42 lines
547 B
V
42 lines
547 B
V
import io
|
|
|
|
struct Buf {
|
|
pub:
|
|
bytes []byte
|
|
mut:
|
|
i int
|
|
}
|
|
|
|
struct Writ {
|
|
pub mut:
|
|
bytes []byte
|
|
}
|
|
|
|
fn (mut b Buf) read(mut buf []byte) ?int {
|
|
if !(b.i < b.bytes.len) {
|
|
return none
|
|
}
|
|
n := copy(buf, b.bytes[b.i..])
|
|
b.i += n
|
|
return n
|
|
}
|
|
|
|
fn (mut w Writ) write(buf []byte) ?int {
|
|
if buf.len <= 0 {
|
|
return none
|
|
}
|
|
w.bytes << buf
|
|
return buf.len
|
|
}
|
|
|
|
fn test_copy() {
|
|
mut src := Buf{
|
|
bytes: 'abcdefghij'.repeat(10).bytes()
|
|
}
|
|
mut dst := Writ{
|
|
bytes: []byte{}
|
|
}
|
|
io.cp(mut src, mut dst) or { assert false }
|
|
assert dst.bytes == src.bytes
|
|
}
|