DataHoarder
4ef60296f1
* Replaced exp/slices and exp/maps with slices/maps implementation * Replaced utils.Min/Max with min/max * Introduced GOEXPERIMENT=loopvar on build steps * Updated tests/docker-compose to go1.21-rc-alpine * Updated nginx to 1.25 * Preallocate mined blocks on Sidechain * Update edwards25519 version
50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package utils
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import "io"
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type ReaderAndByteReader interface {
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io.Reader
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io.ByteReader
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}
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// LimitByteReader returns a Reader that reads from r
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// but stops with EOF after n bytes.
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// The underlying implementation is a *LimitedReader.
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func LimitByteReader(r ReaderAndByteReader, n int64) *LimitedByteReader {
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return &LimitedByteReader{r, n}
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}
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// A LimitedByteReader reads from R but limits the amount of
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// data returned to just N bytes. Each call to Read
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// updates N to reflect the new amount remaining.
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// Read returns EOF when N <= 0 or when the underlying R returns EOF.
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type LimitedByteReader struct {
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R ReaderAndByteReader // underlying reader
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N int64 // max bytes remaining
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}
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func (l *LimitedByteReader) Read(p []byte) (n int, err error) {
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if l.N <= 0 {
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return 0, io.EOF
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}
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if int64(len(p)) > l.N {
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p = p[0:l.N]
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}
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n, err = l.R.Read(p)
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l.N -= int64(n)
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return
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}
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func (l *LimitedByteReader) ReadByte() (v byte, err error) {
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if l.N <= 0 {
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return 0, io.EOF
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}
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v, err = l.R.ReadByte()
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l.N--
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return
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}
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func (l *LimitedByteReader) Left() int64 {
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return l.N
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}
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