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//
// HtZlibCodec.cc
//
// HtZlibCodec: Provide a generic access to the zlib compression routines.
// If zlib is not present, encode and decode are simply
// assignment functions.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: HtZlibCodec.cc,v 1.4 2004/05/28 13:15:12 lha Exp $
//
#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif /* HAVE_CONFIG_H */
#include "HtZlibCodec.h"
#include "defaults.h" // For "config"
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
#include <zlib.h>
#endif
HtZlibCodec::HtZlibCodec()
{
}
HtZlibCodec::~HtZlibCodec()
{
}
String HtZlibCodec::encode(const String &str) const
{
String s = str;
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
HtConfiguration* config= HtConfiguration::config();
static int cf=config->Value("compression_level",0);
if (cf) {
//
// Now compress s into c_s
//
unsigned char c_buffer[16384];
String c_s;
z_stream c_stream; /* compression stream */
c_stream.zalloc=(alloc_func)0;
c_stream.zfree=(free_func)0;
c_stream.opaque=(voidpf)0;
// Get compression factor, default to best
if (cf<-1) cf=-1; else if (cf>9) cf=9;
int err=deflateInit(&c_stream,cf);
if (err!=Z_OK) return 0;
int len=s.length();
c_stream.next_in=(Bytef*)(char *)s;
c_stream.avail_in=len;
while (err==Z_OK && c_stream.total_in!=(uLong)len) {
c_stream.next_out=c_buffer;
c_stream.avail_out=sizeof(c_buffer);
err=deflate(&c_stream,Z_NO_FLUSH);
c_s.append((char *)c_buffer,c_stream.next_out-c_buffer);
}
// Finish the stream
for (;;) {
c_stream.next_out=c_buffer;
c_stream.avail_out=sizeof(c_buffer);
err=deflate(&c_stream,Z_FINISH);
c_s.append((char *)c_buffer,c_stream.next_out-c_buffer);
if (err==Z_STREAM_END) break;
//CHECK_ERR(err, "deflate");
}
err=deflateEnd(&c_stream);
s=c_s;
}
#endif // HAVE_LIBZ && HAVE_ZLIB_H
return s;
}
String HtZlibCodec::decode(const String &str) const
{
String s = str;
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
HtConfiguration* config= HtConfiguration::config();
static int cf=config->Value("compression_level",0);
if (cf) {
String c_s;
// Decompress stream
unsigned char c_buffer[16384];
z_stream d_stream;
d_stream.zalloc=(alloc_func)0;
d_stream.zfree=(free_func)0;
d_stream.opaque=(voidpf)0;
unsigned int len=s.length();
d_stream.next_in=(Bytef*)(char *)s;
d_stream.avail_in=len;
int err=inflateInit(&d_stream);
if (err!=Z_OK) return 1;
while (err==Z_OK && d_stream.total_in<len) {
d_stream.next_out=c_buffer;
d_stream.avail_out=sizeof(c_buffer);
err=inflate(&d_stream,Z_NO_FLUSH);
c_s.append((char *)c_buffer,d_stream.next_out-c_buffer);
if (err==Z_STREAM_END) break;
}
err=inflateEnd(&d_stream);
s=c_s;
}
#endif // HAVE_LIBZ && HAVE_ZLIB_H
return s;
}
// Canonical singleton interface.
HtZlibCodec *
HtZlibCodec::instance()
{
static HtZlibCodec *_instance = 0;
if (_instance == 0)
{
_instance = new HtZlibCodec();
}
return _instance;
}
// End of HtZlibCodec.cc
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