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/* Copyright (C) 2021 Nicolas Peugnet <n.peugnet@free.fr>
This file is part of dna-backup.
dna-backup is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
dna-backup 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with dna-backup. If not, see <https://www.gnu.org/licenses/>. */
package repo
import (
"bytes"
"fmt"
"io"
"path/filepath"
)
type Chunk interface {
Reader() io.ReadSeeker
Len() int
}
type IdentifiedChunk interface {
Chunk
GetId() *ChunkId
}
type BufferedChunk interface {
Chunk
Bytes() []byte
}
type RepoChunk interface {
Chunk
SetRepo(r *Repo)
}
type ChunkId struct {
Ver int
Idx uint64
}
func (i *ChunkId) Path(repo string) string {
return filepath.Join(repo, fmt.Sprintf(versionFmt, i.Ver), chunksName, fmt.Sprintf(chunkIdFmt, i.Idx))
}
func NewStoredChunk(repo *Repo, id *ChunkId) *StoredChunk {
return &StoredChunk{repo: repo, Id: id}
}
type StoredChunk struct {
repo *Repo
Id *ChunkId
}
func (c *StoredChunk) GetId() *ChunkId {
return c.Id
}
func (c *StoredChunk) SetRepo(r *Repo) {
c.repo = r
}
func (c *StoredChunk) Reader() io.ReadSeeker {
// log.Printf("Chunk %d: Reading from file\n", c.id)
return c.repo.LoadChunkContent(c.Id)
}
func (c *StoredChunk) Len() int {
return c.repo.chunkSize
}
func NewTempChunk(value []byte) *TempChunk {
return &TempChunk{Value: value}
}
type TempChunk struct {
Value []byte
}
func (c *TempChunk) Reader() io.ReadSeeker {
return bytes.NewReader(c.Value)
}
func (c *TempChunk) Len() int {
return len(c.Value)
}
func (c *TempChunk) Bytes() []byte {
return c.Value
}
func (c *TempChunk) AppendFrom(r io.Reader) {
buff, err := io.ReadAll(r)
if err != nil {
println("Chunk: error appending to temp chunk:", err)
}
c.Value = append(c.Value, buff...)
}
type DeltaChunk struct {
repo *Repo
Source *ChunkId
Patch []byte
Size int
}
func (c *DeltaChunk) SetRepo(r *Repo) {
c.repo = r
}
func (c *DeltaChunk) Reader() io.ReadSeeker {
var buff bytes.Buffer
c.repo.Patcher().Patch(c.repo.LoadChunkContent(c.Source), &buff, bytes.NewReader(c.Patch))
return bytes.NewReader(buff.Bytes())
}
// TODO: Maybe return the size of the patch instead ?
func (c *DeltaChunk) Len() int {
return c.Size
}
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