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/*
% Copyright (C) 2010-2020 GraphicsMagick Group
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% M M AAA CCC %
% MM MM A A C %
% M M M AAAAA C %
% M M A A C %
% M M A A CCC %
% %
% Read MAC: MacPaint Image Format. %
% %
% %
% Software Design %
% Jaroslav Fojtik %
% 2010 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/colormap.h"
#include "magick/constitute.h"
#include "magick/log.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d M A C I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadMACImage reads an MAC image file and returns it. It
% allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% The format of the ReadMACImage method is:
%
% Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadMACImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or if
% the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image *image;
unsigned int y;
unsigned char x8, rep, b;
size_t ldblk;
unsigned char *BImgBuff = NULL;
unsigned char *DataPtr;
unsigned int status;
const PixelPacket *q;
/* Open image file. */
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image = AllocateImage(image_info);
status = OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
/* Read MAC image. */
ldblk = ReadBlobLSBShort(image);
if ((ldblk & 0xFF)!=0)
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
if (ldblk==0) /* ???? don't know why */
SeekBlob(image,0x200,SEEK_SET);
else
SeekBlob(image,0x280,SEEK_SET);
image->columns = 576;
image->rows = 720;
image->depth = 1;
image->colors = 1l << image->depth;
if (!AllocateImageColormap(image,image->colors)) goto NoMemory;
/* If ping is true, then only set image size and colors without reading any image data. */
if (image_info->ping) goto DONE_READING;
/* ----- Load RLE compressed raster ----- */
ldblk = (MagickArraySize(image->depth,image->columns)) /8;
BImgBuff = MagickAllocateResourceLimitedMemory(unsigned char *,ldblk);
if (BImgBuff==NULL)
NoMemory:
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
DataPtr = BImgBuff;
x8=0; y=0;
while (y<image->rows)
{
rep = ReadBlobByte(image);
if(EOFBlob(image)) break;
if ( rep>=128 || rep<= 0)
{
b = ~ReadBlobByte(image);;
rep = ~rep + 2;
while (rep>0)
{
*DataPtr++ = b;
x8++;
rep--;
if(x8>=ldblk)
{
x8=0;
q = SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *)NULL) break;
(void)ImportImagePixelArea(image,GrayQuantum,1,BImgBuff,NULL,0);
if (!SyncImagePixels(image)) break;
DataPtr = BImgBuff;
y++;
if ( y >= image->rows )
{
break;
}
}
}
}
else
{
rep++;
while ( rep > 0 )
{
b = ~ReadBlobByte(image);
*DataPtr++ = b;
x8++;
rep--;
if ( x8>=ldblk )
{
x8=0;
q = SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *)NULL) break;
(void)ImportImagePixelArea(image,GrayQuantum,1,BImgBuff,NULL,0);
if (!SyncImagePixels(image)) break;
DataPtr = BImgBuff;
y++;
if ( y >= image->rows )
{
break;
}
}
}
}
}
if (BImgBuff!=NULL)
MagickFreeResourceLimitedMemory(BImgBuff);
if (EOFBlob(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,image->filename);
DONE_READING:
CloseBlob(image);
StopTimer(&image->timer);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r M A C I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterMACImage adds attributes for the MAC 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 RegisterMACImage method is:
%
% RegisterMACImage(void)
*/
ModuleExport void RegisterMACImage(void)
{
MagickInfo *entry;
entry=SetMagickInfo("MAC");
entry->decoder = (DecoderHandler)ReadMACImage;
entry->description="Mac Paint";
entry->seekable_stream = True;
entry->module="MAC";
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r M A C I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterMACImage removes format registrations made by the
% MAC module from the list of supported formats.
%
% The format of the UnregisterMACImage method is:
%
% UnregisterMACImage(void)
%
*/
ModuleExport void UnregisterMACImage(void)
{
(void) UnregisterMagickInfo("MAC");
}
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