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Merge pull request #3376 from yurydelendik/bad-pdfs

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Misc fixes for corrupted PDFs
This commit is contained in:
Brendan Dahl 2013-06-27 15:33:06 -07:00
commit f06dadab3b
5 changed files with 71 additions and 7 deletions
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44
src/parser.js
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@ -217,9 +217,47 @@ var Parser = (function ParserClosure() {
stream.pos = pos + length;
this.shift(); // '>>'
this.shift(); // 'stream'
if (!isCmd(this.buf1, 'endstream'))
error('Missing endstream');
this.shift();
if (!isCmd(this.buf1, 'endstream')) {
// bad stream length, scanning for endstream
stream.pos = pos;
var SCAN_BLOCK_SIZE = 2048;
var ENDSTREAM_SIGNATURE_LENGTH = 9;
var ENDSTREAM_SIGNATURE = [0x65, 0x6E, 0x64, 0x73, 0x74, 0x72, 0x65,
0x61, 0x6D];
var skipped = 0, found = false;
while (stream.pos < stream.end) {
var scanBytes = stream.peekBytes(SCAN_BLOCK_SIZE);
var scanLength = scanBytes.length - ENDSTREAM_SIGNATURE_LENGTH;
var found = false, i, ii, j;
for (i = 0, j = 0; i < scanLength; i++) {
var b = scanBytes[i];
if (b !== ENDSTREAM_SIGNATURE[j]) {
i -= j;
j = 0;
} else {
j++;
if (j >= ENDSTREAM_SIGNATURE_LENGTH) {
found = true;
break;
}
}
}
if (found) {
skipped += i - ENDSTREAM_SIGNATURE_LENGTH;
stream.pos += i - ENDSTREAM_SIGNATURE_LENGTH;
break;
}
skipped += scanLength;
stream.pos += scanLength;
}
if (!found) {
error('Missing endstream');
}
length = skipped;
this.shift();
this.shift();
}
this.shift(); // 'endstream'
stream = stream.makeSubStream(pos, length, dict);
if (cipherTransform)