55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
/*
|
|
* Copyright 2022 Oleg Borodin <borodin@unix7.org>
|
|
*/
|
|
|
|
package dsrpc
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"fmt"
|
|
)
|
|
|
|
func ReadBytes(reader io.Reader, size int64) ([]byte, error) {
|
|
buffer := make([]byte, size)
|
|
read, err := io.ReadFull(reader, buffer)
|
|
return buffer[0:read], err
|
|
}
|
|
|
|
func CopyBytes(reader io.Reader, writer io.Writer, dataSize int64) (int64, error) {
|
|
var err error
|
|
var bSize int64 = 1024 * 4
|
|
var total int64 = 0
|
|
var remains int64 = dataSize
|
|
buffer := make([]byte, bSize)
|
|
|
|
for {
|
|
if reader == nil {
|
|
return total, errors.New("reader is nil")
|
|
}
|
|
if writer == nil {
|
|
return total, errors.New("writer is nil")
|
|
}
|
|
if remains == 0 {
|
|
return total, err
|
|
}
|
|
if remains < bSize {
|
|
bSize = remains
|
|
}
|
|
received, err := reader.Read(buffer[0:bSize])
|
|
if err != nil {
|
|
return total, fmt.Errorf("read error: %v", err)
|
|
}
|
|
recorded, err := writer.Write(buffer[0:received])
|
|
if err != nil {
|
|
return total, fmt.Errorf("write error: %v", err)
|
|
}
|
|
if recorded != received {
|
|
return total, errors.New("size mismatch")
|
|
}
|
|
total += int64(recorded)
|
|
remains -= int64(recorded)
|
|
}
|
|
return total, err
|
|
}
|