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<?php
declare(strict_types=1);
namespace Nsfisis\Waddiwasi\Stream;
use function assert;
use function ord;
use function sprintf;
use function strlen;
use function substr;
/**
* Read-only blob stream.
*/
final class BlobStream implements StreamInterface
{
/**
* @var int<0, max>
*/
private int $pos = 0;
/**
* @var positive-int
*/
private readonly int $len;
/**
* Creates a new blob stream with the given content.
*
* @param non-empty-string $content
* The content of the blob.
*/
public function __construct(
private readonly string $content,
) {
$this->len = strlen($content);
}
public function close(): void
{
}
public function read(int $bytes): string
{
$this->ensureNBytesAvailable($bytes);
$ret = substr($this->content, $this->pos, $bytes);
$this->pos += $bytes;
assert($ret !== '');
return $ret;
}
public function readByte(): int
{
$this->ensureNBytesAvailable(1);
return ord($this->content[$this->pos++]);
}
public function peekByte(): int
{
$this->ensureNBytesAvailable(1);
return ord($this->content[$this->pos]);
}
public function seek(int $bytes): void
{
$this->ensureNBytesAvailable($bytes);
$this->pos += $bytes;
}
/**
* @phpstan-pure
*/
public function tell(): int
{
return $this->pos;
}
/**
* @phpstan-pure
*/
public function eof(): bool
{
return $this->len <= $this->pos;
}
/**
* @param positive-int $bytes
*/
private function ensureNBytesAvailable(int $bytes): void
{
if ($this->len < $this->pos + $bytes) {
throw new UnexpectedEofException(sprintf('Unexpected EOF while reading from blob (%d bytes expected, %d bytes read)', $bytes, $this->len - $this->pos));
}
}
}
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