EncodeHeaderAndPayload reads a payload, buffers (and optionally compresses) the payload, then computes the header-data (varint of byte size). And then writes header and payload.
(r io.Reader, w io.Writer, comp Compression)
| 47 | // EncodeHeaderAndPayload reads a payload, buffers (and optionally compresses) the payload, |
| 48 | // then computes the header-data (varint of byte size). And then writes header and payload. |
| 49 | func EncodeHeaderAndPayload(r io.Reader, w io.Writer, comp Compression) error { |
| 50 | var buf payloadBuffer |
| 51 | if _, err := io.Copy(&buf, r); err != nil { |
| 52 | return err |
| 53 | } |
| 54 | if err := buf.OutputSizeVarint(w); err != nil { |
| 55 | return err |
| 56 | } |
| 57 | if comp != nil { |
| 58 | compressedWriter := comp.Compress(&noCloseWriter{w: w}) |
| 59 | defer func() { |
| 60 | _ = compressedWriter.Close() |
| 61 | }() |
| 62 | if _, err := buf.WriteTo(compressedWriter); err != nil { |
| 63 | return err |
| 64 | } |
| 65 | } else if _, err := buf.WriteTo(w); err != nil { |
| 66 | return err |
| 67 | } |
| 68 | return nil |
| 69 | } |
| 70 | |
| 71 | // StreamHeaderAndPayload reads a payload and streams (and optionally compresses) it to the writer. |
| 72 | // To do so, it requires the (uncompressed) payload length to be known in advance. |