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add code to access the page dictionary

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This commit is contained in:
Andreas Gal 2011-05-11 01:50:47 -07:00
parent db5488a50e
commit 7c604ae280
1 changed files with 48 additions and 13 deletions
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61
pdf.js
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@ -1589,12 +1589,11 @@ var XRef = (function() {
this.readXRef(startXRef);
// get the root dictionary (catalog) object
var ref = this.trailerDict.get("Root");
this.rootNum = ref.num;
this.rootGen = ref.gen;
if (!IsRef(this.root = this.trailerDict.get("Root")))
error("Invalid root reference");
// set the xref for the trailer dictionary
this.trailerDict.xref = this;
// prepare the XRef cache
this.cache = Object.create(null);
}
constructor.prototype = {
@ -1697,8 +1696,13 @@ var XRef = (function() {
error("reading an XRef stream not implemented yet");
return e;
},
fetch: function(num, gen) {
var e = this.getEntry(num);
fetch: function(ref) {
var num = ref.num;
var e = this.cache[num];
if (e)
return e;
e = this.getEntry(num);
var gen = ref.gen;
if (e.uncompressed) {
if (e.gen != gen)
throw("inconsistent generation in XRef");
@ -1721,11 +1725,12 @@ var XRef = (function() {
}
error("bad XRef entry");
}
return parser.getObj();
return this.cache[num] = parser.getObj();
}
error("compressed entry");
},
getCatalogObj: function() {
return this.fetch(this.rootNum, this.rootGen);
return this.fetch(this.root);
}
};
@ -1735,13 +1740,30 @@ var XRef = (function() {
var Catalog = (function() {
function constructor(xref) {
this.xref = xref;
var dict = xref.getCatalogObj();
if (!IsDict(dict))
error("bad catalog");
this.catDict = dict;
var obj = xref.getCatalogObj();
if (!IsDict(obj))
error("catalog object is not a dictionary");
this.catDict = obj;
}
constructor.prototype = {
get pagesDict() {
var obj = this.catDict.get("Pages");
if (!IsRef(obj))
error("invalid top-level pages reference");
var obj = this.xref.fetch(obj);
if (!IsDict(obj))
error("invalid top-level pages dictionary");
// shadow the prototype getter
return this.pagesDict = obj;
},
get numPages() {
obj = this.pagesDict.get("Count");
if (!IsInt(obj))
error("page count in top level pages object is not an integer");
// shadow the prototype getter
return this.numPages = obj;
}
};
return constructor;
@ -1840,6 +1862,18 @@ var PDFDoc = (function() {
this.startXRef,
this.mainXRefEntriesOffset);
this.catalog = new Catalog(this.xref);
},
get numPages() {
var linearization = this.linearization;
var num = linearization
? linearization.numPages
: this.catalog.numPages;
// overwrite the prototype getter
return this.numPages = num;
},
getPage: function(page) {
print(this.numPages);
// TODO
}
};
@ -2631,6 +2665,7 @@ function runParseTests() {
//var data = snarf("simple_graphics.pdf", "binary");
var data = snarf("/tmp/paper.pdf", "binary");
var pdf = new PDFDoc(new Stream(data));
pdf.getPage(1);
}
if ("arguments" in this) {