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<?php
declare(strict_types=1);
namespace Nsfisis\Waddiwasi\Stream;
use function assert;
use function chr;
use function fclose;
use function fopen;
use function fread;
use function ord;
use function sprintf;
use function strlen;
final class FileStream implements StreamInterface
{
/**
* @var resource
*/
private readonly mixed $fp;
/**
* @var ?int<0, 255>
*/
private ?int $peekedByte = null;
public function __construct(
private readonly string $path,
) {
$fp = fopen($path, 'rb');
if ($fp === false) {
throw new IoException("Failed to open file: $path");
}
$this->fp = $fp;
}
public function close(): void
{
fclose($this->fp);
}
public function read(int $bytes): string
{
if ($this->peekedByte !== null) {
$first = chr($this->peekedByte);
$this->peekedByte = null;
if ($bytes === 1) {
return $first;
} else {
return $first . $this->doRead($bytes - 1);
}
} else {
return $this->doRead($bytes);
}
}
public function readByte(): int
{
if ($this->peekedByte !== null) {
$ret = $this->peekedByte;
$this->peekedByte = null;
return $ret;
}
return ord($this->doRead(1));
}
public function peekByte(): int
{
if ($this->peekedByte === null) {
$this->peekedByte = ord($this->doRead(1));
}
return $this->peekedByte;
}
public function seek(int $bytes): void
{
$this->read($bytes);
}
public function tell(): int
{
$ret = ftell($this->fp);
if ($ret === false) {
throw new IoException("Failed to get current position in file: $this->path");
}
assert(0 <= $ret);
return $ret;
}
public function eof(): bool
{
// feof() does not work because it returns true only after an
// unsuccessful fread().
if ($this->peekedByte !== null) {
return false;
}
$result = fread($this->fp, 1);
if ($result === false || $result === '') {
return true;
}
$this->peekedByte = ord($result);
return false;
}
/**
* @param positive-int $bytes
*
* @return non-empty-string
*
* @phpstan-impure
*/
private function doRead(int $bytes): string
{
$result = fread($this->fp, $bytes);
if ($result === false) {
throw new IoException("Failed to read from file: $this->path");
}
if (strlen($result) < $bytes) {
throw new UnexpectedEofException(sprintf("Unexpected EOF while reading from file: %s (%d bytes expected, %d bytes read)", $this->path, $bytes, strlen($result)));
}
return $result;
}
}
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