98 lines
5.5 KiB
C++
98 lines
5.5 KiB
C++
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//
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// Copyright 2020 Electronic Arts Inc.
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//
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
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// software: you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
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// in the hope that it will be useful, but with permitted additional restrictions
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// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
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// distributed with this program. You should have received a copy of the
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// GNU General Public License along with permitted additional restrictions
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// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
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/* $Header: /CounterStrike/CSTRAW.CPP 1 3/03/97 10:24a Joe_bostic $ */
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/***********************************************************************************************
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*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : CSTRAW.CPP *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : 11/10/96 *
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* *
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* Last Update : November 10, 1996 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* CacheStraw::Get -- Fetch data from the data source. *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#include "cstraw.h"
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#include <string.h>
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/***********************************************************************************************
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* CacheStraw::Get -- Fetch data from the data source. *
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* *
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* This will supply the data quantity requested. It performs a regulating influence on the *
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* data requests passed through it. The data is requested from the next straw in the *
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* chain such that the data stream is requested in chunks. This serves to lessen the *
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* impact of multiple small data requests. *
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* *
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* INPUT: source -- Pointer to the buffer to hold the data. *
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* *
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* slen -- The number of data bytes requested. *
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* *
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* OUTPUT: Returns with the number of data bytes stored into the buffer specified. If this *
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* number is less than that requested, it indicates that the data source has been *
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* exhausted. *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 11/10/1996 JLB : Created. *
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*=============================================================================================*/
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int CacheStraw::Get(void * source, int slen)
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{
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int total = 0;
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if (Is_Valid() && source != NULL && slen > 0) {
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/*
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** Keep processing the data request until there is no more data to supply or the request
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** has been fulfilled.
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*/
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while (slen > 0) {
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/*
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** First try to fetch the data from data previously loaded into the buffer.
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*/
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if (Length > 0) {
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int tocopy = (Length < slen) ? Length : slen;
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memmove(source, ((char *)BufferPtr.Get_Buffer()) + Index, tocopy);
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slen -= tocopy;
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Index += tocopy;
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total += tocopy;
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Length -= tocopy;
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source = (char*)source + tocopy;
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}
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if (slen == 0) break;
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/*
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** Since there is more to be fulfilled yet the holding buffer is empty,
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** refill the buffer with a fresh block of data from the source.
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*/
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Length = Straw::Get(BufferPtr, BufferPtr.Get_Size());
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Index = 0;
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if (Length == 0) break;
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}
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}
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return(total);
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}
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