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-rw-r--r--tex/context/base/lpdf-epd.lua702
1 files changed, 351 insertions, 351 deletions
diff --git a/tex/context/base/lpdf-epd.lua b/tex/context/base/lpdf-epd.lua
index 4bf98edcc..b9f8cfc7c 100644
--- a/tex/context/base/lpdf-epd.lua
+++ b/tex/context/base/lpdf-epd.lua
@@ -1,351 +1,351 @@
-if not modules then modules = { } end modules ['lpdf-epd'] = {
- version = 1.001,
- comment = "companion to lpdf-epa.mkiv",
- author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files"
-}
-
--- This is an experimental layer around the epdf library. The reason for
--- this layer is that I want to be independent of the library (which
--- implements a selection of what a file provides) and also because I
--- want an interface closer to Lua's table model while the API stays
--- close to the original xpdf library. Of course, after prototyping a
--- solution, we can optimize it using the low level epdf accessors.
-
--- It will be handy when we have a __length and __next that can trigger
--- the resolve till then we will provide .n as #.
-
--- As there can be references to the parent we cannot expand a tree. I
--- played with some expansion variants but it does to pay off.
-
--- Maybe we need a close().
--- We cannot access all destinations in one run.
-
-local setmetatable, rawset, rawget, tostring, tonumber = setmetatable, rawset, rawget, tostring, tonumber
-local lower, match, char, find, sub = string.lower, string.match, string.char, string.find, string.sub
-local concat = table.concat
-local toutf = string.toutf
-
-local report_epdf = logs.reporter("epdf")
-
--- a bit of protection
-
-local limited = false
-
-directives.register("system.inputmode", function(v)
- if not limited then
- local i_limiter = io.i_limiter(v)
- if i_limiter then
- epdf.open = i_limiter.protect(epdf.open)
- limited = true
- end
- end
-end)
-
---
-
-function epdf.type(o)
- local t = lower(match(tostring(o),"[^ :]+"))
- return t or "?"
-end
-
-lpdf = lpdf or { }
-local lpdf = lpdf
-
-lpdf.epdf = { }
-
-local checked_access
-
-local function prepare(document,d,t,n,k)
- for i=1,n do
- local v = d:getVal(i)
- local r = d:getValNF(i)
- if r:getTypeName() == "ref" then
- r = r:getRef().num
- local c = document.cache[r]
- if c then
- --
- else
- c = checked_access[v:getTypeName()](v,document,r)
- if c then
- document.cache[r] = c
- document.xrefs[c] = r
- end
- end
- t[d:getKey(i)] = c
- else
- t[d:getKey(i)] = checked_access[v:getTypeName()](v,document)
- end
- end
- getmetatable(t).__index = nil
- return t[k]
-end
-
-local function some_dictionary(d,document,r)
- local n = d and d:getLength() or 0
- if n > 0 then
- local t = { }
- setmetatable(t, { __index = function(t,k) return prepare(document,d,t,n,k) end } )
- return t
- end
-end
-
-local done = { }
-
-local function prepare(document,a,t,n,k)
- for i=1,n do
- local v = a:get(i)
- local r = a:getNF(i)
- if v:getTypeName() == "null" then
- -- TH: weird, but appears possible
- elseif r:getTypeName() == "ref" then
- r = r:getRef().num
- local c = document.cache[r]
- if c then
- --
- else
- c = checked_access[v:getTypeName()](v,document,r)
- document.cache[r] = c
- document.xrefs[c] = r
- end
- t[i] = c
- else
- t[i] = checked_access[v:getTypeName()](v,document)
- end
- end
- getmetatable(t).__index = nil
- return t[k]
-end
-
-local function some_array(a,document,r)
- local n = a and a:getLength() or 0
- if n > 0 then
- local t = { n = n }
- setmetatable(t, { __index = function(t,k) return prepare(document,a,t,n,k) end } )
- return t
- end
-end
-
-local function streamaccess(s,_,what)
- if not what or what == "all" or what == "*all" then
- local t, n = { }, 0
- s:streamReset()
- while true do
- local c = s:streamGetChar()
- if c < 0 then
- break
- else
- n = n + 1
- t[n] = char(c)
- end
- end
- return concat(t)
- end
-end
-
-local function some_stream(d,document,r)
- if d then
- d:streamReset()
- local s = some_dictionary(d:streamGetDict(),document,r)
- getmetatable(s).__call = function(...) return streamaccess(d,...) end
- return s
- end
-end
-
--- we need epdf.getBool
-
-checked_access = {
- dictionary = function(d,document,r)
- return some_dictionary(d:getDict(),document,r)
- end,
- array = function(a,document,r)
- return some_array(a:getArray(),document,r)
- end,
- stream = function(v,document,r)
- return some_stream(v,document,r)
- end,
- real = function(v)
- return v:getReal()
- end,
- integer = function(v)
- return v:getNum()
- end,
- string = function(v)
- return toutf(v:getString())
- end,
- boolean = function(v)
- return v:getBool()
- end,
- name = function(v)
- return v:getName()
- end,
- ref = function(v)
- return v:getRef()
- end,
- null = function()
- return nil
- end,
-}
-
--- checked_access.real = epdf.real
--- checked_access.integer = epdf.integer
--- checked_access.string = epdf.string
--- checked_access.boolean = epdf.boolean
--- checked_access.name = epdf.name
--- checked_access.ref = epdf.ref
-
-local function getnames(document,n,target) -- direct
- if n then
- local Names = n.Names
- if Names then
- if not target then
- target = { }
- end
- for i=1,Names.n,2 do
- target[Names[i]] = Names[i+1]
- end
- else
- local Kids = n.Kids
- if Kids then
- for i=1,Kids.n do
- target = getnames(document,Kids[i],target)
- end
- end
- end
- return target
- end
-end
-
-local function getkids(document,n,target) -- direct
- if n then
- local Kids = n.Kids
- if Kids then
- for i=1,Kids.n do
- target = getkids(document,Kids[i],target)
- end
- elseif target then
- target[#target+1] = n
- else
- target = { n }
- end
- return target
- end
-end
-
--- /OCProperties <<
--- /OCGs [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
--- /D <<
--- /Order [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
--- /ON [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
--- /OFF [ ]
--- >>
--- >>
-
-local function getlayers(document)
- local properties = document.Catalog.OCProperties
- if properties then
- local layers = properties.OCGs
- if layers then
- local t = { }
- local n = layers.n
- for i=1,n do
- local layer = layers[i]
---~ print(document.xrefs[layer])
- t[i] = layer.Name
- end
- t.n = n
- return t
- end
- end
-end
-
-local function getpages(document)
- local data = document.data
- local xrefs = document.xrefs
- local cache = document.cache
- local cata = data:getCatalog()
- local xref = data:getXRef()
- local pages = { }
- local nofpages = cata:getNumPages()
- for pagenumber=1,nofpages do
- local pagereference = cata:getPageRef(pagenumber).num
- local pagedata = some_dictionary(xref:fetch(pagereference,0):getDict(),document,pagereference)
- if pagedata then
- pagedata.number = pagenumber
- pages[pagenumber] = pagedata
- xrefs[pagedata] = pagereference
- cache[pagereference] = pagedata
- else
- report_epdf("missing pagedata at slot %i",i)
- end
- end
- pages.n = nofpages
- return pages
-end
-
--- loader
-
-local function delayed(document,tag,f)
- local t = { }
- setmetatable(t, { __index = function(t,k)
- local result = f()
- if result then
- document[tag] = result
- return result[k]
- end
- end } )
- return t
-end
-
-local loaded = { }
-
-function lpdf.epdf.load(filename)
- local document = loaded[filename]
- if not document then
- statistics.starttiming(lpdf.epdf)
- local data = epdf.open(filename) -- maybe resolvers.find_file
- if data then
- document = {
- filename = filename,
- cache = { },
- xrefs = { },
- data = data,
- }
- local Catalog = some_dictionary(data:getXRef():getCatalog():getDict(),document)
- local Info = some_dictionary(data:getXRef():getDocInfo():getDict(),document)
- document.Catalog = Catalog
- document.Info = Info
- -- document.catalog = Catalog
- -- a few handy helper tables
- document.pages = delayed(document,"pages", function() return getpages(document) end)
- document.destinations = delayed(document,"destinations", function() return getnames(document,Catalog.Names and Catalog.Names.Dests) end)
- document.javascripts = delayed(document,"javascripts", function() return getnames(document,Catalog.Names and Catalog.Names.JS) end)
- document.widgets = delayed(document,"widgets", function() return getnames(document,Catalog.Names and Catalog.Names.AcroForm) end)
- document.embeddedfiles = delayed(document,"embeddedfiles",function() return getnames(document,Catalog.Names and Catalog.Names.EmbeddedFiles) end)
- document.layers = delayed(document,"layers", function() return getlayers(document) end)
- else
- document = false
- end
- loaded[filename] = document
- statistics.stoptiming(lpdf.epdf)
- -- print(statistics.elapsedtime(lpdf.epdf))
- end
- return document
-end
-
--- for k, v in next, expand(t) do
-
-function lpdf.epdf.expand(t)
- if type(t) == "table" then
- local dummy = t.dummy
- end
- return t
-end
-
--- helpers
-
--- function lpdf.epdf.getdestinationpage(document,name)
--- local destination = document.data:findDest(name)
--- return destination and destination.number
--- end
+if not modules then modules = { } end modules ['lpdf-epd'] = {
+ version = 1.001,
+ comment = "companion to lpdf-epa.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- This is an experimental layer around the epdf library. The reason for
+-- this layer is that I want to be independent of the library (which
+-- implements a selection of what a file provides) and also because I
+-- want an interface closer to Lua's table model while the API stays
+-- close to the original xpdf library. Of course, after prototyping a
+-- solution, we can optimize it using the low level epdf accessors.
+
+-- It will be handy when we have a __length and __next that can trigger
+-- the resolve till then we will provide .n as #.
+
+-- As there can be references to the parent we cannot expand a tree. I
+-- played with some expansion variants but it does to pay off.
+
+-- Maybe we need a close().
+-- We cannot access all destinations in one run.
+
+local setmetatable, rawset, rawget, tostring, tonumber = setmetatable, rawset, rawget, tostring, tonumber
+local lower, match, char, find, sub = string.lower, string.match, string.char, string.find, string.sub
+local concat = table.concat
+local toutf = string.toutf
+
+local report_epdf = logs.reporter("epdf")
+
+-- a bit of protection
+
+local limited = false
+
+directives.register("system.inputmode", function(v)
+ if not limited then
+ local i_limiter = io.i_limiter(v)
+ if i_limiter then
+ epdf.open = i_limiter.protect(epdf.open)
+ limited = true
+ end
+ end
+end)
+
+--
+
+function epdf.type(o)
+ local t = lower(match(tostring(o),"[^ :]+"))
+ return t or "?"
+end
+
+lpdf = lpdf or { }
+local lpdf = lpdf
+
+lpdf.epdf = { }
+
+local checked_access
+
+local function prepare(document,d,t,n,k)
+ for i=1,n do
+ local v = d:getVal(i)
+ local r = d:getValNF(i)
+ if r:getTypeName() == "ref" then
+ r = r:getRef().num
+ local c = document.cache[r]
+ if c then
+ --
+ else
+ c = checked_access[v:getTypeName()](v,document,r)
+ if c then
+ document.cache[r] = c
+ document.xrefs[c] = r
+ end
+ end
+ t[d:getKey(i)] = c
+ else
+ t[d:getKey(i)] = checked_access[v:getTypeName()](v,document)
+ end
+ end
+ getmetatable(t).__index = nil
+ return t[k]
+end
+
+local function some_dictionary(d,document,r)
+ local n = d and d:getLength() or 0
+ if n > 0 then
+ local t = { }
+ setmetatable(t, { __index = function(t,k) return prepare(document,d,t,n,k) end } )
+ return t
+ end
+end
+
+local done = { }
+
+local function prepare(document,a,t,n,k)
+ for i=1,n do
+ local v = a:get(i)
+ local r = a:getNF(i)
+ if v:getTypeName() == "null" then
+ -- TH: weird, but appears possible
+ elseif r:getTypeName() == "ref" then
+ r = r:getRef().num
+ local c = document.cache[r]
+ if c then
+ --
+ else
+ c = checked_access[v:getTypeName()](v,document,r)
+ document.cache[r] = c
+ document.xrefs[c] = r
+ end
+ t[i] = c
+ else
+ t[i] = checked_access[v:getTypeName()](v,document)
+ end
+ end
+ getmetatable(t).__index = nil
+ return t[k]
+end
+
+local function some_array(a,document,r)
+ local n = a and a:getLength() or 0
+ if n > 0 then
+ local t = { n = n }
+ setmetatable(t, { __index = function(t,k) return prepare(document,a,t,n,k) end } )
+ return t
+ end
+end
+
+local function streamaccess(s,_,what)
+ if not what or what == "all" or what == "*all" then
+ local t, n = { }, 0
+ s:streamReset()
+ while true do
+ local c = s:streamGetChar()
+ if c < 0 then
+ break
+ else
+ n = n + 1
+ t[n] = char(c)
+ end
+ end
+ return concat(t)
+ end
+end
+
+local function some_stream(d,document,r)
+ if d then
+ d:streamReset()
+ local s = some_dictionary(d:streamGetDict(),document,r)
+ getmetatable(s).__call = function(...) return streamaccess(d,...) end
+ return s
+ end
+end
+
+-- we need epdf.getBool
+
+checked_access = {
+ dictionary = function(d,document,r)
+ return some_dictionary(d:getDict(),document,r)
+ end,
+ array = function(a,document,r)
+ return some_array(a:getArray(),document,r)
+ end,
+ stream = function(v,document,r)
+ return some_stream(v,document,r)
+ end,
+ real = function(v)
+ return v:getReal()
+ end,
+ integer = function(v)
+ return v:getNum()
+ end,
+ string = function(v)
+ return toutf(v:getString())
+ end,
+ boolean = function(v)
+ return v:getBool()
+ end,
+ name = function(v)
+ return v:getName()
+ end,
+ ref = function(v)
+ return v:getRef()
+ end,
+ null = function()
+ return nil
+ end,
+}
+
+-- checked_access.real = epdf.real
+-- checked_access.integer = epdf.integer
+-- checked_access.string = epdf.string
+-- checked_access.boolean = epdf.boolean
+-- checked_access.name = epdf.name
+-- checked_access.ref = epdf.ref
+
+local function getnames(document,n,target) -- direct
+ if n then
+ local Names = n.Names
+ if Names then
+ if not target then
+ target = { }
+ end
+ for i=1,Names.n,2 do
+ target[Names[i]] = Names[i+1]
+ end
+ else
+ local Kids = n.Kids
+ if Kids then
+ for i=1,Kids.n do
+ target = getnames(document,Kids[i],target)
+ end
+ end
+ end
+ return target
+ end
+end
+
+local function getkids(document,n,target) -- direct
+ if n then
+ local Kids = n.Kids
+ if Kids then
+ for i=1,Kids.n do
+ target = getkids(document,Kids[i],target)
+ end
+ elseif target then
+ target[#target+1] = n
+ else
+ target = { n }
+ end
+ return target
+ end
+end
+
+-- /OCProperties <<
+-- /OCGs [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
+-- /D <<
+-- /Order [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
+-- /ON [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 25 0 R 27 0 R ]
+-- /OFF [ ]
+-- >>
+-- >>
+
+local function getlayers(document)
+ local properties = document.Catalog.OCProperties
+ if properties then
+ local layers = properties.OCGs
+ if layers then
+ local t = { }
+ local n = layers.n
+ for i=1,n do
+ local layer = layers[i]
+--~ print(document.xrefs[layer])
+ t[i] = layer.Name
+ end
+ t.n = n
+ return t
+ end
+ end
+end
+
+local function getpages(document)
+ local data = document.data
+ local xrefs = document.xrefs
+ local cache = document.cache
+ local cata = data:getCatalog()
+ local xref = data:getXRef()
+ local pages = { }
+ local nofpages = cata:getNumPages()
+ for pagenumber=1,nofpages do
+ local pagereference = cata:getPageRef(pagenumber).num
+ local pagedata = some_dictionary(xref:fetch(pagereference,0):getDict(),document,pagereference)
+ if pagedata then
+ pagedata.number = pagenumber
+ pages[pagenumber] = pagedata
+ xrefs[pagedata] = pagereference
+ cache[pagereference] = pagedata
+ else
+ report_epdf("missing pagedata at slot %i",i)
+ end
+ end
+ pages.n = nofpages
+ return pages
+end
+
+-- loader
+
+local function delayed(document,tag,f)
+ local t = { }
+ setmetatable(t, { __index = function(t,k)
+ local result = f()
+ if result then
+ document[tag] = result
+ return result[k]
+ end
+ end } )
+ return t
+end
+
+local loaded = { }
+
+function lpdf.epdf.load(filename)
+ local document = loaded[filename]
+ if not document then
+ statistics.starttiming(lpdf.epdf)
+ local data = epdf.open(filename) -- maybe resolvers.find_file
+ if data then
+ document = {
+ filename = filename,
+ cache = { },
+ xrefs = { },
+ data = data,
+ }
+ local Catalog = some_dictionary(data:getXRef():getCatalog():getDict(),document)
+ local Info = some_dictionary(data:getXRef():getDocInfo():getDict(),document)
+ document.Catalog = Catalog
+ document.Info = Info
+ -- document.catalog = Catalog
+ -- a few handy helper tables
+ document.pages = delayed(document,"pages", function() return getpages(document) end)
+ document.destinations = delayed(document,"destinations", function() return getnames(document,Catalog.Names and Catalog.Names.Dests) end)
+ document.javascripts = delayed(document,"javascripts", function() return getnames(document,Catalog.Names and Catalog.Names.JS) end)
+ document.widgets = delayed(document,"widgets", function() return getnames(document,Catalog.Names and Catalog.Names.AcroForm) end)
+ document.embeddedfiles = delayed(document,"embeddedfiles",function() return getnames(document,Catalog.Names and Catalog.Names.EmbeddedFiles) end)
+ document.layers = delayed(document,"layers", function() return getlayers(document) end)
+ else
+ document = false
+ end
+ loaded[filename] = document
+ statistics.stoptiming(lpdf.epdf)
+ -- print(statistics.elapsedtime(lpdf.epdf))
+ end
+ return document
+end
+
+-- for k, v in next, expand(t) do
+
+function lpdf.epdf.expand(t)
+ if type(t) == "table" then
+ local dummy = t.dummy
+ end
+ return t
+end
+
+-- helpers
+
+-- function lpdf.epdf.getdestinationpage(document,name)
+-- local destination = document.data:findDest(name)
+-- return destination and destination.number
+-- end
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 05:17:50 +0000