Created
May 29, 2023 05:36
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| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "log" | |
| "os" | |
| ) | |
| type yvesDecoder struct { | |
| inner io.Reader | |
| } | |
| func NewYvesDecoder(r io.Reader) io.Reader { | |
| return &yvesDecoder{ | |
| inner: r, | |
| } | |
| } | |
| func (d *yvesDecoder) decodeByte(b byte) byte { | |
| return b>>5 | b<<3 | |
| } | |
| func (d *yvesDecoder) Read(buffer []byte) (int, error) { | |
| pc := len(buffer) / 2 | |
| buffer = buffer[:pc*2] | |
| read, err := d.inner.Read(buffer) | |
| for n := 0; n <= read && n <= (pc-1)*2; n += 2 { | |
| buffer[n], buffer[n+1] = d.decodeByte(buffer[n]), d.decodeByte(buffer[n+1]) | |
| if n+1 < read { | |
| buffer[n], buffer[n+1] = buffer[n+1], buffer[n] | |
| } | |
| } | |
| return read, err | |
| } | |
| func handle(err error) { | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| } | |
| func ReadFile(name string) ([]byte, error) { | |
| f, err := os.Open(name) | |
| if err != nil { | |
| return nil, err | |
| } | |
| defer f.Close() | |
| decr := NewYvesDecoder(f) | |
| return ioutil.ReadAll(decr) | |
| } | |
| func main() { | |
| data, err := ReadFile("1.yves") | |
| handle(err) | |
| fmt.Println(string(data)) | |
| } |
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