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package net
import (
"errors"
"io"
)
type limitReader struct {
r io.Reader
remaining int
}
// Error returned if the number of bytes read from a LimitReader exceeds the
// limit.
var ErrLimitExceeded = errors.New("reader size limit exceeded")
func (lr *limitReader) Read(b []byte) (int, error) {
n, err := lr.r.Read(b)
lr.remaining = lr.remaining - n
if lr.remaining < 0 {
err = ErrLimitExceeded
}
return n, err
}
// Creates a limit reader. This is similar to io.LimitReader, except that if
// more than limit bytes are read from the stream, an error is returned rather
// than EOF. Thus, accidental truncation of oversized byte streams is avoided
// in favour of a hard error.
//
// Returns ErrLimitExceeded once more than limit bytes are read. The read
// operation still occurs.
func LimitReader(r io.Reader, limit int) io.Reader {
return &limitReader{
r: r,
remaining: limit,
}
}
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