virtual public String DecodeSequence(CMapSequence seq)
{
StringBuilder sb = new StringBuilder();
int cid = 0;
while ((cid = DecodeSingle(seq)) >= 0)
{
sb.Append((char)cid);
}
return(sb.ToString());
}
/**
*
* @param seq
* @return the cid code or -1 for end
*/
virtual public int DecodeSingle(CMapSequence seq)
{
int end = seq.off + seq.len;
int currentPlane = 0;
while (seq.off < end)
{
int one = seq.seq[seq.off++] & 0xff;
--seq.len;
char[] plane = planes[currentPlane];
int cid = plane[one];
if ((cid & 0x8000) == 0)
{
return(cid);
}
else
{
currentPlane = cid & 0x7fff;
}
}
return(-1);
}
/**
* 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
*/
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();
}
/**
*
* @param seq
* @return the cid code or -1 for end
*/
virtual public int DecodeSingle(CMapSequence seq) {
int end = seq.off + seq.len;
int currentPlane = 0;
while (seq.off < end) {
int one = seq.seq[seq.off++] & 0xff;
--seq.len;
char[] plane = planes[currentPlane];
int cid = plane[one];
if ((cid & 0x8000) == 0) {
return cid;
}
else
currentPlane = cid & 0x7fff;
}
return -1;
}
virtual public String DecodeSequence(CMapSequence seq) {
StringBuilder sb = new StringBuilder();
int cid = 0;
while ((cid = DecodeSingle(seq)) >= 0) {
sb.Append((char)cid);
}
return sb.ToString();
}
/**
* ! .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;
}
