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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% SSSSS TTTTT EEEEE GGGG AAA N N OOO %
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% SS T E G A A NN N O O %
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% SSS T EEE G GG AAAAA N N N O O %
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% SS T E G G A A N NN O O %
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% SSSSS T EEEEE GGG A A N N OOO %
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% %
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% %
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% Write A Steganographic Image. %
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% %
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% Software Design %
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% Cristy %
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% July 1992 %
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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/cache.h"
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#include "MagickCore/colormap.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/monitor.h"
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#include "MagickCore/monitor-private.h"
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#include "MagickCore/pixel-accessor.h"
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#include "MagickCore/quantum-private.h"
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#include "MagickCore/static.h"
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#include "MagickCore/string_.h"
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#include "MagickCore/module.h"
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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 S T E G A N O 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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% ReadSTEGANOImage() reads a steganographic image hidden within another
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% image type. It allocates the memory necessary for the new Image structure
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% and returns a pointer to the new image.
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%
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% The format of the ReadSTEGANOImage method is:
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%
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% Image *ReadSTEGANOImage(const ImageInfo *image_info,
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% 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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static Image *ReadSTEGANOImage(const ImageInfo *image_info,
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ExceptionInfo *exception)
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{
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#define GetBit(alpha,i) (((size_t) (alpha) >> (size_t) (i)) & 0x01)
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#define SetBit(i,set) SetPixelIndex(image,(Quantum) ((set) != 0 ? \
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(size_t) GetPixelIndex(image,q) | (one << (size_t) (i)) : \
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(size_t) GetPixelIndex(image,q) & ~(one << (size_t) (i))),q)
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Image
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*image,
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*watermark;
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ImageInfo
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*read_info;
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int
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c;
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MagickBooleanType
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status;
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PixelInfo
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pixel;
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Quantum
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*q;
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ssize_t
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x;
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size_t
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depth,
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one;
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ssize_t
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i,
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j,
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k,
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y;
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/*
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Initialize Image structure.
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*/
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assert(image_info != (const ImageInfo *) NULL);
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assert(image_info->signature == MagickCoreSignature);
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if (image_info->debug != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
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image_info->filename);
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assert(exception != (ExceptionInfo *) NULL);
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assert(exception->signature == MagickCoreSignature);
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one=1;
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image=AcquireImage(image_info,exception);
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if ((image->columns == 0) || (image->rows == 0))
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ThrowReaderException(OptionError,"MustSpecifyImageSize");
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read_info=CloneImageInfo(image_info);
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SetImageInfoBlob(read_info,(void *) NULL,0);
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*read_info->magick='\0';
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watermark=ReadImage(read_info,exception);
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read_info=DestroyImageInfo(read_info);
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if (watermark == (Image *) NULL)
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return(DestroyImage(image));
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watermark->depth=MAGICKCORE_QUANTUM_DEPTH;
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if (AcquireImageColormap(image,MaxColormapSize,exception) == MagickFalse)
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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if (image_info->ping != MagickFalse)
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{
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(void) CloseBlob(image);
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return(GetFirstImageInList(image));
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}
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status=SetImageExtent(image,image->columns,image->rows,exception);
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if (status == MagickFalse)
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return(DestroyImageList(image));
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for (y=0; y < (ssize_t) image->rows; y++)
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{
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q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
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if (q == (Quantum *) NULL)
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break;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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SetPixelIndex(image,0,q);
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q+=GetPixelChannels(image);
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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}
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/*
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Get hidden watermark from low-order bits of image.
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*/
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c=0;
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i=0;
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j=0;
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i=(ssize_t) (watermark->depth-1);
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depth=watermark->depth;
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for (k=image->offset; (i >= 0) && (j < (ssize_t) depth); i--)
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{
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for (y=0; (y < (ssize_t) image->rows) && (j < (ssize_t) depth); y++)
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{
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x=0;
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for ( ; (x < (ssize_t) image->columns) && (j < (ssize_t) depth); x++)
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{
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if ((k/(ssize_t) watermark->columns) >= (ssize_t) watermark->rows)
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break;
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(void) GetOneVirtualPixelInfo(watermark,UndefinedVirtualPixelMethod,
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k % (ssize_t) watermark->columns,k/(ssize_t) watermark->columns,
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&pixel,exception);
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q=GetAuthenticPixels(image,x,y,1,1,exception);
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if (q == (Quantum *) NULL)
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break;
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switch (c)
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{
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case 0:
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{
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SetBit(i,GetBit(pixel.red,j));
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break;
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}
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case 1:
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{
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SetBit(i,GetBit(pixel.green,j));
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break;
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}
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case 2:
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{
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SetBit(i,GetBit(pixel.blue,j));
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break;
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}
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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c++;
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if (c == 3)
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c=0;
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k++;
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if (k == (ssize_t) (watermark->columns*watermark->columns))
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k=0;
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if (k == image->offset)
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j++;
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}
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}
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status=SetImageProgress(image,LoadImagesTag,(MagickOffsetType) i,depth);
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if (status == MagickFalse)
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break;
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}
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watermark=DestroyImage(watermark);
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(void) SyncImage(image,exception);
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return(GetFirstImageInList(image));
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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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% R e g i s t e r S T E G A N O 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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% RegisterSTEGANOImage() adds attributes for the STEGANO 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 RegisterSTEGANOImage method is:
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%
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% size_t RegisterSTEGANOImage(void)
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%
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*/
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ModuleExport size_t RegisterSTEGANOImage(void)
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{
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MagickInfo
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*entry;
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entry=AcquireMagickInfo("STEGANO","STEGANO","Steganographic image");
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entry->decoder=(DecodeImageHandler *) ReadSTEGANOImage;
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entry->format_type=ImplicitFormatType;
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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 S T E G A N O 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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% UnregisterSTEGANOImage() removes format registrations made by the
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% STEGANO module from the list of supported formats.
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%
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% The format of the UnregisterSTEGANOImage method is:
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%
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% UnregisterSTEGANOImage(void)
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%
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*/
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ModuleExport void UnregisterSTEGANOImage(void)
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{
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(void) UnregisterMagickInfo("STEGANO");
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}
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