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- /* Copyright (C) 2002-2004 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 <rdr/ZlibOutStream.h>
- #include <rdr/Exception.h>
- #include <zlib.h>
-
- using namespace rdr;
-
- enum { DEFAULT_BUF_SIZE = 16384 };
-
- ZlibOutStream::ZlibOutStream(OutStream* os, int bufSize_, int compressLevel)
- : underlying(os), bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
- {
- zs = new z_stream;
- zs->zalloc = Z_NULL;
- zs->zfree = Z_NULL;
- zs->opaque = Z_NULL;
- if (deflateInit(zs, compressLevel) != Z_OK) {
- delete zs;
- throw Exception("ZlibOutStream: deflateInit failed");
- }
- ptr = start = new U8[bufSize];
- end = start + bufSize;
- }
-
- ZlibOutStream::~ZlibOutStream()
- {
- try {
- flush();
- } catch (Exception&) {
- }
- delete [] start;
- deflateEnd(zs);
- delete zs;
- }
-
- void ZlibOutStream::setUnderlying(OutStream* os)
- {
- underlying = os;
- }
-
- int ZlibOutStream::length()
- {
- return offset + ptr - start;
- }
-
- void ZlibOutStream::flush()
- {
- zs->next_in = start;
- zs->avail_in = ptr - start;
-
- // fprintf(stderr,"zos flush: avail_in %d\n",zs->avail_in);
-
- while (zs->avail_in != 0) {
-
- do {
- underlying->check(1);
- zs->next_out = underlying->getptr();
- zs->avail_out = underlying->getend() - underlying->getptr();
-
- // fprintf(stderr,"zos flush: calling deflate, avail_in %d, avail_out %d\n",
- // zs->avail_in,zs->avail_out);
- int rc = deflate(zs, Z_SYNC_FLUSH);
- if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
-
- // fprintf(stderr,"zos flush: after deflate: %d bytes\n",
- // zs->next_out-underlying->getptr());
-
- underlying->setptr(zs->next_out);
- } while (zs->avail_out == 0);
- }
-
- offset += ptr - start;
- ptr = start;
- }
-
- int ZlibOutStream::overrun(int itemSize, int nItems)
- {
- // fprintf(stderr,"ZlibOutStream overrun\n");
-
- if (itemSize > bufSize)
- throw Exception("ZlibOutStream overrun: max itemSize exceeded");
-
- while (end - ptr < itemSize) {
- zs->next_in = start;
- zs->avail_in = ptr - start;
-
- do {
- underlying->check(1);
- zs->next_out = underlying->getptr();
- zs->avail_out = underlying->getend() - underlying->getptr();
-
- // fprintf(stderr,"zos overrun: calling deflate, avail_in %d, avail_out %d\n",
- // zs->avail_in,zs->avail_out);
-
- int rc = deflate(zs, 0);
- if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
-
- // fprintf(stderr,"zos overrun: after deflate: %d bytes\n",
- // zs->next_out-underlying->getptr());
-
- underlying->setptr(zs->next_out);
- } while (zs->avail_out == 0);
-
- // output buffer not full
-
- if (zs->avail_in == 0) {
- offset += ptr - start;
- ptr = start;
- } else {
- // but didn't consume all the data? try shifting what's left to the
- // start of the buffer.
- fprintf(stderr,"z out buf not full, but in data not consumed\n");
- memmove(start, zs->next_in, ptr - zs->next_in);
- offset += zs->next_in - start;
- ptr -= zs->next_in - start;
- }
- }
-
- if (itemSize * nItems > end - ptr)
- nItems = (end - ptr) / itemSize;
-
- return nItems;
- }
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