jni/org_argeo_api_uuid_libuuid/org_argeo_api_uuid_libuuid_LibuuidFactory.c

   1 #include <jni.h>
   2 #include <uuid.h>
   3 #include "org_argeo_api_uuid_libuuid_LibuuidFactory.h"
   4
   5 /*
   6  * UTILITIES
   7  */
   8
   9 static inline jobject fromBytes(JNIEnv *env, uuid_t out) {
  10         jlong msb = 0;
  11         jlong lsb = 0;
  12
  13         for (int i = 0; i < 8; i++)
  14                 msb = (msb << 8) | (out[i] & 0xff);
  15         for (int i = 8; i < 16; i++)
  16                 lsb = (lsb << 8) | (out[i] & 0xff);
  17
  18         jclass uuidClass = (*env)->FindClass(env, "java/util/UUID");
  19         jmethodID uuidConstructor = (*env)->GetMethodID(env, uuidClass, "<init>",
  20                         "(JJ)V");
  21
  22         jobject jUUID = (*env)->AllocObject(env, uuidClass);
  23         (*env)->CallVoidMethod(env, jUUID, uuidConstructor, msb, lsb);
  24
  25         return jUUID;
  26 }
  27
  28 static inline void toBytes(JNIEnv *env, jobject jUUID, uuid_t result) {
  29
  30         jclass uuidClass = (*env)->FindClass(env, "java/util/UUID");
  31         jmethodID getMostSignificantBits = (*env)->GetMethodID(env, uuidClass,
  32                         "getMostSignificantBits", "()J");
  33         jmethodID getLeastSignificantBits = (*env)->GetMethodID(env, uuidClass,
  34                         "getLeastSignificantBits", "()J");
  35
  36         jlong msb = (*env)->CallLongMethod(env, jUUID, getMostSignificantBits);
  37         jlong lsb = (*env)->CallLongMethod(env, jUUID, getLeastSignificantBits);
  38
  39         for (int i = 0; i < 8; i++)
  40                 result[i] = (unsigned char) ((msb >> ((7 - i) * 8)) & 0xff);
  41         for (int i = 8; i < 16; i++)
  42                 result[i] = (unsigned char) ((lsb >> ((15 - i) * 8)) & 0xff);
  43 }
  44
  45 /*
  46  * JNI IMPLEMENTATION
  47  */
  48
  49 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_libuuid_LibuuidFactory_timeUUID(
  50                 JNIEnv *env, jobject uuidFactory) {
  51         uuid_t out;
  52
  53         uuid_generate_time(out);
  54         return fromBytes(env, out);
  55 }
  56
  57 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_libuuid_LibuuidFactory_nameUUIDv5(
  58                 JNIEnv *env, jobject uuidFactory, jobject namespaceUuid,
  59                 jbyteArray name) {
  60         uuid_t ns;
  61         uuid_t out;
  62
  63         toBytes(env, namespaceUuid, ns);
  64         jsize length = (*env)->GetArrayLength(env, name);
  65         jbyte *bytes = (*env)->GetByteArrayElements(env, name, 0);
  66
  67         uuid_generate_sha1(out, ns, bytes, length);
  68         return fromBytes(env, out);
  69 }
  70
  71 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_libuuid_LibuuidFactory_nameUUIDv3(
  72                 JNIEnv *env, jobject uuidFactory, jobject namespaceUuid,
  73                 jbyteArray name) {
  74         uuid_t ns;
  75         uuid_t out;
  76
  77         toBytes(env, namespaceUuid, ns);
  78         jsize length = (*env)->GetArrayLength(env, name);
  79         jbyte *bytes = (*env)->GetByteArrayElements(env, name, 0);
  80
  81         uuid_generate_md5(out, ns, bytes, length);
  82         return fromBytes(env, out);
  83 }
  84
  85 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_libuuid_LibuuidFactory_randomUUIDStrong(
  86                 JNIEnv *env, jobject uuidFactory) {
  87         uuid_t out;
  88
  89         uuid_generate_random(out);
  90         return fromBytes(env, out);
  91 }