(ws) add gzip and gunzip ws sub commands

ixwebsocket/IXHttpServer.cpp

@@ -6,6 +6,7 @@
 
 #include "IXHttpServer.h"
 
+#include "IXGzipCodec.h"
 #include "IXNetSystem.h"
 #include "IXSocketConnect.h"
 #include "IXUserAgent.h"
@@ -14,10 +15,6 @@
 #include <sstream>
 #include <vector>
 
-#ifdef IXWEBSOCKET_USE_ZLIB
-#include <zlib.h>
-#endif
-
 namespace
 {
     std::pair<bool, std::vector<uint8_t>> load(const std::string& path)
@@ -43,51 +40,6 @@ namespace
         auto vec = res.second;
         return std::make_pair(res.first, std::string(vec.begin(), vec.end()));
     }
-
-#ifdef IXWEBSOCKET_USE_ZLIB
-    std::string gzipCompress(const std::string& str)
-    {
-        z_stream zs; // z_stream is zlib's control structure
-        memset(&zs, 0, sizeof(zs));
-
-        // deflateInit2 configure the file format: request gzip instead of deflate
-        const int windowBits = 15;
-        const int GZIP_ENCODING = 16;
-
-        deflateInit2(&zs,
-                     Z_DEFAULT_COMPRESSION,
-                     Z_DEFLATED,
-                     windowBits | GZIP_ENCODING,
-                     8,
-                     Z_DEFAULT_STRATEGY);
-
-        zs.next_in = (Bytef*) str.data();
-        zs.avail_in = (uInt) str.size(); // set the z_stream's input
-
-        int ret;
-        char outbuffer[32768];
-        std::string outstring;
-
-        // retrieve the compressed bytes blockwise
-        do
-        {
-            zs.next_out = reinterpret_cast<Bytef*>(outbuffer);
-            zs.avail_out = sizeof(outbuffer);
-
-            ret = deflate(&zs, Z_FINISH);
-
-            if (outstring.size() < zs.total_out)
-            {
-                // append the block to the output string
-                outstring.append(outbuffer, zs.total_out - outstring.size());
-            }
-        } while (ret == Z_OK);
-
-        deflateEnd(&zs);
-
-        return outstring;
-    }
-#endif
 } // namespace
 
 namespace ix