private void ProcessParameters()
{
type = Element.JPEG;
originalType = ORIGINAL_JPEG;
Stream istr = null;
try {
string errorID;
if (rawData == null){
WebRequest w = WebRequest.Create(url);
w.Credentials = CredentialCache.DefaultCredentials;
istr = w.GetResponse().GetResponseStream();
errorID = url.ToString();
}
else{
istr = new MemoryStream(rawData);
errorID = "Byte array";
}
if (istr.ReadByte() != 0xFF || istr.ReadByte() != 0xD8) {
throw new BadElementException(MessageLocalization.GetComposedMessage("1.is.not.a.valid.jpeg.file", errorID));
}
bool firstPass = true;
int len;
while (true) {
int v = istr.ReadByte();
if (v < 0)
throw new IOException(MessageLocalization.GetComposedMessage("premature.eof.while.reading.jpg"));
if (v == 0xFF) {
int marker = istr.ReadByte();
if (firstPass && marker == M_APP0) {
firstPass = false;
len = GetShort(istr);
if (len < 16) {
Utilities.Skip(istr, len - 2);
continue;
}
byte[] bcomp = new byte[JFIF_ID.Length];
int r = istr.Read(bcomp, 0, bcomp.Length);
if (r != bcomp.Length)
throw new BadElementException(MessageLocalization.GetComposedMessage("1.corrupted.jfif.marker", errorID));
bool found = true;
for (int k = 0; k < bcomp.Length; ++k) {
if (bcomp[k] != JFIF_ID[k]) {
found = false;
break;
}
}
if (!found) {
Utilities.Skip(istr, len - 2 - bcomp.Length);
continue;
}
Utilities.Skip(istr, 2);
int units = istr.ReadByte();
int dx = GetShort(istr);
int dy = GetShort(istr);
if (units == 1) {
dpiX = dx;
dpiY = dy;
}
else if (units == 2) {
dpiX = (int)((float)dx * 2.54f + 0.5f);
dpiY = (int)((float)dy * 2.54f + 0.5f);
}
Utilities.Skip(istr, len - 2 - bcomp.Length - 7);
continue;
}
if (marker == M_APPE) {
len = GetShort(istr) - 2;
byte[] byteappe = new byte[len];
for (int k = 0; k < len; ++k) {
byteappe[k] = (byte)istr.ReadByte();
}
if (byteappe.Length >= 12) {
string appe = System.Text.ASCIIEncoding.ASCII.GetString(byteappe,0,5);
if (Util.EqualsIgnoreCase(appe, "adobe")) {
invert = true;
}
}
continue;
}
if (marker == M_APP2) {
len = GetShort(istr) - 2;
byte[] byteapp2 = new byte[len];
for (int k = 0; k < len; ++k) {
byteapp2[k] = (byte)istr.ReadByte();
}
if (byteapp2.Length >= 14) {
String app2 = System.Text.ASCIIEncoding.ASCII.GetString(byteapp2, 0, 11);
if (app2.Equals("ICC_PROFILE")) {
int order = byteapp2[12] & 0xff;
int count = byteapp2[13] & 0xff;
// some jpeg producers don't know how to count to 1
if (order < 1)
order = 1;
if (count < 1)
count = 1;
if (icc == null)
icc = new byte[count][];
icc[order - 1] = byteapp2;
}
}
continue;
}
if (marker == M_APPD) {
len = GetShort(istr) - 2;
byte[] byteappd = new byte[len];
for (int k = 0; k < len; k++) {
byteappd[k] = (byte)istr.ReadByte();
}
// search for '8BIM Resolution' marker
int j = 0;
for (j = 0; j < len-PS_8BIM_RESO.Length; j++) {
bool found = true;
for (int i = 0; i < PS_8BIM_RESO.Length; i++) {
if (byteappd[j+i] != PS_8BIM_RESO[i]) {
found = false;
break;
}
}
if (found)
break;
}
j+=PS_8BIM_RESO.Length;
if (j < len-PS_8BIM_RESO.Length) {
// "PASCAL String" for name, i.e. string prefix with length byte
// padded to be even length; 2 null bytes if empty
byte namelength = byteappd[j];
// add length byte
namelength++;
// add padding
if (namelength % 2 == 1)
namelength++;
// just skip name
j += namelength;
// size of the resolution data
int resosize = (byteappd[j] << 24) + (byteappd[j+1] << 16) + (byteappd[j+2] << 8) + byteappd[j+3];
// should be 16
if (resosize != 16) {
// fail silently, for now
//System.err.println("DEBUG: unsupported resolution IRB size");
continue;
}
j+=4;
int dx = (byteappd[j] << 8) + (byteappd[j+1] & 0xff);
j+=2;
// skip 2 unknown bytes
j+=2;
int unitsx = (byteappd[j] << 8) + (byteappd[j + 1] & 0xff);
j+=2;
// skip 2 unknown bytes
j+=2;
int dy = (byteappd[j] << 8) + (byteappd[j + 1] & 0xff);
j+=2;
// skip 2 unknown bytes
j+=2;
int unitsy = (byteappd[j] << 8) + (byteappd[j + 1] & 0xff);
if (unitsx == 1 || unitsx == 2) {
dx = (unitsx == 2 ? (int)(dx * 2.54f + 0.5f) : dx);
// make sure this is consistent with JFIF data
if (dpiX != 0 && dpiX != dx) {
//System.err.println("DEBUG: inconsistent metadata (dpiX: " + dpiX + " vs " + dx + ")");
}
else
dpiX = dx;
}
if (unitsy == 1 || unitsy == 2) {
dy = (unitsy == 2 ? (int)(dy * 2.54f + 0.5f) : dy);
// make sure this is consistent with JFIF data
if (dpiY != 0 && dpiY != dy) {
//System.err.println("DEBUG: inconsistent metadata (dpiY: " + dpiY + " vs " + dy + ")");
}
else
dpiY = dy;
}
}
continue;
}
firstPass = false;
int markertype = MarkerType(marker);
if (markertype == VALID_MARKER) {
Utilities.Skip(istr, 2);
if (istr.ReadByte() != 0x08) {
throw new BadElementException(MessageLocalization.GetComposedMessage("1.must.have.8.bits.per.component", errorID));
}
scaledHeight = GetShort(istr);
Top = scaledHeight;
scaledWidth = GetShort(istr);
Right = scaledWidth;
colorspace = istr.ReadByte();
bpc = 8;
break;
}
else if (markertype == UNSUPPORTED_MARKER) {
throw new BadElementException(MessageLocalization.GetComposedMessage("1.unsupported.jpeg.marker.2", errorID, marker));
}
else if (markertype != NOPARAM_MARKER) {
Utilities.Skip(istr, GetShort(istr) - 2);
}
}
}
}
finally {
if (istr != null) {
istr.Close();
}
}
plainWidth = this.Width;
plainHeight = this.Height;
if (icc != null) {
int total = 0;
for (int k = 0; k < icc.Length; ++k) {
if (icc[k] == null) {
icc = null;
return;
}
total += icc[k].Length - 14;
}
byte[] ficc = new byte[total];
total = 0;
for (int k = 0; k < icc.Length; ++k) {
System.Array.Copy(icc[k], 14, ficc, total, icc[k].Length - 14);
total += icc[k].Length - 14;
}
try {
ICC_Profile icc_prof = ICC_Profile.GetInstance(ficc, colorspace);
TagICC = icc_prof;
}
catch {}
icc = null;
}
}
