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fs: Adjust RangeOption.Decode to return -1 for read to end

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A Range request can never request 0 bytes however this change was made
to make a clearer signal that the limit means read to the end.

Add test and more documentation and fixup uses
This commit is contained in:
Nick Craig-Wood
2018-01-27 10:07:17 +00:00
parent 9a73688e3a
commit fe52502f19
7 changed files with 42 additions and 14 deletions
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4
backend/sftp/sftp.go
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@ -855,11 +855,11 @@ func (file *ObjectReader) Close() (err error) {
// Open a remote sftp file object for reading. Seek is supported
func (o *Object) Open(options ...fs.OpenOption) (in io.ReadCloser, err error) {
var offset, limit int64
var offset, limit int64 = 0, -1
for _, option := range options {
switch x := option.(type) {
case *fs.SeekOption:
offset, limit = x.Offset, 0
offset = x.Offset
case *fs.RangeOption:
offset, limit = x.Decode(o.Size())
default: