forked from openkylin/imagemagick
321 lines
11 KiB
C
321 lines
11 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% %
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% M M AAA CCCC %
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% MM MM A A C %
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% M M M AAAAA C %
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% M M A A C %
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% M M A A CCCC %
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% %
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% %
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% Read MacPaint Image Format %
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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 "magick/studio.h"
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#include "magick/blob.h"
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#include "magick/blob-private.h"
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#include "magick/cache.h"
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#include "magick/colormap.h"
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#include "magick/colorspace.h"
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#include "magick/exception.h"
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#include "magick/exception-private.h"
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#include "magick/image.h"
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#include "magick/image-private.h"
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#include "magick/list.h"
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#include "magick/magick.h"
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#include "magick/memory_.h"
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#include "magick/monitor.h"
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#include "magick/monitor-private.h"
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#include "magick/pixel-accessor.h"
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#include "magick/quantum-private.h"
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#include "magick/static.h"
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#include "magick/string_.h"
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#include "magick/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 M A C 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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% ReadMACImage() reads an MacPaint image file and returns it. It
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% allocates the memory necessary for the new Image structure and returns a
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% pointer to the new image.
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%
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% The format of the ReadMACImage method is:
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%
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% Image *ReadMACImage(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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static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
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{
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Image
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*image;
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MagickBooleanType
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status;
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IndexPacket
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*indexes;
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PixelPacket
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*q;
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ssize_t
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x;
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unsigned char
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*p;
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size_t
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length;
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ssize_t
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offset,
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y;
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unsigned char
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count,
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bit,
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byte,
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*pixels;
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/*
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Open image file.
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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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image=AcquireImage(image_info);
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status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
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if (status == MagickFalse)
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{
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image=DestroyImageList(image);
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return((Image *) NULL);
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}
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/*
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Read MAC X image.
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*/
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length=ReadBlobLSBShort(image);
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if ((length & 0xff) != 0)
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ThrowReaderException(CorruptImageError,"CorruptImage");
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for (x=0; x < (ssize_t) 638; x++)
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if (ReadBlobByte(image) == EOF)
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ThrowReaderException(CorruptImageError,"CorruptImage");
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image->columns=576;
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image->rows=720;
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image->depth=1;
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if (AcquireImageColormap(image,2) == 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);
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if (status == MagickFalse)
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{
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InheritException(exception,&image->exception);
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return(DestroyImageList(image));
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}
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status=ResetImagePixels(image,exception);
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if (status == MagickFalse)
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{
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InheritException(exception,&image->exception);
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return(DestroyImageList(image));
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}
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/*
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Convert MAC raster image to pixel packets.
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*/
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length=(image->columns+7)/8;
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pixels=(unsigned char *) AcquireQuantumMemory(length+257,sizeof(*pixels));
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if (pixels == (unsigned char *) NULL)
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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(void) memset(pixels,0,(length+257)*sizeof(*pixels));
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p=pixels;
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offset=0;
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for (y=0; y < (ssize_t) image->rows; )
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{
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count=(unsigned char) ReadBlobByte(image);
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if (EOFBlob(image) != MagickFalse)
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break;
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if ((count <= 0) || (count >= 128))
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{
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byte=(unsigned char) (~ReadBlobByte(image));
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count=(~count)+2;
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while (count != 0)
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{
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*p++=byte;
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offset++;
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count--;
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if (offset >= (ssize_t) length)
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{
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q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
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if (q == (PixelPacket *) NULL)
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break;
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indexes=GetAuthenticIndexQueue(image);
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p=pixels;
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bit=0;
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byte=0;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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if (bit == 0)
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byte=(*p++);
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SetPixelIndex(indexes+x,((byte & 0x80) != 0 ? 0x01 : 0x00));
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bit++;
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byte<<=1;
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if (bit == 8)
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bit=0;
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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offset=0;
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p=pixels;
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y++;
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}
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}
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continue;
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}
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count++;
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while (count != 0)
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{
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byte=(unsigned char) (~ReadBlobByte(image));
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*p++=byte;
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offset++;
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count--;
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if (offset >= (ssize_t) length)
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{
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q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
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if (q == (PixelPacket *) NULL)
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break;
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indexes=GetAuthenticIndexQueue(image);
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p=pixels;
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bit=0;
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byte=0;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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if (bit == 0)
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byte=(*p++);
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SetPixelIndex(indexes+x,((byte & 0x80) != 0 ? 0x01 : 0x00));
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bit++;
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byte<<=1;
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if (bit == 8)
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bit=0;
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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offset=0;
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p=pixels;
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y++;
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}
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}
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}
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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(void) SyncImage(image);
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(void) CloseBlob(image);
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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 M A C 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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% RegisterMACImage() adds attributes for the MAC X image format to the list
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% of supported formats. The attributes include the image format tag, a
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% method to read and/or write the format, whether the format supports the
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% saving of more than one frame to the same file or blob, whether the format
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% supports native in-memory I/O, and a brief description of the format.
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%
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% The format of the RegisterMACImage method is:
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%
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% size_t RegisterMACImage(void)
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%
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*/
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ModuleExport size_t RegisterMACImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("MAC");
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entry->decoder=(DecodeImageHandler *) ReadMACImage;
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entry->description=ConstantString("MAC Paint");
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entry->magick_module=ConstantString("MAC");
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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 M A C 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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% UnregisterMACImage() removes format registrations made by the
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% MAC module from the list of supported formats.
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%
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% The format of the UnregisterMACImage method is:
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%
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% UnregisterMACImage(void)
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%
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*/
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ModuleExport void UnregisterMACImage(void)
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{
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(void) UnregisterMagickInfo("MAC");
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}
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