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externals/boost/libs/iostreams/src/bzip2.cpp

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+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+// To configure Boost to work with libbz2, see the 
+// installation instructions here:
+// http://boost.org/libs/iostreams/doc/index.html?path=7
+
+// Define BOOST_IOSTREAMS_SOURCE so that <boost/iostreams/detail/config.hpp> 
+// knows that we are building the library (possibly exporting code), rather 
+// than using it (possibly importing code).
+#define BOOST_IOSTREAMS_SOURCE 
+
+#include <boost/throw_exception.hpp>
+#include <boost/iostreams/detail/config/dyn_link.hpp>
+#include <boost/iostreams/filter/bzip2.hpp> 
+#include "bzlib.h"  // Julian Seward's "bzip.h" header.
+                    // To configure Boost to work with libbz2, see the 
+                    // installation instructions here:
+                    // http://boost.org/libs/iostreams/doc/index.html?path=7
+                    
+namespace boost { namespace iostreams {
+
+namespace bzip2 {
+
+                    // Status codes
+
+const int ok                   = BZ_OK;
+const int run_ok               = BZ_RUN_OK;
+const int flush_ok             = BZ_FLUSH_OK;
+const int finish_ok            = BZ_FINISH_OK;
+const int stream_end           = BZ_STREAM_END;
+const int sequence_error       = BZ_SEQUENCE_ERROR;
+const int param_error          = BZ_PARAM_ERROR;
+const int mem_error            = BZ_MEM_ERROR;
+const int data_error           = BZ_DATA_ERROR;
+const int data_error_magic     = BZ_DATA_ERROR_MAGIC;
+const int io_error             = BZ_IO_ERROR;
+const int unexpected_eof       = BZ_UNEXPECTED_EOF;
+const int outbuff_full         = BZ_OUTBUFF_FULL;
+const int config_error         = BZ_CONFIG_ERROR;
+
+                    // Action codes
+
+const int finish               = BZ_FINISH;
+const int run                  = BZ_RUN;
+
+} // End namespace bzip2. 
+
+//------------------Implementation of bzip2_error-----------------------------//
+                    
+bzip2_error::bzip2_error(int error)
+    : BOOST_IOSTREAMS_FAILURE("bzip2 error"), error_(error) 
+    { }
+
+void bzip2_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(int error)
+{
+    switch (error) {
+    case BZ_OK: 
+    case BZ_RUN_OK: 
+    case BZ_FLUSH_OK:
+    case BZ_FINISH_OK:
+    case BZ_STREAM_END:
+        return;
+    case BZ_MEM_ERROR: 
+        boost::throw_exception(std::bad_alloc());
+    default:
+        boost::throw_exception(bzip2_error(error));
+    }
+}
+
+//------------------Implementation of bzip2_base------------------------------//
+
+namespace detail {
+
+bzip2_base::bzip2_base(const bzip2_params& params)
+    : params_(params), stream_(new bz_stream), ready_(false) 
+    { }
+
+bzip2_base::~bzip2_base() { delete static_cast<bz_stream*>(stream_); }
+
+void bzip2_base::before( const char*& src_begin, const char* src_end,
+                         char*& dest_begin, char* dest_end )
+{
+    bz_stream* s = static_cast<bz_stream*>(stream_);
+    s->next_in = const_cast<char*>(src_begin);
+    s->avail_in = static_cast<unsigned>(src_end - src_begin);
+    s->next_out = reinterpret_cast<char*>(dest_begin);
+    s->avail_out= static_cast<unsigned>(dest_end - dest_begin);
+}
+
+void bzip2_base::after(const char*& src_begin, char*& dest_begin)
+{
+    bz_stream* s = static_cast<bz_stream*>(stream_);
+    src_begin = const_cast<char*>(s->next_in);
+    dest_begin = s->next_out;
+}
+
+int bzip2_base::check_end(const char* src_begin, const char* dest_begin)
+{
+    bz_stream* s = static_cast<bz_stream*>(stream_);
+    if( src_begin == s->next_in &&
+        s->avail_in == 0 &&
+        dest_begin == s->next_out) {
+        return bzip2::unexpected_eof;
+    } else {
+        return bzip2::ok;
+    }
+}
+
+int bzip2_base::end(bool compress, std::nothrow_t)
+{
+    if (!ready_) return bzip2::ok;
+    ready_ = false;
+    bz_stream* s = static_cast<bz_stream*>(stream_);
+    return compress ? BZ2_bzCompressEnd(s) :  BZ2_bzDecompressEnd(s);
+}
+
+void bzip2_base::end(bool compress)
+{
+    bzip2_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(
+        end(compress, std::nothrow)
+    );
+}
+
+int bzip2_base::compress(int action)
+{
+    return BZ2_bzCompress(static_cast<bz_stream*>(stream_), action);
+}
+
+int bzip2_base::decompress()
+{
+    return BZ2_bzDecompress(static_cast<bz_stream*>(stream_));
+}
+
+void bzip2_base::do_init
+    ( bool compress, 
+      bzip2::alloc_func /* alloc */, 
+      bzip2::free_func /* free */, 
+      void* derived )
+{
+    bz_stream* s = static_cast<bz_stream*>(stream_);
+
+    // Current interface for customizing memory management 
+    // is non-conforming and has been disabled:
+    //    s->bzalloc = alloc;
+    //    s->bzfree = free;
+        s->bzalloc = 0;
+        s->bzfree = 0;
+    s->opaque = derived;
+    bzip2_error::check BOOST_PREVENT_MACRO_SUBSTITUTION( 
+        compress ?
+            BZ2_bzCompressInit( s,
+                                params_.block_size, 
+                                0, 
+                                params_.work_factor ) :
+            BZ2_bzDecompressInit( s, 
+                                  0, 
+                                  params_.small )
+    );
+    ready_ = true;
+}
+
+} // End namespace detail.
+
+//----------------------------------------------------------------------------//
+
+} } // End namespaces iostreams, boost.