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util.go
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util.go
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package sys
import (
"bytes"
"io"
"io/fs"
"os"
"time"
)
type MemFile struct {
Name string
Buffer []byte // file content
Mode fs.FileMode // FileInfo.Mode
ModTime time.Time // FileInfo.ModTime
Sys interface{} // FileInfo.Sys
reader io.Reader
}
func (f *MemFile) Stat() (fs.FileInfo, error) {
return &MemFileInfo{name: f.Name, f: f}, nil
}
func (f *MemFile) Read(p []byte) (int, error) {
if f.reader == nil {
f.reader = bytes.NewReader(f.Buffer)
}
return f.reader.Read(p)
}
func (f *MemFile) Write(p []byte) (n int, err error) {
f.Buffer = append(f.Buffer, p...)
return len(p), nil
}
func (f *MemFile) WriteAt(p []byte, offset int64) (n int, err error) {
if offset < 0 || offset > int64(len(f.Buffer)) {
return 0, io.ErrShortWrite
}
copy(f.Buffer[offset:], p)
return len(p), nil
}
func (f *MemFile) InitBuffer(size int) {
f.Buffer = make([]byte, size)
}
func (f *MemFile) Sync() error {
return nil
}
func (f *MemFile) Seek(offset int64, whence int) (ret int64, err error) {
if whence != io.SeekStart {
return 0, os.ErrInvalid
}
switch {
case offset < 0:
return 0, os.ErrInvalid
case offset > int64(len(f.Buffer)):
return 0, io.EOF
default:
f.reader = bytes.NewReader(f.Buffer[offset:])
return offset, nil
}
}
func (f *MemFile) Close() error {
f.reader = nil
return nil
}
type MemFileInfo struct {
name string
f *MemFile
}
func (i *MemFileInfo) Name() string {
return i.name
}
func (i *MemFileInfo) Size() int64 {
return int64(len(i.f.Buffer))
}
func (i *MemFileInfo) Mode() fs.FileMode {
return i.f.Mode
}
func (i *MemFileInfo) Type() fs.FileMode {
return i.f.Mode.Type()
}
func (i *MemFileInfo) ModTime() time.Time {
return i.f.ModTime
}
func (i *MemFileInfo) IsDir() bool {
return i.f.Mode&fs.ModeDir != 0
}
func (i *MemFileInfo) Sys() interface{} {
return i.f.Sys
}
func (i *MemFileInfo) Info() (fs.FileInfo, error) {
return i, nil
}
type MemChanFile struct {
Name string
Buffer chan []byte // file content
Mode fs.FileMode // FileInfo.Mode
ModTime time.Time // FileInfo.ModTime
ChunkWriteSize int // 0 value means no limit
Sys interface{} // FileInfo.Sys
ErrChan chan error
data []byte
}
func (f *MemChanFile) Stat() (fs.FileInfo, error) {
return &MemFileChanInfo{name: f.Name, f: f}, nil
}
func (f *MemChanFile) Read(p []byte) (int, error) {
select {
case err := <-f.ErrChan:
return 0, err
case recieveData, ok := <-f.Buffer:
if !ok {
return 0, io.EOF
}
if len(recieveData) > len(p) {
return 0, io.ErrShortBuffer
}
n := copy(p, recieveData)
return n, nil
}
}
func (f *MemChanFile) Write(p []byte) (n int, err error) {
if f.ChunkWriteSize == 0 {
data := make([]byte, len(p))
copy(data, p)
f.Buffer <- data
} else {
if cap(f.data) == 0 {
f.data = make([]byte, 0, len(p))
}
f.data = append(f.data, p...)
}
return len(p), nil
}
func (f *MemChanFile) Sync() error {
current := 0
for ; current < len(f.data); current += f.ChunkWriteSize {
end := current + f.ChunkWriteSize
if end > len(f.data) {
end = len(f.data)
}
f.Buffer <- f.data[current:end]
}
f.data = nil
return nil
}
func (f *MemChanFile) Seek(offset int64, whence int) (ret int64, err error) {
return 0, nil
}
func (f *MemChanFile) Close() error {
close(f.Buffer)
return nil
}
type MemFileChanInfo struct {
name string
f *MemChanFile
}
func (i *MemFileChanInfo) Name() string {
return i.name
}
func (i *MemFileChanInfo) Size() int64 {
return 0
}
func (i *MemFileChanInfo) Mode() fs.FileMode {
return i.f.Mode
}
func (i *MemFileChanInfo) Type() fs.FileMode {
return i.f.Mode.Type()
}
func (i *MemFileChanInfo) ModTime() time.Time {
return i.f.ModTime
}
func (i *MemFileChanInfo) IsDir() bool {
return i.f.Mode&fs.ModeDir != 0
}
func (i *MemFileChanInfo) Sys() interface{} {
return i.f.Sys
}
func (i *MemFileChanInfo) Info() (fs.FileInfo, error) {
return i, nil
}