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|
package main
import (
"io"
"os"
"github.com/fxamacker/cbor/v2"
)
type readfile struct {
Path string
Limit int64
Offset int64
}
type readfiledata struct {
Type string
Id int
Contents []byte
}
type readfiledone struct {
Type string
Id int
}
func processReadFile(cmd command, out chan<- []byte) {
file, seekErr := os.Open(cmd.ReadFile.Path)
if seekErr != nil {
sendError(out, cmd, seekErr)
return
}
size, seekErr := file.Seek(0, io.SeekEnd)
if seekErr != nil {
sendError(out, cmd, seekErr)
return
}
_, seekErr = file.Seek(cmd.ReadFile.Offset, 0)
if seekErr != nil {
sendError(out, cmd, seekErr)
return
}
readSize := cmd.ReadFile.Limit
if readSize == -1 {
readSize = size - cmd.ReadFile.Offset
}
for {
toRead := min(readSize, 4096)
contents := make([]byte, toRead)
bytesRead, readErr := file.Read(contents)
if readErr != nil && readErr != io.EOF {
sendError(out, cmd, readErr)
return
}
readSize -= int64(bytesRead)
result, _ := cbor.Marshal(readfiledata{
Type: "readfiledata",
Id: cmd.Id,
Contents: contents,
})
out <- result
if readErr == io.EOF || readSize == 0 {
result, _:= cbor.Marshal(readfiledone{
Type: "readfiledone",
Id: cmd.Id,
})
out <- result
return
}
}
}
|
