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package org.netbeans.modules.cnd.debugger.gdb.utils;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
/**
*
* @author gordonp
*/
public class GdbEncoder extends CharsetEncoder {
public GdbEncoder(Charset cs, CharsetEncoder encoder) {
super(cs, encoder.averageBytesPerChar(), encoder.maxBytesPerChar());
}
public CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
char[] sa = src.array();
int sp = src.arrayOffset() + src.position();
int sl = src.arrayOffset() + src.limit();
assert (sp <= sl);
sp = (sp <= sl ? sp : sl);
byte[] da = dst.array();
int dp = dst.arrayOffset() + dst.position();
int dl = dst.arrayOffset() + dst.limit();
assert (dp <= dl);
dp = (dp <= dl ? dp : dl);
try {
while (sp < sl) {
char c = sa[sp];
if (c < 0x80) {
// Have at most seven bits
if (dp >= dl) {
return CoderResult.OVERFLOW;
}
da[dp++] = (byte) c;
sp++;
continue;
}
// 2 bytes, 11 bits
if (c < 0x800) {
if (dl - dp < 8) {
return CoderResult.OVERFLOW;
}
String b1 = Integer.toOctalString(0xc0 | ((c >> 06)));
da[dp++] = '\\';
da[dp++] = (byte) (b1.charAt(0) & 0x7f);
da[dp++] = (byte) (b1.charAt(1) & 0x7f);
da[dp++] = (byte) (b1.charAt(2) & 0x7f);
String b2 = Integer.toOctalString(0x80 | ((c >> 00) & 0x3f));
da[dp++] = '\\';
da[dp++] = (byte) (b2.charAt(0) & 0x7f);
da[dp++] = (byte) (b2.charAt(1) & 0x7f);
da[dp++] = (byte) (b2.charAt(2) & 0x7f);
sp++;
continue;
}
if (c <= '\uFFFF') {
// 3 bytes, 16 bits
if (dl - dp < 3) {
return CoderResult.OVERFLOW;
}
da[dp++] = (byte) (0xe0 | ((c >> 12)));
da[dp++] = (byte) (0x80 | ((c >> 06) & 0x3f));
da[dp++] = (byte) (0x80 | ((c >> 00) & 0x3f));
sp++;
continue;
}
}
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
}
}
}
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