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DEFINITIONS
This source file includes following definitions.
- ReadFDImage
- RegisterFDImage
- UnregisterFDImage
/*
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% Retrieve An Image Via a File Descriptor. %
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% Software Design %
% John Cristy %
% Bill Radcliffe %
% March 2000 %
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% Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
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% 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 %
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% 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. %
% %
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*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/constitute.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/module.h"
#include "magick/pixel-accessor.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/resource_.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/utility.h"
/*
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% R e a d F D I m a g e %
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% ReadFDImage retrieves an image via a file descriptor, decodes the image,
% and returns it. It allocates the memory necessary for the new Image
% structure and returns a pointer to the new image.
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% The format of the ReadFDImage method is:
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% Image *ReadFDImage(const ImageInfo *image_info,ExceptionInfo *exception)
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% A description of each parameter follows:
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% o image_info: the image info.
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% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadFDImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image
*image;
ImageInfo
*read_info;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
read_info=CloneImageInfo(image_info);
read_info->file=fdopen(StringToLong(image_info->filename),"rb");
if (read_info->file == (FILE *) NULL)
{
ThrowFileException(exception,BlobError,"UnableToOpenBlob",
image_info->filename);
return((Image *) NULL);
}
*read_info->magick='\0';
image=ReadImage(read_info,exception);
(void) fclose(read_info->file);
read_info=DestroyImageInfo(read_info);
if (image == (Image *) NULL)
{
(void) ThrowMagickException(exception,GetMagickModule(),CoderError,
"NoDataReturned","`%s'",image_info->filename);
return((Image *) NULL);
}
return(GetFirstImageInList(image));
}
/*
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% R e g i s t e r F D I m a g e %
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% RegisterFDImage() adds attributes for the FD 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 RegisterFDImage method is:
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% size_t RegisterFDImage(void)
%
*/
ModuleExport size_t RegisterFDImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("FD");
entry->decoder=(DecodeImageHandler *) ReadFDImage;
entry->description=ConstantString("Read image from a file descriptor");
entry->module=ConstantString("FD");
entry->stealth=MagickTrue;
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r F D I m a g e %
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% UnregisterFDImage() removes format registrations made by the FD module from
% the list of supported formats.
%
% The format of the UnregisterFDImage method is:
%
% UnregisterFDImage(void)
%
*/
ModuleExport void UnregisterFDImage(void)
{
(void) UnregisterMagickInfo("FD");
}