[PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
Hello, I'm trying to read some zlib-compressed data from a regular binary file. When I try to attach the zlib compression filter, I am getting an error: something about how the prebuffered data didn't work with the filter and so the filter wasn't added to the filter chain. I looked and found a way to turn off buffering for stream *writes*, but not for stream reads. Can anyone help with ideas for why this isn't working? I posted questions to comp.lang.php and received no response. Thanks Bob -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
On Dec 12, 2007, at 2:31 PM, Richard Lynch wrote: On Wed, December 12, 2007 11:28 am, Bob Sabiston wrote: I'm trying to read some zlib-compressed data from a regular binary file. When I try to attach the zlib compression filter, I am getting an error: something about how the prebuffered data didn't work with the filter and so the filter wasn't added to the filter chain. I looked and found a way to turn off buffering for stream *writes*, but not for stream reads. Can anyone help with ideas for why this isn't working? I posted questions to comp.lang.php and received no response. If all else fails, you could just not use the fancy-pants new stream and filter functions, and just use http://php.net/zlib directly on the file. Sorry Richard for the double mail, I didn't have the list cc'd before... How could I do that? I thought the only way to use zlib in PHP was through the stream functions. It's also possible your zlib file is just plain corrupt, and neither will work... But I am getting the error before I start to read -- it is not a zlib 'file', it is a stretch of data within an ordinary file that has been compressed with zlib. Thanks Bob
Re: [PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
On Dec 12, 2007, at 7:20 PM, Casey wrote: Try gzuncompress(); Correct me if I'm wrong, but isn't gzuncompress used for 'gzip' files? Although they both use the same compression, gzip is specific to files and has header information not present in straight zlib data. And as I've mentioned, this is a normal file, not compressed -- I'm just trying to read and decompress pieces of data within the file, which according to the documentation is something zlib does. I assume that most people use these functions for entire files, but surely someone has used it the other way as well? Thanks for any info. Bob On Dec 12, 2007, at 1:03 PM, Bob Sabiston <[EMAIL PROTECTED]> wrote: On Dec 12, 2007, at 2:31 PM, Richard Lynch wrote: On Wed, December 12, 2007 11:28 am, Bob Sabiston wrote: I'm trying to read some zlib-compressed data from a regular binary file. When I try to attach the zlib compression filter, I am getting an error: something about how the prebuffered data didn't work with the filter and so the filter wasn't added to the filter chain. I looked and found a way to turn off buffering for stream *writes*, but not for stream reads. Can anyone help with ideas for why this isn't working? I posted questions to comp.lang.php and received no response. If all else fails, you could just not use the fancy-pants new stream and filter functions, and just use http://php.net/zlib directly on the file. Sorry Richard for the double mail, I didn't have the list cc'd before... How could I do that? I thought the only way to use zlib in PHP was through the stream functions. It's also possible your zlib file is just plain corrupt, and neither will work... But I am getting the error before I start to read -- it is not a zlib 'file', it is a stretch of data within an ordinary file that has been compressed with zlib. Thanks Bob -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
That isn't going to work. Gzip is used for entire files. Do you
understand what I'm trying to do, or am I misunderstanding you?
Bob
On Dec 13, 2007, at 11:13 PM, Casey wrote:
On Dec 13, 2007 7:44 AM, Bob Sabiston <[EMAIL PROTECTED]> wrote:
On Dec 12, 2007, at 7:20 PM, Casey wrote:
Try gzuncompress();
Correct me if I'm wrong, but isn't gzuncompress used for 'gzip'
files? Although they both use the same compression, gzip is specific
to files and has header information not present in straight zlib
data. And as I've mentioned, this is a normal file, not compressed
--
I'm just trying to read and decompress pieces of data within the
file,
which according to the documentation is something zlib does.
I assume that most people use these functions for entire files, but
surely someone has used it the other way as well?
Thanks for any info.
Bob
Zlib compression is what's used in Gzip. Just try it ;)
$uncompressed = gzuncompress(file_get_contents("binaryfile.ext"));
-Casey
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Re: [PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
Revisiting the Zlib PHP html page, I notice that it says that Zlib in PHP works with uncompressed files, but not with sockets. Could that be my problem? What does it mean to be using sockets? I'm sending this data wirelessly from a handheld device to a server, and I'm using the device API, it might use sockets to connect. If that is preventing Zlib from working, is there any way around that? Could the problem be that I am using the zLib functions on the file pointer obtained in this way: $headerfile = $_FILES['header']['tmp_name']; Is that not a real file or something? Would it work perhaps if I first moved this above file to another place within my directories? I think that $_FILES thing references a temporary file. Sorry if that's a newbie question, I am coming from a C/C++ background and still getting used to $variables having 'fuzzy' types. Thanks, Bob -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] zlib and fopen and stream_filter_append, prebuffer read errors help
Zlib compression is what's used in Gzip. Just try it ;)
$uncompressed = gzuncompress(file_get_contents("binaryfile.ext"));
-Casey
On Dec 14, 2007, at 9:45 AM, Bob Sabiston wrote:
That isn't going to work. Gzip is used for entire files. Do you
understand what I'm trying to do, or am I misunderstanding you?
Bob
Oops -- I'm so sorry! I was wrong thinking that it operated on files.
I'd been reading so much about the file format and how gzip meant
files and zlib meant the core data. I just assumed gzuncompress would
be a file thing.
I should be able to get that to work, thank you.
Bob
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