mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-19 03:25:16 +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
480 lines
13 KiB
Go
480 lines
13 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
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//
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// Copyright 2012 The Go Authors. All rights reserved.
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// https://github.com/golang/protobuf
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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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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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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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// +build appengine
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// This file contains an implementation of proto field accesses using package reflect.
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// It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can
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// be used on App Engine.
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package proto
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import (
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"math"
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"reflect"
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)
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// A structPointer is a pointer to a struct.
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type structPointer struct {
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v reflect.Value
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}
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// toStructPointer returns a structPointer equivalent to the given reflect value.
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// The reflect value must itself be a pointer to a struct.
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func toStructPointer(v reflect.Value) structPointer {
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return structPointer{v}
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}
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// IsNil reports whether p is nil.
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func structPointer_IsNil(p structPointer) bool {
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return p.v.IsNil()
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}
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// Interface returns the struct pointer as an interface value.
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func structPointer_Interface(p structPointer, _ reflect.Type) interface{} {
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return p.v.Interface()
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}
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// A field identifies a field in a struct, accessible from a structPointer.
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// In this implementation, a field is identified by the sequence of field indices
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// passed to reflect's FieldByIndex.
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type field []int
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// toField returns a field equivalent to the given reflect field.
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func toField(f *reflect.StructField) field {
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return f.Index
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}
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// invalidField is an invalid field identifier.
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var invalidField = field(nil)
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// IsValid reports whether the field identifier is valid.
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func (f field) IsValid() bool { return f != nil }
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// field returns the given field in the struct as a reflect value.
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func structPointer_field(p structPointer, f field) reflect.Value {
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// Special case: an extension map entry with a value of type T
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// passes a *T to the struct-handling code with a zero field,
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// expecting that it will be treated as equivalent to *struct{ X T },
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// which has the same memory layout. We have to handle that case
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// specially, because reflect will panic if we call FieldByIndex on a
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// non-struct.
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if f == nil {
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return p.v.Elem()
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}
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return p.v.Elem().FieldByIndex(f)
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}
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// ifield returns the given field in the struct as an interface value.
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func structPointer_ifield(p structPointer, f field) interface{} {
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return structPointer_field(p, f).Addr().Interface()
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}
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// Bytes returns the address of a []byte field in the struct.
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func structPointer_Bytes(p structPointer, f field) *[]byte {
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return structPointer_ifield(p, f).(*[]byte)
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}
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// BytesSlice returns the address of a [][]byte field in the struct.
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func structPointer_BytesSlice(p structPointer, f field) *[][]byte {
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return structPointer_ifield(p, f).(*[][]byte)
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}
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// Bool returns the address of a *bool field in the struct.
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func structPointer_Bool(p structPointer, f field) **bool {
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return structPointer_ifield(p, f).(**bool)
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}
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// BoolVal returns the address of a bool field in the struct.
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func structPointer_BoolVal(p structPointer, f field) *bool {
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return structPointer_ifield(p, f).(*bool)
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}
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// BoolSlice returns the address of a []bool field in the struct.
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func structPointer_BoolSlice(p structPointer, f field) *[]bool {
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return structPointer_ifield(p, f).(*[]bool)
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}
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// String returns the address of a *string field in the struct.
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func structPointer_String(p structPointer, f field) **string {
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return structPointer_ifield(p, f).(**string)
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}
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// StringVal returns the address of a string field in the struct.
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func structPointer_StringVal(p structPointer, f field) *string {
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return structPointer_ifield(p, f).(*string)
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}
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// StringSlice returns the address of a []string field in the struct.
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func structPointer_StringSlice(p structPointer, f field) *[]string {
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return structPointer_ifield(p, f).(*[]string)
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}
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// ExtMap returns the address of an extension map field in the struct.
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func structPointer_ExtMap(p structPointer, f field) *map[int32]Extension {
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return structPointer_ifield(p, f).(*map[int32]Extension)
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}
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// NewAt returns the reflect.Value for a pointer to a field in the struct.
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func structPointer_NewAt(p structPointer, f field, typ reflect.Type) reflect.Value {
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return structPointer_field(p, f).Addr()
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}
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// SetStructPointer writes a *struct field in the struct.
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func structPointer_SetStructPointer(p structPointer, f field, q structPointer) {
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structPointer_field(p, f).Set(q.v)
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}
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// GetStructPointer reads a *struct field in the struct.
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func structPointer_GetStructPointer(p structPointer, f field) structPointer {
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return structPointer{structPointer_field(p, f)}
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}
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// StructPointerSlice the address of a []*struct field in the struct.
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func structPointer_StructPointerSlice(p structPointer, f field) structPointerSlice {
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return structPointerSlice{structPointer_field(p, f)}
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}
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// A structPointerSlice represents the address of a slice of pointers to structs
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// (themselves messages or groups). That is, v.Type() is *[]*struct{...}.
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type structPointerSlice struct {
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v reflect.Value
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}
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func (p structPointerSlice) Len() int { return p.v.Len() }
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func (p structPointerSlice) Index(i int) structPointer { return structPointer{p.v.Index(i)} }
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func (p structPointerSlice) Append(q structPointer) {
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p.v.Set(reflect.Append(p.v, q.v))
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}
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var (
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int32Type = reflect.TypeOf(int32(0))
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uint32Type = reflect.TypeOf(uint32(0))
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float32Type = reflect.TypeOf(float32(0))
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int64Type = reflect.TypeOf(int64(0))
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uint64Type = reflect.TypeOf(uint64(0))
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float64Type = reflect.TypeOf(float64(0))
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)
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// A word32 represents a field of type *int32, *uint32, *float32, or *enum.
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// That is, v.Type() is *int32, *uint32, *float32, or *enum and v is assignable.
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type word32 struct {
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v reflect.Value
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}
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// IsNil reports whether p is nil.
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func word32_IsNil(p word32) bool {
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return p.v.IsNil()
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}
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// Set sets p to point at a newly allocated word with bits set to x.
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func word32_Set(p word32, o *Buffer, x uint32) {
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t := p.v.Type().Elem()
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switch t {
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case int32Type:
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if len(o.int32s) == 0 {
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o.int32s = make([]int32, uint32PoolSize)
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}
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o.int32s[0] = int32(x)
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p.v.Set(reflect.ValueOf(&o.int32s[0]))
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o.int32s = o.int32s[1:]
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return
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case uint32Type:
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if len(o.uint32s) == 0 {
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o.uint32s = make([]uint32, uint32PoolSize)
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}
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o.uint32s[0] = x
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p.v.Set(reflect.ValueOf(&o.uint32s[0]))
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o.uint32s = o.uint32s[1:]
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return
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case float32Type:
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if len(o.float32s) == 0 {
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o.float32s = make([]float32, uint32PoolSize)
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}
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o.float32s[0] = math.Float32frombits(x)
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p.v.Set(reflect.ValueOf(&o.float32s[0]))
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o.float32s = o.float32s[1:]
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return
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}
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// must be enum
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p.v.Set(reflect.New(t))
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p.v.Elem().SetInt(int64(int32(x)))
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}
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// Get gets the bits pointed at by p, as a uint32.
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func word32_Get(p word32) uint32 {
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elem := p.v.Elem()
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32 returns a reference to a *int32, *uint32, *float32, or *enum field in the struct.
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func structPointer_Word32(p structPointer, f field) word32 {
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return word32{structPointer_field(p, f)}
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}
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// A word32Val represents a field of type int32, uint32, float32, or enum.
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// That is, v.Type() is int32, uint32, float32, or enum and v is assignable.
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type word32Val struct {
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v reflect.Value
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}
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// Set sets *p to x.
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func word32Val_Set(p word32Val, x uint32) {
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switch p.v.Type() {
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case int32Type:
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p.v.SetInt(int64(x))
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return
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case uint32Type:
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p.v.SetUint(uint64(x))
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return
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case float32Type:
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p.v.SetFloat(float64(math.Float32frombits(x)))
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return
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}
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// must be enum
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p.v.SetInt(int64(int32(x)))
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}
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// Get gets the bits pointed at by p, as a uint32.
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func word32Val_Get(p word32Val) uint32 {
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elem := p.v
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32Val returns a reference to a int32, uint32, float32, or enum field in the struct.
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func structPointer_Word32Val(p structPointer, f field) word32Val {
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return word32Val{structPointer_field(p, f)}
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}
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// A word32Slice is a slice of 32-bit values.
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// That is, v.Type() is []int32, []uint32, []float32, or []enum.
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type word32Slice struct {
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v reflect.Value
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}
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func (p word32Slice) Append(x uint32) {
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n, m := p.v.Len(), p.v.Cap()
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if n < m {
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p.v.SetLen(n + 1)
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} else {
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t := p.v.Type().Elem()
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p.v.Set(reflect.Append(p.v, reflect.Zero(t)))
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}
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elem := p.v.Index(n)
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switch elem.Kind() {
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case reflect.Int32:
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elem.SetInt(int64(int32(x)))
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case reflect.Uint32:
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elem.SetUint(uint64(x))
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case reflect.Float32:
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elem.SetFloat(float64(math.Float32frombits(x)))
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}
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}
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func (p word32Slice) Len() int {
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return p.v.Len()
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}
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func (p word32Slice) Index(i int) uint32 {
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elem := p.v.Index(i)
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32Slice returns a reference to a []int32, []uint32, []float32, or []enum field in the struct.
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func structPointer_Word32Slice(p structPointer, f field) word32Slice {
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return word32Slice{structPointer_field(p, f)}
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}
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// word64 is like word32 but for 64-bit values.
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type word64 struct {
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v reflect.Value
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}
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func word64_Set(p word64, o *Buffer, x uint64) {
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t := p.v.Type().Elem()
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switch t {
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case int64Type:
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if len(o.int64s) == 0 {
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o.int64s = make([]int64, uint64PoolSize)
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}
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o.int64s[0] = int64(x)
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p.v.Set(reflect.ValueOf(&o.int64s[0]))
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o.int64s = o.int64s[1:]
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return
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case uint64Type:
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if len(o.uint64s) == 0 {
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o.uint64s = make([]uint64, uint64PoolSize)
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}
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o.uint64s[0] = x
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p.v.Set(reflect.ValueOf(&o.uint64s[0]))
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o.uint64s = o.uint64s[1:]
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return
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case float64Type:
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if len(o.float64s) == 0 {
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o.float64s = make([]float64, uint64PoolSize)
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}
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o.float64s[0] = math.Float64frombits(x)
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p.v.Set(reflect.ValueOf(&o.float64s[0]))
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o.float64s = o.float64s[1:]
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return
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}
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panic("unreachable")
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}
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func word64_IsNil(p word64) bool {
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return p.v.IsNil()
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}
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func word64_Get(p word64) uint64 {
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elem := p.v.Elem()
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return elem.Uint()
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case reflect.Float64:
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return math.Float64bits(elem.Float())
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}
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panic("unreachable")
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}
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func structPointer_Word64(p structPointer, f field) word64 {
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return word64{structPointer_field(p, f)}
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}
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// word64Val is like word32Val but for 64-bit values.
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type word64Val struct {
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v reflect.Value
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}
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func word64Val_Set(p word64Val, o *Buffer, x uint64) {
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switch p.v.Type() {
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case int64Type:
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p.v.SetInt(int64(x))
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return
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case uint64Type:
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p.v.SetUint(x)
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return
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case float64Type:
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p.v.SetFloat(math.Float64frombits(x))
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return
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}
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panic("unreachable")
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}
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func word64Val_Get(p word64Val) uint64 {
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elem := p.v
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return elem.Uint()
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case reflect.Float64:
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return math.Float64bits(elem.Float())
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}
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panic("unreachable")
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}
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func structPointer_Word64Val(p structPointer, f field) word64Val {
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return word64Val{structPointer_field(p, f)}
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}
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type word64Slice struct {
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v reflect.Value
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}
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func (p word64Slice) Append(x uint64) {
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n, m := p.v.Len(), p.v.Cap()
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if n < m {
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p.v.SetLen(n + 1)
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} else {
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t := p.v.Type().Elem()
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p.v.Set(reflect.Append(p.v, reflect.Zero(t)))
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}
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elem := p.v.Index(n)
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switch elem.Kind() {
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case reflect.Int64:
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elem.SetInt(int64(int64(x)))
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case reflect.Uint64:
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elem.SetUint(uint64(x))
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case reflect.Float64:
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elem.SetFloat(float64(math.Float64frombits(x)))
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}
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}
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func (p word64Slice) Len() int {
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return p.v.Len()
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}
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func (p word64Slice) Index(i int) uint64 {
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elem := p.v.Index(i)
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return uint64(elem.Uint())
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case reflect.Float64:
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return math.Float64bits(float64(elem.Float()))
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}
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panic("unreachable")
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}
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func structPointer_Word64Slice(p structPointer, f field) word64Slice {
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return word64Slice{structPointer_field(p, f)}
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}
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