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