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add a couple useful methods #102

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merged 3 commits into from
May 1, 2020
Merged

add a couple useful methods #102

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7d7cb88
add a couple useful methods
whyrusleeping May 1, 2020
266e76d
properly satisfy writerTo interface
whyrusleeping May 1, 2020
628a012
Slightly more documentation comment.
warpfork May 1, 2020
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18 changes: 18 additions & 0 deletions cid.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ import (
"encoding/json"
"errors"
"fmt"
"io"
"strings"

mbase "github.com/multiformats/go-multibase"
Expand Down Expand Up @@ -408,6 +409,23 @@ func (c Cid) Bytes() []byte {
return []byte(c.str)
}

// ByteLen returns the length of the CID in bytes.
// It's equivalent to `len(c.Bytes())`, but works without an allocation,
// and should therefore be preferred.
//
// (See also the WriteTo method for other important operations that work without allocation.)
func (c Cid) ByteLen() int {
return len(c.str)
}

// WriteTo writes the CID bytes to the given writer.
// This method works without incurring any allocation.
//
// (See also the ByteLen method for other important operations that work without allocation.)
func (c Cid) WriteTo(w io.Writer) (int, error) {
return io.WriteString(w, c.str)
}

// MarshalBinary is equivalent to Bytes(). It implements the
// encoding.BinaryMarshaler interface.
func (c Cid) MarshalBinary() ([]byte, error) {
Expand Down