42 lines
883 B
Go
42 lines
883 B
Go
package jwe
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import (
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"bytes"
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"compress/flate"
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"io/ioutil"
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"github.com/lestrrat-go/jwx/internal/pool"
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"github.com/lestrrat-go/jwx/jwa"
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"github.com/pkg/errors"
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)
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func uncompress(plaintext []byte) ([]byte, error) {
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return ioutil.ReadAll(flate.NewReader(bytes.NewReader(plaintext)))
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}
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func compress(plaintext []byte, alg jwa.CompressionAlgorithm) ([]byte, error) {
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if alg == jwa.NoCompress {
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return plaintext, nil
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}
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buf := pool.GetBytesBuffer()
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defer pool.ReleaseBytesBuffer(buf)
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w, _ := flate.NewWriter(buf, 1)
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in := plaintext
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for len(in) > 0 {
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n, err := w.Write(in)
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if err != nil {
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return nil, errors.Wrap(err, `failed to write to compression writer`)
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}
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in = in[n:]
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}
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if err := w.Close(); err != nil {
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return nil, errors.Wrap(err, "failed to close compression writer")
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}
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ret := make([]byte, buf.Len())
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copy(ret, buf.Bytes())
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return ret, nil
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}
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