123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113 |
- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
-
- #include <assert.h>
-
- #include <rdr/ZlibInStream.h>
- #include <rdr/Exception.h>
- #include <zlib.h>
-
- using namespace rdr;
-
- ZlibInStream::ZlibInStream()
- : underlying(0), zs(NULL), bytesIn(0)
- {
- init();
- }
-
- ZlibInStream::~ZlibInStream()
- {
- deinit();
- }
-
- void ZlibInStream::setUnderlying(InStream* is, size_t bytesIn_)
- {
- underlying = is;
- bytesIn = bytesIn_;
- skip(avail());
- }
-
- void ZlibInStream::flushUnderlying()
- {
- while (bytesIn > 0) {
- if (!hasData(1))
- throw Exception("ZlibInStream: failed to flush remaining stream data");
- skip(avail());
- }
-
- setUnderlying(NULL, 0);
- }
-
- void ZlibInStream::reset()
- {
- deinit();
- init();
- }
-
- void ZlibInStream::init()
- {
- assert(zs == NULL);
-
- zs = new z_stream;
- zs->zalloc = Z_NULL;
- zs->zfree = Z_NULL;
- zs->opaque = Z_NULL;
- zs->next_in = Z_NULL;
- zs->avail_in = 0;
- if (inflateInit(zs) != Z_OK) {
- delete zs;
- zs = NULL;
- throw Exception("ZlibInStream: inflateInit failed");
- }
- }
-
- void ZlibInStream::deinit()
- {
- assert(zs != NULL);
- setUnderlying(NULL, 0);
- inflateEnd(zs);
- delete zs;
- zs = NULL;
- }
-
- bool ZlibInStream::fillBuffer(size_t maxSize)
- {
- if (!underlying)
- throw Exception("ZlibInStream overrun: no underlying stream");
-
- zs->next_out = (U8*)end;
- zs->avail_out = maxSize;
-
- if (!underlying->hasData(1))
- return false;
- size_t length = underlying->avail();
- if (length > bytesIn)
- length = bytesIn;
- zs->next_in = (U8*)underlying->getptr(length);
- zs->avail_in = length;
-
- int rc = inflate(zs, Z_SYNC_FLUSH);
- if (rc < 0) {
- throw Exception("ZlibInStream: inflate failed");
- }
-
- bytesIn -= length - zs->avail_in;
- end = zs->next_out;
- underlying->setptr(length - zs->avail_in);
- return true;
- }
|