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<?php
namespace GuzzleHttp\Stream;
use GuzzleHttp\Stream\Exception\SeekException;
/**
* Static utility class because PHP's autoloaders don't support the concept
* of namespaced function autoloading.
*/
class Utils
{
/**
* Safely opens a PHP stream resource using a filename.
*
* When fopen fails, PHP normally raises a warning. This function adds an
* error handler that checks for errors and throws an exception instead.
*
* @param string $filename File to open
* @param string $mode Mode used to open the file
*
* @return resource
* @throws \RuntimeException if the file cannot be opened
*/
public static function open($filename, $mode)
{
$ex = null;
set_error_handler(function () use ($filename, $mode, &$ex) {
$ex = new \RuntimeException(sprintf(
'Unable to open %s using mode %s: %s',
$filename,
$mode,
func_get_args()[1]
));
});
$handle = fopen($filename, $mode);
restore_error_handler();
if ($ex) {
/** @var $ex \RuntimeException */
throw $ex;
}
return $handle;
}
/**
* Copy the contents of a stream into a string until the given number of
* bytes have been read.
*
* @param StreamInterface $stream Stream to read
* @param int $maxLen Maximum number of bytes to read. Pass -1
* to read the entire stream.
* @return string
*/
public static function copyToString(StreamInterface $stream, $maxLen = -1)
{
$buffer = '';
if ($maxLen === -1) {
while (!$stream->eof()) {
$buf = $stream->read(1048576);
if ($buf === false) {
break;
}
$buffer .= $buf;
}
return $buffer;
}
$len = 0;
while (!$stream->eof() && $len < $maxLen) {
$buf = $stream->read($maxLen - $len);
if ($buf === false) {
break;
}
$buffer .= $buf;
$len = strlen($buffer);
}
return $buffer;
}
/**
* Copy the contents of a stream into another stream until the given number
* of bytes have been read.
*
* @param StreamInterface $source Stream to read from
* @param StreamInterface $dest Stream to write to
* @param int $maxLen Maximum number of bytes to read. Pass -1
* to read the entire stream.
*/
public static function copyToStream(
StreamInterface $source,
StreamInterface $dest,
$maxLen = -1
) {
if ($maxLen === -1) {
while (!$source->eof()) {
if (!$dest->write($source->read(1048576))) {
break;
}
}
return;
}
$bytes = 0;
while (!$source->eof()) {
$buf = $source->read($maxLen - $bytes);
if (!($len = strlen($buf))) {
break;
}
$bytes += $len;
$dest->write($buf);
if ($bytes == $maxLen) {
break;
}
}
}
/**
* Calculate a hash of a Stream
*
* @param StreamInterface $stream Stream to calculate the hash for
* @param string $algo Hash algorithm (e.g. md5, crc32, etc)
* @param bool $rawOutput Whether or not to use raw output
*
* @return string Returns the hash of the stream
* @throws SeekException
*/
public static function hash(
StreamInterface $stream,
$algo,
$rawOutput = false
) {
$pos = $stream->tell();
if ($pos > 0 && !$stream->seek(0)) {
throw new SeekException($stream);
}
$ctx = hash_init($algo);
while (!$stream->eof()) {
hash_update($ctx, $stream->read(1048576));
}
$out = hash_final($ctx, (bool) $rawOutput);
$stream->seek($pos);
return $out;
}
/**
* Read a line from the stream up to the maximum allowed buffer length
*
* @param StreamInterface $stream Stream to read from
* @param int $maxLength Maximum buffer length
*
* @return string|bool
*/
public static function readline(StreamInterface $stream, $maxLength = null)
{
$buffer = '';
$size = 0;
while (!$stream->eof()) {
if (false === ($byte = $stream->read(1))) {
return $buffer;
}
$buffer .= $byte;
// Break when a new line is found or the max length - 1 is reached
if ($byte == PHP_EOL || ++$size == $maxLength - 1) {
break;
}
}
return $buffer;
}
/**
* Alias of GuzzleHttp\Stream\Stream::factory.
*
* @param mixed $resource Resource to create
* @param array $options Associative array of stream options defined in
* {@see \GuzzleHttp\Stream\Stream::__construct}
*
* @return StreamInterface
*
* @see GuzzleHttp\Stream\Stream::factory
* @see GuzzleHttp\Stream\Stream::__construct
*/
public static function create($resource, array $options = [])
{
return Stream::factory($resource, $options);
}
}
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