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file.go
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file.go
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package rio
import (
cryptorand "crypto/rand"
"io"
"os"
"sync/atomic"
)
type (
fileReadedlen64 struct {
readed int64
f *os.File
}
rdReadedlen64 struct {
readed int64
size int64
rd io.Reader
}
)
// NewFileReaderLen64 *os.File 实现 ReadedLen64 接口
func NewFileReaderLen64(f *os.File) ReaderLen64 {
if f == nil {
return nil
}
return &fileReadedlen64{
f: f,
}
}
// NewFileReaderAtLen64 *os.File 实现 ReaderAtLen64 接口
func NewFileReaderAtLen64(f *os.File) ReaderAtLen64 {
if f == nil {
return nil
}
return &fileReadedlen64{
f: f,
}
}
func NewCryptoRandReaderAtLen64(size int64) ReaderAtLen64 {
return &rdReadedlen64{
rd: cryptorand.Reader,
size: size,
}
}
// Read 读文件, 并记录已读取数据量
func (fr *fileReadedlen64) Read(b []byte) (n int, err error) {
n, err = fr.f.Read(b)
atomic.AddInt64(&fr.readed, int64(n))
return n, err
}
// ReadAt 读文件, 不记录已读取数据量
func (fr *fileReadedlen64) ReadAt(b []byte, off int64) (n int, err error) {
n, err = fr.f.ReadAt(b, off)
return n, err
}
// Len 返回文件的大小
func (fr *fileReadedlen64) Len() int64 {
info, err := fr.f.Stat()
if err != nil {
return 0
}
return info.Size() - fr.readed
}
func (rr *rdReadedlen64) Read(b []byte) (n int, err error) {
n, err = rr.ReadAt(b, 0)
atomic.AddInt64(&rr.readed, int64(n))
return n, err
}
func (rr *rdReadedlen64) ReadAt(b []byte, off int64) (n int, err error) {
n, err = rr.rd.Read(b)
return n, err
}
func (rr *rdReadedlen64) Len() int64 {
return rr.size - rr.readed
}