app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2 =begin
   3   require 'stringio'
   4
   5 # to log:
   6 # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   7
   8   # ====================================================================
   9   # Main AMF handler
  10
  11   # ---- talk   process AMF request
  12
  13   def talk
  14         req=StringIO.new(request.raw_post)      # Get POST data as request
  15         req.read(2)                                                     # Skip version indicator and client ID
  16         results={}                                                      # Results of each body
  17
  18         # -------------
  19         # Parse request
  20
  21         headers=getint(req)                                     # Read number of headers
  22         for i in (1..headers)                           # Read each header
  23                 name=getstring(req)                             #  |
  24                 req.getc                                                #  | skip boolean
  25                 value=getvalue(req)                             #  |
  26                 header["name"]=value                    #  |
  27         end
  28
  29         bodies=getint(req)                                      # Read number of bodies
  30         for i in (1..bodies)                            # Read each body
  31                 message=getstring(req)                  #  | get message name
  32                 index=getstring(req)                    #  | get index in response sequence
  33                 bytes=getlong(req)                              #  | get total size in bytes
  34                 args=getvalue(req)                              #  | get response (probably an array)
  35
  36                 case message
  37                         when 'getpresets';      results[index]=putdata(index,getpresets)
  38                         when 'whichways';       results[index]=putdata(index,whichways(args))
  39                         when 'getway';          results[index]=putdata(index,getway(args))
  40                         when 'putway';          results[index]=putdata(index,putway(args))
  41                         when 'deleteway';       results[index]=putdata(index,deleteway(args))
  42                 end
  43         end
  44
  45         # ------------------
  46         # Write out response
  47
  48         response.headers["Content-Type"]="application/x-amf"
  49         a,b=results.length.divmod(256)
  50         ans=0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  51         results.each do |k,v|
  52                 ans+=v
  53         end
  54         render :text=>ans
  55
  56   end
  57
  58
  59         # ====================================================================
  60         # Remote calls
  61
  62         # ----- getpresets
  63         #               return presets,presetmenus and presetnames arrays
  64
  65         def getpresets
  66                 presets={}
  67                 presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
  68                 presetnames={}; presetnames['point']={}; presetnames['way']={}
  69                 presettype=''
  70                 presetcategory=''
  71
  72                 File.open("config/potlatch/presets.txt") do |file|
  73                         file.each_line {|line|
  74                                 t=line.chomp
  75                                 if (t=~/(\w+)\/(\w+)/) then
  76                                         presettype=$1
  77                                         presetcategory=$2
  78                                         presetmenus[presettype].push(presetcategory)
  79                                         presetnames[presettype][presetcategory]=["(no preset)"]
  80                                 elsif (t=~/^(.+):\s?(.+)$/) then
  81                                         pre=$1; kv=$2
  82                                         presetnames[presettype][presetcategory].push(pre)
  83                                         presets[pre]={}
  84                                         kv.split(',').each {|a|
  85                                                 if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
  86                                         }
  87                                 end
  88                         }
  89                 end
  90                 [presets,presetmenus,presetnames]
  91         end
  92
  93         # ----- whichways(left,bottom,right,top)
  94         #               return array of ways in current bounding box
  95         #               at present, instead of using correct (=more complex) SQL to find
  96         #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
  97
  98         def whichways(args)
  99                 waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 100                          "  FROM current_way_segments,current_segments,current_nodes "+
 101                          " WHERE segment_id=current_segments.id "+
 102                          "   AND current_segments.visible=1 "+
 103                          "   AND node_a=current_nodes.id "+
 104                          "   AND (latitude  BETWEEN "+(args[1].to_f-0.01).to_s+" AND "+(args[3].to_f+0.01).to_s+") "+
 105                          "   AND (longitude BETWEEN "+(args[0].to_f-0.01).to_s+" AND "+(args[2].to_f+0.01).to_s+")")
 106                 ways=[]
 107                 waylist.each {|a|
 108                         ways<<a.wayid.to_i
 109                 }
 110                 ways
 111         end
 112
 113         # ----- getway (objectname, way, baselong, basey, masterscale)
 114         #               returns objectname, array of co-ordinates, attributes,
 115         #                               xmin,xmax,ymin,ymax
 116
 117         def getway(args)
 118                 objname,wayid,baselong,basey,masterscale=args
 119                 wayid=wayid.to_i
 120                 points=[]
 121                 lastid=-1
 122                 xmin=999999; xmax=-999999
 123                 ymin=999999; ymax=-999999
 124
 125                 readwayquery(wayid).each {|row|
 126                         xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 127                         xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 128                         if (row['id1'].to_i!=lastid)
 129                                 points<<[xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0]
 130                         end
 131                         lastid=row['id2'].to_i
 132                         points<<[xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 133                         xmin=[xmin,row['long1'].to_f,row['long2'].to_f].min
 134                         xmax=[xmax,row['long1'].to_f,row['long2'].to_f].max
 135                         ymin=[ymin,row['lat1'].to_f,row['lat2'].to_f].min
 136                         ymax=[ymax,row['lat1'].to_f,row['lat2'].to_f].max
 137                 }
 138
 139                 attributes={}
 140                 attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 141                 attrlist.each {|a| attributes[a['k']]=a['v'] }
 142
 143                 [objname,points,attributes,xmin,xmax,ymin,ymax]
 144         end
 145
 146         # ----- putway (user token, way, array of co-ordinates, array of attributes,
 147         #                               baselong, basey, masterscale)
 148         #               returns current way ID, new way ID, hash of renumbered nodes,
 149         #                               xmin,xmax,ymin,ymax
 150
 151         def putway(args)
 152                 usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 153                 uid=getuserid(usertoken); if !uid then return end
 154                 db_uqs='uniq'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s     # temp uniquesegments table name, typically 51 chars
 155                 db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 156                 ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 157                 originalway=originalway.to_i
 158
 159                 # -- 3. read original way into memory
 160
 161                 xc={}; yc={}; tagc={}; seg={}
 162                 if (originalway>0)
 163                         way=originalway
 164                         readwayquery(way).each { |row|
 165                                 id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 166                                 id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 167                                 seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 168                         }
 169                 else
 170                         way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 171                 end
 172
 173                 # -- 4. get version by inserting new row into ways
 174
 175                 version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 176
 177                 # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 178
 179                 xmin=999999; xmax=-999999
 180                 ymin=999999; ymax=-999999
 181                 insertsql=''
 182                 nodelist=''
 183                 renumberednodes={}
 184
 185                 points.each_index do |i|
 186                         xs=coord2long(points[i][0],masterscale,baselong)
 187                         ys=coord2lat(points[i][1],masterscale,basey)
 188                         xmin=[xs,xmin].min; xmax=[xs,xmax].max
 189                         ymin=[ys,ymin].min; ymax=[ys,ymax].max
 190                         node=points[i][2].to_i
 191                         tagstr=array2tag(points[i][4])
 192                         tagsql="'"+sqlescape(tagstr)+"'"
 193
 194                         # compare node
 195                         if node<0
 196                                 # new node - create
 197                                 newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags) VALUES (           #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 198                                                 ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 199                                 points[i][2]=newnode
 200                                 renumberednodes[node.to_s]=newnode.to_s
 201
 202                         elsif xc.has_key?(node)
 203                                 # old node from original way - update
 204                                 if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
 205                                         ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 206                                         ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{ys},longitude=#{xs},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1 WHERE id=#{node}")
 207                                 else
 208                                         if (nodelist!='') then nodelist+=',' end; nodelist+=node.to_s
 209                                 end
 210                         else
 211                                 # old node, created in another way and now added to this way
 212                                 if (nodelist!='') then nodelist+=',' end; nodelist+=node.to_s
 213                         end
 214
 215                 end
 216
 217                 if nodelist!='' then
 218                         ActiveRecord::Base.connection.update("UPDATE current_nodes SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id IN (#{nodelist})")
 219                 end
 220
 221                 # -- 6.i compare segments
 222
 223                 numberedsegments={}
 224                 seglist=''
 225                 for i in (0..(points.length-2))
 226                         if (points[i+1][3].to_i==0) then next end
 227                         segid=points[i+1][5].to_i
 228                         from =points[i  ][2].to_i
 229                         to   =points[i+1][2].to_i
 230                         if seg.has_key?(segid)
 231                                 if seg[segid]=="#{from}-#{to}" then
 232                                         if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 233                                         next
 234                                 end
 235                         end
 236                         segid=ActiveRecord::Base.connection.insert("INSERT INTO current_segments (   node_a,node_b,timestamp,user_id,visible,tags) VALUES (         #{from},#{to},#{db_now},#{uid},1,'')")
 237                                   ActiveRecord::Base.connection.insert("INSERT INTO segments         (id,node_a,node_b,timestamp,user_id,visible,tags) VALUES (#{segid},#{from},#{to},#{db_now},#{uid},1,'')")
 238                         points[i+1][5]=segid
 239                         numberedsegments[(i+1).to_s]=segid.to_s
 240                 end
 241                 # numberedsegments.each{|a,b| RAILS_DEFAULT_LOGGER.error("Sending back: seg no. #{a} -> id #{b}") }
 242
 243                 if seglist!='' then
 244                         ActiveRecord::Base.connection.update("UPDATE current_segments SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id IN (#{seglist})")
 245                 end
 246
 247
 248                 # -- 6.ii insert new way segments
 249
 250                 createuniquesegments(way,db_uqs)
 251
 252                 # a=''
 253                 # ActiveRecord::Base.connection.select_values("SELECT segment_id FROM #{db_uqs}").each {|b| a+=b+',' }
 254                 # RAILS_DEFAULT_LOGGER.error("Unique segments are #{a}")
 255                 # a=ActiveRecord::Base.connection.select_value("SELECT #{db_now}")
 256                 # RAILS_DEFAULT_LOGGER.error("Timestamp of this edit is #{a}")
 257                 # RAILS_DEFAULT_LOGGER.error("Userid of this edit is #{uid}")
 258
 259                 #               delete nodes from uniquesegments (and not in modified way)
 260
 261                 sql=<<-EOF
 262                         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 263                         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 264                           FROM current_nodes AS cn,
 265                                    current_segments AS cs,
 266                                    #{db_uqs} AS us
 267                          WHERE(cn.id=cs.node_a OR cn.id=cs.node_b)
 268                            AND cs.id=us.segment_id AND cs.visible=1
 269                            AND (cn.timestamp!=#{db_now} OR cn.user_id!=#{uid})
 270                 EOF
 271                 ActiveRecord::Base.connection.insert(sql)
 272
 273                 sql=<<-EOF
 274                         UPDATE current_nodes AS cn,
 275                                    current_segments AS cs,
 276                                    #{db_uqs} AS us
 277                            SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 278                          WHERE (cn.id=cs.node_a OR cn.id=cs.node_b)
 279                            AND cs.id=us.segment_id AND cs.visible=1
 280                            AND (cn.timestamp!=#{db_now} OR cn.user_id!=#{uid})
 281                 EOF
 282                 ActiveRecord::Base.connection.update(sql)
 283
 284                 #               delete segments from uniquesegments (and not in modified way)
 285
 286                 sql=<<-EOF
 287                         INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 288                         SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 289                           FROM current_segments AS cs, #{db_uqs} AS us
 290                          WHERE cs.id=us.segment_id AND cs.visible=1
 291                            AND (cs.timestamp!=#{db_now} OR cs.user_id!=#{uid})
 292                 EOF
 293                 ActiveRecord::Base.connection.insert(sql)
 294
 295                 sql=<<-EOF
 296                            UPDATE current_segments AS cs, #{db_uqs} AS us
 297                                   SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 298                                 WHERE cs.id=us.segment_id AND cs.visible=1
 299                                   AND (cs.timestamp!=#{db_now} OR cs.user_id!=#{uid})
 300                 EOF
 301                 ActiveRecord::Base.connection.update(sql)
 302                 ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 303
 304                 #               insert new version of route into way_segments
 305
 306                 insertsql =''
 307                 currentsql=''
 308                 sequence  =1
 309                 for i in (0..(points.length-2))
 310                         if (points[i+1][3].to_i==0) then next end
 311                         if insertsql !='' then insertsql +=',' end
 312                         if currentsql!='' then currentsql+=',' end
 313                         insertsql +="(#{way},#{points[i+1][5]},#{version})"
 314                         currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 315                         sequence  +=1
 316                 end
 317
 318                 ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 319                 ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 320                 ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 321
 322                 # -- 7. insert new way tags
 323
 324                 insertsql =''
 325                 currentsql=''
 326                 attributes.each do |k,v|
 327                         if v=='' then next end
 328                         if v[0,6]=='(type ' then next end
 329                         if insertsql !='' then insertsql +=',' end
 330                         if currentsql!='' then currentsql+=',' end
 331                         insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',version)"
 332                         currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 333                 end
 334
 335                 ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 336                 if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 337                 if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 338
 339                 [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 340         end
 341
 342         # ----- deleteway (user token, way)
 343         #               returns way ID only
 344
 345         def deleteway(args)
 346                 usertoken,way=args
 347                 uid=getuserid(usertoken); if !uid then return end
 348                 way=way.to_i
 349
 350                 db_uqs='uniq'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # temp uniquesegments table name, typically 51 chars
 351                 db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 352                 ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 353                 createuniquesegments(way,db_uqs)
 354
 355                 sql=<<-EOF
 356                         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 357                         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 358                           FROM current_nodes AS cn,
 359                                    current_segments AS cs,
 360                                    #{db_uqs} AS us
 361                          WHERE (cn.id=cs.node_a OR cn.id=cs.node_b)
 362                            AND cs.id=us.segment_id
 363                 EOF
 364                 ActiveRecord::Base.connection.insert(sql)
 365
 366                 sql=<<-EOF
 367                         UPDATE current_nodes AS cn,
 368                                    current_segments AS cs,
 369                                    #{db_uqs} AS us
 370                            SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 371                          WHERE (cn.id=cs.node_a OR cn.id=cs.node_b)
 372                            AND cs.id=us.segment_id
 373                 EOF
 374                 ActiveRecord::Base.connection.update(sql)
 375
 376                 # -     delete any otherwise unused segments
 377
 378                 sql=<<-EOF
 379                         INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 380                         SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 381                           FROM current_segments AS cs, #{db_uqs} AS us
 382                          WHERE cs.id=us.segment_id
 383                 EOF
 384                 ActiveRecord::Base.connection.insert(sql)
 385
 386                 sql=<<-EOF
 387                         UPDATE current_segments AS cs, #{db_uqs} AS us
 388                            SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 389                          WHERE cs.id=us.segment_id
 390                 EOF
 391                 ActiveRecord::Base.connection.update(sql)
 392                 ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 393
 394                 # - delete way
 395
 396                 ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 397                 ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 398                 ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 399                 ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 400
 401                 way
 402         end
 403
 404         # ====================================================================
 405         # Support functions for remote calls
 406
 407         def readwayquery(id)
 408                 ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+
 409                         "                 n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 410                         "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 411                         "   WHERE current_way_segments.id=#{id} "+
 412                         "     AND segment_id=current_segments.id "+
 413                         "     AND n1.id=node_a and n2.id=node_b "+
 414                         "   ORDER BY sequence_id"
 415         end
 416
 417         def createuniquesegments(way,uqs_name)
 418                 sql=<<-EOF
 419                         CREATE TEMPORARY TABLE #{uqs_name}
 420                                                         SELECT a.segment_id,COUNT(a.segment_id) AS ct
 421                                                           FROM current_way_segments AS a, current_way_segments AS b
 422                                                          WHERE a.segment_id=b.segment_id
 423                                                            AND a.id=#{way}
 424                                                   GROUP BY a.segment_id
 425                                                         HAVING ct=1
 426                 EOF
 427                 ActiveRecord::Base.connection.execute(sql)
 428         end
 429
 430
 431         def sqlescape(a)
 432                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 433         end
 434
 435         def tag2array(a)
 436                 tags={}
 437                 a.gsub(';;;','#%').split(';').each do |b|
 438                         b.gsub!('#%',';;;')
 439                         b.gsub!('===','#%')
 440                         k,v=b.split('=')
 441                         tags[k.gsub('#%','=')]=v.gsub('#%','=')
 442                 end
 443                 tags
 444         end
 445
 446         def array2tag(a)
 447                 str=''
 448                 a.each do |k,v|
 449                         if v=='' then next end
 450                         if v[0,6]=='(type ' then next end
 451                         if str!='' then str+=';' end
 452                         str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 453                 end
 454                 str
 455         end
 456
 457         def getuserid(token)
 458                 token=sqlescape(token)
 459                 if (token=~/^(.+)\+(.+)$/) then
 460                         return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND timeout>NOW() AND email='#{$1}' AND pass_crypt=MD5('#{$2}')")
 461                 else
 462                         return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND timeout>NOW() AND token='#{token}'")
 463                 end
 464         end
 465
 466
 467
 468         # ====================================================================
 469         # AMF read subroutines
 470
 471         # ----- getint          return two-byte integer
 472         # ----- getlong         return four-byte long
 473         # ----- getstring       return string with two-byte length
 474         # ----- getdouble       return eight-byte double-precision float
 475         # ----- getobject       return object/hash
 476         # ----- getarray        return numeric array
 477
 478         def getint(s)
 479                 s.getc*256+s.getc
 480         end
 481
 482         def getlong(s)
 483                 ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 484         end
 485
 486         def getstring(s)
 487                 len=s.getc*256+s.getc
 488                 s.read(len)
 489         end
 490
 491         def getdouble(s)
 492                 a=s.read(8).unpack('G')                 # G big-endian, E little-endian
 493                 a[0]
 494         end
 495
 496         def getarray(s)
 497                 len=getlong(s)
 498                 arr=[]
 499                 for i in (0..len-1)
 500                         arr[i]=getvalue(s)
 501                 end
 502                 arr
 503         end
 504
 505         def getobject(s)
 506                 arr={}
 507                 while (key=getstring(s))
 508                         if (key=='') then break end
 509                         arr[key]=getvalue(s)
 510                 end
 511                 s.getc          # skip the 9 'end of object' value
 512                 arr
 513         end
 514
 515         # ----- getvalue        parse and get value
 516
 517         def getvalue(s)
 518                 case s.getc
 519                         when 0; return getdouble(s)                     # number
 520                         when 1; return s.getc                           # boolean
 521                         when 2; return getstring(s)                     # string
 522                         when 3; return getobject(s)                     # object/hash
 523                         when 5; return nil                                      # null
 524                         when 6; return nil                                      # undefined
 525                         when 8; s.read(4)                                       # mixedArray
 526                                         return getobject(s)                     #  |
 527                         when 10;return getarray(s)                      # array
 528                         else;   return nil                                      # error
 529                 end
 530         end
 531
 532         # ====================================================================
 533         # AMF write subroutines
 534
 535         # ----- putdata         envelope data into AMF writeable form
 536         # ----- encodevalue     pack variables as AMF
 537
 538         def putdata(index,n)
 539                 d =encodestring(index+"/onResult")
 540                 d+=encodestring("null")
 541                 d+=[-1].pack("N")
 542                 d+=encodevalue(n)
 543         end
 544
 545         def encodevalue(n)
 546                 case n.class.to_s
 547                         when 'Array'
 548                                 a=10.chr+encodelong(n.length)
 549                                 n.each do |b|
 550                                         a+=encodevalue(b)
 551                                 end
 552                                 a
 553                         when 'Hash'
 554                                 a=3.chr
 555                                 n.each do |k,v|
 556                                         a+=encodestring(k)+encodevalue(v)
 557                                 end
 558                                 a+0.chr+0.chr+9.chr
 559                         when 'String'
 560                                 2.chr+encodestring(n)
 561                         when 'Bignum','Fixnum','Float'
 562                                 0.chr+encodedouble(n)
 563                         when 'NilClass'
 564                                 5.chr
 565                         else
 566                                 RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 567                 end
 568         end
 569
 570         # ----- encodestring    encode string with two-byte length
 571         # ----- encodedouble    encode number as eight-byte double precision float
 572         # ----- encodelong              encode number as four-byte long
 573
 574         def encodestring(n)
 575                 a,b=n.size.divmod(256)
 576                 a.chr+b.chr+n
 577         end
 578
 579         def encodedouble(n)
 580                 [n].pack('G')
 581         end
 582
 583         def encodelong(n)
 584                 [n].pack('N')
 585         end
 586
 587         # ====================================================================
 588         # Co-ordinate conversion
 589
 590         def lat2coord(a,basey,masterscale)
 591                 -(lat2y(a)-basey)*masterscale+250
 592         end
 593
 594         def long2coord(a,baselong,masterscale)
 595                 (a-baselong)*masterscale+350
 596         end
 597
 598         def lat2y(a)
 599                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 600         end
 601
 602         def coord2lat(a,masterscale,basey)
 603                 y2lat((a-250)/-masterscale+basey)
 604         end
 605
 606         def coord2long(a,masterscale,baselong)
 607                 (a-350)/masterscale+baselong
 608         end
 609
 610         def y2lat(a)
 611                 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 612         end
 613
 614 =end
 615 end