
size := diff.Size()
if size+numBlocks >= uint(cap(pl.Raw)) {
return os.NewError("Out of space")
}
pl.Raw = pl.Raw[0 : numBlocks+size]
diff.Write(pl.Raw[numBlocks:])
// Set the high bit
pl.Raw[numBlocks] = blockTypeDoc | pl.Raw[numBlocks]
pl.MaxId = doc
return nil
}
func (pl *PostingList) Size() int {
return len(pl.Raw) + int(varint.VarInt(len(pl.Raw)).Size()) + 8
}