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reader.go
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reader.go
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package content
import (
"context"
contentapi "github.com/containerd/containerd/api/services/content/v1"
digest "github.com/opencontainers/go-digest"
)
type remoteReader struct {
client contentapi.Content_ReadClient
extra []byte
}
func (rr *remoteReader) Read(p []byte) (n int, err error) {
n += copy(p, rr.extra)
if n >= len(p) {
if n <= len(rr.extra) {
rr.extra = rr.extra[n:]
} else {
rr.extra = rr.extra[:0]
}
return
}
rr.extra = rr.extra[:0]
p = p[n:]
for len(p) > 0 {
var resp *contentapi.ReadContentResponse
// fill our buffer up until we can fill p.
resp, err = rr.client.Recv()
if err != nil {
return
}
copied := copy(p, resp.Data)
n += copied
p = p[copied:]
if len(p) == 0 {
rr.extra = append(rr.extra, resp.Data[copied:]...)
}
}
return
}
func (rr *remoteReader) Close() error {
return rr.client.CloseSend()
}
type remoteReaderAt struct {
ctx context.Context
digest digest.Digest
client contentapi.ContentClient
}
func (ra *remoteReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
rr := &contentapi.ReadContentRequest{
Digest: ra.digest,
Offset: off,
Size_: int64(len(p)),
}
rc, err := ra.client.Read(ra.ctx, rr)
if err != nil {
return 0, err
}
for len(p) > 0 {
var resp *contentapi.ReadContentResponse
// fill our buffer up until we can fill p.
resp, err = rc.Recv()
if err != nil {
return n, err
}
copied := copy(p, resp.Data)
n += copied
p = p[copied:]
}
return n, nil
}