CSTRAW.CPP (5673B)
1 // 2 // Copyright 2020 Electronic Arts Inc. 3 // 4 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is free 5 // software: you can redistribute it and/or modify it under the terms of 6 // the GNU General Public License as published by the Free Software Foundation, 7 // either version 3 of the License, or (at your option) any later version. 8 9 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed 10 // in the hope that it will be useful, but with permitted additional restrictions 11 // under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 12 // distributed with this program. You should have received a copy of the 13 // GNU General Public License along with permitted additional restrictions 14 // with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection 15 16 /* $Header: /CounterStrike/CSTRAW.CPP 1 3/03/97 10:24a Joe_bostic $ */ 17 /*********************************************************************************************** 18 *** 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 *** 19 *********************************************************************************************** 20 * * 21 * Project Name : Command & Conquer * 22 * * 23 * File Name : CSTRAW.CPP * 24 * * 25 * Programmer : Joe L. Bostic * 26 * * 27 * Start Date : 11/10/96 * 28 * * 29 * Last Update : November 10, 1996 [JLB] * 30 * * 31 *---------------------------------------------------------------------------------------------* 32 * Functions: * 33 * CacheStraw::Get -- Fetch data from the data source. * 34 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ 35 36 #include "cstraw.h" 37 #include <string.h> 38 39 40 /*********************************************************************************************** 41 * CacheStraw::Get -- Fetch data from the data source. * 42 * * 43 * This will supply the data quantity requested. It performs a regulating influence on the * 44 * data requests passed through it. The data is requested from the next straw in the * 45 * chain such that the data stream is requested in chunks. This serves to lessen the * 46 * impact of multiple small data requests. * 47 * * 48 * INPUT: source -- Pointer to the buffer to hold the data. * 49 * * 50 * slen -- The number of data bytes requested. * 51 * * 52 * OUTPUT: Returns with the number of data bytes stored into the buffer specified. If this * 53 * number is less than that requested, it indicates that the data source has been * 54 * exhausted. * 55 * * 56 * WARNINGS: none * 57 * * 58 * HISTORY: * 59 * 11/10/1996 JLB : Created. * 60 *=============================================================================================*/ 61 int CacheStraw::Get(void * source, int slen) 62 { 63 int total = 0; 64 65 if (Is_Valid() && source != NULL && slen > 0) { 66 67 /* 68 ** Keep processing the data request until there is no more data to supply or the request 69 ** has been fulfilled. 70 */ 71 while (slen > 0) { 72 73 /* 74 ** First try to fetch the data from data previously loaded into the buffer. 75 */ 76 if (Length > 0) { 77 int tocopy = (Length < slen) ? Length : slen; 78 memmove(source, ((char *)BufferPtr.Get_Buffer()) + Index, tocopy); 79 slen -= tocopy; 80 Index += tocopy; 81 total += tocopy; 82 Length -= tocopy; 83 source = (char*)source + tocopy; 84 } 85 if (slen == 0) break; 86 87 /* 88 ** Since there is more to be fulfilled yet the holding buffer is empty, 89 ** refill the buffer with a fresh block of data from the source. 90 */ 91 Length = Straw::Get(BufferPtr, BufferPtr.Get_Size()); 92 Index = 0; 93 if (Length == 0) break; 94 } 95 } 96 return(total); 97 }