ref: 5bddaa7c571d0abf1543fbc9c735bc5054f568ef
dir: /src/w_file.c/
// // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // DESCRIPTION: // WAD I/O functions. // #include <stdio.h> #include "config.h" #include "doomtype.h" #include "m_argv.h" #include "w_file.h" extern wad_file_class_t stdc_wad_file; #ifdef _WIN32 extern wad_file_class_t win32_wad_file; #endif #ifdef HAVE_MMAP extern wad_file_class_t posix_wad_file; #endif static wad_file_class_t *wad_file_classes[] = { #ifdef _WIN32 &win32_wad_file, #endif #ifdef HAVE_MMAP &posix_wad_file, #endif &stdc_wad_file, }; wad_file_t *W_OpenFile(char *path) { wad_file_t *result; int i; //! // Use the OS's virtual memory subsystem to map WAD files // directly into memory. // if (!M_CheckParm("-mmap")) { return stdc_wad_file.OpenFile(path); } // Try all classes in order until we find one that works result = NULL; for (i=0; i<arrlen(wad_file_classes); ++i) { result = wad_file_classes[i]->OpenFile(path); if (result != NULL) { break; } } return result; } void W_CloseFile(wad_file_t *wad) { wad->file_class->CloseFile(wad); } size_t W_Read(wad_file_t *wad, unsigned int offset, void *buffer, size_t buffer_len) { return wad->file_class->Read(wad, offset, buffer, buffer_len); }