166 lines
5.2 KiB
C
166 lines
5.2 KiB
C
/*
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* stdio/physfs abstraction layer 2003-04-02
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*
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* Adam D. Moss <adam@gimp.org> <aspirin@icculus.org>
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*
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* These wrapper macros and functions are designed to allow a program
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* to perform file I/O with identical semantics and syntax regardless
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* of whether PhysicsFS is being used or not.
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*/
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#ifndef _ABS_FILE_H
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#define _ABS_FILE_H
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/*
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PLEASE NOTE: This license applies to abs-file.h ONLY (to make it clear that
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you may embed this wrapper code within commercial software); PhysicsFS itself
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is (at the time of writing) released under a different license with
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additional restrictions.
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Copyright (C) 2002-2003 Adam D. Moss (the "Author"). All Rights Reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is fur-
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nished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
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NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
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NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the Author of the
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Software shall not be used in advertising or otherwise to promote the sale,
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use or other dealings in this Software without prior written authorization
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from the Author.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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/*
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* API:
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*
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* Macro/function use like stdio equivalent...
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* -------------- ----------------------------
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* MY_FILETYPE FILE
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* MY_OPEN_FOR_READ fopen(..., "rb")
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* MY_READ fread(...)
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* MY_CLOSE fclose(...)
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* MY_GETC fgetc(...)
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* MY_GETS fgets(...)
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* MY_ATEOF feof(...)
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* MY_TELL ftell(...)
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* MY_SEEK fseek(..., SEEK_SET)
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* MY_REWIND rewind(...)
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* MY_SETBUFFER (not a standard for stdio, does nothing there)
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*/
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/*
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* Important DEFINEs:
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* It is important to define these consistantly across the various
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* compilation modules of your program if you wish to exchange file
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* handles between them.
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*
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* USE_PHYSFS: Define USE_PHYSFS if PhysicsFS is being used; note that if
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* you do intend to use PhysicsFS then you will still need to initialize
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* PhysicsFS yourself and set up its search-paths.
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*
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* Optional DEFINEs:
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*
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* PHYSFS_DEFAULT_READ_BUFFER <bytes>: If set then abs-file.h sets the
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* PhysicsFS buffer size to this value whenever you open a file. You
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* may over-ride this on a per-filehandle basis by using the
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* MY_SETBUFFER() macro (which simply does nothing when not using
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* PhysicsFS). If you have not defined this value explicitly then
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* abs-file.h will default to the same default buffer size as used by
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* stdio if it can be determined, or 8192 bytes otherwise.
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*/
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#ifndef PHYSFS_DEFAULT_READ_BUFFER
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#ifdef BUFSIZ
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#define PHYSFS_DEFAULT_READ_BUFFER BUFSIZ
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#else
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#define PHYSFS_DEFAULT_READ_BUFFER 8192
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#endif
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#endif
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#ifdef USE_PHYSFS
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#include <physfs.h>
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#define MY_FILETYPE PHYSFS_File
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#define MY_SETBUFFER(fp,size) PHYSFS_setBuffer(fp,size)
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#define MY_READ(p,s,n,fp) PHYSFS_read(fp,p,s,n)
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#if PHYSFS_DEFAULT_READ_BUFFER
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static MY_FILETYPE* MY_OPEN_FOR_READ(const char *const filename)
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{
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MY_FILETYPE *const file = PHYSFS_openRead(filename);
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if (file) {
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MY_SETBUFFER(file, PHYSFS_DEFAULT_READ_BUFFER);
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}
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return file;
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}
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#else
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#define MY_OPEN_FOR_READ(fn) PHYSFS_openRead(fn)
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#endif
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static int MY_GETC(MY_FILETYPE *const fp) {
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unsigned char c;
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/*if (PHYSFS_eof(fp)) {
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return EOF;
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}
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MY_READ(&c, 1, 1, fp);*/
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if (MY_READ(&c, 1, 1, fp) != 1) {
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return EOF;
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}
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return c;
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}
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static char * MY_GETS(char * const str, const int size,
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MY_FILETYPE *const fp) {
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int i = 0;
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int c;
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do {
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if (i == size-1) {
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break;
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}
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c = MY_GETC(fp);
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if (c == EOF) {
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break;
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}
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str[i++] = c;
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} while (c != '\0' &&
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c != -1 &&
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c != '\n');
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str[i] = '\0';
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if (i == 0) {
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return NULL;
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}
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return str;
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}
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#define MY_CLOSE(fp) PHYSFS_close(fp)
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#define MY_ATEOF(fp) PHYSFS_eof(fp)
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#define MY_TELL(fp) PHYSFS_tell(fp)
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#define MY_SEEK(fp,o) PHYSFS_seek(fp,o)
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#define MY_REWIND(fp) MY_SEEK(fp,0)
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#else
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#define MY_FILETYPE FILE
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#define MY_READ(p,s,n,fp) fread(p,s,n,fp)
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#define MY_OPEN_FOR_READ(n) fopen(n, "rb")
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#define MY_GETC(fp) fgetc(fp)
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#define MY_GETS(str,size,fp) fgets(str,size,fp)
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#define MY_CLOSE(fp) fclose(fp)
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#define MY_ATEOF(fp) feof(fp)
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#define MY_TELL(fp) ftell(fp)
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#define MY_SEEK(fp,o) fseek(fp,o, SEEK_SET)
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#define MY_REWIND(fp) rewind(fp)
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/*static void MY_SETBUFFER(const MY_FILETYPE *const file, const int num) { }*/
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#define MY_SETBUFFER(fp,size)
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#endif
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#endif
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