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27 lines
558 B
Go
27 lines
558 B
Go
package moxio
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import (
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"errors"
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"io"
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)
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var ErrLimit = errors.New("input exceeds maximum size") // Returned by LimitReader.
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// LimitReader reads up to Limit bytes, returning an error if more bytes are
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// read. LimitReader can be used to enforce a maximum input length.
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type LimitReader struct {
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R io.Reader
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Limit int64
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}
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// Read reads bytes from the underlying reader.
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func (r *LimitReader) Read(buf []byte) (int, error) {
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n, err := r.R.Read(buf)
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if n > 0 {
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r.Limit -= int64(n)
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if r.Limit < 0 {
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return 0, ErrLimit
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}
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}
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return n, err
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}
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