ref: 05b7e25ca466172d071d17e9f3f665f992342431
dir: /src/w_file_win32.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 "config.h" #ifdef _WIN32 #include <stdio.h> #define WIN32_LEAN_AND_MEAN #include <windows.h> #include "i_system.h" #include "w_file.h" #include "z_zone.h" // This constant doesn't exist in VC6: #ifndef INVALID_SET_FILE_POINTER #define INVALID_SET_FILE_POINTER 0xffffffff #endif typedef struct { wad_file_t wad; HANDLE handle; HANDLE handle_map; } win32_wad_file_t; extern wad_file_class_t win32_wad_file; static void MapFile(win32_wad_file_t *wad, char *filename) { wad->handle_map = CreateFileMapping(wad->handle, NULL, PAGE_WRITECOPY, 0, 0, NULL); if (wad->handle_map == NULL) { fprintf(stderr, "W_Win32_OpenFile: Unable to CreateFileMapping() " "for %s\n", filename); return; } wad->wad.mapped = MapViewOfFile(wad->handle_map, FILE_MAP_COPY, 0, 0, 0); if (wad->wad.mapped == NULL) { fprintf(stderr, "W_Win32_OpenFile: Unable to MapViewOfFile() for %s\n", filename); } } unsigned int GetFileLength(HANDLE handle) { DWORD result; result = SetFilePointer(handle, 0, NULL, FILE_END); if (result == INVALID_SET_FILE_POINTER) { I_Error("W_Win32_OpenFile: Failed to read file length"); } return result; } static wad_file_t *W_Win32_OpenFile(char *path) { win32_wad_file_t *result; wchar_t wpath[MAX_PATH + 1]; HANDLE handle; // Open the file: MultiByteToWideChar(CP_OEMCP, 0, path, strlen(path) + 1, wpath, sizeof(wpath)); handle = CreateFileW(wpath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (handle == INVALID_HANDLE_VALUE) { return NULL; } // Create a new win32_wad_file_t to hold the file handle. result = Z_Malloc(sizeof(win32_wad_file_t), PU_STATIC, 0); result->wad.file_class = &win32_wad_file; result->wad.length = GetFileLength(handle); result->handle = handle; // Try to map the file into memory with mmap: MapFile(result, path); return &result->wad; } static void W_Win32_CloseFile(wad_file_t *wad) { win32_wad_file_t *win32_wad; win32_wad = (win32_wad_file_t *) wad; // If mapped, unmap it. if (win32_wad->wad.mapped != NULL) { UnmapViewOfFile(win32_wad->wad.mapped); } if (win32_wad->handle_map != NULL) { CloseHandle(win32_wad->handle_map); } // Close the file if (win32_wad->handle != NULL) { CloseHandle(win32_wad->handle); } Z_Free(win32_wad); } // Read data from the specified position in the file into the // provided buffer. Returns the number of bytes read. size_t W_Win32_Read(wad_file_t *wad, unsigned int offset, void *buffer, size_t buffer_len) { win32_wad_file_t *win32_wad; DWORD bytes_read; DWORD result; win32_wad = (win32_wad_file_t *) wad; // Jump to the specified position in the file. result = SetFilePointer(win32_wad->handle, offset, NULL, FILE_BEGIN); if (result == INVALID_SET_FILE_POINTER) { I_Error("W_Win32_Read: Failed to set file pointer to %i", offset); } // Read into the buffer. if (!ReadFile(win32_wad->handle, buffer, buffer_len, &bytes_read, NULL)) { I_Error("W_Win32_Read: Error reading from file"); } return bytes_read; } wad_file_class_t win32_wad_file = { W_Win32_OpenFile, W_Win32_CloseFile, W_Win32_Read, }; #endif /* #ifdef _WIN32 */