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/*
% Copyright (C) 2003-2022 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% IIIII CCCC OOO N N %
% I C O O NN N %
% I C O O N N N %
% I C O O N NN %
% IIIII CCCC OOO N N %
% %
% %
% Read Microsoft Windows Icon Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% Re-written %
% Bob Friesenhahn %
% January 2015 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/colormap.h"
#include "magick/log.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/* http://msdn.microsoft.com/en-us/library/ms997538.aspx */
#define MaxIcons 256
/*
Icon Entry
*/
typedef struct _IconDirEntry
{
magick_uint8_t
width,
height,
colors,
reserved;
magick_uint16_t
planes,
bits_per_pixel;
magick_uint32_t
size,
offset;
} IconDirEntry;
/*
Icon Directory
*/
typedef struct _IconFile
{
magick_uint16_t
reserved,
resource_type, /* 1 = ICON, 2 = CURSOR */
count;
IconDirEntry
directory[MaxIcons];
} IconFile;
static void LogICONDirEntry(const unsigned int i, const IconDirEntry *icon_entry)
{
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"IconDirEntry[%u]:\n"
" Width: %u\n"
" Height: %u\n"
" Colors: %u\n"
" Reserved: %u\n"
" Planes: %u\n"
" BPP: %u\n"
" Size: %u\n"
" Offset: %u",
i,
(unsigned int) icon_entry->width,
(unsigned int) icon_entry->height,
(unsigned int) icon_entry->colors,
(unsigned int) icon_entry->reserved,
(unsigned int) icon_entry->planes,
(unsigned int) icon_entry->bits_per_pixel,
(unsigned int) icon_entry->size,
(unsigned int) icon_entry->offset
);
}
static void LogICONFile(const IconFile *icon_file)
{
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"IconFile:\n"
" Reserved: %u\n"
" ResourceType: %u\n"
" Count: %u",
(unsigned int) icon_file->reserved,
(unsigned int) icon_file->resource_type,
(unsigned int) icon_file->count
);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d I C O N I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadIconImage reads a Microsoft icon 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 ReadIconImage method is:
%
% Image *ReadIconImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadIconImage 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 *ReadIconImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
IconFile
icon_file;
Image
*image;
unsigned char
*data;
size_t
data_alloc_size;
register long
i;
unsigned int
status;
/*
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 and validate icon header
*/
icon_file.reserved=ReadBlobLSBShort(image);
icon_file.resource_type=ReadBlobLSBShort(image);
icon_file.count=ReadBlobLSBShort(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
if (image->logging)
LogICONFile(&icon_file);
/*
Windows ICO and CUR formats are essentially the same except that
.CUR uses resource_type==1 while .ICO uses resource_type=2.
*/
if ((icon_file.reserved != 0) ||
((icon_file.resource_type != 1) &&
(icon_file.resource_type != 2)) ||
(icon_file.count > MaxIcons))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
/*
Read and validate icon directory.
*/
data_alloc_size=0;
data=(unsigned char *) NULL;
for (i=0; i < icon_file.count; i++)
{
/* 0 - 255, 0 means 256! */
icon_file.directory[i].width=ReadBlobByte(image);
/* 0 - 255, 0 means 256! */
icon_file.directory[i].height=ReadBlobByte(image);
icon_file.directory[i].colors=ReadBlobByte(image);
icon_file.directory[i].reserved=ReadBlobByte(image);
icon_file.directory[i].planes=ReadBlobLSBShort(image);
icon_file.directory[i].bits_per_pixel=ReadBlobLSBShort(image);
icon_file.directory[i].size=ReadBlobLSBLong(image);
icon_file.directory[i].offset=ReadBlobLSBLong(image);
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image->logging)
LogICONDirEntry(i,&icon_file.directory[i]);
if (
/*
Restrict allocation size
*/
(icon_file.directory[i].size < 20) ||
(icon_file.directory[i].size > 256+256*256*2*4) ||
/*
planes
In ICO format (1): Specifies color planes. Should be 0 or 1.
In CUR format (2): Specifies the horizontal coordinates of
the hotspot in number of pixels from the left.
*/
((icon_file.resource_type == 1) &&
(icon_file.directory[i].planes != 0) &&
(icon_file.directory[i].planes != 1)) ||
/*
bits_per_pixel
In ICO format (1): Specifies bits per pixel.
In CUR format (2): Specifies the vertical coordinates of the
hotspot in number of pixels from the top.
*/
((icon_file.resource_type == 1) &&
((icon_file.directory[i].bits_per_pixel >= 8) &&
(icon_file.directory[i].colors != 0))) ||
(icon_file.directory[i].size == 0) ||
(icon_file.directory[i].offset == 0))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
data_alloc_size=Max(data_alloc_size,icon_file.directory[i].size);
}
data=MagickAllocateResourceLimitedMemory(unsigned char *,data_alloc_size);
if (data == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
for (i=0; i < icon_file.count; i++)
{
/*
Verify and read icons
*/
Image
*icon_image;
ImageInfo
*read_info;
char
dib_size[MaxTextExtent],
format[MaxTextExtent];
size_t
count;
if (SeekBlob(image,icon_file.directory[i].offset,SEEK_SET) !=
(magick_off_t) icon_file.directory[i].offset)
{
if (image->logging)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"Failed to seek to offset %u",
icon_file.directory[i].offset);
MagickFreeResourceLimitedMemory(data);
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
}
if ((count=ReadBlob(image,icon_file.directory[i].size,data)) != icon_file.directory[i].size)
{
if (image->logging)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"Read %" MAGICK_SIZE_T_F "u bytes from blob"
" (expected %" MAGICK_SIZE_T_F "u bytes)",
(MAGICK_SIZE_T) count,
(MAGICK_SIZE_T) icon_file.directory[i].size);
MagickFreeResourceLimitedMemory(data);
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
}
format[0]='\0';
if (memcmp(data,"\050\000\000\000",4) == 0)
(void) strlcpy(format,"ICODIB",sizeof(format));
else if (memcmp(data,"\211PNG\r\n\032\n",8) == 0)
(void) strlcpy(format,"PNG",sizeof(format));
if (format[0] == '\0')
{
MagickFreeResourceLimitedMemory(data);
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
}
if (image->logging)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"Reading icon using %s format",
format);
icon_image=(Image *) NULL;
read_info=CloneImageInfo(image_info);
if (read_info != (const ImageInfo *) NULL)
{
(void) strlcpy(read_info->magick,format,MaxTextExtent);
(void) strlcpy(read_info->filename,format,MaxTextExtent);
(void) strlcat(read_info->filename,":",MaxTextExtent);
FormatString(dib_size,"%ux%u",
icon_file.directory[i].width == 0 ? 256 :
icon_file.directory[i].width,
icon_file.directory[i].height == 0 ? 256 :
icon_file.directory[i].height);
(void) CloneString(&read_info->size,dib_size);
icon_image=BlobToImage(read_info,data,icon_file.directory[i].size,exception);
DestroyImageInfo(read_info);
read_info=(ImageInfo *) NULL;
}
if (icon_image == (Image *) NULL)
{
MagickFreeResourceLimitedMemory(data);
DestroyImageList(image);
return((Image *) NULL);
}
DestroyBlob(icon_image);
icon_image->blob=ReferenceBlob(image->blob);
icon_image->scene=i;
(void) strlcpy(icon_image->magick,image_info->magick,
sizeof(icon_image->magick));
ReplaceImageInList(&image,icon_image);
StopTimer(&image->timer);
/*
Proceed to next image.
*/
if (image_info->subrange != 0)
if (image->scene >= (image_info->subimage+image_info->subrange-1))
break;
if (i < (long) (icon_file.count-1))
{
/*
Allocate next image structure.
*/
AllocateNextImage(image_info,image);
if (image->next == (Image *) NULL)
{
DestroyImageList(image);
return((Image *) NULL);
}
image=SyncNextImageInList(image);
if (!MagickMonitorFormatted(TellBlob(image),GetBlobSize(image),exception,
LoadImagesText,image->filename))
break;
}
} /* for (i=0; i < icon_file.count; i++) */
while (image->previous != (Image *) NULL)
image=image->previous;
CloseBlob(image);
MagickFreeResourceLimitedMemory(data);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r I C O N I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterICONImage adds attributes for the Icon 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 RegisterICONImage method is:
%
% RegisterICONImage(void)
%
*/
ModuleExport void RegisterICONImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("CUR");
entry->decoder=(DecoderHandler) ReadIconImage;
entry->adjoin=False;
entry->seekable_stream=True;
entry->description="Microsoft Cursor Icon";
entry->module="ICON";
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("ICO");
entry->decoder=(DecoderHandler) ReadIconImage;
entry->adjoin=False;
entry->seekable_stream=True;
entry->description="Microsoft Icon";
entry->module="ICON";
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("ICON");
entry->decoder=(DecoderHandler) ReadIconImage;
entry->adjoin=False;
entry->seekable_stream=True;
entry->description="Microsoft Icon";
entry->module="ICON";
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r I C O N I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterICONImage removes format registrations made by the
% ICON module from the list of supported formats.
%
% The format of the UnregisterICONImage method is:
%
% UnregisterICONImage(void)
%
*/
ModuleExport void UnregisterICONImage(void)
{
(void) UnregisterMagickInfo("CUR");
(void) UnregisterMagickInfo("ICO");
(void) UnregisterMagickInfo("ICON");
}
|
