/*    SDL_image:  An example image loading library for use with SDL    Copyright (C) 1997-2006 Sam Lantinga    This library is free software; you can redistribute it and/or    modify it under the terms of the GNU Lesser General Public    License as published by the Free Software Foundation; either    version 2.1 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    Lesser General Public License for more details.    You should have received a copy of the GNU Lesser General Public    License along with this library; if not, write to the Free Software    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA    Sam Lantinga    slouken@libsdl.org*//* This is a XV thumbnail image file loading framework */#include <stdio.h>#include <string.h>#include "SDL_image.h"#ifdef LOAD_XVstatic int get_line(SDL_RWops *src, char *line, int size){	while ( size > 0 ) {		if ( SDL_RWread(src, line, 1, 1) <= 0 ) {			return -1;		}		if ( *line == '\r' ) {			continue;		}		if ( *line == '\n' ) {			*line = '\0';			return 0;		}		++line;		--size;	}	/* Out of space for the line */	return -1;}static int get_header(SDL_RWops *src, int *w, int *h){	char line[1024];	*w = 0;	*h = 0;	/* Check the header magic */	if ( (get_line(src, line, sizeof(line)) < 0) ||	     (memcmp(line, "P7 332", 6) != 0) ) {		return -1;	}	/* Read the header */	while ( get_line(src, line, sizeof(line)) == 0 ) {		if ( memcmp(line, "#BUILTIN:", 9) == 0 ) {			/* Builtin image, no data */			break;		}		if ( memcmp(line, "#END_OF_COMMENTS", 16) == 0 ) {			if ( get_line(src, line, sizeof(line)) == 0 ) {				sscanf(line, "%d %d", w, h);				if ( *w >= 0 && *h >= 0 ) {					return 0;				}			}			break;		}	}	/* No image data */	return -1;}/* See if an image is contained in a data source */int IMG_isXV(SDL_RWops *src){	int start;	int is_XV;	int w, h;	if ( !src )		return 0;	start = SDL_RWtell(src);	is_XV = 0;	if ( get_header(src, &w, &h) == 0 ) {		is_XV = 1;	}	SDL_RWseek(src, start, SEEK_SET);	return(is_XV);}/* Load a XV thumbnail image from an SDL datasource */SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src){	int start;	const char *error = NULL;	SDL_Surface *surface = NULL;	int w, h;	Uint8 *pixels;	if ( !src ) {		/* The error message has been set in SDL_RWFromFile */		return NULL;	}	start = SDL_RWtell(src);	/* Read the header */	if ( get_header(src, &w, &h) < 0 ) {		error = "Unsupported image format";		goto done;	}	/* Create the 3-3-2 indexed palette surface */	surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, 0xe0, 0x1c, 0x03, 0);	if ( surface == NULL ) {		error = "Out of memory";		goto done;	}	/* Load the image data */	for ( pixels = (Uint8 *)surface->pixels; h > 0; --h ) {		if ( SDL_RWread(src, pixels, w, 1) <= 0 ) {			error = "Couldn't read image data";			goto done;		}		pixels += surface->pitch;	}done:	if ( error ) {		SDL_RWseek(src, start, SEEK_SET);		if ( surface ) {			SDL_FreeSurface(surface);			surface = NULL;		}		IMG_SetError(error);	}	return surface;}#else/* See if an image is contained in a data source */int IMG_isXV(SDL_RWops *src){	return(0);}/* Load a XXX type image from an SDL datasource */SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src){	return(NULL);}#endif /* LOAD_XV */