java实现c 解释器_chartobytedefault.c 源代码在线查看 - kaffe Java 解释器语言,源码,Java的子集系统,开放源代码 资源下载 虫虫电子下载站...

/* * kaffe.io.CharToByteDefault * * This class goes native because its main task is to copy chars to bytes * (i.e. System.arraycopy - incompatible arrays). It should * avoid buffer-to-buffer copying * * Copyright (c) 1998 *Transvirtual Technologies, Inc. All rights reserved. * * See the file "license.terms" for information on usage and redistribution * of this file. */#include "kaffe_io_CharToByteDefault.h"jintJava_kaffe_io_CharToByteDefault_convert( JNIEnv* env, jobject _this, jcharArray fromChars, jint fromPos, jint fromLen, jbyteArray toBytes, jint toPos, jint toLen ){ register jint i, j; jboolean isCopy; jbyte *jb = (*env)->GetByteArrayElements( env, toBytes, &isCopy); int blen = (*env)->GetArrayLength( env, toBytes); jchar *jc = (*env)->GetCharArrayElements( env, fromChars, &isCopy); int clen = (*env)->GetArrayLength( env, fromChars); int n = fromPos + fromLen; int m = toPos + toLen; if ( n > clen ) n = clen - fromPos; /* be paranoid, we are native */ if ( m > blen ) m = blen - toPos; for ( i=fromPos, j=toPos; (ijb[j] = jc[i]; /* * in case we have something left we cannot convert (because of missing * 'to' buffer space), we have to store it here (via a method call to save * the field access costs). This is very inefficient and should be avoided by * setting the right parameter values in Java */ if ( i < n ) {jclass clazz = (*env)->GetObjectClass( env, _this);jmethodID mId = (*env)->GetMethodID( env, clazz, "carry", "([CII)V");(*env)->CallVoidMethod( env, _this, mId, fromChars, i, (n-i)); } (*env)->ReleaseByteArrayElements( env, toBytes, jb, JNI_ABORT); (*env)->ReleaseCharArrayElements( env, fromChars, jc, 0); return (j - toPos);}