1/*
2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3%                                                                             %
4%                                                                             %
5%                                                                             %
6%                               FFFFF  DDDD                                   %
7%                               F      D   D                                  %
8%                               FFF    D   D                                  %
9%                               F      D   D                                  %
10%                               F      DDDD                                   %
11%                                                                             %
12%                                                                             %
13%                  Retrieve An Image Via a File Descriptor.                   %
14%                                                                             %
15%                              Software Design                                %
16%                                   Cristy                                    %
17%                              Bill Radcliffe                                 %
18%                                March 2000                                   %
19%                                                                             %
20%                                                                             %
21%  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
22%  dedicated to making software imaging solutions freely available.           %
23%                                                                             %
24%  You may not use this file except in compliance with the License.  You may  %
25%  obtain a copy of the License at                                            %
26%                                                                             %
27%    http://www.imagemagick.org/script/license.php                            %
28%                                                                             %
29%  Unless required by applicable law or agreed to in writing, software        %
30%  distributed under the License is distributed on an "AS IS" BASIS,          %
31%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
32%  See the License for the specific language governing permissions and        %
33%  limitations under the License.                                             %
34%                                                                             %
35%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
36%
37%
38*/
39
40/*
41  Include declarations.
42*/
43#include "MagickCore/studio.h"
44#include "MagickCore/blob.h"
45#include "MagickCore/blob-private.h"
46#include "MagickCore/constitute.h"
47#include "MagickCore/exception.h"
48#include "MagickCore/exception-private.h"
49#include "MagickCore/image.h"
50#include "MagickCore/image-private.h"
51#include "MagickCore/list.h"
52#include "MagickCore/magick.h"
53#include "MagickCore/memory_.h"
54#include "MagickCore/module.h"
55#include "MagickCore/quantum-private.h"
56#include "MagickCore/static.h"
57#include "MagickCore/resource_.h"
58#include "MagickCore/string_.h"
59#include "MagickCore/string-private.h"
60#include "MagickCore/utility.h"
61
62/*
63%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
64%                                                                             %
65%                                                                             %
66%                                                                             %
67%   R e a d F D I m a g e                                                     %
68%                                                                             %
69%                                                                             %
70%                                                                             %
71%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
72%
73%  ReadFDImage retrieves an image via a file descriptor, decodes the image,
74%  and returns it.  It allocates the memory necessary for the new Image
75%  structure and returns a pointer to the new image.
76%
77%  The format of the ReadFDImage method is:
78%
79%      Image *ReadFDImage(const ImageInfo *image_info,ExceptionInfo *exception)
80%
81%  A description of each parameter follows:
82%
83%    o image_info: the image info.
84%
85%    o exception: return any errors or warnings in this structure.
86%
87*/
88static Image *ReadFDImage(const ImageInfo *image_info,ExceptionInfo *exception)
89{
90  Image
91    *image;
92
93  ImageInfo
94    *read_info;
95
96  /*
97    Open image file.
98  */
99  assert(image_info != (const ImageInfo *) NULL);
100  assert(image_info->signature == MagickCoreSignature);
101  if (image_info->debug != MagickFalse)
102    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
103      image_info->filename);
104  assert(exception != (ExceptionInfo *) NULL);
105  assert(exception->signature == MagickCoreSignature);
106  read_info=CloneImageInfo(image_info);
107  read_info->file=fdopen(StringToLong(image_info->filename),"rb");
108  if ((read_info->file ==  (FILE *) NULL) ||
109      (IsGeometry(image_info->filename) == MagickFalse))
110    {
111      read_info=DestroyImageInfo(read_info);
112      ThrowFileException(exception,BlobError,"UnableToOpenBlob",
113        image_info->filename);
114      return((Image *) NULL);
115    }
116  *read_info->magick='\0';
117  image=ReadImage(read_info,exception);
118  (void) fclose(read_info->file);
119  read_info=DestroyImageInfo(read_info);
120  if (image == (Image *) NULL)
121    {
122      (void) ThrowMagickException(exception,GetMagickModule(),CoderError,
123        "NoDataReturned","`%s'",image_info->filename);
124      return((Image *) NULL);
125    }
126  return(GetFirstImageInList(image));
127}
128
129/*
130%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
131%                                                                             %
132%                                                                             %
133%                                                                             %
134%   R e g i s t e r F D I m a g e                                             %
135%                                                                             %
136%                                                                             %
137%                                                                             %
138%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
139%
140%  RegisterFDImage() adds attributes for the FD image format to
141%  the list of supported formats.  The attributes include the image format
142%  tag, a method to read and/or write the format, whether the format
143%  supports the saving of more than one frame to the same file or blob,
144%  whether the format supports native in-memory I/O, and a brief
145%  description of the format.
146%
147%  The format of the RegisterFDImage method is:
148%
149%      size_t RegisterFDImage(void)
150%
151*/
152ModuleExport size_t RegisterFDImage(void)
153{
154  MagickInfo
155    *entry;
156
157  entry=AcquireMagickInfo("FD","FD","Read image from a file descriptor");
158  entry->decoder=(DecodeImageHandler *) ReadFDImage;
159  entry->flags|=CoderStealthFlag;
160  (void) RegisterMagickInfo(entry);
161  return(MagickImageCoderSignature);
162}
163
164/*
165%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
166%                                                                             %
167%                                                                             %
168%                                                                             %
169%   U n r e g i s t e r F D I m a g e                                         %
170%                                                                             %
171%                                                                             %
172%                                                                             %
173%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
174%
175%  UnregisterFDImage() removes format registrations made by the FD module from
176%  the list of supported formats.
177%
178%  The format of the UnregisterFDImage method is:
179%
180%      UnregisterFDImage(void)
181%
182*/
183ModuleExport void UnregisterFDImage(void)
184{
185  (void) UnregisterMagickInfo("FD");
186}
187