/**
* ! .NET SPECIFIC; this method is used to avoid unecessary using of StringBuilder because it is slow in .NET !
* Decodes a single character string of bytes (encoded in the font's encoding) into a unicode string
* This will use the ToUnicode map of the font, if available, otherwise it uses
* the font's encoding
* @param cidbytes the bytes that need to be decoded
* @return the unicode String that results from decoding
*/
virtual public String DecodeSingleCharacter(byte[] cidbytes, int offset, int len)
{
string s = "";
if (toUnicodeCmap == null && byteCid != null)
{
CMapSequence seq = new CMapSequence(cidbytes, offset, len);
int ca = byteCid.DecodeSingle(seq);
if (ca >= 0)
{
int c = cidUni.Lookup(ca);
if (c > 0)
{
s = Utilities.ConvertFromUtf32(c);
}
}
}
else
{
String rslt = DecodeSingleCID(cidbytes, offset, 1);
if (rslt == null && len > 1)
{
rslt = DecodeSingleCID(cidbytes, offset, 2);
}
if (rslt != null)
{
s = rslt;
}
}
return(s);
}
/**
* Decodes a string of bytes (encoded in the font's encoding) into a unicode string
* This will use the ToUnicode map of the font, if available, otherwise it uses
* the font's encoding
* @param cidbytes the bytes that need to be decoded
* @return the unicode String that results from decoding
* @since 2.1.7
*/
virtual public String Decode(byte[] cidbytes, int offset, int len)
{
StringBuilder sb = new StringBuilder();
if (toUnicodeCmap == null && byteCid != null)
{
CMapSequence seq = new CMapSequence(cidbytes, offset, len);
String cid = byteCid.DecodeSequence(seq);
foreach (char ca in cid)
{
int c = cidUni.Lookup(ca);
if (c > 0)
{
sb.Append(Utilities.ConvertFromUtf32(c));
}
}
}
else
{
for (int i = offset; i < offset + len; i++)
{
String rslt = DecodeSingleCID(cidbytes, i, 1);
if (rslt == null && i < offset + len - 1)
{
rslt = DecodeSingleCID(cidbytes, i, 2);
i++;
}
if (rslt != null)
{
sb.Append(rslt);
}
}
}
return(sb.ToString());
}
