public static BinaryReader Decompress(BinaryReader br, int size, int outsize, out int compressLevel)
{
if (input.Length < size)
{
input = new byte[size];
}
if (output.Length < outsize)
{
output = new byte[outsize];
}
int n = br.Read(input, 0, size);
ms.Position = 0;
ms.Write(input, 0, n);
ms.SetLength(n);
ms.Position = 0;
using (var inf = new Ionic.Zlib.ZlibStream(ms, Ionic.Zlib.CompressionMode.Decompress, Ionic.Zlib.CompressionLevel.Default, true))
{
n = inf.Read(output, 0, output.Length);
if (n != outsize)
Trace.Write("Compression Output does not match expected size");
compressLevel = (int)Ionic.Zlib.CompressionLevel.Default;
}
ms.Position = 0;
ms.Write(output, 0, outsize);
ms.SetLength(outsize);
ms.Position = 0;
return compReader;
}
public static BinaryReader Decompress(BinaryReader br, int size, int outsize, out int compressLevel)
{
if (input.Length < size)
{
input = new byte[size];
}
if (output.Length < outsize)
{
output = new byte[outsize];
}
int n = br.Read(input, 0, size);
ms.Position = 0;
ms.Write(input, 0, n);
ms.SetLength(n);
ms.Position = 0;
using (var inf = new Ionic.Zlib.ZlibStream(ms, Ionic.Zlib.CompressionMode.Decompress, Ionic.Zlib.CompressionLevel.Default, true))
{
n = inf.Read(output, 0, output.Length);
if (n != outsize)
{
Trace.Write("Compression Output does not match expected size");
}
compressLevel = (int)Ionic.Zlib.CompressionLevel.Default;
}
ms.Position = 0;
ms.Write(output, 0, outsize);
ms.SetLength(outsize);
ms.Position = 0;
return(compReader);
}
public static string DecompressZlib(Stream input, Encoding e)
{
using (Ionic.Zlib.ZlibStream decompressor = new Ionic.Zlib.ZlibStream(input, Ionic.Zlib.CompressionMode.Decompress))
{
int read = 0;
var buffer = new byte[BUFFER_SIZE];
using (MemoryStream output = new MemoryStream())
{
while ((read = decompressor.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, read);
}
return(e.GetString(output.ToArray()));
}
}
}
public byte[] GetContents()
{
BinaryReader reader = new BinaryReader(File.Open(Parent.Path, FileMode.Open, FileAccess.Read));
reader.BaseStream.Seek(Offset, SeekOrigin.Begin);
byte[] buffer = reader.ReadBytes((Int32)Size);
reader.Close();
if (IsCompressed)
{
using (MemoryStream compressedStream = new MemoryStream(buffer))
{
using (Ionic.Zlib.ZlibStream zlibStream = new Ionic.Zlib.ZlibStream(compressedStream, Ionic.Zlib.CompressionMode.Decompress))
{
byte[] decompressed = new byte[SizeUncompressed];
zlibStream.Read(decompressed, 0, (Int32)SizeUncompressed);
return(decompressed);
}
}
}
return(buffer);
}
public static string DecompressZlib(Stream input, Encoding e)
{
using (Ionic.Zlib.ZlibStream decompressor = new Ionic.Zlib.ZlibStream(input, Ionic.Zlib.CompressionMode.Decompress))
{
int read = 0;
var buffer = new byte[BUFFER_SIZE];
using (MemoryStream output = new MemoryStream())
{
while ((read = decompressor.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, read);
}
return e.GetString(output.ToArray());
}
}
}
public void GetSwf()
{
try
{
// check if we can retrieve
if (string.IsNullOrEmpty(swfUrl)) return;
Uri swfUri = new Uri(swfUrl);
if (swfCache.ContainsKey(swfUrl))
{
SWFHash = swfCache[swfUrl].Hash;
SWFSize = swfCache[swfUrl].Size;
}
else
{
// get the swf file from the web
HttpWebRequest request = WebRequest.Create(swfUri) as HttpWebRequest;
if (request == null) return;
request.Accept = "*/*";
request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
request.Timeout = 5000; // don't wait longer than 5 seconds
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
System.IO.Stream responseStream;
if (response.ContentEncoding.ToLower().Contains("gzip"))
responseStream = new System.IO.Compression.GZipStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
else if (response.ContentEncoding.ToLower().Contains("deflate"))
responseStream = new System.IO.Compression.DeflateStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
else
responseStream = response.GetResponseStream();
byte[] tempBuff = new byte[1024 * 1024 * 10];
int bytesRead = 0;
int totalBytesRead = 0;
while ((bytesRead = responseStream.Read(tempBuff, totalBytesRead, tempBuff.Length - totalBytesRead)) > 0)
{
totalBytesRead += bytesRead;
}
byte[] buff = new byte[totalBytesRead];
Array.Copy(tempBuff, buff, totalBytesRead);
MemoryStream ms = new MemoryStream(buff);
BinaryReader br = new BinaryReader(ms);
// compressed swf?
if (br.PeekChar() == 'C')
{
// read size
br.BaseStream.Position = 4; // skip signature
SWFSize = Convert.ToInt32(br.ReadUInt32());
// read swf head
byte[] uncompressed = new byte[SWFSize];
br.BaseStream.Position = 0;
br.Read(uncompressed, 0, 8); // header data is not compressed
uncompressed[0] = System.Text.Encoding.ASCII.GetBytes(new char[] { 'F' })[0];
// un-zip
byte[] compressed = br.ReadBytes(SWFSize);
Ionic.Zlib.ZlibStream dStream = new Ionic.Zlib.ZlibStream(new MemoryStream(compressed), Ionic.Zlib.CompressionMode.Decompress);
int read = dStream.Read(uncompressed, 8, SWFSize - 8);
byte[] finalUncompressed = new byte[8 + read];
Array.Copy(uncompressed, finalUncompressed, 8 + read);
buff = finalUncompressed;
}
System.Security.Cryptography.HMACSHA256 sha256Hmac = new System.Security.Cryptography.HMACSHA256(System.Text.Encoding.ASCII.GetBytes("Genuine Adobe Flash Player 001"));
SWFHash = sha256Hmac.ComputeHash(buff);
Logger.Log(string.Format("Size of decompressed SWF: {0}, Hash:", SWFSize));
Logger.LogHex(SWFHash, 0, SWFHash.Length);
swfCache.Add(swfUrl, new SwFInfo() { Hash = SWFHash, Size = SWFSize, Time = DateTime.Now });
}
}
catch (Exception ex)
{
Logger.Log(string.Format("Error while getting swf ({0}): {1}", swfUrl, ex.Message));
}
}
