X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/e5a5f957ef46d76ec78e2c0450b50a086dff82b6..9d6ae5baae9f86acb8e2d9fcb006d8b81167281b:/app/controllers/amf_controller.rb?ds=inline diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb index 38c567734..72f1dd74e 100644 --- a/app/controllers/amf_controller.rb +++ b/app/controllers/amf_controller.rb @@ -1,319 +1,723 @@ class AmfController < ApplicationController require 'stringio' - # Still to do: - # - all db interaction - # - user authentication - # - (also pass lat/lon through from view tab to edit tab) - -# to log: -# RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}") - + # to log: + # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}") # ==================================================================== # Main AMF handler - + # ---- talk process AMF request def talk - req=StringIO.new(request.raw_post) # Get POST data as request - req.read(2) # Skip version indicator and client ID - results={} # Results of each body - - # ------------- - # Parse request - - headers=getint(req) # Read number of headers - for i in (1..headers) # Read each header - name=getstring(req) # | - req.getc # | skip boolean - value=getvalue(req) # | - header["name"]=value # | - end - - bodies=getint(req) # Read number of bodies - for i in (1..bodies) # Read each body - message=getstring(req) # | get message name - index=getstring(req) # | get index in response sequence - bytes=getlong(req) # | get total size in bytes - args=getvalue(req) # | get response (probably an array) - - case message - when 'getpresets'; results[index]=putdata(index,getpresets) - when 'whichways'; results[index]=putdata(index,whichways(args)) - when 'getway'; results[index]=putdata(index,getway(args)) - when 'putway'; results[index]=putdata(index,putway(args)) - when 'deleteway'; results[index]=putdata(index,deleteway(args)) + req=StringIO.new(request.raw_post) # Get POST data as request + req.read(2) # Skip version indicator and client ID + results={} # Results of each body + + # ------------- + # Parse request + + headers=getint(req) # Read number of headers + + headers.times do # Read each header + name=getstring(req) # | + req.getc # | skip boolean + value=getvalue(req) # | + header["name"]=value # | + end + + bodies=getint(req) # Read number of bodies + bodies.times do # Read each body + message=getstring(req) # | get message name + index=getstring(req) # | get index in response sequence + bytes=getlong(req) # | get total size in bytes + args=getvalue(req) # | get response (probably an array) + + RAILS_DEFAULT_LOGGER.info(" Message: #{message}") + + case message + when 'getpresets'; results[index]=putdata(index,getpresets) + when 'whichways'; results[index]=putdata(index,whichways(args)) + when 'getway'; results[index]=putdata(index,getway(args)) + when 'putway'; results[index]=putdata(index,putway(args)) + when 'deleteway'; results[index]=putdata(index,deleteway(args)) + end + end + + # ------------------ + # Write out response + + RAILS_DEFAULT_LOGGER.info(" Response: start") + response.headers["Content-Type"]="application/x-amf" + a,b=results.length.divmod(256) + render :text => proc { |response, output| + output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr + results.each do |k,v| + RAILS_DEFAULT_LOGGER.info(" Response: encode #{k}") + output.write(v) end - end + } + RAILS_DEFAULT_LOGGER.info(" Response: end") + + end + + private + + # ==================================================================== + # Remote calls + + # ----- getpresets + # return presets,presetmenus and presetnames arrays + + def getpresets + presets={} + presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[] + presetnames={}; presetnames['point']={}; presetnames['way']={} + presettype='' + presetcategory='' + + RAILS_DEFAULT_LOGGER.info(" Message: getpresets") + + # File.open("config/potlatch/presets.txt") do |file| + + # Temporary patch to get around filepath problem + # To remove this patch and make the code nice again: + # 1. uncomment above line + # 2. fix the path in the above line + # 3. delete this here document, and the following line (StringIO....) + + txt=<<-EOF +way/road +motorway: highway=motorway,ref=(type road number) +trunk road: highway=trunk,ref=(type road number),name=(type road name) +primary road: highway=primary,ref=(type road number),name=(type road name) +secondary road: highway=secondary,ref=(type road number),name=(type road name) +residential road: highway=residential,name=(type road name) +unclassified road: highway=unclassified,name=(type road name) - # ------------------ - # Write out response +way/footway +footpath: highway=footway,foot=yes +bridleway: highway=bridleway,foot=yes,horse=yes,bicycle=yes +byway: highway=byway,foot=yes,horse=yes,bicycle=yes,motorcar=yes +permissive path: highway=footway,foot=permissive - response.headers["Content-Type"]="application/x-amf" - a,b=results.length.divmod(256) - ans=0.chr+0.chr+0.chr+0.chr+a.chr+b.chr - results.each do |k,v| - ans+=v - end - render :text=>ans +way/cycleway +cycle lane: highway=cycleway,cycleway=lane,ncn_ref= +cycle track: highway=cycleway,cycleway=track,ncn_ref= +cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number) +cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number) +way/waterway +canal: waterway=canal,name=(type name here) +navigable river: waterway=river,boat=yes,name=(type name here) +navigable drain: waterway=drain,boat=yes,name=(type name here) +derelict canal: waterway=derelict_canal,name=(type name here) +unnavigable river: waterway=river,boat=no,name=(type name here) +unnavigable drain: waterway=drain,boat=no,name=(type name here) + +way/railway +railway: railway=rail +tramway: railway=tram +light railway: railway=light_rail +preserved railway: railway=preserved +disused railway tracks: railway=disused +course of old railway: railway=abandoned + +point/road +mini roundabout: highway=mini_roundabout +traffic lights: highway=traffic_signals + +point/footway +bridge: highway=bridge +gate: highway=gate +stile: highway=stile +cattle grid: highway=cattle_grid + +point/cycleway +gate: highway=gate + +point/waterway +lock gate: waterway=lock_gate +weir: waterway=weir +aqueduct: waterway=aqueduct +winding hole: waterway=turning_point +mooring: waterway=mooring + +point/railway +station: railway=station +viaduct: railway=viaduct +level crossing: railway=crossing +EOF + + StringIO.open(txt) do |file| + file.each_line {|line| + t=line.chomp + if (t=~/(\w+)\/(\w+)/) then + presettype=$1 + presetcategory=$2 + presetmenus[presettype].push(presetcategory) + presetnames[presettype][presetcategory]=["(no preset)"] + elsif (t=~/^(.+):\s?(.+)$/) then + pre=$1; kv=$2 + presetnames[presettype][presetcategory].push(pre) + presets[pre]={} + kv.split(',').each {|a| + if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end + } + end + } + end + return [presets,presetmenus,presetnames] end + # ----- whichways(left,bottom,right,top) + # return array of ways in current bounding box + # at present, instead of using correct (=more complex) SQL to find + # corner-crossing ways, it simply enlarges the bounding box by +/- 0.01 - # ==================================================================== - # Remote calls - - def getpresets - presets={} - presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[] - presetnames={}; presetnames['point']={}; presetnames['way']={} - presettype='' - presetcategory='' - - File.open("config/potlatch/presets.txt") do |file| - file.each_line {|line| - t=line.chomp - if (t=~/(\w+)\/(\w+)/) then - presettype=$1 - presetcategory=$2 - presetmenus[presettype].push(presetcategory) - presetnames[presettype][presetcategory]=["(no preset)"] - elsif (t=~/^(.+):\s?(.+)$/) then - pre=$1; kv=$2 - presetnames[presettype][presetcategory].push(pre) - presets[pre]={} - kv.split(',').each {|a| - if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end - } - end - } - end - [presets,presetmenus,presetnames] - end - - def whichways(args) - waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+ - " FROM current_way_segments,current_segments,current_nodes "+ - " WHERE segment_id=current_segments.id "+ - " AND node_a=current_nodes.id "+ - " AND (latitude BETWEEN "+(args[1].to_f-0.01).to_s+" AND "+(args[3].to_f+0.01).to_s+") "+ - " AND (longitude BETWEEN "+(args[0].to_f-0.01).to_s+" AND "+(args[2].to_f+0.01).to_s+")") - ways=[] - waylist.each {|a| - ways<0 + way=originalway + readwayquery(way).each { |row| + id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1'] + id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2'] + seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s + } + ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}") + else + way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)") + end + + # -- 4. get version by inserting new row into ways + + version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)") + + # -- 5. compare nodes and update xmin,xmax,ymin,ymax + + xmin = ymin = 999999 + xmax = ymax = -999999 + insertsql = '' + renumberednodes={} + + points.each_index do |i| + xs=coord2long(points[i][0],masterscale,baselong) + ys=coord2lat(points[i][1],masterscale,basey) + xmin=[xs,xmin].min; xmax=[xs,xmax].max + ymin=[ys,ymin].min; ymax=[ys,ymax].max + node=points[i][2].to_i + tagstr=array2tag(points[i][4]) + tagsql="'"+sqlescape(tagstr)+"'" + + # compare node + if node<0 + # new node - create + newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes ( latitude,longitude,timestamp,user_id,visible,tags) VALUES ( #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") + ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") + points[i][2]=newnode + renumberednodes[node.to_s]=newnode.to_s + + elsif xc.has_key?(node) + # old node from original way - update + if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node]) + ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") + 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}") + end + else + # old node, created in another way and now added to this way + end + + end + + + # -- 6.i compare segments + + numberedsegments={} + seglist='' # list of existing segments that we want to keep + for i in (0..(points.length-2)) + if (points[i+1][3].to_i==0) then next end + segid=points[i+1][5].to_i + from =points[i ][2].to_i + to =points[i+1][2].to_i + if seg.has_key?(segid) + if seg[segid]=="#{from}-#{to}" then + if (seglist!='') then seglist+=',' end; seglist+=segid.to_s + next + end + end + 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,'')") + 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,'')") + points[i+1][5]=segid + numberedsegments[(i+1).to_s]=segid.to_s + end + # numberedsegments.each{|a,b| RAILS_DEFAULT_LOGGER.error("Sending back: seg no. #{a} -> id #{b}") } + + + # -- 6.ii insert new way segments + + createuniquesegments(way,db_uqs,seglist) # segments which appear in this way but no other + + # delete segments from uniquesegments (and not in modified way) + + sql=<<-EOF + INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible) + SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0 + FROM current_segments AS cs, #{db_uqs} AS us + WHERE cs.id=us.segment_id AND cs.visible=1 + EOF + ActiveRecord::Base.connection.insert(sql) + + sql=<<-EOF + UPDATE current_segments AS cs, #{db_uqs} AS us + SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid} + WHERE cs.id=us.segment_id AND cs.visible=1 + EOF + ActiveRecord::Base.connection.update(sql) + + # delete nodes not in modified way or any other segments + + createuniquenodes(db_uqs,db_uqn) # nodes which appear in this way but no other + + sql=<<-EOF + INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible) + SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0 + FROM current_nodes AS cn,#{db_uqn} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.insert(sql) + + sql=<<-EOF + UPDATE current_nodes AS cn, #{db_uqn} + SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.update(sql) + + ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}") + ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}") + + # insert new version of route into way_segments + + insertsql ='' + currentsql='' + sequence =1 + for i in (0..(points.length-2)) + if (points[i+1][3].to_i==0) then next end + if insertsql !='' then insertsql +=',' end + if currentsql!='' then currentsql+=',' end + insertsql +="(#{way},#{points[i+1][5]},#{version})" + currentsql+="(#{way},#{points[i+1][5]},#{sequence})" + sequence +=1 + end + + ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}"); + ActiveRecord::Base.connection.insert("INSERT INTO way_segments (id,segment_id,version ) VALUES #{insertsql}"); + ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}"); + + # -- 7. insert new way tags + + insertsql ='' + currentsql='' + attributes.each do |k,v| + if v=='' then next end + if v[0,6]=='(type ' then next end + if insertsql !='' then insertsql +=',' end + if currentsql!='' then currentsql+=',' end + insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})" + currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')" + end + + ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}") + if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end + if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end + + [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax] + end + + # ----- deleteway (user token, way) + # returns way ID only + + def deleteway(args) + usertoken,way=args + + RAILS_DEFAULT_LOGGER.info(" Message: deleteway, id=#{way}") + + uid=getuserid(usertoken); if !uid then return end + way=way.to_i + + 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 + db_uqn='unin'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquenodes table name, typically 51 chars + db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars + ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()") + createuniquesegments(way,db_uqs,'') + + # - delete any otherwise unused segments + + sql=<<-EOF + INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible) + SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0 + FROM current_segments AS cs, #{db_uqs} AS us + WHERE cs.id=us.segment_id + EOF + ActiveRecord::Base.connection.insert(sql) + + sql=<<-EOF + UPDATE current_segments AS cs, #{db_uqs} AS us + SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid} + WHERE cs.id=us.segment_id + EOF + ActiveRecord::Base.connection.update(sql) + + # - delete any unused nodes + + createuniquenodes(db_uqs,db_uqn) + + sql=<<-EOF + INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible) + SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0 + FROM current_nodes AS cn,#{db_uqn} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.insert(sql) + + sql=<<-EOF + UPDATE current_nodes AS cn, #{db_uqn} + SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.update(sql) - def coord2lat(a) - y2lat((a-250)/-$masterscale+$basey) - end + ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}") + ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}") + + # - delete way - def coord2long(a) - (a-350)/$masterscale+$baselong - end + ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)") + ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}") + ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}") + ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}") - def y2lat(a) - 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2) - end + way +end + +# ==================================================================== +# Support functions for remote calls + +def readwayquery(id) + ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+ + " n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+ + " FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+ + " WHERE current_way_segments.id=#{id} "+ + " AND segment_id=current_segments.id "+ + " AND current_segments.visible=1 "+ + " AND n1.id=node_a and n2.id=node_b "+ + " AND n1.visible=1 AND n2.visible=1 "+ + " ORDER BY sequence_id" +end + +def createuniquesegments(way,uqs_name,seglist) + # Finds segments which appear in (previous version of) this way and no other + sql=<<-EOF + CREATE TEMPORARY TABLE #{uqs_name} + SELECT a.segment_id + FROM (SELECT DISTINCT segment_id FROM current_way_segments + WHERE id = #{way}) a + LEFT JOIN current_way_segments b + ON b.segment_id = a.segment_id + AND b.id != #{way} + WHERE b.segment_id IS NULL + EOF + if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end + ActiveRecord::Base.connection.execute(sql) +end + +def createuniquenodes(uqs_name,uqn_name) + # Finds nodes which appear in uniquesegments but no other segments + sql=<<-EOF + CREATE TEMPORARY TABLE #{uqn_name} + SELECT DISTINCT node_id + FROM (SELECT cn.id AS node_id + FROM current_nodes AS cn, + current_segments AS cs, + #{uqs_name} AS us + WHERE cs.id=us.segment_id + AND (cn.id=cs.node_a OR cn.id=cs.node_b)) AS n + LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1 + LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1 + WHERE cs2.node_a IS NULL + AND cs3.node_b IS NULL + EOF + ActiveRecord::Base.connection.execute(sql) +end + +def sqlescape(a) + a.gsub("'","''").gsub(92.chr,92.chr+92.chr) +end + +def tag2array(a) + tags={} + a.gsub(';;;','#%').split(';').each do |b| + b.gsub!('#%',';;;') + b.gsub!('===','#%') + k,v=b.split('=') + if k.nil? then k='' end + if v.nil? then v='' end + tags[k.gsub('#%','=')]=v.gsub('#%','=') + end + tags +end + +def array2tag(a) + str='' + a.each do |k,v| + if v=='' then next end + if v[0,6]=='(type ' then next end + if str!='' then str+=';' end + str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===') + end + str +end + +def getuserid(token) + token=sqlescape(token) + if (token=~/^(.+)\+(.+)$/) then + return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND email='#{$1}' AND pass_crypt=MD5('#{$2}')") + else + return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND token='#{token}'") + end +end + +# ==================================================================== +# AMF read subroutines + +# ----- getint return two-byte integer +# ----- getlong return four-byte long +# ----- getstring return string with two-byte length +# ----- getdouble return eight-byte double-precision float +# ----- getobject return object/hash +# ----- getarray return numeric array + +def getint(s) + s.getc*256+s.getc +end + +def getlong(s) + ((s.getc*256+s.getc)*256+s.getc)*256+s.getc +end + +def getstring(s) + len=s.getc*256+s.getc + s.read(len) +end + +def getdouble(s) + a=s.read(8).unpack('G') # G big-endian, E little-endian + a[0] +end + +def getarray(s) + len=getlong(s) + arr=[] + for i in (0..len-1) + arr[i]=getvalue(s) + end + arr +end + +def getobject(s) + arr={} + while (key=getstring(s)) + if (key=='') then break end + arr[key]=getvalue(s) + end + s.getc # skip the 9 'end of object' value + arr +end + +# ----- getvalue parse and get value + +def getvalue(s) + case s.getc + when 0; return getdouble(s) # number + when 1; return s.getc # boolean + when 2; return getstring(s) # string + when 3; return getobject(s) # object/hash + when 5; return nil # null + when 6; return nil # undefined + when 8; s.read(4) # mixedArray + return getobject(s) # | + when 10;return getarray(s) # array + else; return nil # error + end +end + +# ==================================================================== +# AMF write subroutines + +# ----- putdata envelope data into AMF writeable form +# ----- encodevalue pack variables as AMF + +def putdata(index,n) + d =encodestring(index+"/onResult") + d+=encodestring("null") + d+=[-1].pack("N") + d+=encodevalue(n) +end + +def encodevalue(n) + case n.class.to_s + when 'Array' + a=10.chr+encodelong(n.length) + n.each do |b| + a+=encodevalue(b) + end + a + when 'Hash' + a=3.chr + n.each do |k,v| + a+=encodestring(k)+encodevalue(v) + end + a+0.chr+0.chr+9.chr + when 'String' + 2.chr+encodestring(n) + when 'Bignum','Fixnum','Float' + 0.chr+encodedouble(n) + when 'NilClass' + 5.chr + else + RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s) + end +end + +# ----- encodestring encode string with two-byte length +# ----- encodedouble encode number as eight-byte double precision float +# ----- encodelong encode number as four-byte long + +def encodestring(n) + a,b=n.size.divmod(256) + a.chr+b.chr+n +end + +def encodedouble(n) + [n].pack('G') +end + +def encodelong(n) + [n].pack('N') +end + +# ==================================================================== +# Co-ordinate conversion + +def lat2coord(a,basey,masterscale) + -(lat2y(a)-basey)*masterscale+250 +end + +def long2coord(a,baselong,masterscale) + (a-baselong)*masterscale+350 +end + +def lat2y(a) + 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2)) +end + +def coord2lat(a,masterscale,basey) + y2lat((a-250)/-masterscale+basey) +end + +def coord2long(a,masterscale,baselong) + (a-350)/masterscale+baselong +end + +def y2lat(a) + 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2) +end + end