Sakurai/pdf.js
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fix a bunch of bugs and make startxref parsing work

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This commit is contained in:
Andreas Gal 2011-05-06 02:18:31 -07:00
parent 4a5794e705
commit 860c8129bf
1 changed files with 32 additions and 20 deletions
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52
pdf.js
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@ -42,7 +42,7 @@ var Stream = (function() {
getChar: function() {
var ch = this.lookChar();
this.pos++;
return String.fromCharCode(ch);
return ch;
},
putBack: function() {
this.pos--;
@ -54,10 +54,10 @@ var Stream = (function() {
this.pos += n;
},
moveStart: function() {
this.bytes = Uint8Array(bytes, pos);
this.bytes = Uint8Array(this.bytes, this.pos);
this.pos = 0;
},
find: function(str, limit, backwards) {
find: function(needle, limit, backwards) {
var length = this.bytes.length;
var pos = this.pos;
var str = "";
@ -65,7 +65,8 @@ var Stream = (function() {
limit = length - pos;
for (var n = 0; n < limit; ++n)
str += this.getChar();
var index = backwards ? str.lastIndexOf(str) : str.indexOf(str);
this.pos = pos;
var index = backwards ? str.lastIndexOf(needle) : str.indexOf(needle);
if (index == -1)
return false; /* not found */
this.pos += index;
@ -74,7 +75,7 @@ var Stream = (function() {
};
return constructor;
});
})();
var Obj = (function() {
function constructor(type, value) {
@ -201,7 +202,7 @@ var Lexer = (function() {
break;
}
} while (true);
var value = parseNumber(str);
var value = parseFloat(str);
if (isNaN(value))
return Obj.errorObj;
if (floating) {
@ -304,7 +305,7 @@ var Lexer = (function() {
getName: function(ch) {
var str = "";
var stream = this.stream;
while (!!(ch = stream.lookChar()) && !specialChars[ch.toCharCode()]) {
while (!!(ch = stream.lookChar()) && !specialChars[ch.charCodeAt(0)]) {
stream.getChar();
if (ch == "#") {
ch = stream.lookChar();
@ -353,8 +354,8 @@ var Lexer = (function() {
// skip whitespace and comments
var comment = false;
var stream = this.stream;
var ch;
while (true) {
var ch;
if (!(ch = stream.getChar()))
return new Obj(Object.EOF);
if (comment) {
@ -362,13 +363,13 @@ var Lexer = (function() {
comment = false;
} else if (ch == '%') {
comment = true;
} else if (specialChars[ch.chatCodeAt(0)] != 1) {
} else if (specialChars[ch.charCodeAt(0)] != 1) {
break;
}
}
// start reading token
switch (c) {
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '+': case '-': case '.':
@ -407,7 +408,7 @@ var Lexer = (function() {
// command
var str = ch;
while (!!(ch = stream.lookChar()) && !specialChars[ch.toCharCode()]) {
while (!!(ch = stream.lookChar()) && !specialChars[ch.charCodeAt(0)]) {
stream.getChar();
if (str.length == 128) {
error("Command token too long");
@ -438,8 +439,8 @@ var Parser = (function() {
constructor.prototype = {
refill: function() {
this.buf1 = lexer.getObj();
this.buf2 = lexer.getObj();
this.buf1 = this.lexer.getObj();
this.buf2 = this.lexer.getObj();
},
shift: function() {
if (this.inlineImg > 0) {
@ -539,8 +540,8 @@ var Linearization = (function () {
var obj2 = this.parser.getObj();
var obj3 = this.parser.getObj();
this.linDict = this.parser.getObj();
if (obj1.isInt() && obj2.isInt() && obj3.isCmd("obj") && linDict.isDict()) {
var obj = linDict.lookup("Linearized");
if (obj1.isInt() && obj2.isInt() && obj3.isCmd("obj") && this.linDict.isDict()) {
var obj = this.linDict.lookup("Linearized");
if (!(obj.isNum() && obj.value > 0))
this.linDict = Obj.nullObj;
}
@ -550,7 +551,7 @@ var Linearization = (function () {
getInt: function(name) {
var linDict = this.linDict;
var obj;
if (!linDict.isDict() &&
if (linDict.isDict() &&
(obj = linDict.lookup(name)).isInt() &&
obj.value > 0) {
return length;
@ -572,6 +573,8 @@ var Linearization = (function () {
return 0;
},
get length() {
if (!this.linDict.isDict())
return 0;
return this.getInt("L");
},
get hintsOffset() {
@ -602,11 +605,14 @@ var Linearization = (function () {
return this.getInt("P");
}
};
return constructor;
})();
var PDFDoc = (function () {
function constructor(stream) {
this.setup(stream);
this.stream = stream;
this.setup();
}
constructor.prototype = {
@ -622,6 +628,7 @@ var PDFDoc = (function () {
return this.linearization = linearization;
},
get startXRef() {
var stream = this.stream;
var startXRef = 0;
var linearization = this.linearization;
if (linearization) {
@ -645,7 +652,7 @@ var PDFDoc = (function () {
str += ch;
ch = stream.getChar();
}
startXRef = parseNumber(str);
startXRef = parseInt(str);
if (isNaN(startXRef))
startXRef = 0;
}
@ -655,7 +662,8 @@ var PDFDoc = (function () {
},
// Find the header, remove leading garbage and setup the stream
// starting from the header.
checkHeader: function(stream) {
checkHeader: function() {
var stream = this.stream;
stream.reset();
if (stream.find("%PDF-", 1024)) {
// Found the header, trim off any garbage before it.
@ -664,12 +672,14 @@ var PDFDoc = (function () {
}
// May not be a PDF file, continue anyway.
this.stream = stream;
},
setup: function(arrayBuffer, ownerPassword, userPassword) {
this.checkHeader(arrayBuffer);
print(this.startXRef);
}
};
return constructor;
})();
var Interpreter = (function() {
@ -1225,6 +1235,8 @@ function runEchoTests() {
}
function runParseTests() {
var data = snarf("simple_graphics.pdf", "binary");
var pdf = new PDFDoc(new Stream(data));
}
if ("arguments" in this) {