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Aminet 21 (1997)(GTI - Schatztruhe)[!][Oct 1997].iso
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1997-08-14
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% Copyright (C) 1994, 1996, 1997 Aladdin Enterprises. All rights reserved.
%
% This file is part of Aladdin Ghostscript.
%
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing. Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
%
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC. The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License. Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.
% Initialization file for Level 2 resource machinery.
% When this is run, systemdict is still writable,
% but (almost) everything defined here goes into level2dict.
level2dict begin
(BEGIN RESOURCES) VMDEBUG
% We keep track of (global) instances with another entry in the resource
% dictionary, an Instances dictionary. For categories with implicit
% instances, the values in Instances are the same as the keys;
% for other categories, the values are [instance status size].
% Note that the dictionary that defines a resource category is stored
% in global memory. The PostScript manual says that each category must
% manage global and local instances separately. However, objects in
% global memory other than systemdict can't reference objects in local memory.
% This means that the resource category dictionary, which would otherwise be
% the obvious place to keep track of the instances, can't be used to keep
% track of local instances. Instead, we define a dictionary in local VM
% called localinstancedict, in which the key is the category name and
% the value is the analogue of Instances for local instances.
% We don't currently implement automatic resource unloading.
% When and if we do, it should be hooked to the garbage collector.
% However, Ed Taft of Adobe says their interpreters don't implement this
% either, so we aren't going to worry about it for a while.
currentglobal false setglobal systemdict begin
/localinstancedict 5 dict def
end true setglobal
/.emptydict 0 dict readonly def
setglobal
% Resource category dictionaries have the following keys (those marked with
% * are optional):
% Standard, defined in the Red Book:
% Category (name)
% *InstanceType (name)
% DefineResource
% <key> <instance> DefineResource <instance>
% UndefineResource
% <key> UndefineResource -
% FindResource
% <key> FindResource <instance>
% ResourceStatus
% <key> ResourceStatus <status> <size> true
% <key> ResourceStatus false
% ResourceForAll
% <template> <proc> <scratch> ResourceForAll -
% *ResourceFileName
% <key> <scratch> ResourceFileName <filename>
% Additional, specific to our implementation:
% Instances (dictionary)
% .LocalInstances
% - .LocalInstances <dict>
% .GetInstance
% <key> .GetInstance <instance> -true-
% <key> .GetInstance -false-
% .CheckResource
% <key> <value> .CheckResource <key> <value> <ok>
% (or may give an error if not OK)
% .DoLoadResource
% <key> .DoLoadResource - (may give an error)
% .LoadResource
% <key> .LoadResource - (may give an error)
% .ResourceFile
% <key> .ResourceFile <file> -true-
% <key> .ResourceFile <key> -false-
% All the above procedures expect that the top dictionary on the d-stack
% is the resource dictionary.
% Define enough of the Category category so we can define other categories.
% The dictionary we're about to create will become the Category
% category definition dictionary.
/.findcategory % <name> .findcategory <category>
{ { /Category findresource } stopped { pop stop } if
} bind def
/.resourceexec % <key> /xxxResource .resourceexec -
{ % (also pops the category from the dstack)
load stopped { Category end stop } if end
} bind def
12 dict begin
% Standard entries
/Category /Category def
/InstanceType /dicttype def
/DefineResource
{ .CheckResource
{ dup /Category 3 index cvlit .growput
% We would like to make Category dictionaries read-only,
% and we used to do that here, but we can't do it,
% because we have to be able to replace the dummy, empty
% Instances dictionary with the real one later.
dup [ exch 0 -1 ] exch
Instances 4 2 roll put
}
{ /defineresource load /typecheck signalerror
}
ifelse
} bind def
/FindResource % (redefined below)
{ Instances exch get 0 get
} bind def
% Additional entries
/Instances 25 dict def
Instances /Category [currentdict 0 -1] put
/.LocalInstances 0 dict def
/.GetInstance
{ Instances exch .knownget
} bind def
/.CheckResource
{ dup gcheck currentglobal and
{ /DefineResource /FindResource /ResourceForAll /ResourceStatus
/UndefineResource }
{ 2 index exch known and }
forall
not { /defineresource load /invalidaccess signalerror } if
true
} bind def
Instances end begin % for the base case of findresource
(END CATEGORY) VMDEBUG
% Define the resource operators. We use the "stack protection" feature of
% odef to make sure the stacks are restored properly on an error.
% This requires that the operators not pop anything from the stack until
% they have executed their logic successfully. We can't make this
% work for resourceforall, but we can make it work for the others.
mark
/defineresource { % <key> <instance> <category> defineresource <instance>
3 copy .findcategory dup begin
/InstanceType known {
dup type InstanceType ne {
dup type /packedarraytype eq InstanceType /arraytype eq and
not { /defineresource load /typecheck signalerror } if
} if
} if
/DefineResource .resourceexec
4 1 roll pop pop pop
}
/findresource { % <key> <category> findresource <instance>
2 copy dup /Category eq
{ pop //Category 0 get } { .findcategory } ifelse
begin
/FindResource .resourceexec exch pop exch pop
}
/resourceforall { % <template> <proc> <scratch> <category> resourceforall -
.findcategory begin /ResourceForAll .resourceexec
}
/resourcestatus { % <key> <category> resourcestatus <status> <size> true
% <key> <category> resourcestatus false
2 copy .findcategory begin /ResourceStatus .resourceexec
{ 4 2 roll pop pop true } { pop pop false } ifelse
}
/undefineresource { % <key> <category> undefineresource -
2 copy .findcategory begin /UndefineResource .resourceexec pop pop
}
end % Instances of Category
counttomark 2 idiv { bind odef } repeat pop
% Define the system parameters used for the Generic implementation of
% ResourceFileName.
systemdict begin
currentdict /systemparams known not { /systemparams 10 dict readonly def } if
systemparams
dup /FontResourceDir (/Resource/Font/) readonly .forceput
dup /GenericResourceDir (/Resource/) readonly .forceput
dup /GenericResourcePathSep (/) readonly .forceput
pop
end
% Define the generic algorithm for computing resource file names.
/.rfnstring 100 string def
/.genericrfn % <key> <scratch> <prefix> .genericrfn <filename>
{ 3 -1 roll //.rfnstring cvs concatstrings exch copy
} bind def
% Define the Generic category.
/Generic mark
% Standard entries
% We're still running in Level 1 mode, so dictionaries won't expand.
% Leave room for the /Category entry.
/Category null
/DefineResource
{ .CheckResource
{ dup [ exch 0 -1 ]
% Stack: key value instance
currentglobal
{ false setglobal 2 index UndefineResource % remove local def if any
true setglobal
Instances dup //.emptydict eq
{ pop 3 dict /Instances 1 index def
}
if
}
{ .LocalInstances dup //.emptydict eq
{ pop 3 dict localinstancedict Category 2 index put
}
if
}
ifelse
% Stack: key value instance instancedict
3 index 2 index .growput
% Now make the resource value read-only.
0 2 copy get { readonly } .internalstopped pop
dup 4 1 roll put exch pop exch pop
}
{ /defineresource load /typecheck signalerror
}
ifelse
} bind
/UndefineResource
{ { dup 2 index .knownget
{ dup 1 get 1 ge
{ dup 0 null put 1 2 put pop pop }
{ pop exch .undef }
ifelse
}
{ pop pop
}
ifelse
}
currentglobal
{ 2 copy Instances exch exec
}
if .LocalInstances exch exec
} bind
/FindResource
{ dup ResourceStatus
{ pop 1 gt % not in VM
{ .DoLoadResource
}
if
.GetInstance pop % can't fail
0 get
}
{ /findresource load /undefinedresource signalerror
}
ifelse
} bind
/ResourceStatus
{ dup .GetInstance
{ exch pop dup 1 get exch 2 get true }
{ .ResourceFile
{ closefile 2 -1 true }
{ pop false }
ifelse
}
ifelse
} bind
/ResourceForAll
{ % **************** Doesn't present instance groups in
% **************** the correct order yet.
% We construct a new procedure so we don't have to use
% static resources to hold the iteration state.
% Make sure it is in local VM, to avoid an invalidaccess.
3 copy .currentglobal 4 1 roll false .setglobal
3 packedarray % template, proc, scratch
{ exch pop % stack contains: key, {template, proc, scratch}
2 copy 0 get .stringmatch
{ 1 index type dup /stringtype eq exch /nametype eq or
{ 2 copy 2 get cvs
exch 1 get 3 -1 roll pop
}
{ 1 get
}
ifelse exec
}
{ pop pop
}
ifelse
} /exec cvx 3 packedarray cvx
% Stack: template proc scratch global? iterproc
% We must pop the resource dictionary off the dict stack
% when doing the actual iteration, and restore it afterwards.
currentglobal .LocalInstances length 0 eq or not
{ % We must do local instances, and do them first.
/forall cvx 1 index currentdict 3 packedarray cvx
.LocalInstances 3 1 roll end exec begin
}
if
exch .setglobal
Instances exch
/forall cvx currentdict
end 2 .execn begin pop pop pop
} bind
/ResourceFileName
{ /GenericResourceDir getsystemparam
Category .namestring concatstrings
/GenericResourcePathSep getsystemparam concatstrings
.genericrfn
} bind
% Additional entries
% Unfortunately, we can't create the real Instances dictionary now,
% because if someone copies the Generic category (which pp. 95-96 of the
% 2nd Edition Red Book says is legitimate), they'll wind up sharing
% the Instances. Instead, we have to create Instances on demand,
% just like the entry in localinstancedict.
% We also have to prevent anyone from creating instances of Generic itself.
/Instances //.emptydict
/.LocalInstances
{ localinstancedict Category .knownget not { //.emptydict } if
} bind
/.GetInstance
{ currentglobal
{ Instances exch .knownget }
{ .LocalInstances 1 index .knownget
{ exch pop true }
{ Instances exch .knownget }
ifelse
}
ifelse
} bind
/.CheckResource
{ true
} bind
/.DoLoadResource
{ dup vmstatus pop exch pop exch
.LoadResource
vmstatus pop exch pop exch sub
1 index .GetInstance not
{ pop dup /undefinedresource signalerror } % didn't load
if
dup 1 1 put
2 3 -1 roll put
} bind
/.LoadResource
{ dup .ResourceFile
{ exch pop currentglobal
{ run }
{ true setglobal { run } stopped false setglobal { stop } if }
ifelse
}
{ dup /undefinedresource signalerror
}
ifelse
} bind
/.ResourceFile
{ currentdict /ResourceFileName known
{ mark 1 index 100 string { ResourceFileName }
.internalstopped
{ cleartomark false }
{ exch pop findlibfile
{ exch pop exch pop true }
{ pop false }
ifelse
}
ifelse
}
{ false }
ifelse
} bind
.dicttomark
/Category defineresource pop
% Fill in the rest of the Category category.
/Category /Category findresource dup
/Generic /Category findresource begin
{ /FindResource /ResourceForAll /ResourceStatus /UndefineResource /.ResourceFile }
{ dup load put dup } forall
pop readonly pop end
(END GENERIC) VMDEBUG
% Define the fixed categories.
mark
% Things other than types
/ColorSpaceFamily
mark colorspacedict { pop } forall .packtomark
/Emulator
mark EMULATORS { cvn } forall .packtomark
/Filter
mark filterdict { pop } forall .packtomark
/IODevice
% Loop until the .getiodevice gets a rangecheck.
errordict /rangecheck 2 copy get
errordict /rangecheck { pop stop } put % pop the command
mark 0 { {dup .getiodevice exch 1 add} loop} .internalstopped
pop pop pop .packtomark
4 1 roll put
.clearerror
% Types
/setcolorrendering where
{ pop /ColorRenderingType
{1}
} if
/FMapType
{ } % These must be deferred, because optional features may add some.
/FontType
{ } % These must be deferred, because optional features may add some.
/FormType
{1}
/HalftoneType
{1 2 3 4 5}
/ImageType
{1}
/PatternType
{1} % should check for Pattern color space
counttomark 2 idiv
{ mark
% Standard entries
% We'd like to prohibit defineresource,
% but because optional features may add entries, we can't.
% We can at least require that the key and value match.
/DefineResource
{ currentglobal not
{ /defineresource load /invalidaccess signalerror }
{ 2 copy ne
{ /defineresource load /rangecheck signalerror }
{ dup Instances 4 -2 roll .growput }
ifelse
}
ifelse
} bind
/UndefineResource
{ /undefineresource load /invalidaccess signalerror } bind
/FindResource
{ Instances 1 index .knownget
{ exch pop }
{ /findresource load /undefinedresource signalerror }
ifelse
} bind
/ResourceStatus
{ Instances exch known { 0 0 true } { false } ifelse } bind
/ResourceForAll
/Generic /Category findresource /ResourceForAll get
% Additional entries
counttomark 2 add -1 roll
dup length dict dup begin exch { dup def } forall end
% We'd like to make the Instances readonly here,
% but because optional features may add entries, we can't.
/Instances exch
/.LocalInstances % used by ResourceForAll
0 dict def
.dicttomark /Category defineresource pop
} repeat pop
(END FIXED) VMDEBUG
% Define the other built-in categories.
/.definecategory % <name> -mark- <key1> ... <valuen> .definecategory -
{ counttomark 2 idiv 2 add % Instances, Category
/Generic /Category findresource dup maxlength 3 -1 roll add
dict .copydict begin
counttomark 2 idiv { def } repeat pop % pop the mark
currentdict end /Category defineresource pop
} bind def
/ColorRendering mark /InstanceType /dicttype .definecategory
/ColorSpace mark /InstanceType /arraytype .definecategory
/Form mark /InstanceType /dicttype .definecategory
/Halftone mark /InstanceType /dicttype .definecategory
/Pattern mark /InstanceType /dicttype .definecategory
/ProcSet mark /InstanceType /dicttype .definecategory
(END MISC) VMDEBUG
% Define the Encoding category.
/Encoding mark
/InstanceType /arraytype
% Handle already-registered encodings, including lazily loaded encodings
% that aren't loaded yet.
/Instances mark
EncodingDirectory
{ dup length 256 eq { [ exch readonly 0 -1 ] } { pop [null 2 -1] } ifelse
} forall
.dicttomark
/.ResourceFileDict mark
EncodingDirectory
{ dup length 256 eq { pop pop } { 0 get } ifelse
} forall
.dicttomark
/ResourceFileName
{ .ResourceFileDict 2 index .knownget
{ exch copy exch pop }
{ /Generic /Category findresource /ResourceFileName get exec }
ifelse
} bind
.definecategory % Encoding
% Make placeholders in level2dict for the redefined Encoding operators,
% so that they will be swapped properly when we switch language levels.
/.findencoding /.findencoding load def
/findencoding /findencoding load def
/.defineencoding /.defineencoding load def
(END ENCODING) VMDEBUG
% Define the Font category.
/Font mark
/InstanceType /dicttype
/DefineResource
{ 2 copy //definefont exch pop
/Generic /Category findresource /DefineResource get exec
} bind
/UndefineResource
{ dup //undefinefont
/Generic /Category findresource /UndefineResource get exec
} bind
/FindResource
{ dup ResourceStatus
{ pop 1 gt { .loadfont } { .GetInstance pop 0 get } ifelse }
{ .loadfont }
ifelse
} bind
/ResourceFileName
{ /FontResourceDir getsystemparam .genericrfn
} bind
/.loadfont
{ dup vmstatus pop exch pop exch
//findfont exec exch % findfont is a procedure....
vmstatus pop exch pop exch sub
% stack: name font vmused
% findfont has the prerogative of not calling definefont
% in certain obscure cases of font substitution.
2 index .GetInstance
{ dup 1 1 put
2 3 -1 roll put
}
{ pop
}
ifelse exch pop
} bind
/Instances FontDirectory length 2 mul dict
.definecategory % Font
% Redefine font "operators".
/.definefontmap
{ /Font /Category findresource /Instances get
dup 3 index known
{ pop
}
{ 2 index
% Make sure we create the array in global VM.
.currentglobal true .setglobal
[null 2 -1] exch .setglobal
.growput
}
ifelse
//.definefontmap exec
} bind def
% Make sure the old definitions are still in systemdict so that
% they will get bound properly.
systemdict begin
/.origdefinefont /definefont load def
/.origundefinefont /undefinefont load def
/.origfindfont /findfont load def
end
/definefont {
/Font defineresource
} bind odef
/undefinefont {
/Font undefineresource
} bind odef
% The Red Book requires that findfont be a procedure, not an operator,
% but it still needs to restore the stacks reliably if it fails.
/.findfontop {
/Font findresource
} bind odef
/findfont {
.findfontop
} bind def % Must be a procedure, not an operator
% Remove initialization utilities.
currentdict /.definecategory .undef
currentdict /.emptydict .undef
end % level2dict
% Convert deferred resources after we finally switch to Level 2.
/.fixresources {
% Encoding resources
EncodingDirectory
{ dup length 256 eq
{ /Encoding defineresource pop }
{ pop pop }
ifelse
} forall
/.findencoding { /Encoding findresource } bind def
/findencoding /.findencoding load odef
/.defineencoding { /Encoding defineresource pop } bind def
% ColorRendering resources and ProcSet
systemdict /ColorRendering .knownget {
/ColorRendering exch /ProcSet defineresource pop
systemdict /ColorRendering undef
/DefaultColorRendering currentcolorrendering /ColorRendering
defineresource pop
% FontType and FMapType resources
buildfontdict { pop dup /FontType defineresource pop } forall
mark
buildfontdict 0 known { 2 3 4 5 6 7 8 } if
buildfontdict 9 known { 9 } if
counttomark { dup /FMapType defineresource pop } repeat pop
} if
% Make the fixed resource categories immutable.
{ /ColorSpaceFamily /Emulator /Filter /IODevice /ColorRenderingType
/FMapType /FontType /FormType /HalftoneType /ImageType /PatternType
} {
/Category findresource
dup /Instances get readonly pop
.LocalInstances readonly pop
readonly pop
} forall
% clean up
systemdict /.fixresources undef
} bind def