mirror of
https://github.com/octoleo/restic.git
synced 2024-11-19 11:35:14 +00:00
42a3db05b0
internal/repository benchmarks on an Intel i7-3770k: name old speed new speed delta PackerManager-8 209MB/s ± 1% 291MB/s ± 1% +38.94% (p=0.008 n=5+5) SaveAndEncrypt-8 112MB/s ± 1% 135MB/s ± 1% +20.25% (p=0.008 n=5+5)
149 lines
2.8 KiB
Go
149 lines
2.8 KiB
Go
package restic
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import (
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"crypto/rand"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"github.com/restic/restic/internal/errors"
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"github.com/minio/sha256-simd"
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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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return sha256.Sum256(data)
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}
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// idSize contains the size of an ID, in bytes.
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const idSize = sha256.Size
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// ID references content within a repository.
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type ID [idSize]byte
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// ParseID converts the given string to an ID.
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func ParseID(s string) (ID, error) {
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b, err := hex.DecodeString(s)
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if err != nil {
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return ID{}, errors.Wrap(err, "hex.DecodeString")
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}
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if len(b) != idSize {
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return ID{}, errors.New("invalid length for hash")
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}
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id := ID{}
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copy(id[:], b)
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return id, nil
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}
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func (id ID) String() string {
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return hex.EncodeToString(id[:])
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}
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// NewRandomID returns a randomly generated ID. When reading from rand fails,
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// the function panics.
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func NewRandomID() ID {
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id := ID{}
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_, err := io.ReadFull(rand.Reader, id[:])
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if err != nil {
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panic(err)
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}
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return id
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}
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const shortStr = 4
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// Str returns the shortened string version of id.
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func (id *ID) Str() string {
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if id == nil {
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return "[nil]"
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}
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if id.IsNull() {
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return "[null]"
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}
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return hex.EncodeToString(id[:shortStr])
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}
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// IsNull returns true iff id only consists of null bytes.
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func (id ID) IsNull() bool {
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var nullID ID
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return id == nullID
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}
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// Equal compares an ID to another other.
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func (id ID) Equal(other ID) bool {
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return id == other
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}
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// EqualString compares this ID to another one, given as a string.
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func (id ID) EqualString(other string) (bool, error) {
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s, err := hex.DecodeString(other)
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if err != nil {
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return false, errors.Wrap(err, "hex.DecodeString")
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}
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id2 := ID{}
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copy(id2[:], s)
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return id == id2, nil
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}
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// MarshalJSON returns the JSON encoding of id.
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func (id ID) MarshalJSON() ([]byte, error) {
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return json.Marshal(id.String())
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}
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// UnmarshalJSON parses the JSON-encoded data and stores the result in id.
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func (id *ID) UnmarshalJSON(b []byte) error {
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// check string length
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if len(b) < 2 {
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return fmt.Errorf("invalid ID: %q", b)
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}
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if len(b)%2 != 0 {
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return fmt.Errorf("invalid ID length: %q", b)
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}
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// check string delimiters
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if b[0] != '"' && b[0] != '\'' {
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return fmt.Errorf("invalid start of string: %q", b[0])
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}
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last := len(b) - 1
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if b[0] != b[last] {
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return fmt.Errorf("starting string delimiter (%q) does not match end (%q)", b[0], b[last])
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}
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// strip JSON string delimiters
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b = b[1:last]
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if len(b) != 2*len(id) {
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return fmt.Errorf("invalid length for ID")
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}
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_, err := hex.Decode(id[:], b)
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if err != nil {
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return errors.Wrap(err, "hex.Decode")
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}
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return nil
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}
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// IDFromHash returns the ID for the hash.
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func IDFromHash(hash []byte) (id ID) {
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if len(hash) != idSize {
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panic("invalid hash type, not enough/too many bytes")
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}
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copy(id[:], hash)
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return id
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}
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