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restic/src/restic/readerat.go

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package restic
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import (
"io"
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"restic/debug"
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)
type backendReaderAt struct {
be Backend
h Handle
}
func (brd backendReaderAt) ReadAt(p []byte, offset int64) (n int, err error) {
return ReadAt(brd.be, brd.h, offset, p)
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}
// ReaderAt returns an io.ReaderAt for a file in the backend.
func ReaderAt(be Backend, h Handle) io.ReaderAt {
return backendReaderAt{be: be, h: h}
}
// ReadAt reads from the backend handle h at the given position.
func ReadAt(be Backend, h Handle, offset int64, p []byte) (n int, err error) {
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debug.Log("ReadAt(%v) at %v, len %v", h, offset, len(p))
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rd, err := be.Load(h, len(p), offset)
if err != nil {
return 0, err
}
n, err = io.ReadFull(rd, p)
e := rd.Close()
if err == nil {
err = e
}
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debug.Log("ReadAt(%v) ReadFull returned %v bytes", h, n)
return n, err
}