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113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/* Copyright (C) 2002-2005 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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*/
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#include <assert.h>
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#include <rdr/ZlibInStream.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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ZlibInStream::ZlibInStream()
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: underlying(0), zs(NULL), bytesIn(0)
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{
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init();
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}
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ZlibInStream::~ZlibInStream()
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{
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deinit();
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}
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void ZlibInStream::setUnderlying(InStream* is, size_t bytesIn_)
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{
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underlying = is;
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bytesIn = bytesIn_;
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skip(avail());
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}
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void ZlibInStream::flushUnderlying()
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{
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while (bytesIn > 0) {
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if (!check(1))
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throw Exception("ZlibInStream: failed to flush remaining stream data");
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skip(avail());
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}
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setUnderlying(NULL, 0);
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}
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void ZlibInStream::reset()
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{
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deinit();
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init();
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}
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void ZlibInStream::init()
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{
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assert(zs == NULL);
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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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zs->next_in = Z_NULL;
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zs->avail_in = 0;
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if (inflateInit(zs) != Z_OK) {
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delete zs;
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zs = NULL;
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throw Exception("ZlibInStream: inflateInit failed");
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}
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}
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void ZlibInStream::deinit()
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{
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assert(zs != NULL);
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setUnderlying(NULL, 0);
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inflateEnd(zs);
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delete zs;
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zs = NULL;
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}
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bool ZlibInStream::fillBuffer(size_t maxSize, bool wait)
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{
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if (!underlying)
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throw Exception("ZlibInStream overrun: no underlying stream");
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zs->next_out = (U8*)end;
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zs->avail_out = maxSize;
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size_t n = underlying->check(1, wait);
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if (n == 0) return false;
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zs->next_in = (U8*)underlying->getptr();
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zs->avail_in = underlying->avail();
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if (zs->avail_in > bytesIn)
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zs->avail_in = bytesIn;
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int rc = inflate(zs, Z_SYNC_FLUSH);
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if (rc < 0) {
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throw Exception("ZlibInStream: inflate failed");
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}
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bytesIn -= zs->next_in - underlying->getptr();
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end = zs->next_out;
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underlying->setptr(zs->next_in);
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return true;
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}
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