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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 1999-2019 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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register Quantum |
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*q; |
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register 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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