Hi!
Not sure its incorrect behaviour, but as you can see FFI::cast when applied to FFI\CData with offset returns data different from copy result.
The following code:
$value = FFI::new('char[26]');
FFI::memcpy($value, implode('', range('a', 'z')), 26);
$slice = FFI::new('char[4]');
echo 'cast from start' . PHP_EOL;
FFI::memcpy($slice, $value, 4);
var_dump($value + 0, $slice, FFI::cast('char[4]', $value));
echo PHP_EOL;
echo 'cast with offset' . PHP_EOL;
FFI::memcpy($slice, $value + 4, 4);
var_dump($value + 4, $slice, FFI::cast('char[4]', $value + 4));
echo PHP_EOL;Resulted in this output:
cast from start
object(FFI\CData:char*)#3 (1) {
[0]=>
string(1) "a"
}
object(FFI\CData:char[4])#2 (4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
object(FFI\CData:char[4])#4 (4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
cast with offset
object(FFI\CData:char*)#4 (1) {
[0]=>
string(1) "e"
}
object(FFI\CData:char[4])#2 (4) {
[0]=>
string(1) "e"
[1]=>
string(1) "f"
[2]=>
string(1) "g"
[3]=>
string(1) "h"
}
object(FFI\CData:char[4])#5 (4) {
[0]=>
string(1) "▒"
[1]=>
string(1) "C"
[2]=>
string(1) "▒"
[3]=>
string(1) "x"
}
But I expected this output instead:
cast from start
object(FFI\CData:char*)#3 (1) {
[0]=>
string(1) "a"
}
object(FFI\CData:char[4])#2 (4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
object(FFI\CData:char[4])#4 (4) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
}
cast with offset
object(FFI\CData:char*)#4 (1) {
[0]=>
string(1) "e"
}
object(FFI\CData:char[4])#2 (4) {
[0]=>
string(1) "e"
[1]=>
string(1) "f"
[2]=>
string(1) "g"
[3]=>
string(1) "h"
}
object(FFI\CData:char[4])#5 (4) {
[0]=>
string(1) "e"
[1]=>
string(1) "f"
[2]=>
string(1) "g"
[3]=>
string(1) "h"
}
PHP Version
PHP 8.1.1
Operating System
No response
Hi!
Not sure its incorrect behaviour, but as you can see FFI::cast when applied to FFI\CData with offset returns data different from copy result.
The following code:
Resulted in this output:
But I expected this output instead:
PHP Version
PHP 8.1.1
Operating System
No response