Stream chunk size

Hi everyone, I have a question about streams and the maximum ‘chunk size’ of 8192. I’ve read README.STREAMS and found these slides by Wez: http://netevil.org/blog/2008/07/slides-php-streams While trying to write an Amazon S3 stream wrapper and I ran into an issue with large files: $fp = fopen('s3://mvtest/large.html', 'r'); // 30 mb // This is OK fseek($fp, 10); echo fread($fp, 100) . "\n"; // 100 bytes echo fread($fp, 100) . "\n"; // 100 bytes // This is OK (according to documentation, max 8192 bytes) echo fread($fp, 65536) . "\n"; // 8192 bytes My issue is I would like to request larger ‘chunks’, something like: stream_set_chunk_size($fp, 65536); echo fread($fp, 65536) . "\n"; // 65536 bytes echo fread($fp, 100000) . "\n"; // 65536 bytes echo fread($fp, 15) . "\n"; // 15 bytes Then copying to a file and avoiding memory issues: $wfp = fopen(‘/tmp/large.html’); stream_copy_to_stream($fp, $wfp); // read 65536 byte chunks, write default 8192 byte chunks stream_set_chunk_size($wfp, 65536); stream_copy_to_stream($fp, $wfp); // read & write 65536 byte chunks copy('s3://mvtest/large.html', '/tmp/large.html'); // read & write default 8192 byte chunks Going through the PHP 5.2 source, it looks like there’s support for it but at some places the 8192 ‘chunk’ is hardcoded: #define CHUNK_SIZE 8192 PHPAPI size_t _php_stream_copy_to_stream(php_stream *src, php_stream *dest, size_t maxlen STREAMS_DC TSRMLS_DC) { char buf[CHUNK_SIZE]; ß Is there any reason the php_stream *src->chunk_size isn’t used? stream_set_chunk_size($fp, 65536); // Would mean src->chunk_size = 65536; I’d like to try to write a patch for it, anything that I should know about streams and why the limit is there?