110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
package protocol
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import "io"
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type request struct {
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name string
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offset uint64
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size uint32
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hash []byte
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}
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type header struct {
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version int
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msgID int
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msgType int
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}
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func encodeHeader(h header) uint32 {
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return uint32(h.version&0xf)<<28 +
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uint32(h.msgID&0xfff)<<16 +
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uint32(h.msgType&0xff)<<8
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}
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func decodeHeader(u uint32) header {
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return header{
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version: int(u>>28) & 0xf,
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msgID: int(u>>16) & 0xfff,
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msgType: int(u>>8) & 0xff,
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}
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}
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func (w *marshalWriter) writeHeader(h header) {
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w.writeUint32(encodeHeader(h))
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}
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func (w *marshalWriter) writeIndex(idx []FileInfo) {
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w.writeUint32(uint32(len(idx)))
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for _, f := range idx {
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w.writeString(f.Name)
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w.writeUint32(f.Flags)
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w.writeUint64(uint64(f.Modified))
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w.writeUint32(uint32(len(f.Blocks)))
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for _, b := range f.Blocks {
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w.writeUint32(b.Length)
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w.writeBytes(b.Hash)
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}
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}
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}
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func WriteIndex(w io.Writer, idx []FileInfo) (int, error) {
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mw := marshalWriter{w: w}
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mw.writeIndex(idx)
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return int(mw.getTot()), mw.err
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}
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func (w *marshalWriter) writeRequest(r request) {
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w.writeString(r.name)
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w.writeUint64(r.offset)
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w.writeUint32(r.size)
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w.writeBytes(r.hash)
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}
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func (w *marshalWriter) writeResponse(data []byte) {
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w.writeBytes(data)
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}
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func (r *marshalReader) readHeader() header {
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return decodeHeader(r.readUint32())
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}
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func (r *marshalReader) readIndex() []FileInfo {
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var files []FileInfo
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nfiles := r.readUint32()
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if nfiles > 0 {
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files = make([]FileInfo, nfiles)
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for i := range files {
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files[i].Name = r.readString()
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files[i].Flags = r.readUint32()
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files[i].Modified = int64(r.readUint64())
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nblocks := r.readUint32()
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blocks := make([]BlockInfo, nblocks)
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for j := range blocks {
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blocks[j].Length = r.readUint32()
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blocks[j].Hash = r.readBytes()
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}
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files[i].Blocks = blocks
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}
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}
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return files
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}
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func ReadIndex(r io.Reader) ([]FileInfo, error) {
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mr := marshalReader{r: r}
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idx := mr.readIndex()
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return idx, mr.err
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}
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func (r *marshalReader) readRequest() request {
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var req request
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req.name = r.readString()
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req.offset = r.readUint64()
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req.size = r.readUint32()
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req.hash = r.readBytes()
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return req
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}
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func (r *marshalReader) readResponse() []byte {
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return r.readBytes()
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}
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