granicus.if.org Git - imagemagick/blob - MagickCore/distribute-cache.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %    DDDD    IIIII   SSSSS  TTTTT  RRRR   IIIII  BBBB   U   U  TTTTT  EEEEE   %
   6 %    D   D     I     SS       T    R   R    I    B   B  U   U    T    E       %
   7 %    D   D     I      SSS     T    RRRR     I    BBBB   U   U    T    EEE     %
   8 %    D   D     I        SS    T    R R      I    B   B  U   U    T    E       %
   9 %    DDDDA   IIIII   SSSSS    T    R  R   IIIII  BBBB    UUU     T    EEEEE   %
  10 %                                                                             %
  11 %                      CCCC   AAA    CCCC  H   H  EEEEE                       %
  12 %                     C      A   A  C      H   H  E                           %
  13 %                     C      AAAAA  C      HHHHH  EEE                         %
  14 %                     C      A   A  C      H   H  E                           %
  15 %                      CCCC  A   A   CCCC  H   H  EEEEE                       %
  16 %                                                                             %
  17 %                                                                             %
  18 %                 MagickCore Distributed Pixel Cache Methods                  %
  19 %                                                                             %
  20 %                              Software Design                                %
  21 %                                   Cristy                                    %
  22 %                                January 2013                                 %
  23 %                                                                             %
  24 %                                                                             %
  25 %  Copyright 1999-2014 ImageMagick Studio LLC, a non-profit organization      %
  26 %  dedicated to making software imaging solutions freely available.           %
  27 %                                                                             %
  28 %  You may not use this file except in compliance with the License.  You may  %
  29 %  obtain a copy of the License at                                            %
  30 %                                                                             %
  31 %    http://www.imagemagick.org/script/license.php                            %
  32 %                                                                             %
  33 %  Unless required by applicable law or agreed to in writing, software        %
  34 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  35 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  36 %  See the License for the specific language governing permissions and        %
  37 %  limitations under the License.                                             %
  38 %                                                                             %
  39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  40 %
  41 % A distributed pixel cache is an extension of the traditional pixel cache
  42 % available on a single host.  The distributed pixel cache may span multiple
  43 % servers so that it can grow in size and transactional capacity to support
  44 % very large images.  Start up the pixel cache server on one or more machines.
  45 % When you read or operate on an image and the local pixel cache resources are
  46 % exhausted, ImageMagick contacts one or more of these remote pixel servers to
  47 % store or retrieve pixels.
  48 %
  49 */
  50 \f
  51 /*
  52   Include declarations.
  53 */
  54 #include "MagickCore/studio.h"
  55 #include "MagickCore/cache.h"
  56 #include "MagickCore/cache-private.h"
  57 #include "MagickCore/distribute-cache.h"
  58 #include "MagickCore/distribute-cache-private.h"
  59 #include "MagickCore/exception.h"
  60 #include "MagickCore/exception-private.h"
  61 #include "MagickCore/geometry.h"
  62 #include "MagickCore/image.h"
  63 #include "MagickCore/list.h"
  64 #include "MagickCore/locale_.h"
  65 #include "MagickCore/memory_.h"
  66 #include "MagickCore/nt-base-private.h"
  67 #include "MagickCore/pixel.h"
  68 #include "MagickCore/policy.h"
  69 #include "MagickCore/random_.h"
  70 #include "MagickCore/registry.h"
  71 #include "MagickCore/splay-tree.h"
  72 #include "MagickCore/string_.h"
  73 #include "MagickCore/string-private.h"
  74 #include "MagickCore/version.h"
  75 #include "MagickCore/version-private.h"
  76 #if defined(MAGICKCORE_HAVE_SOCKET) && defined(MAGICKCORE_THREAD_SUPPORT)
  77 #include <netinet/in.h>
  78 #include <netdb.h>
  79 #include <sys/socket.h>
  80 #include <arpa/inet.h>
  81 #else
  82 #undef send
  83 #undef recv
  84 #define send(file,buffer,length,flags)  0
  85 #define recv(file,buffer,length,flags)  0
  86 #endif
  87 \f
  88 /*
  89   Define declarations.
  90 */
  91 #define DPCHostname  "127.0.0.1"
  92 #define DPCPendingConnections  10
  93 #define DPCPort  6668
  94 #define DPCSessionKeyLength  8
  95 #ifndef MSG_NOSIGNAL
  96 #  define MSG_NOSIGNAL 0
  97 #endif
  98 \f
  99 /*
 100 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 101 %                                                                             %
 102 %                                                                             %
 103 %                                                                             %
 104 +   A c q u i r e D i s t r i b u t e C a c h e I n f o                       %
 105 %                                                                             %
 106 %                                                                             %
 107 %                                                                             %
 108 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 109 %
 110 %  AcquireDistributeCacheInfo() allocates the DistributeCacheInfo structure.
 111 %
 112 %  The format of the AcquireDistributeCacheInfo method is:
 113 %
 114 %      DistributeCacheInfo *AcquireDistributeCacheInfo(ExceptionInfo *exception)
 115 %
 116 %  A description of each parameter follows:
 117 %
 118 %    o exception: return any errors or warnings in this structure.
 119 %
 120 */
 121
 122 static inline MagickSizeType MagickMin(const MagickSizeType x,
 123   const MagickSizeType y)
 124 {
 125   if (x < y)
 126     return(x);
 127   return(y);
 128 }
 129
 130 static inline MagickOffsetType dpc_read(int file,const MagickSizeType length,
 131   unsigned char *restrict message)
 132 {
 133   register MagickOffsetType
 134     i;
 135
 136   ssize_t
 137     count;
 138
 139 #if !defined(MAGICKCORE_HAVE_SOCKET) || !defined(MAGICKCORE_THREAD_SUPPORT)
 140   magick_unreferenced(file);
 141   magick_unreferenced(message);
 142 #endif
 143
 144   count=0;
 145   for (i=0; i < (MagickOffsetType) length; i+=count)
 146   {
 147     count=recv(file,message+i,(size_t) MagickMin(length-i,(MagickSizeType)
 148       SSIZE_MAX),0);
 149     if (count <= 0)
 150       {
 151         count=0;
 152         if (errno != EINTR)
 153           break;
 154       }
 155   }
 156   return(i);
 157 }
 158
 159 static int ConnectPixelCacheServer(const char *hostname,const int port,
 160   size_t *session_key,ExceptionInfo *exception)
 161 {
 162 #if defined(MAGICKCORE_HAVE_SOCKET) && defined(MAGICKCORE_THREAD_SUPPORT)
 163   char
 164     service[MaxTextExtent];
 165
 166   const char
 167     *shared_secret;
 168
 169   int
 170     client_socket,
 171     status;
 172
 173   ssize_t
 174     count;
 175
 176   struct addrinfo
 177     hint,
 178     *result;
 179
 180   unsigned char
 181     secret[MaxTextExtent];
 182
 183   /*
 184     Connect to distributed pixel cache and get session key.
 185   */
 186   *session_key=0;
 187   shared_secret=GetPolicyValue("shared-secret");
 188   if (shared_secret == (const char *) NULL)
 189     {
 190       (void) ThrowMagickException(exception,GetMagickModule(),CacheError,
 191         "DistributedPixelCache","'%s'","shared secret expected");
 192       return(-1);
 193     }
 194   (void) ResetMagickMemory(&hint,0,sizeof(hint));
 195   hint.ai_family=AF_INET;
 196   hint.ai_socktype=SOCK_STREAM;
 197   hint.ai_flags=AI_PASSIVE;
 198   (void) FormatLocaleString(service,MaxTextExtent,"%d",port);
 199   status=getaddrinfo(hostname,service,&hint,&result);
 200   if (status != 0)
 201     {
 202       (void) ThrowMagickException(exception,GetMagickModule(),CacheError,
 203         "DistributedPixelCache","'%s'",hostname);
 204       return(-1);
 205     }
 206   client_socket=socket(result->ai_family,result->ai_socktype,
 207     result->ai_protocol);
 208   if (client_socket == -1)
 209     {
 210       (void) ThrowMagickException(exception,GetMagickModule(),CacheError,
 211         "DistributedPixelCache","'%s'",hostname);
 212       return(-1);
 213     }
 214   status=connect(client_socket,result->ai_addr,result->ai_addrlen);
 215   if (status == -1)
 216     {
 217       (void) ThrowMagickException(exception,GetMagickModule(),CacheError,
 218         "DistributedPixelCache","'%s'",hostname);
 219       return(-1);
 220     }
 221   count=recv(client_socket,secret,MaxTextExtent,0);
 222   if (count != -1)
 223     {
 224       StringInfo
 225         *nonce;
 226
 227       nonce=AcquireStringInfo(count);
 228       (void) memcpy(GetStringInfoDatum(nonce),secret,(size_t) count);
 229       *session_key=GetMagickSignature(nonce);
 230       nonce=DestroyStringInfo(nonce);
 231     }
 232   if (*session_key == 0)
 233     {
 234       close(client_socket);
 235       client_socket=(-1);
 236     }
 237   return(client_socket);
 238 #else
 239   (void) ThrowMagickException(exception,GetMagickModule(),MissingDelegateError,
 240     "DelegateLibrarySupportNotBuiltIn","distributed pixel cache");
 241   return(MagickFalse);
 242 #endif
 243 }
 244
 245 static char *GetHostname(int *port,ExceptionInfo *exception)
 246 {
 247   char
 248     *host,
 249     *hosts,
 250     **hostlist;
 251
 252   int
 253     argc;
 254
 255   register ssize_t
 256     i;
 257
 258   static size_t
 259     id = 0;
 260
 261   /*
 262     Parse host list (e.g. 192.168.100.1:6668,192.168.100.2:6668).
 263   */
 264   hosts=(char *) GetImageRegistry(StringRegistryType,"cache:hosts",
 265     exception);
 266   if (hosts == (char *) NULL)
 267     {
 268       *port=DPCPort;
 269       return(AcquireString(DPCHostname));
 270     }
 271   (void) SubstituteString(&hosts,","," ");
 272   hostlist=StringToArgv(hosts,&argc);
 273   hosts=DestroyString(hosts);
 274   if (hostlist == (char **) NULL)
 275     {
 276       *port=DPCPort;
 277       return(AcquireString(DPCHostname));
 278     }
 279   hosts=AcquireString(hostlist[(id++ % (argc-1))+1]);
 280   for (i=0; i < (ssize_t) argc; i++)
 281     hostlist[i]=DestroyString(hostlist[i]);
 282   hostlist=(char **) RelinquishMagickMemory(hostlist);
 283   (void) SubstituteString(&hosts,":"," ");
 284   hostlist=StringToArgv(hosts,&argc);
 285   if (hostlist == (char **) NULL)
 286     {
 287       *port=DPCPort;
 288       return(AcquireString(DPCHostname));
 289     }
 290   host=AcquireString(hostlist[1]);
 291   if (hostlist[2] == (char *) NULL)
 292     *port=DPCPort;
 293   else
 294     *port=StringToLong(hostlist[2]);
 295   for (i=0; i < (ssize_t) argc; i++)
 296     hostlist[i]=DestroyString(hostlist[i]);
 297   hostlist=(char **) RelinquishMagickMemory(hostlist);
 298   return(host);
 299 }
 300
 301 MagickPrivate DistributeCacheInfo *AcquireDistributeCacheInfo(
 302   ExceptionInfo *exception)
 303 {
 304   char
 305     *hostname;
 306
 307   DistributeCacheInfo
 308     *server_info;
 309
 310   size_t
 311     session_key;
 312
 313   /*
 314     Connect to the distributed pixel cache server.
 315   */
 316   server_info=(DistributeCacheInfo *) AcquireMagickMemory(sizeof(*server_info));
 317   if (server_info == (DistributeCacheInfo *) NULL)
 318     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
 319   (void) ResetMagickMemory(server_info,0,sizeof(*server_info));
 320   server_info->signature=MagickSignature;
 321   server_info->port=0;
 322   hostname=GetHostname(&server_info->port,exception);
 323   session_key=0;
 324   server_info->file=ConnectPixelCacheServer(hostname,server_info->port,
 325     &session_key,exception);
 326   server_info->session_key=session_key;
 327   (void) CopyMagickString(server_info->hostname,hostname,MaxTextExtent);
 328   hostname=DestroyString(hostname);
 329   if (server_info->file == -1)
 330     server_info=DestroyDistributeCacheInfo(server_info);
 331   server_info->debug=IsEventLogging();
 332   return(server_info);
 333 }
 334 \f
 335 /*
 336 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 337 %                                                                             %
 338 %                                                                             %
 339 %                                                                             %
 340 +   D e s t r o y D i s t r i b u t e C a c h e I n f o                       %
 341 %                                                                             %
 342 %                                                                             %
 343 %                                                                             %
 344 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 345 %
 346 %  DestroyDistributeCacheInfo() deallocates memory associated with an
 347 %  DistributeCacheInfo structure.
 348 %
 349 %  The format of the DestroyDistributeCacheInfo method is:
 350 %
 351 %      DistributeCacheInfo *DestroyDistributeCacheInfo(
 352 %        DistributeCacheInfo *server_info)
 353 %
 354 %  A description of each parameter follows:
 355 %
 356 %    o server_info: the distributed cache info.
 357 %
 358 */
 359 MagickPrivate DistributeCacheInfo *DestroyDistributeCacheInfo(
 360   DistributeCacheInfo *server_info)
 361 {
 362   assert(server_info != (DistributeCacheInfo *) NULL);
 363   assert(server_info->signature == MagickSignature);
 364   if (server_info->file > 0)
 365     (void) close(server_info->file);
 366   server_info->signature=(~MagickSignature);
 367   server_info=(DistributeCacheInfo *) RelinquishMagickMemory(server_info);
 368   return(server_info);
 369 }
 370 \f
 371 /*
 372 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 373 %                                                                             %
 374 %                                                                             %
 375 %                                                                             %
 376 +   D i s t r i b u t e P i x e l C a c h e S e r v e r                       %
 377 %                                                                             %
 378 %                                                                             %
 379 %                                                                             %
 380 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 381 %
 382 %  DistributePixelCacheServer() waits on the specified port for commands to
 383 %  create, read, update, or destroy a pixel cache.
 384 %
 385 %  The format of the DistributePixelCacheServer() method is:
 386 %
 387 %      void DistributePixelCacheServer(const int port)
 388 %
 389 %  A description of each parameter follows:
 390 %
 391 %    o port: connect the distributed pixel cache at this port.
 392 %
 393 %    o exception: return any errors or warnings in this structure.
 394 %
 395 */
 396
 397 static MagickBooleanType DestroyDistributeCache(SplayTreeInfo *registry,
 398   int magick_unused(file),const size_t session_key)
 399 {
 400   /*
 401     Destroy distributed pixel cache.
 402   */
 403   magick_unreferenced(file);
 404   return(DeleteNodeFromSplayTree(registry,(const void *) session_key));
 405 }
 406
 407 static inline MagickOffsetType dpc_send(int file,const MagickSizeType length,
 408   const unsigned char *restrict message)
 409 {
 410   MagickOffsetType
 411     count;
 412
 413   register MagickOffsetType
 414     i;
 415
 416 #if !defined(MAGICKCORE_HAVE_SOCKET) || !defined(MAGICKCORE_THREAD_SUPPORT)
 417   magick_unreferenced(file);
 418   magick_unreferenced(message);
 419 #endif
 420
 421   /*
 422     Ensure a complete message is sent.
 423   */
 424   count=0;
 425   for (i=0; i < (MagickOffsetType) length; i+=count)
 426   {
 427     count=(MagickOffsetType) send(file,message+i,(size_t) MagickMin(length-i,
 428       (MagickSizeType) SSIZE_MAX),MSG_NOSIGNAL);
 429     if (count <= 0)
 430       {
 431         count=0;
 432         if (errno != EINTR)
 433           break;
 434       }
 435   }
 436   return(i);
 437 }
 438
 439 static MagickBooleanType OpenDistributeCache(SplayTreeInfo *registry,
 440   int file,const size_t session_key,ExceptionInfo *exception)
 441 {
 442   Image
 443     *image;
 444
 445   MagickBooleanType
 446     status;
 447
 448   MagickOffsetType
 449     count;
 450
 451   MagickSizeType
 452     length;
 453
 454   register unsigned char
 455     *p;
 456
 457   unsigned char
 458     message[MaxTextExtent];
 459
 460   /*
 461     Open distributed pixel cache.
 462   */
 463   image=AcquireImage((ImageInfo *) NULL,exception);
 464   if (image == (Image *) NULL)
 465     return(MagickFalse);
 466   length=sizeof(image->storage_class)+sizeof(image->colorspace)+
 467     sizeof(image->alpha_trait)+sizeof(image->read_mask)+
 468     sizeof(image->write_mask)+sizeof(image->columns)+sizeof(image->rows)+
 469     sizeof(image->number_channels)+MaxPixelChannels*sizeof(*image->channel_map)+
 470     sizeof(image->metacontent_extent);
 471   count=dpc_read(file,length,message);
 472   if (count != (MagickOffsetType) length)
 473     return(MagickFalse);
 474   /*
 475     Deserialize the image attributes.
 476   */
 477   p=message;
 478   (void) memcpy(&image->storage_class,p,sizeof(image->storage_class));
 479   p+=sizeof(image->storage_class);
 480   (void) memcpy(&image->colorspace,p,sizeof(image->colorspace));
 481   p+=sizeof(image->colorspace);
 482   (void) memcpy(&image->alpha_trait,p,sizeof(image->alpha_trait));
 483   p+=sizeof(image->alpha_trait);
 484   (void) memcpy(&image->read_mask,p,sizeof(image->read_mask));
 485   p+=sizeof(image->read_mask);
 486   (void) memcpy(&image->write_mask,p,sizeof(image->write_mask));
 487   p+=sizeof(image->write_mask);
 488   (void) memcpy(&image->columns,p,sizeof(image->columns));
 489   p+=sizeof(image->columns);
 490   (void) memcpy(&image->rows,p,sizeof(image->rows));
 491   p+=sizeof(image->rows);
 492   (void) memcpy(&image->number_channels,p,sizeof(image->number_channels));
 493   p+=sizeof(image->number_channels);
 494   (void) memcpy(image->channel_map,p,MaxPixelChannels*
 495     sizeof(*image->channel_map));
 496   p+=MaxPixelChannels*sizeof(*image->channel_map);
 497   (void) memcpy(&image->metacontent_extent,p,sizeof(image->metacontent_extent));
 498   p+=sizeof(image->metacontent_extent);
 499   if (SyncImagePixelCache(image,exception) == MagickFalse)
 500     return(MagickFalse);
 501   status=AddValueToSplayTree(registry,(const void *) session_key,image);
 502   return(status);
 503 }
 504
 505 static MagickBooleanType ReadDistributeCacheMetacontent(SplayTreeInfo *registry,
 506   int file,const size_t session_key,ExceptionInfo *exception)
 507 {
 508   const unsigned char
 509     *metacontent;
 510
 511   Image
 512     *image;
 513
 514   MagickOffsetType
 515     count;
 516
 517   MagickSizeType
 518     length;
 519
 520   RectangleInfo
 521     region;
 522
 523   register const Quantum
 524     *p;
 525
 526   register unsigned char
 527     *q;
 528
 529   unsigned char
 530     message[MaxTextExtent];
 531
 532   /*
 533     Read distributed pixel cache metacontent.
 534   */
 535   image=(Image *) GetValueFromSplayTree(registry,(const void *) session_key);
 536   if (image == (Image *) NULL)
 537     return(MagickFalse);
 538   length=sizeof(region.width)+sizeof(region.height)+sizeof(region.x)+
 539     sizeof(region.y)+sizeof(length);
 540   count=dpc_read(file,length,message);
 541   if (count != (MagickOffsetType) length)
 542     return(MagickFalse);
 543   q=message;
 544   (void) memcpy(&region.width,q,sizeof(region.width));
 545   q+=sizeof(region.width);
 546   (void) memcpy(&region.height,q,sizeof(region.height));
 547   q+=sizeof(region.height);
 548   (void) memcpy(&region.x,q,sizeof(region.x));
 549   q+=sizeof(region.x);
 550   (void) memcpy(&region.y,q,sizeof(region.y));
 551   q+=sizeof(region.y);
 552   (void) memcpy(&length,q,sizeof(length));
 553   q+=sizeof(length);
 554   p=GetVirtualPixels(image,region.x,region.y,region.width,region.height,
 555     exception);
 556   if (p == (const Quantum *) NULL)
 557     return(MagickFalse);
 558   metacontent=(const unsigned char *) GetVirtualMetacontent(image);
 559   count=dpc_send(file,length,metacontent);
 560   if (count != (MagickOffsetType) length)
 561     return(MagickFalse);
 562   return(MagickTrue);
 563 }
 564
 565 static MagickBooleanType ReadDistributeCachePixels(SplayTreeInfo *registry,
 566   int file,const size_t session_key,ExceptionInfo *exception)
 567 {
 568   Image
 569     *image;
 570
 571   MagickOffsetType
 572     count;
 573
 574   MagickSizeType
 575     length;
 576
 577   RectangleInfo
 578     region;
 579
 580   register const Quantum
 581     *p;
 582
 583   register unsigned char
 584     *q;
 585
 586   unsigned char
 587     message[MaxTextExtent];
 588
 589   /*
 590     Read distributed pixel cache pixels.
 591   */
 592   image=(Image *) GetValueFromSplayTree(registry,(const void *) session_key);
 593   if (image == (Image *) NULL)
 594     return(MagickFalse);
 595   length=sizeof(region.width)+sizeof(region.height)+sizeof(region.x)+
 596     sizeof(region.y)+sizeof(length);
 597   count=dpc_read(file,length,message);
 598   if (count != (MagickOffsetType) length)
 599     return(MagickFalse);
 600   q=message;
 601   (void) memcpy(&region.width,q,sizeof(region.width));
 602   q+=sizeof(region.width);
 603   (void) memcpy(&region.height,q,sizeof(region.height));
 604   q+=sizeof(region.height);
 605   (void) memcpy(&region.x,q,sizeof(region.x));
 606   q+=sizeof(region.x);
 607   (void) memcpy(&region.y,q,sizeof(region.y));
 608   q+=sizeof(region.y);
 609   (void) memcpy(&length,q,sizeof(length));
 610   q+=sizeof(length);
 611   p=GetVirtualPixels(image,region.x,region.y,region.width,region.height,
 612     exception);
 613   if (p == (const Quantum *) NULL)
 614     return(MagickFalse);
 615   count=dpc_send(file,length,(unsigned char *) p);
 616   if (count != (MagickOffsetType) length)
 617     return(MagickFalse);
 618   return(MagickTrue);
 619 }
 620
 621 static void *RelinquishImageRegistry(void *image)
 622 {
 623   return((void *) DestroyImageList((Image *) image));
 624 }
 625
 626 static MagickBooleanType WriteDistributeCacheMetacontent(
 627   SplayTreeInfo *registry,int file,const size_t session_key,
 628   ExceptionInfo *exception)
 629 {
 630   Image
 631     *image;
 632
 633   MagickOffsetType
 634     count;
 635
 636   MagickSizeType
 637     length;
 638
 639   RectangleInfo
 640     region;
 641
 642   register Quantum
 643     *q;
 644
 645   register unsigned char
 646     *p;
 647
 648   unsigned char
 649     message[MaxTextExtent],
 650     *metacontent;
 651
 652   /*
 653     Write distributed pixel cache metacontent.
 654   */
 655   image=(Image *) GetValueFromSplayTree(registry,(const void *) session_key);
 656   if (image == (Image *) NULL)
 657     return(MagickFalse);
 658   length=sizeof(region.width)+sizeof(region.height)+sizeof(region.x)+
 659     sizeof(region.y)+sizeof(length);
 660   count=dpc_read(file,length,message);
 661   if (count != (MagickOffsetType) length)
 662     return(MagickFalse);
 663   p=message;
 664   (void) memcpy(&region.width,p,sizeof(region.width));
 665   p+=sizeof(region.width);
 666   (void) memcpy(&region.height,p,sizeof(region.height));
 667   p+=sizeof(region.height);
 668   (void) memcpy(&region.x,p,sizeof(region.x));
 669   p+=sizeof(region.x);
 670   (void) memcpy(&region.y,p,sizeof(region.y));
 671   p+=sizeof(region.y);
 672   (void) memcpy(&length,p,sizeof(length));
 673   p+=sizeof(length);
 674   q=GetAuthenticPixels(image,region.x,region.y,region.width,region.height,
 675     exception);
 676   if (q == (Quantum *) NULL)
 677     return(MagickFalse);
 678   metacontent=(unsigned char *) GetAuthenticMetacontent(image);
 679   count=dpc_read(file,length,metacontent);
 680   if (count != (MagickOffsetType) length)
 681     return(MagickFalse);
 682   return(SyncAuthenticPixels(image,exception));
 683 }
 684
 685 static MagickBooleanType WriteDistributeCachePixels(SplayTreeInfo *registry,
 686   int file,const size_t session_key,ExceptionInfo *exception)
 687 {
 688   Image
 689     *image;
 690
 691   MagickOffsetType
 692     count;
 693
 694   MagickSizeType
 695     length;
 696
 697   RectangleInfo
 698     region;
 699
 700   register Quantum
 701     *q;
 702
 703   register unsigned char
 704     *p;
 705
 706   unsigned char
 707     message[MaxTextExtent];
 708
 709   /*
 710     Write distributed pixel cache pixels.
 711   */
 712   image=(Image *) GetValueFromSplayTree(registry,(const void *) session_key);
 713   if (image == (Image *) NULL)
 714     return(MagickFalse);
 715   length=sizeof(region.width)+sizeof(region.height)+sizeof(region.x)+
 716     sizeof(region.y)+sizeof(length);
 717   count=dpc_read(file,length,message);
 718   if (count != (MagickOffsetType) length)
 719     return(MagickFalse);
 720   p=message;
 721   (void) memcpy(&region.width,p,sizeof(region.width));
 722   p+=sizeof(region.width);
 723   (void) memcpy(&region.height,p,sizeof(region.height));
 724   p+=sizeof(region.height);
 725   (void) memcpy(&region.x,p,sizeof(region.x));
 726   p+=sizeof(region.x);
 727   (void) memcpy(&region.y,p,sizeof(region.y));
 728   p+=sizeof(region.y);
 729   (void) memcpy(&length,p,sizeof(length));
 730   p+=sizeof(length);
 731   q=GetAuthenticPixels(image,region.x,region.y,region.width,region.height,
 732     exception);
 733   if (q == (Quantum *) NULL)
 734     return(MagickFalse);
 735   count=dpc_read(file,length,(unsigned char *) q);
 736   if (count != (MagickOffsetType) length)
 737     return(MagickFalse);
 738   return(SyncAuthenticPixels(image,exception));
 739 }
 740
 741 static void *DistributePixelCacheClient(void *socket)
 742 {
 743   const char
 744     *shared_secret;
 745
 746   ExceptionInfo
 747     *exception;
 748
 749   int
 750     client_socket;
 751
 752   MagickBooleanType
 753     status;
 754
 755   MagickOffsetType
 756     count;
 757
 758   register unsigned char
 759     *p;
 760
 761   RandomInfo
 762     *random_info;
 763
 764   size_t
 765     key,
 766     session_key;
 767
 768   SplayTreeInfo
 769     *registry;
 770
 771   StringInfo
 772     *secret;
 773
 774   unsigned char
 775     command,
 776     session[2*MaxTextExtent];
 777
 778   /*
 779     Distributed pixel cache client.
 780   */
 781   shared_secret=GetPolicyValue("shared-secret");
 782   if (shared_secret == (const char *) NULL)
 783     ThrowFatalException(CacheFatalError,"shared secret expected");
 784   p=session;
 785   (void) CopyMagickString((char *) p,shared_secret,MaxTextExtent);
 786   p+=strlen(shared_secret);
 787   random_info=AcquireRandomInfo();
 788   secret=GetRandomKey(random_info,DPCSessionKeyLength);
 789   (void) memcpy(p,GetStringInfoDatum(secret),DPCSessionKeyLength);
 790   session_key=GetMagickSignature(secret);
 791   random_info=DestroyRandomInfo(random_info);
 792   exception=AcquireExceptionInfo();
 793   registry=NewSplayTree((int (*)(const void *,const void *)) NULL,
 794     (void *(*)(void *)) NULL,RelinquishImageRegistry);
 795   client_socket=(*(int *) socket);
 796   count=dpc_send(client_socket,DPCSessionKeyLength,GetStringInfoDatum(secret));
 797   secret=DestroyStringInfo(secret);
 798   for ( ; ; )
 799   {
 800     count=dpc_read(client_socket,1,(unsigned char *) &command);
 801     if (count <= 0)
 802       break;
 803     count=dpc_read(client_socket,sizeof(key),(unsigned char *) &key);
 804     if ((count != (MagickOffsetType) sizeof(key)) || (key != session_key))
 805       break;
 806     status=MagickFalse;
 807     switch (command)
 808     {
 809       case 'o':
 810       {
 811         status=OpenDistributeCache(registry,client_socket,session_key,
 812           exception);
 813         count=dpc_send(client_socket,sizeof(status),(unsigned char *) &status);
 814         break;
 815       }
 816       case 'r':
 817       {
 818         status=ReadDistributeCachePixels(registry,client_socket,session_key,
 819           exception);
 820         break;
 821       }
 822       case 'R':
 823       {
 824         status=ReadDistributeCacheMetacontent(registry,client_socket,
 825           session_key,exception);
 826         break;
 827       }
 828       case 'w':
 829       {
 830         status=WriteDistributeCachePixels(registry,client_socket,session_key,
 831           exception);
 832         break;
 833       }
 834       case 'W':
 835       {
 836         status=WriteDistributeCacheMetacontent(registry,client_socket,
 837           session_key,exception);
 838         break;
 839       }
 840       case 'd':
 841       {
 842         status=DestroyDistributeCache(registry,client_socket,session_key);
 843         break;
 844       }
 845       default:
 846         break;
 847     }
 848     if (status == MagickFalse)
 849       break;
 850     if (command == 'd')
 851       break;
 852   }
 853   count=dpc_send(client_socket,sizeof(status),(unsigned char *) &status);
 854   (void) close(client_socket);
 855   exception=DestroyExceptionInfo(exception);
 856   registry=DestroySplayTree(registry);
 857   return((void *) NULL);
 858 }
 859
 860 MagickExport void DistributePixelCacheServer(const int port,
 861   ExceptionInfo *exception)
 862 {
 863 #if defined(MAGICKCORE_HAVE_SOCKET) && defined(MAGICKCORE_THREAD_SUPPORT)
 864   char
 865     service[MaxTextExtent];
 866
 867   int
 868     server_socket,
 869     status;
 870
 871   pthread_attr_t
 872     attributes;
 873
 874   pthread_t
 875     threads;
 876
 877   register struct addrinfo
 878     *p;
 879
 880   struct addrinfo
 881     hint,
 882     *result;
 883
 884   struct sockaddr_in
 885     address;
 886
 887   /*
 888     Launch distributed pixel cache server.
 889   */
 890   assert(exception != (ExceptionInfo *) NULL);
 891   assert(exception->signature == MagickSignature);
 892   (void) ResetMagickMemory(&hint,0,sizeof(hint));
 893   hint.ai_family=AF_INET;
 894   hint.ai_socktype=SOCK_STREAM;
 895   hint.ai_flags=AI_PASSIVE;
 896   (void) FormatLocaleString(service,MaxTextExtent,"%d",port);
 897   status=getaddrinfo((const char *) NULL,service,&hint,&result);
 898   if (status != 0)
 899     ThrowFatalException(CacheFatalError,"UnableToListen");
 900   server_socket=0;
 901   for (p=result; p != (struct addrinfo *) NULL; p=p->ai_next)
 902   {
 903     int
 904       one;
 905
 906     server_socket=socket(p->ai_family,p->ai_socktype,p->ai_protocol);
 907     if (server_socket == -1)
 908       continue;
 909     one=1;
 910     status=setsockopt(server_socket,SOL_SOCKET,SO_REUSEADDR,&one,(socklen_t)
 911       sizeof(one));
 912     if (status == -1)
 913       continue;
 914     status=bind(server_socket,p->ai_addr,p->ai_addrlen);
 915     if (status == -1)
 916       {
 917         (void) close(status);
 918         continue;
 919       }
 920     break;
 921   }
 922   if (p == (struct addrinfo *) NULL)
 923     ThrowFatalException(CacheFatalError,"UnableToBind");
 924   freeaddrinfo(result);
 925   status=listen(server_socket,DPCPendingConnections);
 926   if (status != 0)
 927     ThrowFatalException(CacheFatalError,"UnableToListen");
 928   pthread_attr_init(&attributes);
 929   for ( ; ; )
 930   {
 931     int
 932       client_socket;
 933
 934     socklen_t
 935       length;
 936
 937     length=(socklen_t) sizeof(address);
 938     client_socket=accept(server_socket,(struct sockaddr *) &address,&length);
 939     if (client_socket == -1)
 940       ThrowFatalException(CacheFatalError,"UnableToEstablishConnection");
 941     status=pthread_create(&threads,&attributes,DistributePixelCacheClient,
 942       (void *) &client_socket);
 943     if (status == -1)
 944       ThrowFatalException(CacheFatalError,"UnableToCreateClientThread");
 945   }
 946   (void) close(server_socket);
 947 #else
 948   ThrowFatalException(MissingDelegateError,"distributed pixel cache");
 949 #endif
 950 }
 951 \f
 952 /*
 953 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 954 %                                                                             %
 955 %                                                                             %
 956 %                                                                             %
 957 +   G e t D i s t r i b u t e C a c h e F i l e                               %
 958 %                                                                             %
 959 %                                                                             %
 960 %                                                                             %
 961 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 962 %
 963 %  GetDistributeCacheFile() returns the file associated with this
 964 %  DistributeCacheInfo structure.
 965 %
 966 %  The format of the GetDistributeCacheFile method is:
 967 %
 968 %      int GetDistributeCacheFile(const DistributeCacheInfo *server_info)
 969 %
 970 %  A description of each parameter follows:
 971 %
 972 %    o server_info: the distributed cache info.
 973 %
 974 */
 975 MagickPrivate int GetDistributeCacheFile(const DistributeCacheInfo *server_info)
 976 {
 977   assert(server_info != (DistributeCacheInfo *) NULL);
 978   assert(server_info->signature == MagickSignature);
 979   return(server_info->file);
 980 }
 981 \f
 982 /*
 983 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 984 %                                                                             %
 985 %                                                                             %
 986 %                                                                             %
 987 +   G e t D i s t r i b u t e C a c h e H o s t n a m e                       %
 988 %                                                                             %
 989 %                                                                             %
 990 %                                                                             %
 991 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 992 %
 993 %  GetDistributeCacheHostname() returns the hostname associated with this
 994 %  DistributeCacheInfo structure.
 995 %
 996 %  The format of the GetDistributeCacheHostname method is:
 997 %
 998 %      const char *GetDistributeCacheHostname(
 999 %        const DistributeCacheInfo *server_info)
1000 %
1001 %  A description of each parameter follows:
1002 %
1003 %    o server_info: the distributed cache info.
1004 %
1005 */
1006 MagickPrivate const char *GetDistributeCacheHostname(
1007   const DistributeCacheInfo *server_info)
1008 {
1009   assert(server_info != (DistributeCacheInfo *) NULL);
1010   assert(server_info->signature == MagickSignature);
1011   return(server_info->hostname);
1012 }
1013 \f
1014 /*
1015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1016 %                                                                             %
1017 %                                                                             %
1018 %                                                                             %
1019 +   G e t D i s t r i b u t e C a c h e P o r t                               %
1020 %                                                                             %
1021 %                                                                             %
1022 %                                                                             %
1023 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1024 %
1025 %  GetDistributeCachePort() returns the port associated with this
1026 %  DistributeCacheInfo structure.
1027 %
1028 %  The format of the GetDistributeCachePort method is:
1029 %
1030 %      int GetDistributeCachePort(const DistributeCacheInfo *server_info)
1031 %
1032 %  A description of each parameter follows:
1033 %
1034 %    o server_info: the distributed cache info.
1035 %
1036 */
1037 MagickPrivate int GetDistributeCachePort(const DistributeCacheInfo *server_info)
1038 {
1039   assert(server_info != (DistributeCacheInfo *) NULL);
1040   assert(server_info->signature == MagickSignature);
1041   return(server_info->port);
1042 }
1043 \f
1044 /*
1045 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1046 %                                                                             %
1047 %                                                                             %
1048 %                                                                             %
1049 +   O p e n D i s t r i b u t e P i x e l C a c h e                           %
1050 %                                                                             %
1051 %                                                                             %
1052 %                                                                             %
1053 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1054 %
1055 %  OpenDistributePixelCache() opens a pixel cache on a remote server.
1056 %
1057 %  The format of the OpenDistributePixelCache method is:
1058 %
1059 %      MagickBooleanType *OpenDistributePixelCache(
1060 %        DistributeCacheInfo *server_info,Image *image)
1061 %
1062 %  A description of each parameter follows:
1063 %
1064 %    o server_info: the distributed cache info.
1065 %
1066 %    o image: the image.
1067 %
1068 */
1069 MagickPrivate MagickBooleanType OpenDistributePixelCache(
1070   DistributeCacheInfo *server_info,Image *image)
1071 {
1072   MagickBooleanType
1073     status;
1074
1075   MagickOffsetType
1076     count;
1077
1078   register unsigned char
1079     *p;
1080
1081   unsigned char
1082     message[MaxTextExtent];
1083
1084   /*
1085     Open distributed pixel cache.
1086   */
1087   assert(server_info != (DistributeCacheInfo *) NULL);
1088   assert(server_info->signature == MagickSignature);
1089   assert(image != (Image *) NULL);
1090   assert(image->signature == MagickSignature);
1091   p=message;
1092   *p++='o';  /* open */
1093   /*
1094     Serialize image attributes (see ValidatePixelCacheMorphology()).
1095   */
1096   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1097   p+=sizeof(server_info->session_key);
1098   (void) memcpy(p,&image->storage_class,sizeof(image->storage_class));
1099   p+=sizeof(image->storage_class);
1100   (void) memcpy(p,&image->colorspace,sizeof(image->colorspace));
1101   p+=sizeof(image->colorspace);
1102   (void) memcpy(p,&image->alpha_trait,sizeof(image->alpha_trait));
1103   p+=sizeof(image->alpha_trait);
1104   (void) memcpy(p,&image->read_mask,sizeof(image->read_mask));
1105   p+=sizeof(image->read_mask);
1106   (void) memcpy(p,&image->write_mask,sizeof(image->write_mask));
1107   p+=sizeof(image->write_mask);
1108   (void) memcpy(p,&image->columns,sizeof(image->columns));
1109   p+=sizeof(image->columns);
1110   (void) memcpy(p,&image->rows,sizeof(image->rows));
1111   p+=sizeof(image->rows);
1112   (void) memcpy(p,&image->number_channels,sizeof(image->number_channels));
1113   p+=sizeof(image->number_channels);
1114   (void) memcpy(p,image->channel_map,MaxPixelChannels*
1115     sizeof(*image->channel_map));
1116   p+=MaxPixelChannels*sizeof(*image->channel_map);
1117   (void) memcpy(p,&image->metacontent_extent,sizeof(image->metacontent_extent));
1118   p+=sizeof(image->metacontent_extent);
1119   count=dpc_send(server_info->file,p-message,message);
1120   if (count != (MagickOffsetType) (p-message))
1121     return(MagickFalse);
1122   status=MagickFalse;
1123   count=dpc_read(server_info->file,sizeof(status),(unsigned char *) &status);
1124   if (count != (MagickOffsetType) sizeof(status))
1125     return(MagickFalse);
1126   return(status);
1127 }
1128 \f
1129 /*
1130 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1131 %                                                                             %
1132 %                                                                             %
1133 %                                                                             %
1134 +   R e a d D i s t r i b u t e P i x e l C a c h e M e t a c o n t e n t     %
1135 %                                                                             %
1136 %                                                                             %
1137 %                                                                             %
1138 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1139 %
1140 %  ReadDistributePixelCacheMetacontents() reads metacontent from the specified
1141 %  region of the distributed pixel cache.
1142 %
1143 %  The format of the ReadDistributePixelCacheMetacontents method is:
1144 %
1145 %      MagickOffsetType ReadDistributePixelCacheMetacontents(
1146 %        DistributeCacheInfo *server_info,const RectangleInfo *region,
1147 %        const MagickSizeType length,unsigned char *metacontent)
1148 %
1149 %  A description of each parameter follows:
1150 %
1151 %    o server_info: the distributed cache info.
1152 %
1153 %    o image: the image.
1154 %
1155 %    o region: read the metacontent from this region of the image.
1156 %
1157 %    o length: the length in bytes of the metacontent.
1158 %
1159 %    o metacontent: read these metacontent from the pixel cache.
1160 %
1161 */
1162 MagickPrivate MagickOffsetType ReadDistributePixelCacheMetacontent(
1163   DistributeCacheInfo *server_info,const RectangleInfo *region,
1164   const MagickSizeType length,unsigned char *metacontent)
1165 {
1166   MagickOffsetType
1167     count;
1168
1169   register unsigned char
1170     *p;
1171
1172   unsigned char
1173     message[MaxTextExtent];
1174
1175   /*
1176     Read distributed pixel cache metacontent.
1177   */
1178   assert(server_info != (DistributeCacheInfo *) NULL);
1179   assert(server_info->signature == MagickSignature);
1180   assert(region != (RectangleInfo *) NULL);
1181   assert(metacontent != (unsigned char *) NULL);
1182   if (length > (MagickSizeType) SSIZE_MAX)
1183     return(-1);
1184   p=message;
1185   *p++='R';
1186   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1187   p+=sizeof(server_info->session_key);
1188   (void) memcpy(p,&region->width,sizeof(region->width));
1189   p+=sizeof(region->width);
1190   (void) memcpy(p,&region->height,sizeof(region->height));
1191   p+=sizeof(region->height);
1192   (void) memcpy(p,&region->x,sizeof(region->x));
1193   p+=sizeof(region->x);
1194   (void) memcpy(p,&region->y,sizeof(region->y));
1195   p+=sizeof(region->y);
1196   (void) memcpy(p,&length,sizeof(length));
1197   p+=sizeof(length);
1198   count=dpc_send(server_info->file,p-message,message);
1199   if (count != (MagickOffsetType) (p-message))
1200     return(-1);
1201   return(dpc_read(server_info->file,length,metacontent));
1202 }
1203 \f
1204 /*
1205 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1206 %                                                                             %
1207 %                                                                             %
1208 %                                                                             %
1209 +   R e a d D i s t r i b u t e P i x e l C a c h e P i x e l s               %
1210 %                                                                             %
1211 %                                                                             %
1212 %                                                                             %
1213 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1214 %
1215 %  ReadDistributePixelCachePixels() reads pixels from the specified region of
1216 %  the distributed pixel cache.
1217 %
1218 %  The format of the ReadDistributePixelCachePixels method is:
1219 %
1220 %      MagickOffsetType ReadDistributePixelCachePixels(
1221 %        DistributeCacheInfo *server_info,const RectangleInfo *region,
1222 %        const MagickSizeType length,unsigned char *restrict pixels)
1223 %
1224 %  A description of each parameter follows:
1225 %
1226 %    o server_info: the distributed cache info.
1227 %
1228 %    o image: the image.
1229 %
1230 %    o region: read the pixels from this region of the image.
1231 %
1232 %    o length: the length in bytes of the pixels.
1233 %
1234 %    o pixels: read these pixels from the pixel cache.
1235 %
1236 */
1237 MagickPrivate MagickOffsetType ReadDistributePixelCachePixels(
1238   DistributeCacheInfo *server_info,const RectangleInfo *region,
1239   const MagickSizeType length,unsigned char *restrict pixels)
1240 {
1241   MagickOffsetType
1242     count;
1243
1244   register unsigned char
1245     *p;
1246
1247   unsigned char
1248     message[MaxTextExtent];
1249
1250   /*
1251     Read distributed pixel cache pixels.
1252   */
1253   assert(server_info != (DistributeCacheInfo *) NULL);
1254   assert(server_info->signature == MagickSignature);
1255   assert(region != (RectangleInfo *) NULL);
1256   assert(pixels != (unsigned char *) NULL);
1257   if (length > (MagickSizeType) SSIZE_MAX)
1258     return(-1);
1259   p=message;
1260   *p++='r';
1261   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1262   p+=sizeof(server_info->session_key);
1263   (void) memcpy(p,&region->width,sizeof(region->width));
1264   p+=sizeof(region->width);
1265   (void) memcpy(p,&region->height,sizeof(region->height));
1266   p+=sizeof(region->height);
1267   (void) memcpy(p,&region->x,sizeof(region->x));
1268   p+=sizeof(region->x);
1269   (void) memcpy(p,&region->y,sizeof(region->y));
1270   p+=sizeof(region->y);
1271   (void) memcpy(p,&length,sizeof(length));
1272   p+=sizeof(length);
1273   count=dpc_send(server_info->file,p-message,message);
1274   if (count != (MagickOffsetType) (p-message))
1275     return(-1);
1276   return(dpc_read(server_info->file,length,pixels));
1277 }
1278 \f
1279 /*
1280 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1281 %                                                                             %
1282 %                                                                             %
1283 %                                                                             %
1284 +   R e l i n q u i s h D i s t r i b u t e P i x e l C a c h e               %
1285 %                                                                             %
1286 %                                                                             %
1287 %                                                                             %
1288 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1289 %
1290 %  RelinquishDistributePixelCache() frees resources acquired with
1291 %  OpenDistributePixelCache().
1292 %
1293 %  The format of the RelinquishDistributePixelCache method is:
1294 %
1295 %      MagickBooleanType RelinquishDistributePixelCache(
1296 %        DistributeCacheInfo *server_info)
1297 %
1298 %  A description of each parameter follows:
1299 %
1300 %    o server_info: the distributed cache info.
1301 %
1302 */
1303 MagickPrivate MagickBooleanType RelinquishDistributePixelCache(
1304   DistributeCacheInfo *server_info)
1305 {
1306   MagickBooleanType
1307     status;
1308
1309   MagickOffsetType
1310     count;
1311
1312   register unsigned char
1313     *p;
1314
1315   unsigned char
1316     message[MaxTextExtent];
1317
1318   /*
1319     Delete distributed pixel cache.
1320   */
1321   assert(server_info != (DistributeCacheInfo *) NULL);
1322   assert(server_info->signature == MagickSignature);
1323   p=message;
1324   *p++='d';
1325   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1326   p+=sizeof(server_info->session_key);
1327   count=dpc_send(server_info->file,p-message,message);
1328   if (count != (MagickOffsetType) (p-message))
1329     return(MagickFalse);
1330   count=dpc_read(server_info->file,sizeof(status),(unsigned char *) &status);
1331   if (count != (MagickOffsetType) sizeof(status))
1332     return(MagickFalse);
1333   return(status);
1334 }
1335 \f
1336 /*
1337 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1338 %                                                                             %
1339 %                                                                             %
1340 %                                                                             %
1341 +   W r i t e D i s t r i b u t e P i x e l C a c h e M e t a c o n t e n t   %
1342 %                                                                             %
1343 %                                                                             %
1344 %                                                                             %
1345 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1346 %
1347 %  WriteDistributePixelCacheMetacontents() writes image metacontent to the
1348 %  specified region of the distributed pixel cache.
1349 %
1350 %  The format of the WriteDistributePixelCacheMetacontents method is:
1351 %
1352 %      MagickOffsetType WriteDistributePixelCacheMetacontents(
1353 %        DistributeCacheInfo *server_info,const RectangleInfo *region,
1354 %        const MagickSizeType length,const unsigned char *metacontent)
1355 %
1356 %  A description of each parameter follows:
1357 %
1358 %    o server_info: the distributed cache info.
1359 %
1360 %    o image: the image.
1361 %
1362 %    o region: write the metacontent to this region of the image.
1363 %
1364 %    o length: the length in bytes of the metacontent.
1365 %
1366 %    o metacontent: write these metacontent to the pixel cache.
1367 %
1368 */
1369 MagickPrivate MagickOffsetType WriteDistributePixelCacheMetacontent(
1370   DistributeCacheInfo *server_info,const RectangleInfo *region,
1371   const MagickSizeType length,const unsigned char *metacontent)
1372 {
1373   MagickOffsetType
1374     count;
1375
1376   register unsigned char
1377     *p;
1378
1379   unsigned char
1380     message[MaxTextExtent];
1381
1382   /*
1383     Write distributed pixel cache metacontent.
1384   */
1385   assert(server_info != (DistributeCacheInfo *) NULL);
1386   assert(server_info->signature == MagickSignature);
1387   assert(region != (RectangleInfo *) NULL);
1388   assert(metacontent != (unsigned char *) NULL);
1389   if (length > (MagickSizeType) SSIZE_MAX)
1390     return(-1);
1391   p=message;
1392   *p++='W';
1393   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1394   p+=sizeof(server_info->session_key);
1395   (void) memcpy(p,&region->width,sizeof(region->width));
1396   p+=sizeof(region->width);
1397   (void) memcpy(p,&region->height,sizeof(region->height));
1398   p+=sizeof(region->height);
1399   (void) memcpy(p,&region->x,sizeof(region->x));
1400   p+=sizeof(region->x);
1401   (void) memcpy(p,&region->y,sizeof(region->y));
1402   p+=sizeof(region->y);
1403   (void) memcpy(p,&length,sizeof(length));
1404   p+=sizeof(length);
1405   count=dpc_send(server_info->file,p-message,message);
1406   if (count != (MagickOffsetType) (p-message))
1407     return(-1);
1408   return(dpc_send(server_info->file,length,metacontent));
1409 }
1410 \f
1411 /*
1412 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1413 %                                                                             %
1414 %                                                                             %
1415 %                                                                             %
1416 +   W r i t e D i s t r i b u t e P i x e l C a c h e P i x e l s             %
1417 %                                                                             %
1418 %                                                                             %
1419 %                                                                             %
1420 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1421 %
1422 %  WriteDistributePixelCachePixels() writes image pixels to the specified
1423 %  region of the distributed pixel cache.
1424 %
1425 %  The format of the WriteDistributePixelCachePixels method is:
1426 %
1427 %      MagickBooleanType WriteDistributePixelCachePixels(
1428 %        DistributeCacheInfo *server_info,const RectangleInfo *region,
1429 %        const MagickSizeType length,const unsigned char *restrict pixels)
1430 %
1431 %  A description of each parameter follows:
1432 %
1433 %    o server_info: the distributed cache info.
1434 %
1435 %    o image: the image.
1436 %
1437 %    o region: write the pixels to this region of the image.
1438 %
1439 %    o length: the length in bytes of the pixels.
1440 %
1441 %    o pixels: write these pixels to the pixel cache.
1442 %
1443 */
1444 MagickPrivate MagickOffsetType WriteDistributePixelCachePixels(
1445   DistributeCacheInfo *server_info,const RectangleInfo *region,
1446   const MagickSizeType length,const unsigned char *restrict pixels)
1447 {
1448   MagickOffsetType
1449     count;
1450
1451   register unsigned char
1452     *p;
1453
1454   unsigned char
1455     message[MaxTextExtent];
1456
1457   /*
1458     Write distributed pixel cache pixels.
1459   */
1460   assert(server_info != (DistributeCacheInfo *) NULL);
1461   assert(server_info->signature == MagickSignature);
1462   assert(region != (RectangleInfo *) NULL);
1463   assert(pixels != (const unsigned char *) NULL);
1464   if (length > (MagickSizeType) SSIZE_MAX)
1465     return(-1);
1466   p=message;
1467   *p++='w';
1468   (void) memcpy(p,&server_info->session_key,sizeof(server_info->session_key));
1469   p+=sizeof(server_info->session_key);
1470   (void) memcpy(p,&region->width,sizeof(region->width));
1471   p+=sizeof(region->width);
1472   (void) memcpy(p,&region->height,sizeof(region->height));
1473   p+=sizeof(region->height);
1474   (void) memcpy(p,&region->x,sizeof(region->x));
1475   p+=sizeof(region->x);
1476   (void) memcpy(p,&region->y,sizeof(region->y));
1477   p+=sizeof(region->y);
1478   (void) memcpy(p,&length,sizeof(length));
1479   p+=sizeof(length);
1480   count=dpc_send(server_info->file,p-message,message);
1481   if (count != (MagickOffsetType) (p-message))
1482     return(-1);
1483   return(dpc_send(server_info->file,length,pixels));
1484 }