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more XRef parsing

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This commit is contained in:
Andreas Gal 2011-05-06 16:38:16 -07:00
parent 16b3a7abc4
commit 4349a5b2bc
1 changed files with 43 additions and 1 deletions
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44
pdf.js
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@ -178,6 +178,7 @@ var Lexer = (function() {
constructor.prototype = {
error: function(msg) {
// TODO
print(msg);
},
getNumber: function(ch) {
var floating = false;
@ -611,15 +612,57 @@ var Linearization = (function () {
var XRef = (function () {
function constructor(stream, startXRef, mainXRefEntriesOffset) {
this.entries = [];
this.readXRef(stream, startXRef);
}
constructor.prototype = {
readXRefTable: function(parser) {
while (true) {
var obj;
if ((obj = parser.getObj()).isCmd("trailer"))
break;
if (!obj.isInt())
return false;
var first = obj.value;
if (!(obj = parser.getObj()).isInt())
return false;
var n = obj.value;
if (first < 0 || n < 0 || (first + n) != ((first + n) | 0))
return false;
for (var i = first; i < first + n; ++i) {
var entry = {};
if (!(obj = parser.getObj()).isInt())
return false;
entry.offset = obj.value;
if (!(obj = parser.getObj()).isInt())
return false;
entry.gen = obj.value;
obj = parser.getObj();
if (obj.isCmd("n")) {
entry.uncompressed = true;
} else if (obj.isCmd("f")) {
entry.free = true;
} else {
return false;
}
if (!this.entries[i]) {
// In some buggy PDF files the xref table claims to start at 1
// instead of 0.
if (i == 1 && first == 1 &&
entry.offset == 0 && entry.gen == 65535 && entry.free) {
i = first = 0;
}
this.entries[i] = entry;
}
}
}
// read the trailer dictionary
this.ok = true;
return true;
},
readXRefStream: function(parser) {
// TODO
this.ok = true;
return true;
},
@ -715,7 +758,6 @@ var PDFDoc = (function () {
stream.moveStart();
return;
}
// May not be a PDF file, continue anyway.
},
setup: function(ownerPassword, userPassword) {