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Merge branch 'BiFi2000-master-patch-27063' into 'master'

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optimize zlib inflate, the old code would get stuck on malformed swfs

See merge request nitro/nitro-converter!4
This commit is contained in:
Bill 2021-08-06 06:05:42 +00:00
commit 450d306cc8
1 changed files with 432 additions and 450 deletions
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24
src/swf-reader/index.js
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@ -335,27 +335,9 @@ function uncompress(swf, next) {
return readSWFBuff(new SWFBuffer(uncompressed_buff), swf);
}
const newBuffer = swf.slice(4);
const uncompressedLength = newBuffer.readUInt32LE();
const chunks = [];
let readLength = 0;
var decompressStream = zlib.createInflate()
.on('data', function (chunk) {
readLength += chunk.length;
chunks.push(chunk);
if (uncompressedLength - 8 === readLength) {
decompressStream.close();
}
//decompressStream.pause();
}).on('error', function(err) {
console.log(err);
//next(err);
}).on('close', function() {
readSWFBuff(new SWFBuffer( Buffer.concat(chunks) ), swf, next);
});
decompressStream.write(compressed_buff);
zlib.inflate(compressed_buff, function(err, buf) {
readSWFBuff(new SWFBuffer(buf), swf, next);
});
break;
case 0x46 : // uncompressed
return readSWFBuff(new SWFBuffer( swf ), swf, next);