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| -rw-r--r-- | src/w_file_win32.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/w_file_win32.c b/src/w_file_win32.c new file mode 100644 index 00000000..1e7061ef --- /dev/null +++ b/src/w_file_win32.c @@ -0,0 +1,182 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// Copyright(C) 1993-1996 Id Software, Inc. +// Copyright(C) 2008 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. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA +// 02111-1307, USA. +// +// DESCRIPTION: +// WAD I/O functions. +// +//----------------------------------------------------------------------------- + +#include "config.h" + +#ifdef _WIN32 + +#define WIN32_LEAN_AND_MEAN +#include <windows.h> + +#include "w_file.h" +#include "z_zone.h" + +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_READ, 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; + HANDLE handle; + OFSTRUCT fileinfo; + + handle = OpenFile(path, &fileinfo, OF_READ); + + if (handle == (HANDLE) HFILE_ERROR) + { + 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.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_START); + + 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 */ + |