<commit_before>/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 <NAME>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    <NAME>
    <EMAIL>
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* This file provides a general interface for SDL to read and write
   data sources.  It can easily be extended to files, memory, etc.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_rwops.h"

/* Functions to read/write stdio file pointers */

static int stdio_seek(SDL_RWops *context, int offset, int whence)
{
	if ( fseek(context->hidden.stdio.fp, offset, whence) == 0 ) {
		return(ftell(context->hidden.stdio.fp));
	} else {
		SDL_Error(SDL_EFSEEK);
		return(-1);
	}
}
static int stdio_read(SDL_RWops *context, void *ptr, int size, int maxnum)
{
	size_t nread;

	nread = fread(ptr, size, maxnum, context->hidden.stdio.fp); 
	if ( nread == 0 && ferror(context->hidden.stdio.fp) ) {
		SDL_Error(SDL_EFREAD);
	}
	return(nread);
}
static int stdio_write(SDL_RWops *context, const void *ptr, int size, int num)
{
	size_t nwrote;

	nwrote = fwrite(ptr, size, num, context->hidden.stdio.fp);
	if ( nwrote == 0 && ferror(context->hidden.stdio.fp) ) {
		SDL_Error(SDL_EFWRITE);
	}
	return(nwrote);
}
static int stdio_close(SDL_RWops *context)
{
	if ( context ) {
		if ( context->hidden.stdio.autoclose ) {
			/* WARNING:  Check the return value here! */
			fclose(context->hidden.stdio.fp);
		}
		free(context);
	}
	return(0);
}

/* Functions to read/write memory pointers */

static int mem_seek(SDL_RWops *context, int offset, int whence)
{
	Uint8 *newpos;

	switch (whence) {
		case SEEK_SET:
			newpos = context->hidden.mem.base+offset;
			break;
		case SEEK_CUR:
			newpos = context->hidden.mem.here+offset;
			break;
		case SEEK_END:
			newpos = context->hidden.mem.stop+offset;
			break;
		default:
			SDL_SetError("Unknown value for 'whence'");
			return(-1);
	}
	if ( newpos < context->hidden.mem.base ) {
		newpos = context->hidden.mem.base;
	}
	if ( newpos > context->hidden.mem.stop ) {
		newpos = context->hidden.mem.stop;
	}
	context->hidden.mem.here = newpos;
	return(context->hidden.mem.here-context->hidden.mem.base);
}
static int mem_read(SDL_RWops *context, void *ptr, int size, int maxnum)
{
	int num;

	num = maxnum;
	if ( (context->hidden.mem.here + (num*size)) > context->hidden.mem.stop ) {
		num = (context->hidden.mem.stop-context->hidden.mem.here)/size;
	}
	memcpy(ptr, context->hidden.mem.here, num*size);
	context->hidden.mem.here += num*size;
	return(num);
}
static int mem_write(SDL_RWops *context, const void *ptr, int size, int num)<commit_msg>Patch from Ant<NAME>:<commit_after>/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 <NAME>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    <NAME>
    <EMAIL>
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* This file provides a general interface for SDL to read and write
   data sources.  It can easily be extended to files, memory, etc.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_rwops.h"

/* Functions to read/write stdio file pointers */

static int stdio_seek(SDL_RWops *context, int offset, int whence)
{
	if ( fseek(context->hidden.stdio.fp, offset, whence) == 0 ) {
		return(ftell(context->hidden.stdio.fp));
	} else {
		SDL_Error(SDL_EFSEEK);
		return(-1);
	}
}
static int stdio_read(SDL_RWops *context, void *ptr, int size, int maxnum)
{
	size_t nread;

	nread = fread(ptr, size, maxnum, context->hidden.stdio.fp); 
	if ( nread == 0 && ferror(context->hidden.stdio.fp) ) {
		SDL_Error(SDL_EFREAD);
	}
	return(nread);
}
static int stdio_write(SDL_RWops *context, const void *ptr, int size, int num)
{
	size_t nwrote;

	nwrote = fwrite(ptr, size, num, context->hidden.stdio.fp);
	if ( nwrote == 0 && ferror(context->hidden.stdio.fp) ) {
		SDL_Error(SDL_EFWRITE);
	}
	return(nwrote);
}
static int stdio_close(SDL_RWops *context)
{
	if ( context ) {
		if ( context->hidden.stdio.autoclose ) {
			/* WARNING:  Check the return value here! */
			fclose(context->hidden.stdio.fp);
		}
		free(context);
	}
	return(0);
}

/* Functions to read/write memory pointers */

static int mem_seek(SDL_RWops *context, int offset, int whence)
{
	Uint8 *newpos;

	switch (whence) {
		case SEEK_SET:
			newpos = context->hidden.mem.base+offset;
			break;
		case SEEK_CUR:
			newpos = context->hidden.mem.here+offset;
			break;
		case SEEK_END:
			newpos = context->hidden.mem.stop+offset;
			break;
		default:
			SDL_SetError("Unknown value for 'whence'");
			return(-1);
	}
	if ( newpos < context->hidden.mem.base ) {
		newpos = context->hidden.mem.base;
	}
	if ( newpos > context->hidden.mem.stop ) {
		newpos = context->hidden.mem.stop;
	}
	context->hidden.mem.here = newpos;
	return(context->hidden.mem.here-context->hidden.mem.base);
}
static int mem_read(SDL_RWops *context, void *ptr, int size, int maxnum)
{
	int total_bytes;
	int mem_available;

	total_bytes = (maxnum * size);
	if ( (maxnum <= 0) || (size <= 0) || ((total_bytes / maxnum) != size) ) {
		return 0;
	}

	mem_available = (context->hidden.mem.stop - context->hidden.mem.here);
	if (total_bytes > mem_available) {
		total_bytes = mem_available;
	}

	memcpy(ptr, context->hidden.mem.here, total_bytes);
	context->hidden.mem.here += total_bytes;

	return (total_bytes / size);
}
static int mem_write(SDL_RWops *context, const void *ptr, int size, int num)
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{'dir': 'git-commits-cleaned', 'id': '3669575', 'n_tokens_mistral': 2538, 'n_tokens_neox': 2313, 'n_words': 700}