mirror of
https://github.com/gnustep/libs-gsweb.git
synced 2025-02-21 10:51:23 +00:00
d4cc39b551
get rid of RCS_ID as shortly discussed with David and Manuel git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gsweb/trunk@37929 72102866-910b-0410-8b05-ffd578937521
111 lines
2.8 KiB
Objective-C
111 lines
2.8 KiB
Objective-C
/** GSWPngImageInfo.m - <title>GSWeb: Class GSWImageInfo</title>
|
|
|
|
Copyright (C) 2009 Free Software Foundation, Inc.
|
|
|
|
Written by: David Ayers <ayers@fsfe.org>
|
|
Date: April 2009
|
|
|
|
$Revision: 26815 $
|
|
$Date: 2009-04-05 13:00:10 +0200$
|
|
|
|
This file is part of the GNUstep Web Library.
|
|
|
|
<license>
|
|
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
|
|
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
</license>
|
|
**/
|
|
|
|
#include "config.h"
|
|
|
|
#ifdef HAVE_LIBPNG
|
|
#include <png.h>
|
|
#endif
|
|
|
|
#include "GSWeb.h"
|
|
|
|
#ifdef HAVE_LIBPNG
|
|
typedef struct
|
|
{
|
|
NSData *data;
|
|
unsigned int offset;
|
|
} reader_struct_t;
|
|
|
|
static void
|
|
reader_func(png_structp png_struct,
|
|
png_bytep data,
|
|
png_size_t length)
|
|
{
|
|
reader_struct_t *r = png_get_io_ptr(png_struct);
|
|
|
|
if (r->offset + length > [r->data length])
|
|
{
|
|
png_error(png_struct, "end of buffer");
|
|
return;
|
|
}
|
|
memcpy(data, [r->data bytes] + r->offset, length);
|
|
r->offset += length;
|
|
}
|
|
#endif
|
|
|
|
@implementation GSWPngImageInfo
|
|
-(id)initWithContentsOfFile: (NSString *)path
|
|
{
|
|
#ifdef HAVE_LIBPNG
|
|
if ((self = [super init]))
|
|
{
|
|
NSData *data = [NSData dataWithContentsOfFile: path];
|
|
const png_bytep bytes = (png_bytep)[data bytes];
|
|
size_t len = [data length];
|
|
|
|
if (!png_sig_cmp(bytes,0,len))
|
|
{
|
|
png_structp png_struct;
|
|
png_infop png_info, png_end_info;
|
|
reader_struct_t reader;
|
|
|
|
png_struct = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
png_info = png_create_info_struct(png_struct);
|
|
png_end_info = png_create_info_struct(png_struct);
|
|
|
|
if (setjmp(png_jmpbuf(png_struct)))
|
|
{
|
|
png_destroy_read_struct(&png_struct, &png_info, &png_end_info);
|
|
RELEASE(self);
|
|
return nil;
|
|
}
|
|
|
|
reader.data = data;
|
|
reader.offset = 0;
|
|
|
|
png_set_read_fn(png_struct, &reader, reader_func);
|
|
png_read_info(png_struct, png_info);
|
|
|
|
DESTROY(_widthString);
|
|
DESTROY(_heightString);
|
|
_width = png_get_image_width(png_struct, png_info);
|
|
_height = png_get_image_height(png_struct, png_info);
|
|
|
|
png_destroy_read_struct(&png_struct, &png_info, &png_end_info);
|
|
}
|
|
}
|
|
#else
|
|
GSOnceMLog(@"PNG support not configured for GSWeb.");
|
|
DESTROY(self);
|
|
#endif
|
|
|
|
return self;
|
|
}
|
|
@end
|
|
|