mirror of https://github.com/restic/restic.git
85 lines
1.3 KiB
Go
85 lines
1.3 KiB
Go
package backend
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import (
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"bytes"
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"compress/zlib"
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"crypto/sha256"
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"io/ioutil"
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)
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// Each lists all entries of type t in the backend and calls function f() with
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// the id and data.
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func Each(be Server, t Type, f func(id ID, data []byte, err error)) error {
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ids, err := be.List(t)
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if err != nil {
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return err
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}
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for _, id := range ids {
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data, err := be.Get(t, id)
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if err != nil {
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f(id, nil, err)
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continue
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}
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f(id, data, nil)
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}
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return nil
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}
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// Each lists all entries of type t in the backend and calls function f() with
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// the id.
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func EachID(be Server, t Type, f func(ID)) error {
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ids, err := be.List(t)
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if err != nil {
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return err
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}
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for _, id := range ids {
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f(id)
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}
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return nil
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}
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// Compress applies zlib compression to data.
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func Compress(data []byte) []byte {
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// apply zlib compression
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var b bytes.Buffer
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w := zlib.NewWriter(&b)
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_, err := w.Write(data)
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if err != nil {
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panic(err)
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}
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w.Close()
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return b.Bytes()
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}
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// Uncompress reverses zlib compression on data.
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func Uncompress(data []byte) []byte {
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b := bytes.NewBuffer(data)
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r, err := zlib.NewReader(b)
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if err != nil {
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panic(err)
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}
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buf, err := ioutil.ReadAll(r)
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if err != nil {
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panic(err)
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}
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r.Close()
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return buf
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}
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// Hash returns the ID for data.
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func Hash(data []byte) ID {
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h := sha256.Sum256(data)
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id := make(ID, 32)
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copy(id, h[:])
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return id
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}
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