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Fix LZMA decompression

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Bill 2022-02-02 11:54:59 -05:00
parent c22657e549
commit 0ec96fc77b
1 changed files with 56 additions and 4 deletions
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60
src/swf/UncompressSWF.ts
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@ -1,4 +1,5 @@
import lzma from 'lzma-purejs'; import * as lzma from 'lzma-purejs';
import { Stream } from 'stream';
import { promisify } from 'util'; import { promisify } from 'util';
import { unzip } from 'zlib'; import { unzip } from 'zlib';
import { ReadSWFBuff } from './ReadSWFBuffer'; import { ReadSWFBuff } from './ReadSWFBuffer';
@ -8,12 +9,12 @@ export const UncompressSWF = async (rawBuffer: Buffer) =>
{ {
if(!Buffer.isBuffer(rawBuffer)) return null; if(!Buffer.isBuffer(rawBuffer)) return null;
const compressed_buff = rawBuffer.slice(8); let compressedBuffer = rawBuffer.slice(8);
switch(rawBuffer[0]) switch(rawBuffer[0])
{ {
case 0x43: { // zlib compressed case 0x43: { // zlib compressed
const buffer = await (promisify(unzip)(compressed_buff)); const buffer = await (promisify(unzip)(compressedBuffer));
if(!Buffer.isBuffer(buffer)) return null; if(!Buffer.isBuffer(buffer)) return null;
@ -22,7 +23,58 @@ export const UncompressSWF = async (rawBuffer: Buffer) =>
case 0x46: // uncompressed case 0x46: // uncompressed
return ReadSWFBuff(new SWFBuffer(rawBuffer), rawBuffer); return ReadSWFBuff(new SWFBuffer(rawBuffer), rawBuffer);
case 0x5a: { // LZMA compressed case 0x5a: { // LZMA compressed
const buffer = Buffer.concat([ rawBuffer.slice(0, 8), lzma.decompressFile(compressed_buff) ]); const lzmaProperties = compressedBuffer.slice(4, 9);
compressedBuffer = compressedBuffer.slice(9);
const inputStream = new Stream();
let inputPos = 0;
//@ts-ignore
inputStream.readByte = () =>
{
return inputPos >= compressedBuffer.length ? -1 : compressedBuffer[inputPos++];
};
const outputStream = new Stream();
let outputBuffer = Buffer.alloc(16384);
let outputPos = 0;
//@ts-ignore
outputStream.writeByte = (_byte: number) =>
{
if(outputPos >= outputBuffer.length)
{
const newBuffer = Buffer.alloc(outputBuffer.length * 2);
outputBuffer.copy(newBuffer);
outputBuffer = newBuffer;
}
outputBuffer[outputPos++] = _byte;
return true;
};
//@ts-ignore
outputStream.getBuffer = () =>
{
// trim buffer
if(outputPos !== outputBuffer.length)
{
const newBuffer = Buffer.alloc(outputPos);
outputBuffer.copy(newBuffer, 0, 0, outputPos);
outputBuffer = newBuffer;
}
return outputBuffer;
};
lzma.decompress(lzmaProperties, inputStream, outputStream, -1);
//@ts-ignore
const buffer = Buffer.concat([ rawBuffer.slice(0, 8), outputStream.getBuffer() ]);
if(!Buffer.isBuffer(buffer)) return null; if(!Buffer.isBuffer(buffer)) return null;