119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
//
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// Copyright(C) 1993-1996 Id Software, Inc.
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// Copyright(C) 2005-2014 Simon Howard
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// DESCRIPTION:
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// WAD I/O functions.
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//
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#include <stdio.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "m_misc.h"
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#include "w_file.h"
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#include "z_zone.h"
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typedef struct
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{
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wad_file_t wad;
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int fd;
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} stdc_wad_file_t;
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extern wad_file_class_t stdc_wad_file;
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static unsigned int W_StdC_FileLength(int fd)
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{
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long savedpos;
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long length;
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// save the current position in the file
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savedpos = lseek(fd, 0, SEEK_CUR);
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// jump to the end and find the length
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length = lseek(fd, 0, SEEK_END);
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// go back to the old location
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lseek(fd, savedpos, SEEK_SET);
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return length;
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}
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static wad_file_t *W_StdC_OpenFile(char *path)
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{
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stdc_wad_file_t *result;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd <= 0)
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{
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return NULL;
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}
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// Create a new stdc_wad_file_t to hold the file handle.
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result = Z_Malloc(sizeof(stdc_wad_file_t), PU_STATIC, 0);
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result->wad.file_class = &stdc_wad_file;
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result->wad.mapped = NULL;
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result->wad.length = W_StdC_FileLength(fd);
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result->fd = fd;
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return &result->wad;
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}
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static void W_StdC_CloseFile(wad_file_t *wad)
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{
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stdc_wad_file_t *stdc_wad;
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stdc_wad = (stdc_wad_file_t *) wad;
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close(stdc_wad->fd);
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Z_Free(stdc_wad);
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}
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// Read data from the specified position in the file into the
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// provided buffer. Returns the number of bytes read.
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size_t W_StdC_Read(wad_file_t *wad, unsigned int offset,
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void *buffer, size_t buffer_len)
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{
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stdc_wad_file_t *stdc_wad;
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size_t result;
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stdc_wad = (stdc_wad_file_t *) wad;
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// Jump to the specified position in the file.
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lseek(stdc_wad->fd, offset, SEEK_SET);
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// Read into the buffer.
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result = read(stdc_wad->fd, buffer, buffer_len);
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return result;
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}
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wad_file_class_t stdc_wad_file =
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{
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W_StdC_OpenFile,
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W_StdC_CloseFile,
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W_StdC_Read,
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};
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