forked from mirror/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
3.2 KiB
88 lines
3.2 KiB
// Copyright 2018 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package mru
|
|
|
|
import (
|
|
"github.com/ethereum/go-ethereum/swarm/storage"
|
|
)
|
|
|
|
// updateHeader models the non-payload components of a Resource Update
|
|
type updateHeader struct {
|
|
UpdateLookup // UpdateLookup contains the information required to locate this resource (components of the search key used to find it)
|
|
multihash bool // Whether the data in this Resource Update should be interpreted as multihash
|
|
metaHash []byte // SHA3 hash of the metadata chunk (less ownerAddr). Used to prove ownerhsip of the resource.
|
|
}
|
|
|
|
const metaHashLength = storage.KeyLength
|
|
|
|
// updateLookupLength bytes
|
|
// 1 byte flags (multihash bool for now)
|
|
// 32 bytes metaHash
|
|
const updateHeaderLength = updateLookupLength + 1 + metaHashLength
|
|
|
|
// binaryPut serializes the resource header information into the given slice
|
|
func (h *updateHeader) binaryPut(serializedData []byte) error {
|
|
if len(serializedData) != updateHeaderLength {
|
|
return NewErrorf(ErrInvalidValue, "Incorrect slice size to serialize updateHeaderLength. Expected %d, got %d", updateHeaderLength, len(serializedData))
|
|
}
|
|
if len(h.metaHash) != metaHashLength {
|
|
return NewError(ErrInvalidValue, "updateHeader.binaryPut called without metaHash set")
|
|
}
|
|
if err := h.UpdateLookup.binaryPut(serializedData[:updateLookupLength]); err != nil {
|
|
return err
|
|
}
|
|
cursor := updateLookupLength
|
|
copy(serializedData[cursor:], h.metaHash[:metaHashLength])
|
|
cursor += metaHashLength
|
|
|
|
var flags byte
|
|
if h.multihash {
|
|
flags |= 0x01
|
|
}
|
|
|
|
serializedData[cursor] = flags
|
|
cursor++
|
|
|
|
return nil
|
|
}
|
|
|
|
// binaryLength returns the expected size of this structure when serialized
|
|
func (h *updateHeader) binaryLength() int {
|
|
return updateHeaderLength
|
|
}
|
|
|
|
// binaryGet restores the current updateHeader instance from the information contained in the passed slice
|
|
func (h *updateHeader) binaryGet(serializedData []byte) error {
|
|
if len(serializedData) != updateHeaderLength {
|
|
return NewErrorf(ErrInvalidValue, "Incorrect slice size to read updateHeaderLength. Expected %d, got %d", updateHeaderLength, len(serializedData))
|
|
}
|
|
|
|
if err := h.UpdateLookup.binaryGet(serializedData[:updateLookupLength]); err != nil {
|
|
return err
|
|
}
|
|
cursor := updateLookupLength
|
|
h.metaHash = make([]byte, metaHashLength)
|
|
copy(h.metaHash[:storage.KeyLength], serializedData[cursor:cursor+storage.KeyLength])
|
|
cursor += metaHashLength
|
|
|
|
flags := serializedData[cursor]
|
|
cursor++
|
|
|
|
h.multihash = flags&0x01 != 0
|
|
|
|
return nil
|
|
}
|
|
|