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copy.go
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copy.go
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// Copyright ©2019 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rtree
import (
"fmt"
)
// Copy copies from src to dst until either the reader is depleted or
// an error occurs. It returns the number of bytes copied and the first error
// encountered while copying, if any.
func Copy(dst Writer, src *Reader) (int64, error) {
// FIXME(sbinet): optimize for the case(s) where:
// - all branches are being copied
// - compression is the same
// => it might not be needed to uncompress-recompress the baskets.
var (
tot int64
err error
)
wvars := dst.(*wtree).wvars
rvars := make([]ReadVar, len(wvars))
for i, wvar := range wvars {
rvars[i] = ReadVar{
Name: wvar.Name,
Value: wvar.Value,
}
}
orig := src.rvars
defer func() {
src.rvars = orig
src.dirty = true
}()
src.rvars = rvars
src.dirty = true
err = src.Read(func(ctx RCtx) error {
written, err := dst.Write()
if err != nil {
return fmt.Errorf("rtree: could not write entry %d to tree: %w", ctx.Entry, err)
}
tot += int64(written)
return nil
})
if err != nil {
return tot, fmt.Errorf("rtree: could not read through tree: %w", err)
}
return tot, err
}