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<?php declare(strict_types=1); namespace Psl\IO; /** * An `IO\Handle` that is readable. */ interface ReadHandleInterface extends HandleInterface { /** * Try to read from the handle immediately, without waiting. * * Up to `$max_bytes` may be allocated in a buffer; large values may lead to * unnecessarily hitting the request memory limit. * * @param ?positive-int $max_bytes the maximum number of bytes to read * * @throws Exception\RuntimeException If an error occurred during the operation. * @throws Exception\AlreadyClosedException If the handle has been already closed. * * @return string the read data on success, or an empty string if the handle is not ready for read, or the end of file is reached. * * @see ReadStreamHandleInterface::read() * @see ReadStreamHandleInterface::readAll() */ public function tryRead(?int $max_bytes = null): string; /** * Read from the handle, waiting for data if necessary. * * @param ?positive-int $max_bytes the maximum number of bytes to read * * @throws Exception\AlreadyClosedException If the handle has been already closed. * @throws Exception\RuntimeException If an error occurred during the operation. * @throws Exception\TimeoutException If $timeout is reached before being able to read from the handle. * * @return string the read data on success, or an empty string if the end of file is reached. * * Up to `$max_bytes` may be allocated in a buffer; large values may lead to * unnecessarily hitting the request memory limit. */ public function read(?int $max_bytes = null, ?float $timeout = null): string; /** * Read until there is no more data to read. * * It is possible for this to never return, e.g. if called on a pipe or * or socket which the other end keeps open forever. Set a timeout if you * do not want this to happen. * * Up to `$max_bytes` may be allocated in a buffer; large values may lead to * unnecessarily hitting the request memory limit. * * @param ?positive-int $max_bytes the maximum number of bytes to read * * @throws Exception\AlreadyClosedException If the handle has been already closed. * @throws Exception\RuntimeException If an error occurred during the operation. * @throws Exception\TimeoutException If $timeout is reached before being able to read from the handle. */ public function readAll(?int $max_bytes = null, ?float $timeout = null): string; /** * Read a fixed amount of data. * * It is possible for this to never return, e.g. if called on a pipe or * or socket which the other end keeps open forever. Set a timeout if you * do not want this to happen. * * @param positive-int $size the number of bytes to read. * * @throws Exception\AlreadyClosedException If the handle has been already closed. * @throws Exception\RuntimeException If an error occurred during the operation. * @throws Exception\TimeoutException If $timeout is reached before being able to read from the handle. */ public function readFixedSize(int $size, ?float $timeout = null): string; }
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