Create JpegExifRemovePatcher.cs

pull/1/head
unknown 4 years ago
parent b4f29e8d6f
commit 838c860440

@ -0,0 +1,58 @@
using System.IO;
namespace ZeroLevel.Services.Drawing
{
public class JpegExifRemovePatcher
{
public void Patch(string source, string target)
{
using (var from_stream = File.Open(source, FileMode.Open))
{
using (var to_stream = File.Create(target))
{
PatchAwayExif(from_stream, to_stream);
}
}
}
public Stream PatchAwayExif(Stream inStream, Stream outStream)
{
byte[] jpegHeader = new byte[2];
jpegHeader[0] = (byte)inStream.ReadByte();
jpegHeader[1] = (byte)inStream.ReadByte();
if (jpegHeader[0] == 0xff && jpegHeader[1] == 0xd8) //check if it's a jpeg file
{
SkipAppHeaderSection(inStream);
}
outStream.WriteByte(0xff);
outStream.WriteByte(0xd8);
int readCount;
byte[] readBuffer = new byte[8192];
while ((readCount = inStream.Read(readBuffer, 0, readBuffer.Length)) > 0)
outStream.Write(readBuffer, 0, readCount);
return outStream;
}
private void SkipAppHeaderSection(Stream inStream)
{
byte[] header = new byte[2];
header[0] = (byte)inStream.ReadByte();
header[1] = (byte)inStream.ReadByte();
while (header[0] == 0xff && (header[1] >= 0xe0 && header[1] <= 0xef))
{
int exifLength = inStream.ReadByte();
exifLength = exifLength << 8;
exifLength |= inStream.ReadByte();
for (int i = 0; i < exifLength - 2; i++)
{
inStream.ReadByte();
}
header[0] = (byte)inStream.ReadByte();
header[1] = (byte)inStream.ReadByte();
}
inStream.Position -= 2; //skip back two bytes
}
}
}
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