First Commit from Source Code Reply

gnpdev/SecurityUtility/sorgenti_c/it_valueteam_securityutility_KeyJNIBridge.c

@@ -0,0 +1,87 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <stdio.h>
+#include <jni.h>
+#include "it_valueteam_securityutility_KeyJNIBridge.h"
+
+#define SHMSZ     27
+//#define KEY     5678
+#define KEY     5650
+#define PERM     0600
+
+JNIEXPORT jbyteArray JNICALL Java_it_valueteam_securityutility_KeyJNIBridge_readKey
+  (JNIEnv * env, jobject obj, jint indirizzo){
+
+    int shmid;
+    int i = 0;
+    key_t key;
+    char *shm, *s;
+    jbyteArray result;
+    char buffer[24] = "12345123451234512345123";
+	 
+    //key = KEY;
+    key = (key_t)indirizzo;
+    
+    result = (*env)->NewByteArray(env,24);
+    if(result==NULL) {
+    	printf("Allocazione fallita.\n");
+    }
+
+    if ((shmid = shmget(key, SHMSZ, PERM)) < 0) {
+        perror("shmget");
+        return NULL;
+    }
+
+    if ((shm = shmat(shmid, NULL, 0)) == (char *) -1) {
+        perror("shmat");
+        return NULL;
+    }
+    
+    for(s = shm; i<24; s++) {
+    	buffer[i++] = *s;
+    }
+    
+    (*env)->SetByteArrayRegion(env,result,0,24,buffer);
+    return result;
+}
+
+JNIEXPORT void JNICALL Java_it_valueteam_securityutility_KeyJNIBridge_writeKey
+  (JNIEnv * env, jobject obj, jint indirizzo, jbyteArray chiave) {
+  	
+    int shmid;
+    key_t key;
+    char * shm, *s;
+    int i;
+    jbyte *start;
+    
+    //key = KEY;
+    key = (key_t)indirizzo;
+    
+    printf("Inizio scrittura.\n");
+
+    /*
+     * Create the segment.
+     */
+    if ((shmid = shmget(key, SHMSZ, IPC_CREAT | PERM)) < 0) {
+      perror("shmget");
+      exit(1);
+    }
+
+    /*
+     * Now we attach the segment to our data space.
+     */
+    if ((shm = shmat(shmid, NULL, 0)) == (char * ) - 1) {
+      perror("shmat");
+      exit(1);
+    }
+    
+    start = (*env)->GetByteArrayElements(env,chiave,NULL);
+    s = shm;
+    for(i=0;i<24;i++) {
+    	* s++ = start[i];
+    }
+    (*env)->ReleaseByteArrayElements(env, chiave, start, 0);
+    
+}
+