/*
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% %
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% %
% %
% M M AAA CCCC %
% MM MM A A C %
% M M M AAAAA C %
% M M A A C %
% M M A A CCCC %
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% Read MacPaint Image Format %
% %
% Software Design %
% Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2016 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 %
% %
% http://www.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/cache.h"
#include "MagickCore/colormap.h"
#include "MagickCore/colorspace.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/monitor.h"
#include "MagickCore/monitor-private.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/static.h"
#include "MagickCore/string_.h"
#include "MagickCore/module.h"
/*
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% R e a d M A C I m a g e %
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% ReadMACImage() reads an MacPaint 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_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image
*image;
MagickBooleanType
status;
register Quantum
*q;
register ssize_t
x;
register unsigned char
*p;
size_t
length;
ssize_t
offset,
y;
unsigned char
count,
bit,
byte,
*pixels;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickCoreSignature);
image=AcquireImage(image_info,exception);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
/*
Read MAC X image.
*/
length=ReadBlobLSBShort(image);
if ((length & 0xff) != 0)
ThrowReaderException(CorruptImageError,"CorruptImage");
for (x=0; x < (ssize_t) 638; x++)
if (ReadBlobByte(image) == EOF)
ThrowReaderException(CorruptImageError,"CorruptImage");
image->columns=576;
image->rows=720;
image->depth=1;
if (AcquireImageColormap(image,2,exception) == MagickFalse)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
status=SetImageExtent(image,image->columns,image->rows,exception);
if (status == MagickFalse)
return(DestroyImageList(image));
/*
Convert MAC raster image to pixel packets.
*/
length=(image->columns+7)/8;
pixels=(unsigned char *) AcquireQuantumMemory(length+1,sizeof(*pixels));
if (pixels == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
p=pixels;
offset=0;
for (y=0; y < (ssize_t) image->rows; )
{
count=(unsigned char) ReadBlobByte(image);
if (EOFBlob(image) != MagickFalse)
break;
if ((count <= 0) || (count >= 128))
{
byte=(unsigned char) (~ReadBlobByte(image));
count=(~count)+2;
while (count != 0)
{
*p++=byte;
offset++;
count--;
if (offset >= (ssize_t) length)
{
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
break;
p=pixels;
bit=0;
byte=0;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (bit == 0)
byte=(*p++);
SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
bit++;
byte<<=1;
if (bit == 8)
bit=0;
q+=GetPixelChannels(image);
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
offset=0;
p=pixels;
y++;
}
}
continue;
}
count++;
while (count != 0)
{
byte=(unsigned char) (~ReadBlobByte(image));
*p++=byte;
offset++;
count--;
if (offset >= (ssize_t) length)
{
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
break;
p=pixels;
bit=0;
byte=0;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (bit == 0)
byte=(*p++);
SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
bit++;
byte<<=1;
if (bit == 8)
bit=0;
q+=GetPixelChannels(image);
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
offset=0;
p=pixels;
y++;
}
}
}
pixels=(unsigned char *) RelinquishMagickMemory(pixels);
(void) SyncImage(image,exception);
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
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% R e g i s t e r M A C I m a g e %
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% RegisterMACImage() adds attributes for the MAC X 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:
%
% size_t RegisterMACImage(void)
%
*/
ModuleExport size_t RegisterMACImage(void)
{
MagickInfo
*entry;
entry=AcquireMagickInfo("MAC","MAC","MAC Paint");
entry->decoder=(DecodeImageHandler *) ReadMACImage;
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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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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%
% 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");
}