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vendor/zbateson/stream-decorators/README.md

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+# zbateson/stream-decorators
+
+Psr7 stream decorators for character set conversion and common mail format content encodings.
+
+[![Tests](https://github.com/zbateson/stream-decorators/actions/workflows/tests.yml/badge.svg)](https://github.com/zbateson/stream-decorators/actions/workflows/tests.yml)
+[![Code Coverage](https://scrutinizer-ci.com/g/zbateson/stream-decorators/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/zbateson/stream-decorators/?branch=master)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/zbateson/stream-decorators/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/zbateson/stream-decorators/?branch=master)
+[![Total Downloads](https://poser.pugx.org/zbateson/stream-decorators/downloads)](//packagist.org/packages/zbateson/stream-decorators)
+[![Latest Stable Version](https://poser.pugx.org/zbateson/stream-decorators/v)](//packagist.org/packages/zbateson/stream-decorators)
+
+The goals of this project are to be:
+
+* Well written
+* Standards-compliant but forgiving
+* Tested where possible
+
+To include it for use in your project, please install via composer:
+
+```
+composer require zbateson/stream-decorators
+```
+
+## Php 7 Support Dropped
+
+As of stream-decorators 2.0, support for php 7 has been dropped.
+
+## Requirements
+
+stream-decorators requires PHP 8.0 or newer.  Tested on 8.0, 8.1, 8.2 and 8.3.
+
+## New in 2.0 and 2.1
+
+Support for guzzlehttp/psr7 1.9 dropped, min supported version is 2.0.
+
+zbateson/mb-wrapper has been updated to 2.0 as well, which throws an UnsupportedCharsetException converting from/to an unsupported charset, which changes the behaviour of CharsetStream.
+
+Two new classes are introduced in 2.1, DecoratedCachingStream and a TellZeroStream.
+
+## Usage
+
+```php
+$stream = GuzzleHttp\Psr7\Utils::streamFor($handle);
+$b64Stream = new ZBateson\StreamDecorators\Base64Stream($stream);
+$charsetStream = new ZBateson\StreamDecorators\CharsetStream($b64Stream, 'UTF-32', 'UTF-8');
+
+while (($line = GuzzleHttp\Psr7\Utils::readLine()) !== false) {
+    echo $line, "\r\n";
+}
+
+```
+
+Note that CharsetStream, depending on the target encoding, may return multiple bytes when a single 'char' is read.  If using php's 'fread', this will result in a warning:
+
+'read x bytes more data than requested (xxxx read, xxxx max) - excess data will be lost
+
+This is because the parameter to 'fread' is bytes, and so when CharsetStream returns, say, 4 bytes representing a single UTF-32 character, fread will truncate to the first byte when requesting '1' byte.  It is recommended to **not** convert to a stream handle (with StreamWrapper) for this reason when using CharsetStream.
+
+The library consists of the following Psr\Http\Message\StreamInterface implementations:
+* ZBateson\StreamDecorators\Base64Stream - decodes on read and encodes on write to base64.
+* ZBateson\StreamDecorators\CharsetStream - encodes from $streamCharset to $stringCharset on read, and vice-versa on write.
+* ZBateson\StreamDecorators\ChunkSplitStream - splits written characters into lines of $lineLength long (stream implementation of php's chunk_split).
+* ZBateson\StreamDecorators\DecoratedCachingStream - a caching stream that writes to a decorated stream, and reads from the cached undecorated stream, so for instance a stream could be passed, and decorated with a Base64Stream, and when read, the returned bytes would be base64 encoded.
+* ZBateson\StreamDecorators\NonClosingStream - overrides close() and detach(), and simply unsets the attached stream without closing it.
+* ZBateson\StreamDecorators\PregReplaceFilterStream - calls preg_replace on with passed arguments on every read() call.
+* ZBateson\StreamDecorators\QuotedPrintableStream - decodes on read and encodes on write to quoted-printable.
+* ZBateson\StreamDecorators\SeekingLimitStream - similar to GuzzleHttp's LimitStream, but maintains an internal current read position, seeking to it when read() is called, and seeking back to the wrapped stream's position after reading.
+* ZBateson\StreamDecorators\TellZeroStream - tell() always returns '0' -- used by DecoratedCachingStream to wrap a BufferStream in a CachingStream.  CachingStream calls tell() on its wrapped stream, and BufferStream throws an exception, so TellZeroStream is used to wrap the internal BufferStream to mitigate that.
+* ZBateson\StreamDecorators\UUStream - decodes on read, encodes on write to uu-encoded.
+
+QuotedPrintableStream, Base64Stream and UUStream's constructors take a single argument of a StreamInterface.
+CharsetStreams's constructor also takes $streamCharset and $stringCharset as arguments respectively, ChunkSplitStream
+optionally takes a $lineLength argument (defaults to 76) and a $lineEnding argument (defaults to CRLF).
+PregReplaceFilterStream takes a $pattern argument and a $replacement argument.  SeekingLimitStream takes optional
+$limit and $offset parameters, similar to GuzzleHttp's LimitStream.
+
+## License
+
+BSD licensed - please see [license agreement](https://github.com/zbateson/stream-decorators/blob/master/LICENSE).