Sakurai/pdf.js
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small optimizations in parser.getObj(), lexer.getObj()

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This commit is contained in:
fkaelberer 2014-05-23 09:25:36 +02:00
parent d2da73b8c4
commit f88118dbf9
1 changed files with 57 additions and 56 deletions
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113
src/core/parser.js
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@ -55,55 +55,58 @@ var Parser = (function ParserClosure() {
}
},
getObj: function Parser_getObj(cipherTransform) {
if (isCmd(this.buf1, 'BI')) { // inline image
this.shift();
return this.makeInlineImage(cipherTransform);
}
if (isCmd(this.buf1, '[')) { // array
this.shift();
var array = [];
while (!isCmd(this.buf1, ']') && !isEOF(this.buf1)) {
array.push(this.getObj(cipherTransform));
}
if (isEOF(this.buf1)) {
error('End of file inside array');
}
this.shift();
return array;
}
if (isCmd(this.buf1, '<<')) { // dictionary or stream
this.shift();
var dict = new Dict(this.xref);
while (!isCmd(this.buf1, '>>') && !isEOF(this.buf1)) {
if (!isName(this.buf1)) {
info('Malformed dictionary: key must be a name object');
var buf1 = this.buf1;
this.shift();
if (buf1 instanceof Cmd) {
switch (buf1.cmd) {
case 'BI': // inline image
return this.makeInlineImage(cipherTransform);
case '[': // array
var array = [];
while (!isCmd(this.buf1, ']') && !isEOF(this.buf1)) {
array.push(this.getObj(cipherTransform));
}
if (isEOF(this.buf1)) {
error('End of file inside array');
}
this.shift();
continue;
}
return array;
case '<<': // dictionary or stream
var dict = new Dict(this.xref);
while (!isCmd(this.buf1, '>>') && !isEOF(this.buf1)) {
if (!isName(this.buf1)) {
info('Malformed dictionary: key must be a name object');
this.shift();
continue;
}
var key = this.buf1.name;
this.shift();
if (isEOF(this.buf1)) {
break;
}
dict.set(key, this.getObj(cipherTransform));
}
if (isEOF(this.buf1)) {
error('End of file inside dictionary');
}
var key = this.buf1.name;
this.shift();
if (isEOF(this.buf1)) {
break;
}
dict.set(key, this.getObj(cipherTransform));
}
if (isEOF(this.buf1)) {
error('End of file inside dictionary');
}
// Stream objects are not allowed inside content streams or
// object streams.
if (isCmd(this.buf2, 'stream')) {
return (this.allowStreams ?
this.makeStream(dict, cipherTransform) : dict);
// Stream objects are not allowed inside content streams or
// object streams.
if (isCmd(this.buf2, 'stream')) {
return (this.allowStreams ?
this.makeStream(dict, cipherTransform) : dict);
}
this.shift();
return dict;
default: // simple object
return buf1;
}
this.shift();
return dict;
}
if (isInt(this.buf1)) { // indirect reference or integer
var num = this.buf1;
this.shift();
if (isInt(buf1)) { // indirect reference or integer
var num = buf1;
if (isInt(this.buf1) && isCmd(this.buf2, 'R')) {
var ref = new Ref(num, this.buf1);
this.shift();
@ -112,9 +115,9 @@ var Parser = (function ParserClosure() {
}
return num;
}
if (isString(this.buf1)) { // string
var str = this.buf1;
this.shift();
if (isString(buf1)) { // string
var str = buf1;
if (cipherTransform) {
str = cipherTransform.decryptString(str);
}
@ -122,9 +125,7 @@ var Parser = (function ParserClosure() {
}
// simple object
var obj = this.buf1;
this.shift();
return obj;
return buf1;
},
makeInlineImage: function Parser_makeInlineImage(cipherTransform) {
var lexer = this.lexer;
@ -629,7 +630,7 @@ var Lexer = (function LexerClosure() {
var x = toHexDigit(ch);
if (x != -1) {
var x2 = toHexDigit(this.nextChar());
if (x2 == -1) {
if (x2 === -1) {
error('Illegal digit in hex char in name: ' + x2);
}
strBuf.push(String.fromCharCode((x << 4) | x2));
@ -695,7 +696,7 @@ var Lexer = (function LexerClosure() {
return EOF;
}
if (comment) {
if (ch === 0x0A || ch == 0x0D) { // LF, CR
if (ch === 0x0A || ch === 0x0D) { // LF, CR
comment = false;
}
} else if (ch === 0x25) { // '%'
@ -762,19 +763,19 @@ var Lexer = (function LexerClosure() {
if (knownCommandFound && !(possibleCommand in knownCommands)) {
break;
}
if (str.length == 128) {
if (str.length === 128) {
error('Command token too long: ' + str.length);
}
str = possibleCommand;
knownCommandFound = knownCommands && (str in knownCommands);
}
if (str == 'true') {
if (str === 'true') {
return true;
}
if (str == 'false') {
if (str === 'false') {
return false;
}
if (str == 'null') {
if (str === 'null') {
return null;
}
return Cmd.get(str);