/// <summary>
/// Convert the unicode string and actual image byte data to bytes
/// These bytes are then written to the file to create PDF image details
/// Output is formed by concatenating the first part of the object plus the actual byte data for the jpg
/// plus the closing tag of the object
/// </summary>
protected byte[] GetImageBytes(String startStr, String endStr, byte[] ImageByteStream, long filePos, out int size)
{
ObjectList objList = new ObjectList(objectNum, filePos);
byte[] s;
byte[] e;
try
{
//turn the start and end sections of image object to bytes
Encoding enc = Encoding.GetEncoding(1252);
s = Encoding.Unicode.GetBytes(startStr);
s = Encoding.Convert(Encoding.Unicode, enc, s);
e = Encoding.Unicode.GetBytes(endStr);
e = Encoding.Convert(Encoding.Unicode, enc, e);
XrefEntries.offsetArray.Add(objList);
//get the length of the byte stream to create a new byte for concatenation
size = s.Length + ImageByteStream.Length + e.Length;
}
catch (Exception ex)
{
string str1 = string.Format("{0},In PdfObjects.GetImageBytes()", objectNum);
Exception error = new Exception(ex.Message + str1);
throw error;
}
byte[] abuf = new byte[size];
try
{
int count = 0;
int i = 0;
//create the bytes for the image object up to and including the 'stream' command.
while (count < s.Length)
{
abuf[i] = s[count];
count++;
i++;
}
//add the bytes that represent the actual image data
count = 0;
while (count < ImageByteStream.Length)
{
abuf[i] = ImageByteStream[count];
count++;
i++;
}
//add the 'endstream' and 'endobj' commands
count = 0;
while (count < e.Length)
{
abuf[i] = e[count];
count++;
i++;
}
}
catch (Exception ex1)
{
string str2 = string.Format("{0},In PdfObjects.GetImageBytes()", objectNum);
Exception error = new Exception(ex1.Message + str2);
throw error;
}
return abuf;
}
/// <summary>
/// Convert the unicode string 16 bits to unicode bytes.
/// These bytes are then written to the file to create PDF details.
/// This is used for general parts of the pdf. Other similar pieces of code return other byte streams for images etc
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
protected byte[] GetUTF8Bytes(string str, long filePos, out int size)
{
ObjectList objList = new ObjectList(objectNum, filePos);
byte[] abuf;
try
{
byte[] ubuf = Encoding.Unicode.GetBytes(str);
Encoding enc = Encoding.GetEncoding(1252);
abuf = Encoding.Convert(Encoding.Unicode, enc, ubuf);
size = abuf.Length;
XrefEntries.offsetArray.Add(objList);
}
catch (Exception e)
{
string str1 = string.Format("{0},In PdfObjects.GetBytes()", objectNum);
Exception error = new Exception(e.Message + str1);
throw error;
}
return abuf;
}
/// <summary>
/// Creates the xref table using the byte offsets in the array.
/// </summary>
/// <param name="array"></param>
/// <param name="size"></param>
/// <returns></returns>
public byte[] CreateXrefTable(long fileOffset, out int size)
{
//Store the Offset of the Xref table for startxRef
try
{
ObjectList objList = new ObjectList(0, fileOffset);
XrefEntries.offsetArray.Add(objList);
XrefEntries.offsetArray.Sort();
numTableEntries = (uint)XrefEntries.offsetArray.Count;
table = string.Format("xref\r\n{0} {1}\r\n0000000000 65535 f\r\n", 0, numTableEntries);
for (int entries = 1; entries < numTableEntries; entries++)
{
ObjectList obj = (ObjectList)XrefEntries.offsetArray[entries];
table += obj.offset.ToString().PadLeft(10, '0');
table += " 00000 n\r\n";
}
}
catch (Exception e)
{
Exception error = new Exception(e.Message + " In Utility.CreateXrefTable()");
throw error;
}
return GetUTF8Bytes(table, out size);
}
