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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% OOO RRRR AAA %
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% O O R R A A %
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% O O RRRR AAAAA %
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% O O R R A A %
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% OOO R R A A %
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% %
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% %
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% Read OpenRaster (.ora) files %
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% %
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% OpenRaster spec: %
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% https://www.freedesktop.org/wiki/Specifications/OpenRaster/ %
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% %
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% Implementer %
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% Christopher Chianelli %
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% August 2020 %
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% %
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% %
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% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
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% dedicated to making software imaging solutions freely available. %
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% %
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% You may not use this file except in compliance with the License. You may %
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% obtain a copy of the License at %
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% %
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% https://imagemagick.org/script/license.php %
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% %
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% Unless required by applicable law or agreed to in writing, software %
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% distributed under the License is distributed on an "AS IS" BASIS, %
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
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% See the License for the specific language governing permissions and %
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% limitations under the License. %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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%
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*/
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/*
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Include declarations.
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*/
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#include "MagickCore/studio.h"
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#include "MagickCore/blob.h"
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#include "MagickCore/blob-private.h"
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#include "MagickCore/constitute.h"
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#include "MagickCore/exception.h"
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#include "MagickCore/exception-private.h"
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#include "MagickCore/image.h"
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#include "MagickCore/image-private.h"
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#include "MagickCore/list.h"
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#include "MagickCore/magick.h"
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#include "MagickCore/memory_.h"
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#include "MagickCore/module.h"
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#include "MagickCore/quantum-private.h"
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#include "MagickCore/static.h"
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#include "MagickCore/resource_.h"
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#include "MagickCore/string_.h"
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#include "MagickCore/utility.h"
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#if defined(MAGICKCORE_ZIP_DELEGATE)
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#include <zip.h>
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#endif
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% R e a d O R A I m a g e %
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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% ReadORAImage reads an ORA file in the most basic way possible: by
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% reading it as a ZIP File and extracting the mergedimage.png file from it,
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% which is then passed to ReadPNGImage.
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%
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% https://www.freedesktop.org/wiki/Specifications/OpenRaster/Draft/FileLayout/
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%
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% The format of the ReadORAImage method is:
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%
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% Image *ReadORAImage(const ImageInfo *image_info,ExceptionInfo *exception)
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%
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% A description of each parameter follows:
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%
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% o image_info: the image info.
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%
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% o exception: return any errors or warnings in this structure.
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%
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*/
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#if defined(MAGICKCORE_PNG_DELEGATE) && defined(MAGICKCORE_ZIP_DELEGATE)
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static Image *ReadORAImage(const ImageInfo *image_info,
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ExceptionInfo *exception)
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{
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char
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image_data_buffer[8192];
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const char
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*MERGED_IMAGE_PATH = "mergedimage.png";
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FILE
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*file;
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Image
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*image_metadata,
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*out_image;
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ImageInfo
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*read_info;
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int
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unique_file,
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zip_error;
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MagickBooleanType
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status;
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struct stat
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stat_info;
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zip_t
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*zip_archive;
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zip_file_t
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*merged_image_file;
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zip_uint64_t
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read_bytes,
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offset;
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image_metadata=AcquireImage(image_info,exception);
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read_info=CloneImageInfo(image_info);
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SetImageInfoBlob(read_info,(void *) NULL,0);
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stat(image_info->filename,&stat_info);
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zip_archive=zip_open(image_info->filename,ZIP_RDONLY,&zip_error);
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if (zip_archive == NULL)
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{
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ThrowFileException(exception,FileOpenError,"UnableToOpenFile",
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image_info->filename);
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read_info=DestroyImageInfo(read_info);
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image_metadata=DestroyImage(image_metadata);
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return((Image *) NULL);
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}
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merged_image_file=zip_fopen(zip_archive,MERGED_IMAGE_PATH,ZIP_FL_UNCHANGED);
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if (merged_image_file == NULL)
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{
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ThrowFileException(exception,FileOpenError,"UnableToOpenFile",
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image_info->filename);
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read_info=DestroyImageInfo(read_info);
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image_metadata=DestroyImage(image_metadata);
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zip_discard(zip_archive);
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return((Image *) NULL);
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}
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/* Get a temporary file to write the mergedimage.png of the ZIP to */
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(void) CopyMagickString(read_info->magick,"PNG",MagickPathExtent);
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unique_file=AcquireUniqueFileResource(read_info->unique);
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(void) CopyMagickString(read_info->filename,read_info->unique,
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MagickPathExtent);
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file=(FILE *) NULL;
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if (unique_file != -1)
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file=fdopen(unique_file,"wb");
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if ((unique_file == -1) || (file == (FILE *) NULL))
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{
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ThrowFileException(exception,FileOpenError,"UnableToCreateTemporaryFile",
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read_info->filename);
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if (unique_file != -1)
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(void) RelinquishUniqueFileResource(read_info->filename);
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read_info=DestroyImageInfo(read_info);
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image_metadata=DestroyImage(image_metadata);
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zip_fclose(merged_image_file);
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zip_discard(zip_archive);
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return((Image *) NULL);
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}
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/* Write the uncompressed mergedimage.png to the temporary file */
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status=MagickTrue;
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offset=0;
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while (status != MagickFalse)
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{
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read_bytes=zip_fread(merged_image_file,image_data_buffer+offset,
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sizeof(image_data_buffer)-offset);
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if (read_bytes == -1)
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status=MagickFalse;
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else if (read_bytes == 0)
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{
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/* Write up to offset of image_data_buffer to temp file */
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if (!fwrite(image_data_buffer,offset,1,file))
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status=MagickFalse;
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break;
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}
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else if (read_bytes == sizeof(image_data_buffer)-offset)
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{
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/* Write the entirely of image_data_buffer to temp file */
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if (!fwrite(image_data_buffer,sizeof(image_data_buffer),1,file))
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status=MagickFalse;
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else
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offset=0;
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}
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else
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offset+=read_bytes;
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}
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(void) fclose(file);
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(void) zip_fclose(merged_image_file);
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(void) zip_discard(zip_archive);
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if (status == MagickFalse)
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{
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ThrowFileException(exception,CoderError,"UnableToReadImageData",
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read_info->filename);
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(void) RelinquishUniqueFileResource(read_info->filename);
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read_info=DestroyImageInfo(read_info);
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image_metadata=DestroyImage(image_metadata);
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return((Image *) NULL);
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}
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/* Delegate to ReadImage to read mergedimage.png */
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out_image=ReadImage(read_info,exception);
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(void) RelinquishUniqueFileResource(read_info->filename);
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read_info=DestroyImageInfo(read_info);
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/* Update fields of image from fields of png_image */
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if (out_image != NULL)
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{
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(void) CopyMagickString(out_image->filename,image_metadata->filename,
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MagickPathExtent);
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(void) CopyMagickString(out_image->magick_filename,
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image_metadata->magick_filename,MagickPathExtent);
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out_image->timestamp=time(&stat_info.st_mtime);
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(void) CopyMagickString(out_image->magick,image_metadata->magick,
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MagickPathExtent);
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out_image->extent=stat_info.st_size;
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}
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image_metadata=DestroyImage(image_metadata);
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return(out_image);
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}
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#endif /* MAGICKCORE_ZIP_DELEGATE && MAGICKCORE_PNG_DELEGATE */
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% R e g i s t e r O R A I m a g e %
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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% RegisterORAImage() adds attributes for the ORA image format to
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% the list of supported formats. The attributes include the image format
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% tag, a method to read and/or write the format, whether the format
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% supports the saving of more than one frame to the same file or blob,
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% whether the format supports native in-memory I/O, and a brief
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% description of the format.
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%
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% The format of the RegisterORAImage method is:
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%
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% size_t RegisterORAImage(void)
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%
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*/
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ModuleExport size_t RegisterORAImage(void)
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{
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MagickInfo
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*entry;
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entry=AcquireMagickInfo("ORA","ORA","OpenRaster format");
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#if defined(MAGICKCORE_ZIP_DELEGATE) && defined(MAGICKCORE_PNG_DELEGATE)
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entry->decoder=(DecodeImageHandler *) ReadORAImage;
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#endif
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entry->flags^=CoderBlobSupportFlag;
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entry->flags|=CoderDecoderSeekableStreamFlag;
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entry->format_type=ExplicitFormatType;
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(void) RegisterMagickInfo(entry);
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return(MagickImageCoderSignature);
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% U n r e g i s t e r O R A I m a g e %
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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% UnregisterORAImage() removes format registrations made by the
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% ORA module from the list of supported formats.
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%
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% The format of the UnregisterORAImage method is:
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%
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% UnregisterORAImage(void)
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%
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*/
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ModuleExport void UnregisterORAImage(void)
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{
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(void) UnregisterMagickInfo("ORA");
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}
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