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Merge pull request #5187 from nnethercote/EI-checking

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Reduce ASCII checks in makeInlineImage().
This commit is contained in:
Yury Delendik 2014-08-15 08:29:03 -05:00
commit 992e7613c1
1 changed files with 23 additions and 22 deletions
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45
src/core/parser.js
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@ -18,7 +18,7 @@
FlateStream, isArray, isCmd, isDict, isInt, isName, isNum, isRef,
isString, Jbig2Stream, JpegStream, JpxStream, LZWStream, Name,
NullStream, PredictorStream, Ref, RunLengthStream, warn, info,
StreamType, MissingDataException */
StreamType, MissingDataException, assert */
'use strict';
@ -152,32 +152,33 @@ var Parser = (function ParserClosure() {
// searching for the /EI\s/
var state = 0, ch, i, ii;
while (state !== 4 && (ch = stream.getByte()) !== -1) {
switch (ch | 0) {
case 0x20:
case 0x0D:
case 0x0A:
// let's check next five bytes to be ASCII... just be sure
var followingBytes = stream.peekBytes(5);
for (i = 0, ii = followingBytes.length; i < ii; i++) {
var E = 0x45, I = 0x49, SPACE = 0x20, NL = 0xA, CR = 0xD;
while ((ch = stream.getByte()) !== -1) {
if (state === 0) {
state = (ch === E) ? 1 : 0;
} else if (state === 1) {
state = (ch === I) ? 2 : 0;
} else {
assert(state === 2);
if (ch === SPACE || ch === NL || ch === CR) {
// Let's check the next five bytes are ASCII... just be sure.
var n = 5;
var followingBytes = stream.peekBytes(n);
for (i = 0; i < n; i++) {
ch = followingBytes[i];
if (ch !== 0x0A && ch !== 0x0D && (ch < 0x20 || ch > 0x7F)) {
// not a LF, CR, SPACE or any visible ASCII character
if (ch !== NL && ch !== CR && (ch < SPACE || ch > 0x7F)) {
// Not a LF, CR, SPACE or any visible ASCII character, i.e.
// it's binary stuff. Resetting the state.
state = 0;
break; // some binary stuff found, resetting the state
break;
}
}
state = (state === 3 ? 4 : 0);
break;
case 0x45:
state = 2;
break;
case 0x49:
state = (state === 2 ? 3 : 0);
break;
default:
if (state === 2) {
break; // finished!
}
} else {
state = 0;
break;
}
}
}