Re: [protobuf] GZip Stream examples
Well, I have to update the very first value, , after all messages are written. I do not know a priory how many messages will be stored. Therefore, I use fstream::fseekp(0) to move the write pointer before the file is closed and update the value. Of course, the number is written without optimizations with WriteLittleEndian32(...). It does not seem I can do the same with Gzip. The number would be compressed differently depending on its value and therefore may have different length. -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] GZip Stream examples
I don't think there are any problems with having a raw prefix, and just wrapping GZipInputStream around the raw input stream after it's been read, but that sounds pretty messy. It seems easier to just make the whole thing a gzip stream - it can then also be easily read by other tools that use zlib. On Tue, Mar 8, 2011 at 8:09 PM, ksamdev wrote: > Cool, it worked great. > > Can I mix Raw out and Gzip out in the file? > > Say, I'd like to write a raw number (4 bytes) at the beginning of the file > and then add the message through the Gzip stream. Visually, my file would > look like: > > . > > where first - 4 bytes written with raw_out and the rest: > GG - with Gzip Stream. > > Of course, the reading sequence would be: > > 1. read > 2. keep reading the rest G through Gzip Stream. > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To post to this group, send email to protobuf@googlegroups.com. > To unsubscribe from this group, send email to > protobuf+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/protobuf?hl=en. > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] GZip Stream examples
Cool, it worked great. Can I mix Raw out and Gzip out in the file? Say, I'd like to write a raw number (4 bytes) at the beginning of the file and then add the message through the Gzip stream. Visually, my file would look like: . where first - 4 bytes written with raw_out and the rest: GG - with Gzip Stream. Of course, the reading sequence would be: 1. read 2. keep reading the rest G through Gzip Stream. -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] GZip Stream examples
You wrap GZipOutputStream around your underlying output stream, and use the GZipOutputStream with CodedOutputStream instead: On Tue, Mar 8, 2011 at 10:10 AM, ksamdev wrote: > Hi, > > Are there any examples on how to use GzipOUtputStream in ProtoBuf? > I've manages so far combo: > > _raw_out.reset(new > ::google::protobuf::io::OstreamOutputStream(&_output)); > _compressed_out.reset(new ::google::protobuf::io::GZipOutputStream(_raw_out.get())); > _coded_out.reset(new > ::google::protobuf::io::CodedOutputStream(_compressed_out.get())); > > (both objects are boost::shared_pointer's). > > How am I supposed to use the GzipOutputStream here? > > thanks. > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To post to this group, send email to protobuf@googlegroups.com. > To unsubscribe from this group, send email to > protobuf+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/protobuf?hl=en. > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
[protobuf] GZip Stream examples
Hi, Are there any examples on how to use GzipOUtputStream in ProtoBuf? I've manages so far combo: _raw_out.reset(new ::google::protobuf::io::OstreamOutputStream(&_output)); _coded_out.reset(new ::google::protobuf::io::CodedOutputStream(_raw_out.get())); (both objects are boost::shared_pointer's). How am I supposed to use the GzipOutputStream here? thanks. -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
