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Updates from Adam Moss for new buffering API.

This commit is contained in:
Ryan C. Gordon 2002-12-03 20:00:57 +00:00
parent fb81423a44
commit 069312c754
1 changed files with 62 additions and 7 deletions
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69
extras/abs-file.h
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@ -1,13 +1,11 @@
/*
* stdio/physfs abstraction layer 2002-08-29
* stdio/physfs abstraction layer 2002-12-03
*
* Adam D. Moss <adam@gimp.org> <aspirin@icculus.org>
*
* These wrapper macros and functions are designed to allow a program
* to perform file I/O with identical semantics and syntax regardless
* of whether PhysicsFS is being used or not. Define USE_PHYSFS if
* PhysicsFS is being usedl in this case you will still need to initialize
* PhysicsFS yourself and set up its search-paths.
* of whether PhysicsFS is being used or not.
*/
#ifndef _ABS_FILE_H
#define _ABS_FILE_H
@ -45,13 +43,69 @@ from the Author.
#include <stdlib.h>
#include <stdio.h>
/*
* API:
*
* Macro/function use like stdio equivalent...
* -------------- ----------------------------
* MY_FILETYPE FILE
* MY_OPEN_FOR_READ fopen(..., "rb")
* MY_READ fread(...)
* MY_CLOSE fclose(...)
* MY_GETC fgetc(...)
* MY_GETS fgets(...)
* MY_ATEOF feof(...)
* MY_REWIND rewind(...)
* MY_SETBUFFER (not a standard for stdio, does nothing there)
*/
/*
* Important DEFINEs:
* It is important to define these consistantly across the various
* compilation modules of your program if you wish to exchange file
* handles between them.
*
* USE_PHYSFS: Define USE_PHYSFS if PhysicsFS is being used; note that if
* you do intend to use PhysicsFS then you will still need to initialize
* PhysicsFS yourself and set up its search-paths.
*
* Optional DEFINEs:
*
* PHYSFS_DEFAULT_READ_BUFFER <bytes>: If set then abs-file.h sets the
* PhysicsFS buffer size to this value whenever you open a file. You
* may over-ride this on a per-filehandle basis by using the
* MY_SETBUFFER() macro (which simply does nothing when not using
* PhysicsFS). If you have not defined this value explicitly then
* abs-file.h will default to the same default buffer size as used by
* stdio if it can be determined, or 8192 bytes otherwise.
*/
#ifndef PHYSFS_DEFAULT_READ_BUFFER
#ifdef BUFSIZ
#define PHYSFS_DEFAULT_READ_BUFFER BUFSIZ
#else
#define PHYSFS_DEFAULT_READ_BUFFER 8192
#endif
#endif
#ifdef USE_PHYSFS
#include <physfs.h>
#define MY_FILETYPE PHYSFS_file
#define MY_SETBUFFER(fp,size) PHYSFS_setBuffer(fp,size)
#define MY_READ(p,s,n,fp) PHYSFS_read(fp,p,s,n)
#if PHYSFS_DEFAULT_READ_BUFFER
static MY_FILETYPE* MY_OPEN_FOR_READ(const char *const filename)
{
MY_FILETYPE *const file = PHYSFS_openRead(filename);
if (file) {
MY_SETBUFFER(file, PHYSFS_DEFAULT_READ_BUFFER);
}
return file;
}
#else
#define MY_OPEN_FOR_READ(fn) PHYSFS_openRead(fn)
static int MY_GETC(MY_FILETYPE * fp) {
#endif
static int MY_GETC(MY_FILETYPE *const fp) {
unsigned char c;
/*if (PHYSFS_eof(fp)) {
return EOF;
@ -62,7 +116,8 @@ static int MY_GETC(MY_FILETYPE * fp) {
}
return c;
}
static char * MY_GETS(char * const str, int size, MY_FILETYPE * fp) {
static char * MY_GETS(char * const str, const int size,
MY_FILETYPE *const fp) {
int i = 0;
int c;
do {
@ -97,7 +152,7 @@ static char * MY_GETS(char * const str, int size, MY_FILETYPE * fp) {
#define MY_CLOSE(fp) fclose(fp)
#define MY_ATEOF(fp) feof(fp)
#define MY_REWIND(fp) rewind(fp)
static void MY_SETBUFFER(const MY_FILETYPE *const file, const int num) { }
#endif
#endif