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chunkedreader: disable hash calculation for first segment 

This will produce a slight speedup for small files.
s3-about
Nick Craig-Wood 2019-11-04 10:11:59 +00:00
parent 6150ae89d6
commit c00dcb7e67
1 changed files with 4 additions and 3 deletions
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7
fs/chunkedreader/chunkedreader.go
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@ -7,6 +7,7 @@ import (
"sync"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/hash"
)
// io related errors returned by ChunkedReader
@ -215,12 +216,12 @@ func (cr *ChunkedReader) openRange() error {
var err error
if length <= 0 {
if offset == 0 {
rc, err = cr.o.Open(cr.ctx)
rc, err = cr.o.Open(cr.ctx, &fs.HashesOption{Hashes: hash.Set(hash.None)})
} else {
rc, err = cr.o.Open(cr.ctx, &fs.RangeOption{Start: offset, End: -1})
rc, err = cr.o.Open(cr.ctx, &fs.HashesOption{Hashes: hash.Set(hash.None)}, &fs.RangeOption{Start: offset, End: -1})
}
} else {
rc, err = cr.o.Open(cr.ctx, &fs.RangeOption{Start: offset, End: offset + length - 1})
rc, err = cr.o.Open(cr.ctx, &fs.HashesOption{Hashes: hash.Set(hash.None)}, &fs.RangeOption{Start: offset, End: offset + length - 1})
}
if err != nil {
return err