24 lines
427 B
Go
24 lines
427 B
Go
package missinggo
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import "io"
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type SectionWriter struct {
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w io.WriterAt
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off, len int64
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}
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func NewSectionWriter(w io.WriterAt, off, len int64) *SectionWriter {
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return &SectionWriter{w, off, len}
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}
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func (me *SectionWriter) WriteAt(b []byte, off int64) (n int, err error) {
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if off >= me.len {
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err = io.EOF
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return
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}
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if off+int64(len(b)) > me.len {
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b = b[:me.len-off]
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}
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return me.w.WriteAt(b, me.off+off)
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}
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