org_argeo_api_uuid_NativeUuidFactory.c

   1 #include <jni.h>
   2 #include <uuid.h>
   3 #include "org_argeo_api_uuid_NativeUuidFactory.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 /*
  50  * Class:     org_argeo_api_uuid_NativeUuidFactory
  51  * Method:    timeUUID
  52  * Signature: ()Ljava/util/UUID;
  53  */
  54 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_NativeUuidFactory_timeUUID(
  55                 JNIEnv *env, jobject) {
  56         uuid_t out;
  57
  58         uuid_generate_time(out);
  59         return fromBytes(env, out);
  60 }
  61
  62 /*
  63  * Class:     org_argeo_api_uuid_NativeUuidFactory
  64  * Method:    nameUUIDv5
  65  * Signature: (Ljava/util/UUID;[B)Ljava/util/UUID;
  66  */
  67 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_NativeUuidFactory_nameUUIDv5(
  68                 JNIEnv *env, jobject, jobject namespaceUuid, jbyteArray name) {
  69         uuid_t ns;
  70         uuid_t out;
  71
  72         toBytes(env, namespaceUuid, ns);
  73         jsize length = (*env)->GetArrayLength(env, name);
  74         jbyte *bytes = (*env)->GetByteArrayElements(env, name, 0);
  75
  76         uuid_generate_sha1(out, ns, bytes, length);
  77         return fromBytes(env, out);
  78 }
  79
  80 /*
  81  * Class:     org_argeo_api_uuid_NativeUuidFactory
  82  * Method:    nameUUIDv3
  83  * Signature: (Ljava/util/UUID;[B)Ljava/util/UUID;
  84  */
  85 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_NativeUuidFactory_nameUUIDv3(
  86                 JNIEnv *env, jobject, jobject namespaceUuid, jbyteArray name) {
  87         uuid_t ns;
  88         uuid_t out;
  89
  90         toBytes(env, namespaceUuid, ns);
  91         jsize length = (*env)->GetArrayLength(env, name);
  92         jbyte *bytes = (*env)->GetByteArrayElements(env, name, 0);
  93
  94         uuid_generate_md5(out, ns, bytes, length);
  95         return fromBytes(env, out);
  96 }
  97
  98 /*
  99  * Class:     org_argeo_api_uuid_NativeUuidFactory
 100  * Method:    randomUUIDStrong
 101  * Signature: ()Ljava/util/UUID;
 102  */
 103 JNIEXPORT jobject JNICALL Java_org_argeo_api_uuid_NativeUuidFactory_randomUUIDStrong(
 104                 JNIEnv *env, jobject) {
 105         uuid_t out;
 106
 107         uuid_generate_random(out);
 108         return fromBytes(env, out);
 109 }