github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/pkg/secio/full_reader.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package secio
    16  
    17  import (
    18  	"io"
    19  )
    20  
    21  // FullReader adapts an io.Reader to never return partial reads with a nil
    22  // error.
    23  type FullReader struct {
    24  	Reader io.Reader
    25  }
    26  
    27  // Read implements io.Reader.Read.
    28  func (r FullReader) Read(dst []byte) (int, error) {
    29  	n, err := io.ReadFull(r.Reader, dst)
    30  	if err == io.ErrUnexpectedEOF {
    31  		return n, io.EOF
    32  	}
    33  	return n, err
    34  }