141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
//
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// Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This software is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this software; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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#include <rdr/ZlibOutStream.h>
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#include <rdr/Exception.h>
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#include <zlib.h>
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using namespace rdr;
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enum { DEFAULT_BUF_SIZE = 16384 };
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ZlibOutStream::ZlibOutStream(OutStream* os, int bufSize_)
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: underlying(os), bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
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{
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zs = new z_stream;
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zs->zalloc = Z_NULL;
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zs->zfree = Z_NULL;
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zs->opaque = Z_NULL;
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if (deflateInit(zs, Z_DEFAULT_COMPRESSION) != Z_OK) {
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delete zs;
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throw Exception("ZlibOutStream: deflateInit failed");
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}
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ptr = start = new U8[bufSize];
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end = start + bufSize;
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}
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ZlibOutStream::~ZlibOutStream()
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{
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try {
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flush();
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} catch (Exception&) {
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}
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delete [] start;
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deflateEnd(zs);
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delete zs;
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}
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void ZlibOutStream::setUnderlying(OutStream* os)
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{
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underlying = os;
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}
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int ZlibOutStream::length()
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{
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return offset + ptr - start;
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}
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void ZlibOutStream::flush()
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{
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zs->next_in = start;
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zs->avail_in = ptr - start;
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// fprintf(stderr,"zos flush: avail_in %d\n",zs->avail_in);
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while (zs->avail_in != 0) {
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do {
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underlying->check(1);
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zs->next_out = underlying->getptr();
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zs->avail_out = underlying->getend() - underlying->getptr();
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// fprintf(stderr,"zos flush: calling deflate, avail_in %d, avail_out %d\n",
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// zs->avail_in,zs->avail_out);
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int rc = deflate(zs, Z_SYNC_FLUSH);
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if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
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// fprintf(stderr,"zos flush: after deflate: %d bytes\n",
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// zs->next_out-underlying->getptr());
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underlying->setptr(zs->next_out);
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} while (zs->avail_out == 0);
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}
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offset += ptr - start;
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ptr = start;
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}
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int ZlibOutStream::overrun(int itemSize, int nItems)
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{
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// fprintf(stderr,"ZlibOutStream overrun\n");
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if (itemSize > bufSize)
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throw Exception("ZlibOutStream overrun: max itemSize exceeded");
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while (end - ptr < itemSize) {
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zs->next_in = start;
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zs->avail_in = ptr - start;
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do {
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underlying->check(1);
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zs->next_out = underlying->getptr();
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zs->avail_out = underlying->getend() - underlying->getptr();
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// fprintf(stderr,"zos overrun: calling deflate, avail_in %d, avail_out %d\n",
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// zs->avail_in,zs->avail_out);
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int rc = deflate(zs, 0);
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if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
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// fprintf(stderr,"zos overrun: after deflate: %d bytes\n",
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// zs->next_out-underlying->getptr());
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underlying->setptr(zs->next_out);
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} while (zs->avail_out == 0);
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// output buffer not full
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if (zs->avail_in == 0) {
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offset += ptr - start;
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ptr = start;
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} else {
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// but didn't consume all the data? try shifting what's left to the
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// start of the buffer.
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fprintf(stderr,"z out buf not full, but in data not consumed\n");
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memmove(start, zs->next_in, ptr - zs->next_in);
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offset += zs->next_in - start;
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ptr -= zs->next_in - start;
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}
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}
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if (itemSize * nItems > end - ptr)
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nItems = (end - ptr) / itemSize;
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return nItems;
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}
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