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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% OOO RRRR AAA %
% O O R R A A %
% O O RRRR AAAAA %
% O O R R A A %
% OOO R R A A %
% %
% %
% Read OpenRaster (.ora) files %
% %
% OpenRaster spec: %
% https://www.freedesktop.org/wiki/Specifications/OpenRaster/ %
% %
% Software Design %
% Jaroslav Fojtik %
% 2024 %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/colormap.h"
#include "magick/constitute.h"
#include "magick/image.h"
#include "magick/log.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/pixel_cache.h"
#include "magick/tempfile.h"
#include "magick/utility.h"
#if defined(HasPNG) && defined(HasZLIB) && (defined(HasUNZIP) || defined(HasLIBZIP))
#if defined(HasUNZIP)
#include "contrib/minizip/unzip.h"
#else
#include <zip.h>
#endif
static const char MERGED_IMAGE_PATH[] = "mergedimage.png";
#define BUFFER_SIZE 8196
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d O R A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadORAImage reads an ORA file in the most basic way possible: by
% reading it as a ZIP File and extracting the mergedimage.png file from it,
% which is then passed to ReadPNGImage.
% https://www.freedesktop.org/wiki/Specifications/OpenRaster/Draft/FileLayout/
%
% The format of the ReadORAImage method is:
%
% Image *ReadORAImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadORAImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or if
% the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
*/
static Image *ReadORAImage(const ImageInfo *image_info, ExceptionInfo *exception)
{
#if defined(HasUNZIP)
unzFile zip_archive;
#else
zip_t *zip_archive;
zip_file_t *merged_image_file;
#endif
Image *image;
int res;
void *buf;
FILE *PngFile;
ImageInfo *clone_info;
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image = AllocateImage(image_info);
buf = MagickAllocateResourceLimitedArray(void*,BUFFER_SIZE,1);
if(buf == NULL)
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
#if defined(HasUNZIP)
zip_archive = unzOpen(image_info->filename);
#else
zip_archive = zip_open(image_info->filename,ZIP_RDONLY,&res);
#endif
if(zip_archive == NULL)
{
MagickFreeResourceLimitedMemory(buf);
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
}
#if defined(HasUNZIP)
if(UNZ_OK != unzLocateFile(zip_archive,MERGED_IMAGE_PATH,0))
{
unzClose(zip_archive);
#else
merged_image_file = zip_fopen(zip_archive,MERGED_IMAGE_PATH,ZIP_FL_UNCHANGED);
if (merged_image_file == NULL)
{
zip_discard(zip_archive);
#endif
MagickFreeResourceLimitedMemory(buf);
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
}
clone_info = CloneImageInfo(image_info);
memcpy(clone_info->filename,"PNG:",4);
PngFile = AcquireTemporaryFileStream(clone_info->filename+4,BinaryFileIOMode);
if(!PngFile)
{
DestroyImageInfo(clone_info);
clone_info = (ImageInfo *) NULL;
#if defined(HasUNZIP)
unzClose(zip_archive);
#else
zip_discard(zip_archive);
#endif
MagickFreeResourceLimitedMemory(buf);
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
}
#if defined(HasUNZIP)
unzOpenCurrentFile(zip_archive);
while((res=unzReadCurrentFile(zip_archive,buf,BUFFER_SIZE)) > 0)
{
fwrite(buf,res,1,PngFile);
}
unzCloseCurrentFile(zip_archive);
#else
while((res=zip_fread(merged_image_file,buf,BUFFER_SIZE)) > 0)
{
fwrite(buf,res,1,PngFile);
}
(void)zip_fclose(merged_image_file);
(void)zip_discard(zip_archive);
#endif
fclose(PngFile);
MagickFreeResourceLimitedMemory(buf);
#if defined(HasUNZIP)
unzClose(zip_archive);
#endif
DestroyImage(image);
(void)strlcpy(clone_info->magick, "PNG", sizeof(clone_info->magick));
image = ReadImage(clone_info,exception);
DestroyImageInfo(clone_info);
clone_info = (ImageInfo*)NULL;
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r O R A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterORAImage adds attributes for the ORA image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterORAImage method is:
%
% RegisterORAImage(void)
%
*/
ModuleExport void RegisterORAImage(void)
{
MagickInfo *entry;
entry=SetMagickInfo("ORA");
entry->decoder = (DecoderHandler)ReadORAImage;
entry->description="Open Raster";
entry->module="ORA";
entry->adjoin=False;
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r O R A I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterORAImage removes format registrations made by the
% ORA module from the list of supported formats.
%
% The format of the UnregisterORAImage method is:
%
% UnregisterORAImage(void)
%
*/
ModuleExport void UnregisterORAImage(void)
{
(void) UnregisterMagickInfo("ORA");
}
#endif
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