Re: [boost] [iostreams] array and gzip_decompressor

Subject: Re: [boost] [iostreams] array and gzip_decompressor
From: Chris Hamilton (chamilton_at_[hidden])
Date: 2010-03-01 10:40:28

Ahh... my bad for misreading ;)

Rather than patching things this way, you could always use the
array_source device defined in <boost/iostreams/device/array.hpp>.  A
very simple wrapper can also be written around a std::vector, or you can
use the array_source directly on the internal data of the std::vector.

You then use a filtered_source, and push back the gzip_decompressor
followed by the array_source, like the earlier example in this thread.

Cheers,

Chris

> Thank you eg, Chris,
> 
> But I have probably misled you a bit with my post.
> The gzipped data is actually in memory (inside the storage variable),
> and I wanted to have a gzip_decompressing stream from that.
> 
> for no I am using this patch
> 
> 
> Index: detail/adapter/direct_adapter.hpp
> ===================================================================
> --- detail/adapter/direct_adapter.hpp   (revision 59992)
> +++ detail/adapter/direct_adapter.hpp   (working copy)
> @@ -116,6 +116,7 @@
>      std::streamsize write(const char_type* s, std::streamsize n);
>      std::streampos seek( stream_offset, BOOST_IOS::seekdir,
>                           BOOST_IOS::openmode = BOOST_IOS::in |
> BOOST_IOS::out );
> +    bool putback(const char_type c);
>      void close();
>      void close(BOOST_IOS::openmode which);
>  #ifndef BOOST_IOSTREAMS_NO_LOCALE
> @@ -204,6 +205,18 @@
>  }
> 
>  template<typename Direct>
> +inline bool direct_adapter<Direct>::putback
> +    (const char_type c)
> +{
> +    pointers& get = ptrs_.first();
> +    if( get.ptr == get.beg )
> +        throw bad_putback();
> +    get.ptr -= 1;
> +    *get.ptr = c;
> +    return true;
> +}
> +
> +template<typename Direct>
>  inline std::streamsize direct_adapter<Direct>::write
>      (const char_type* s, std::streamsize n)
>  {
> 
> 
> 
> Nikolay Mladenov
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