remove nativeDoubleValue(), update jbigi README

core/c/jbigi/README

@@ -9,9 +9,19 @@ TODO: Document generated folder structure
 TODO: Instructions for adding the libraries to a jar
 
 Linux-specific information:
+===========================
 Some linux distributions comes bundled with GMP.
-There is currently no out-of-the-box support for this in the current build-scripts.
+Try 'locate lib/libgmp.so' to see.
+If so, install the the libgmp3-dev debian package to get the libgmp headers.
+Then export I2P=/path/to/your/i2p/install.
+Then do 'build.sh dynamic'. This will do a quick build using your installed libgmp library
+and then test it and the jbigi in your I2P installation to see which is faster.
+
+If the new jbigi is slower, then run 'build.sh' (without the 'dynamic'), which will download
+the 4.3.1 libgmp library, build, and test that.
+
 
 Windows-specific information:
+=============================
 The best way of building the jbigi dll's is to install Mingw {URL} and msys {URL}.
 The combination of these two should be able to run the included build-scripts without modifications.

core/c/jbigi/jbigi/src/jbigi.c

@@ -57,33 +57,6 @@ JNIEXPORT jbyteArray JNICALL Java_net_i2p_util_NativeBigInteger_nativeModPow
         return jresult;
 }
 
-/******** nativeDoubleValue() */
-/*
- * Class:     net_i2p_util_NativeBigInteger
- * Method:    nativeDoubleValue
- * Signature: ([B)D
- *
- * From the Javadoc:
- *
- * Converts a BigInteger byte-array to a 'double'
- * @param ba Big endian twos complement representation of the BigInteger to convert to a double
- * @return The plain double-value represented by 'ba'
- */
-JNIEXPORT jdouble JNICALL Java_net_i2p_util_NativeBigInteger_nativeDoubleValue
-(JNIEnv * env, jclass cls, jbyteArray jba){
-	    /* 1) Convert the bytearray BigInteger value into the format libgmp understands
-         * 2) Call libgmp's mpz_get_d.
-         * 3) Convert libgmp's result into a big endian twos complement number.
-         */
-        mpz_t mval;
-		jdouble retval;
-        convert_j2mp(env, jba, &mval);
-
-		retval = mpz_get_d(mval);
-		mpz_clear(mval);
-		return retval;
-}
-
 /******************************
  *****Conversion methods*******
  ******************************/