XSTRAW.CPP (9157B)
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/XSTRAW.CPP 1 3/03/97 10:26a 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 : XSTRAW.CPP * 24 * * 25 * Programmer : Joe L. Bostic * 26 * * 27 * Start Date : 07/04/96 * 28 * * 29 * Last Update : July 4, 1996 [JLB] * 30 * * 31 *---------------------------------------------------------------------------------------------* 32 * Functions: * 33 * BufferStraw::Get -- Fetch data from the straw's buffer holding tank. * 34 * FileStraw::Get -- Fetch data from the file. * 35 * FileStraw::~FileStraw -- The destructor for the file straw. * 36 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ 37 #include "FUNCTION.H" 38 #include "xstraw.h" 39 #include <stddef.h> 40 #include <string.h> 41 42 //--------------------------------------------------------------------------------------------------------- 43 // BufferStraw 44 //--------------------------------------------------------------------------------------------------------- 45 46 47 /*********************************************************************************************** 48 * BufferStraw::Get -- Fetch data from the straw's buffer holding tank. * 49 * * 50 * This routine will copy the requested number of bytes from the buffer holding tank (as * 51 * set up by the straw's constructor) to the buffer specified. * 52 * * 53 * INPUT: source -- Pointer to the buffer to be filled with data. * 54 * * 55 * length -- The number of bytes requested. * 56 * * 57 * OUTPUT: Returns with the number of bytes copied to the buffer. If this is less than * 58 * requested, then it indicates that the data holding tank buffer is exhausted. * 59 * * 60 * WARNINGS: none * 61 * * 62 * HISTORY: * 63 * 07/03/1996 JLB : Created. * 64 *=============================================================================================*/ 65 int BufferStraw::Get(void * source, int slen) 66 { 67 int total = 0; 68 69 if (Is_Valid() && source != NULL && slen > 0) { 70 int len = slen; 71 if (BufferPtr.Get_Size() != 0) { 72 int theoretical_max = BufferPtr.Get_Size() - Index; 73 len = (slen < theoretical_max) ? slen : theoretical_max; 74 } 75 76 if (len > 0) { 77 memmove(source, ((char*)BufferPtr.Get_Buffer()) + Index, len); 78 } 79 80 Index += len; 81 // Length -= len; 82 // BufferPtr = ((char *)BufferPtr) + len; 83 total += len; 84 } 85 return(total); 86 } 87 88 89 //--------------------------------------------------------------------------------------------------------- 90 // FileStraw 91 //--------------------------------------------------------------------------------------------------------- 92 93 94 /*********************************************************************************************** 95 * FileStraw::Get -- Fetch data from the file. * 96 * * 97 * This routine will read data from the file (as specified in the straw's constructor) into * 98 * the buffer indicated. * 99 * * 100 * INPUT: source -- Pointer to the buffer to hold the data. * 101 * * 102 * length -- The number of bytes requested. * 103 * * 104 * OUTPUT: Returns with the number of bytes stored into the buffer. If this number is less * 105 * than the number requested, then this indicates that the file is exhausted. * 106 * * 107 * WARNINGS: none * 108 * * 109 * HISTORY: * 110 * 07/03/1996 JLB : Created. * 111 *=============================================================================================*/ 112 int FileStraw::Get(void * source, int slen) 113 { 114 if (Valid_File() && source != NULL && slen > 0) { 115 if (!File->Is_Open()) { 116 HasOpened = true; 117 if (!File->Is_Available()) return(0); 118 if (!File->Open(READ)) return(0); 119 } 120 121 return(File->Read(source, slen)); 122 } 123 return(0); 124 } 125 126 127 /*********************************************************************************************** 128 * FileStraw::~FileStraw -- The destructor for the file straw. * 129 * * 130 * This destructor only needs to close the file if it was the one to open it. * 131 * * 132 * INPUT: none * 133 * * 134 * OUTPUT: none * 135 * * 136 * WARNINGS: none * 137 * * 138 * HISTORY: * 139 * 07/03/1996 JLB : Created. * 140 *=============================================================================================*/ 141 FileStraw::~FileStraw(void) 142 { 143 if (Valid_File() && HasOpened) { 144 File->Close(); 145 HasOpened = false; 146 File = NULL; 147 } 148 }