mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-13 00:36:28 +00:00
fa0101bd60
This changes the BEP protocol to use protocol buffer serialization instead of XDR, and therefore also the database format. The local discovery protocol is also updated to be protocol buffer format. GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3276 LGTM: AudriusButkevicius
237 lines
6.2 KiB
Go
237 lines
6.2 KiB
Go
// Copyright (c) 2013, Vastech SA (PTY) LTD. All rights reserved.
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// http://github.com/gogo/protobuf/gogoproto
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package proto
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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"sort"
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"strings"
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)
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func GetBoolExtension(pb extendableProto, extension *ExtensionDesc, ifnotset bool) bool {
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if reflect.ValueOf(pb).IsNil() {
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return ifnotset
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}
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value, err := GetExtension(pb, extension)
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if err != nil {
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return ifnotset
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}
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if value == nil {
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return ifnotset
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}
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if value.(*bool) == nil {
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return ifnotset
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}
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return *(value.(*bool))
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}
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func (this *Extension) Equal(that *Extension) bool {
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return bytes.Equal(this.enc, that.enc)
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}
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func (this *Extension) Compare(that *Extension) int {
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return bytes.Compare(this.enc, that.enc)
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}
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func SizeOfExtensionMap(m map[int32]Extension) (n int) {
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return sizeExtensionMap(m)
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}
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type sortableMapElem struct {
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field int32
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ext Extension
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}
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func newSortableExtensionsFromMap(m map[int32]Extension) sortableExtensions {
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s := make(sortableExtensions, 0, len(m))
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for k, v := range m {
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s = append(s, &sortableMapElem{field: k, ext: v})
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}
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return s
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}
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type sortableExtensions []*sortableMapElem
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func (this sortableExtensions) Len() int { return len(this) }
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func (this sortableExtensions) Swap(i, j int) { this[i], this[j] = this[j], this[i] }
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func (this sortableExtensions) Less(i, j int) bool { return this[i].field < this[j].field }
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func (this sortableExtensions) String() string {
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sort.Sort(this)
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ss := make([]string, len(this))
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for i := range this {
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ss[i] = fmt.Sprintf("%d: %v", this[i].field, this[i].ext)
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}
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return "map[" + strings.Join(ss, ",") + "]"
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}
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func StringFromExtensionsMap(m map[int32]Extension) string {
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return newSortableExtensionsFromMap(m).String()
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}
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func StringFromExtensionsBytes(ext []byte) string {
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m, err := BytesToExtensionsMap(ext)
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if err != nil {
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panic(err)
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}
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return StringFromExtensionsMap(m)
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}
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func EncodeExtensionMap(m map[int32]Extension, data []byte) (n int, err error) {
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if err := encodeExtensionMap(m); err != nil {
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return 0, err
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}
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keys := make([]int, 0, len(m))
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for k := range m {
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keys = append(keys, int(k))
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}
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sort.Ints(keys)
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for _, k := range keys {
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n += copy(data[n:], m[int32(k)].enc)
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}
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return n, nil
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}
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func GetRawExtension(m map[int32]Extension, id int32) ([]byte, error) {
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if m[id].value == nil || m[id].desc == nil {
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return m[id].enc, nil
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}
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if err := encodeExtensionMap(m); err != nil {
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return nil, err
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}
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return m[id].enc, nil
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}
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func size(buf []byte, wire int) (int, error) {
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switch wire {
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case WireVarint:
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_, n := DecodeVarint(buf)
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return n, nil
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case WireFixed64:
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return 8, nil
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case WireBytes:
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v, n := DecodeVarint(buf)
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return int(v) + n, nil
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case WireFixed32:
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return 4, nil
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case WireStartGroup:
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offset := 0
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for {
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u, n := DecodeVarint(buf[offset:])
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fwire := int(u & 0x7)
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offset += n
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if fwire == WireEndGroup {
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return offset, nil
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}
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s, err := size(buf[offset:], wire)
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if err != nil {
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return 0, err
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}
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offset += s
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}
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}
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return 0, fmt.Errorf("proto: can't get size for unknown wire type %d", wire)
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}
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func BytesToExtensionsMap(buf []byte) (map[int32]Extension, error) {
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m := make(map[int32]Extension)
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i := 0
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for i < len(buf) {
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tag, n := DecodeVarint(buf[i:])
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if n <= 0 {
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return nil, fmt.Errorf("unable to decode varint")
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}
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fieldNum := int32(tag >> 3)
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wireType := int(tag & 0x7)
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l, err := size(buf[i+n:], wireType)
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if err != nil {
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return nil, err
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}
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end := i + int(l) + n
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m[int32(fieldNum)] = Extension{enc: buf[i:end]}
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i = end
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}
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return m, nil
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}
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func NewExtension(e []byte) Extension {
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ee := Extension{enc: make([]byte, len(e))}
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copy(ee.enc, e)
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return ee
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}
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func AppendExtension(e extendableProto, tag int32, buf []byte) {
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if ee, eok := e.(extensionsMap); eok {
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ext := ee.ExtensionMap()[int32(tag)] // may be missing
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ext.enc = append(ext.enc, buf...)
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ee.ExtensionMap()[int32(tag)] = ext
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} else if ee, eok := e.(extensionsBytes); eok {
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ext := ee.GetExtensions()
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*ext = append(*ext, buf...)
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}
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}
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func (this Extension) GoString() string {
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if this.enc == nil {
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if err := encodeExtension(&this); err != nil {
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panic(err)
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}
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}
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return fmt.Sprintf("proto.NewExtension(%#v)", this.enc)
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}
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func SetUnsafeExtension(pb extendableProto, fieldNum int32, value interface{}) error {
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typ := reflect.TypeOf(pb).Elem()
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ext, ok := extensionMaps[typ]
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if !ok {
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return fmt.Errorf("proto: bad extended type; %s is not extendable", typ.String())
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}
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desc, ok := ext[fieldNum]
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if !ok {
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return errors.New("proto: bad extension number; not in declared ranges")
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}
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return setExtension(pb, desc, value)
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}
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func GetUnsafeExtension(pb extendableProto, fieldNum int32) (interface{}, error) {
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typ := reflect.TypeOf(pb).Elem()
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ext, ok := extensionMaps[typ]
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if !ok {
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return nil, fmt.Errorf("proto: bad extended type; %s is not extendable", typ.String())
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}
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desc, ok := ext[fieldNum]
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if !ok {
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return nil, fmt.Errorf("unregistered field number %d", fieldNum)
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}
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return GetExtension(pb, desc)
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}
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