143 lines
3.6 KiB
C++
143 lines
3.6 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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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* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "stream.h"
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#include "lib/allocators/allocators.h" // page_aligned_alloc
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#include "lib/allocators/shared_ptr.h"
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#include "codec.h"
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//#include "lib/timer.h"
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//TIMER_ADD_CLIENT(tc_stream);
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OutputBufferManager::OutputBufferManager()
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{
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Reset();
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}
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void OutputBufferManager::Reset()
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{
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m_buffer = 0;
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m_size = 0;
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m_capacity = 0;
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}
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void OutputBufferManager::SetBuffer(u8* buffer, size_t size)
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{
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debug_assert(IsAllowableBuffer(buffer, size));
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m_buffer = buffer;
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m_size = size;
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}
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void OutputBufferManager::AllocateBuffer(size_t size)
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{
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// notes:
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// - this implementation allows reusing previous buffers if they
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// are big enough, which reduces the number of allocations.
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// - no further attempts to reduce allocations (e.g. by doubling
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// the current size) are made; this strategy is enough.
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// - Pool etc. cannot be used because files may be huge (larger
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// than the address space of 32-bit systems).
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// no buffer or the previous one wasn't big enough: reallocate
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if(!m_mem || m_capacity < size)
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{
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m_mem.reset((u8*)page_aligned_alloc(size), PageAlignedDeleter<u8>(size));
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m_capacity = size;
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}
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SetBuffer(m_mem.get(), size);
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}
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bool OutputBufferManager::IsAllowableBuffer(u8* buffer, size_t size)
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{
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// none yet established
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if(m_buffer == 0 && m_size == 0)
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return true;
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// same as last time (happens with temp buffers)
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if(m_buffer == buffer && m_size == size)
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return true;
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// located after the last buffer (note: not necessarily after
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// the entire buffer; a lack of input can cause the output buffer
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// to only partially be used before the next call.)
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if((unsigned)(buffer - m_buffer) <= m_size)
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return true;
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return false;
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}
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//-----------------------------------------------------------------------------
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Stream::Stream(const PICodec& codec)
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: m_codec(codec)
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, m_inConsumed(0), m_outProduced(0)
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{
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}
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void Stream::AllocateOutputBuffer(size_t outSizeMax)
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{
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m_outputBufferManager.AllocateBuffer(outSizeMax);
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}
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void Stream::SetOutputBuffer(u8* out, size_t outSize)
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{
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m_outputBufferManager.SetBuffer(out, outSize);
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}
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LibError Stream::Feed(const u8* in, size_t inSize)
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{
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if(m_outProduced == m_outputBufferManager.Size()) // output buffer full; must not call Process
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return INFO::OK;
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size_t inConsumed, outProduced;
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u8* const out = m_outputBufferManager.Buffer() + m_outProduced;
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const size_t outSize = m_outputBufferManager.Size() - m_outProduced;
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RETURN_ERR(m_codec->Process(in, inSize, out, outSize, inConsumed, outProduced));
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m_inConsumed += inConsumed;
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m_outProduced += outProduced;
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return INFO::CB_CONTINUE;
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}
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LibError Stream::Finish()
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{
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size_t outProduced;
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RETURN_ERR(m_codec->Finish(m_checksum, outProduced));
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m_outProduced += outProduced;
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return INFO::OK;
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}
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LibError FeedStream(uintptr_t cbData, const u8* in, size_t inSize)
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{
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// TIMER_ACCRUE(tc_stream);
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Stream& stream = *(Stream*)cbData;
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return stream.Feed(in, inSize);
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}
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