use magic bytes, i copied this from the java src code somewhere and i added
a few others:
public static String getContentType(byte[] imageData)
{
byte[] header = new byte[11];
System.arraycopy(imageData, 0, header, 0, Math.min(imageData.length,
header.length));
int c1 = (int)header[0] & 0xff;
int c2 = (int)header[1] & 0xff;
int c3 = (int)header[2] & 0xff;
int c4 = (int)header[3] & 0xff;
int c5 = (int)header[4] & 0xff;
int c6 = (int)header[5] & 0xff;
int c7 = (int)header[6] & 0xff;
int c8 = (int)header[7] & 0xff;
int c9 = (int)header[8] & 0xff;
int c10 = (int)header[9] & 0xff;
int c11 = (int)header[10] & 0xff;
if (c1 == 0xCA && c2 == 0xFE && c3 == 0xBA && c4 == 0xBE) { return
"application/java-vm"; }
if (c1 == 0xD0 && c2 == 0xCF && c3 == 0x11 && c4 == 0xE0 && c5 ==
0xA1 && c6 == 0xB1 && c7 == 0x1A && c8 == 0xE1)
{
return "application/msword";
}
if (c1 == 0x25 && c2 == 0x50 && c3 == 0x44 && c4 == 0x46 && c5 ==
0x2d && c6 == 0x31 && c7 == 0x2e)
{
return "application/pdf";
}
if (c1 == 0x38 && c2 == 0x42 && c3 == 0x50 && c4 == 0x53 && c5 ==
0x00 && c6 == 0x01)
{
return "image/photoshop";
}
if (c1 == 0x25 && c2 == 0x21 && c3 == 0x50 && c4 == 0x53)
{
return "application/postscript";
}
if (c1 == 0xff && c2 == 0xfb && c3 == 0x30)
{
return "audio/mp3";
}
if (c1 == 0x49 && c2 == 0x44 && c3 == 0x33)
{
return "audio/mp3";
}
if (c1 == 0xAC && c2 == 0xED)
{
// next two bytes are version number, currently 0x00 0x05
return "application/x-java-serialized-object";
}
if (c1 == '<')
{
if (c2 == '!'
|| ((c2 == 'h' && (c3 == 't' && c4 == 'm' && c5 == 'l'
|| c3 == 'e' && c4 == 'a' && c5 == 'd') || (c2 == 'b'
&& c3 == 'o' && c4 == 'd' && c5 == 'y')))
|| ((c2 == 'H' && (c3 == 'T' && c4 == 'M' && c5 == 'L'
|| c3 == 'E' && c4 == 'A' && c5 == 'D') || (c2 == 'B'
&& c3 == 'O' && c4 == 'D' && c5 == 'Y')))) {
return "text/html"; }
if (c2 == '?' && c3 == 'x' && c4 == 'm' && c5 == 'l' && c6 == '
') { return "application/xml"; }
}
// big and little endian UTF-16 encodings, with byte order mark
if (c1 == 0xfe && c2 == 0xff)
{
if (c3 == 0 && c4 == '<' && c5 == 0 && c6 == '?' && c7 == 0 &&
c8 == 'x') { return "application/xml"; }
}
if (c1 == 0xff && c2 == 0xfe)
{
if (c3 == '<' && c4 == 0 && c5 == '?' && c6 == 0 && c7 == 'x' &&
c8 == 0) { return "application/xml"; }
}
if (c1 == 'B' && c2 == 'M') { return "image/bmp"; }
if (c1 == 0x49 && c2 == 0x49 && c3 == 0x2a && c4 == 0x00) { return
"image/tiff"; }
if (c1 == 0x4D && c2 == 0x4D && c3 == 0x00 && c4 == 0x2a) { return
"image/tiff"; }
if (c1 == 'G' && c2 == 'I' && c3 == 'F' && c4 == '8') { return
"image/gif"; }
if (c1 == '#' && c2 == 'd' && c3 == 'e' && c4 == 'f') { return
"image/x-bitmap"; }
if (c1 == '!' && c2 == ' ' && c3 == 'X' && c4 == 'P' && c5 == 'M' &&
c6 == '2') { return "image/x-pixmap"; }
if (c1 == 137 && c2 == 80 && c3 == 78 && c4 == 71 && c5 == 13 && c6
== 10 && c7 == 26 && c8 == 10) { return "image/png"; }
if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF)
{
if (c4 == 0xE0) { return "image/jpeg"; }
/**
* File format used by digital cameras to store images. Exif
Format can
* be read by any application supporting JPEG. Exif Spec can be
found
* at: http://www.pima.net/standards/it10/PIMA15740/Exif_2-1.PDF
*/
if ((c4 == 0xE1) && (c7 == 'E' && c8 == 'x' && c9 == 'i' && c10
== 'f' && c11 == 0)) { return "image/jpeg"; }
if (c4 == 0xEE) { return "image/jpg"; }
}
if (c1 == 0x41 && c2 == 0x43)
{
return "application/acad";
}
if (c1 == 0x2E && c2 == 0x73 && c3 == 0x6E && c4 == 0x64) { return
"audio/basic"; // .au
// format,
// big
// endian
}
if (c1 == 0x64 && c2 == 0x6E && c3 == 0x73 && c4 == 0x2E) { return
"audio/basic"; // .au
// format,
// little
// endian
}
if (c1 == 'R' && c2 == 'I' && c3 == 'F' && c4 == 'F')
{
/*
* I don't know if this is official but evidence suggests that
.wav
* files start with "RIFF" - brown
*/
return "audio/x-wav";
}
return null;
}
On 5/18/07, Lec <[EMAIL PROTECTED]> wrote:
How do I do that? Any pointer?
igor.vaynberg wrote:
>
> you want to check the received bytes as the file is being uploaded?
>
> -igor
>
>
> On 5/18/07, Lec <[EMAIL PROTECTED]> wrote:
>>
>>
>> How to check the binary contents of the uploaded file. For example, to
>> prevent the fake file being uploaded, because I really want to check if
>> the
>> uploaded file is really the pdf file or image file. How can you do it?
I
>> realise checking the mime type of the file is not enough as the file
>> extension can still be renamed. HOw can i do it?
>> --
>> View this message in context:
>>
http://www.nabble.com/Check-the-mime-type-of-uploaded-file-and-its-binary-content-tf3776119.html#a10677590
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
>>
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>
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View this message in context:
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Sent from the Wicket - User mailing list archive at Nabble.com.
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