This class requires ICSharpCode.SharpZipLib.dll. You can download it from here or ICSharpCode.
- Use GetDimensions(String filePath) method whenever you want the dimensions of the swf file that resides on your server. Give the complete file path as a parameter.
- Use GetDimensions(Stream stream) method whenever you want to find the swf file dimensions from the input stream (Ex: Asp.net file upload control's PostedFile.InputStream object.), it can be of any inputStream. Here you no need to save the file on to the server.
Usage:
//Use when the file resides on your server.
try
{
SwfParser swfParser = new SwfParser();
Rectangle rectangle = swfParser.GetDimensions(filePath);
int width=rectangle.Width;
int height=rectangle.Height;
}
catch (Exception ex)
{
return "There is a problem with the swf file.";
}
//Use when you want to use file upload control's input stream.(it may be any input stream)
try
{
SwfParser swfParser = new SwfParser();
Rectangle rectangle = swfParser.GetDimensions(uploadedfile.PostedFile.InputStream);
int width=rectangle.Width;
int height=rectangle.Height;
}
catch (Exception ex)
{
return "There is a problem with the swf file.";
}
Here is the SwfParser class:
using System;
using System.Text;
using System.IO;
using System.Drawing;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
public class SwfParser
{
public Rectangle GetDimensions(String filePath)
{
using (FileStream stream = File.OpenRead(filePath))
{
return GetDimensions(stream);
}
}
public Rectangle GetDimensions(Stream stream)
{
Stream inputStream = null;
byte[] signature = new byte[8];
byte[] rect = new byte[8];
stream.Read(signature, 0, 8);
if ("CWS" == System.Text.Encoding.ASCII.GetString(signature, 0, 3))
{
inputStream = new InflaterInputStream(stream);
}
else
{
inputStream = stream;
}
inputStream.Read(rect, 0, 8);
int nbits = rect[0] >> 3;
rect[0] = (byte)(rect[0] & 0x07);
String bits = ByteArrayToBitString(rect);
bits = bits.Remove(0, 5);
int[] dims = new int[4];
for (int i = 0; i < 4; i++)
{
char[] dest = new char[nbits];
bits.CopyTo(0, dest, 0, bits.Length>nbits ? nbits : bits.Length);
bits = bits.Remove(0, bits.Length > nbits ? nbits : bits.Length);
dims[i] = BitStringToInteger(new String(dest)) / 20;
}
return new Rectangle(0, 0, dims[1] - dims[0], dims[3] - dims[2]);
}
private int BitStringToInteger(String bits)
{
int converted = 0;
for (int i = 0; i < bits.Length; i++)
{
converted = (converted << 1) + (bits[i] == '1' ? 1 : 0);
}
return converted;
}
private String ByteArrayToBitString(byte[] byteArray)
{
byte[] newByteArray = new byte[byteArray.Length];
Array.Copy(byteArray, newByteArray, byteArray.Length);
String converted = "";
for (int i = 0; i < newByteArray.Length; i++)
{
for (int j = 0; j < 8; j++)
{
converted += (newByteArray[i] & 0x80) > 0 ? "1" : "0";
newByteArray[i] <<= 1;
}
}
return converted;
}
}
