mirror of
https://github.com/ptitSeb/Serious-Engine
synced 2024-10-05 23:44:51 +02:00
116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
/* Copyright (c) 2002-2012 Croteam Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as published by
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the Free Software Foundation
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This program 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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
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#ifndef SE_INCL_BUFFER_H
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#define SE_INCL_BUFFER_H
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#ifdef PRAGMA_ONCE
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#pragma once
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#endif
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#include <Engine/Base/Timer.h>
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/*
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* Class for buffering data streams at byte level.
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*/
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class CBuffer {
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public:
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SLONG bu_slAllocationStep; // how many bytes to add when buffer overflows
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SLONG bu_slWriteOffset; // where to write to next
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SLONG bu_slReadOffset; // where to read from next
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SLONG bu_slFree; // number of bytes free
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SLONG bu_slSize; // current buffer size
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UBYTE *bu_pubBuffer; // buffer memory
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// default constructor
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CBuffer(void);
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// destructor
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~CBuffer(void);
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// free buffer
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void Clear(void);
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// expand buffer to be given number of bytes in size
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void Expand(SLONG slNewSize);
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// set how many bytes to add when buffer overflows
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void SetAllocationStep(SLONG slStep);
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// read bytes from buffer
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SLONG ReadBytes(void *pv, SLONG slSize);
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// skip bytes from buffer (read without actually reading)
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SLONG SkipBytes(SLONG slSize);
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// read bytes from buffer to stream
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SLONG ReadBytesToStream(CTStream &strm, SLONG slSize);
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// unread bytes from buffer
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void UnreadBytes(SLONG slSize);
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// check how many bytes are there to read
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SLONG QueryReadBytes(void);
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// write bytes to buffer
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void WriteBytes(const void *pv, SLONG slSize);
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// move all data from another buffer to this one
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void MoveBuffer(CBuffer &buFrom);
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};
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// data for limiting bandwidth/lantency and calculating statistics in block-buffers
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class CBlockBufferStats {
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public:
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FLOAT bbs_fLatencyLimit; // minimum latency in seconds
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FLOAT bbs_fLatencyVariation;// additional latency variation
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FLOAT bbs_fBandwidthLimit; // maximum bandwidth in bps (bits per second)
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CTimerValue bbs_tvTimeUsed; // next point in time free for data receiving
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void Clear(void);
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// get time when block of given size will be finished if started now
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CTimerValue GetBlockFinalTime(SLONG slSize);
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};
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/*
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* Class for buffering data streams at block level.
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*/
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class CBlockBuffer : public CBuffer {
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public:
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CBlockBufferStats *bb_pbbsStats; // for bandwidth/latency stats and limits
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SLONG bb_slBlockSizeRead; // block size left for reading (0 if not inside block)
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SLONG bb_slBlockSizeWrite; // block size left for writing (0 if not inside block)
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// default constructor
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CBlockBuffer(void);
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// destructor
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~CBlockBuffer(void);
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// free buffer
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void Clear(void);
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// read one block if possible
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BOOL ReadBlock(void *pv, SLONG &slSize);
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// read one block from buffer to stream
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BOOL ReadBlockToStream(CTStream &strm);
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// write one block
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void WriteBlock(const void *pv, SLONG slSize);
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// unread one block
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void UnreadBlock(SLONG slSize);
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// read raw block data
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SLONG ReadRawBlock(void *pv, SLONG slSize);
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// write raw block data
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void WriteRawBlock(const void *pv, SLONG slSize);
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// unread raw block data
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void UnreadRawBlock(SLONG slSize);
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// move all data from another buffer to this one
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void MoveBlockBuffer(CBlockBuffer &buFrom);
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// peek sizes of next block
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void PeekBlockSize(SLONG &slExpectedSize, SLONG &slReceivedSoFar);
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};
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#endif /* include-once check. */
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