[10737] | 1 | /*
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| 2 | * module: pip/jni/gdbm -- A Java interface to the GDBM library
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| 3 | * file: gdbmjava.c -- Native parts of the au.com.pharos.gdbm.GdbmFile
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| 4 | * Java class
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| 5 | *
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| 6 | * Copyright (C) 1997 Pharos IP Pty Ltd
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| 7 | *
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| 8 | * $Id: gdbmjava.c 10765 2005-10-25 02:52:00Z kjdon $
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| 9 | *
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| 10 | * This program is free software; you can redistribute it and/or modify
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| 11 | * it under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; either version 2 of the License, or
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| 13 | * (at your option) any later version.
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| 14 | *
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| 15 | * This program is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | * GNU General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU General Public License
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| 21 | * along with this program; if not, write to the Free Software
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| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | */
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| 24 |
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| 25 | /* NOTE ON MEMORY MANAGEMENT: GDBM always mallocs memory and expects
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| 26 | * the caller to free it. Java requires native functions to interact
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| 27 | * with it to lock and unlock buffers. */
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| 28 |
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| 29 | #include <errno.h>
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| 30 | #include <stdio.h>
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| 31 | #include <stdlib.h>
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| 32 | #include <string.h>
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| 33 |
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[10753] | 34 | #if defined (__WIN32__)
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| 35 | #include <gdbmdefs.h>
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| 36 | #include <gdbmerrno.h>
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| 37 | #define GDBM_FILE gdbm_file_info *
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| 38 | extern char* gdbm_version;
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| 39 | #else
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[10737] | 40 | #include <gdbm.h>
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[10753] | 41 | #endif
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[10737] | 42 |
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| 43 | #include <jni.h>
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| 44 |
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| 45 | #include <GdbmFile.h>
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| 46 |
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| 47 | #ifdef DEBUG
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| 48 | #define ASSERT(x) if (!(x)) { \
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| 49 | fprintf(stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
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| 50 | abort(); }
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| 51 | #else /* !DEBUG */
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| 52 | #define ASSERT(x)
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| 53 | #endif /* !DEBUG */
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| 54 |
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| 55 | /* The Java class within which the native methods are declared */
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| 56 | #define JAVA_CLASS "au.com.pharos.gdbm.GdbmFile"
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| 57 |
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| 58 | #define NULL_PTR_EXCEPTION(env) nullPtrException(env, __FILE__, __LINE__)
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| 59 | #define GDBM_EXCEPTION(env) gdbmException(env, __FILE__, __LINE__)
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| 60 |
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| 61 | #define CHECK_NOT_NULL(ptr, env) if (!ptr) { NULL_PTR_EXCEPTION(env); return 0; }
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| 62 | #define CHECK_NOT_NULL_VOID(ptr, env) if (!ptr) { NULL_PTR_EXCEPTION(env); return; }
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| 63 |
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| 64 | void gdbmException(JNIEnv *env, const char *file, int line);
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| 65 | void nullPtrException(JNIEnv *env, const char *file, int line);
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| 66 |
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| 67 | void releaseArray(JNIEnv *env, jbyteArray array, datum *fromDatum);
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| 68 | void releaseArrayAbort(JNIEnv *env, jbyteArray array, datum *fromDatum);
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| 69 | int arrayToDatum(JNIEnv *env, jbyteArray fromArray, datum *toDatum);
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| 70 | jbyteArray datumToArray(JNIEnv *env, datum *fromDatum);
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| 71 |
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| 72 | /* Convert between a jlong and a void ptr using a well-defined cast.
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| 73 | * (Casting between a pointer and an integer of different sizes spooks
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| 74 | * both gcc and mbp. */
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| 75 | #if (SIZEOF_VOID_P == SIZEOF_LONG)
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| 76 | # define DBF_TO_JLONG(x) ((jlong)((long) x))
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| 77 | # define JLONG_TO_DBF(x) ((GDBM_FILE)((long) x))
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| 78 | #elif (SIZEOF_VOID_P == SIZEOF_INT)
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| 79 | # define DBF_TO_JLONG(x) ((jlong)((int) (x)))
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| 80 | # define JLONG_TO_DBF(x) ((GDBM_FILE)((int) (x)))
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| 81 | #else
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| 82 | # define DBF_TO_JLONG(x) ((jlong)(x))
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| 83 | # define JLONG_TO_DBF(x) ((GDBM_FILE)(x))
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| 84 | #endif
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| 85 |
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| 86 |
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| 87 | JNIEXPORT jlong JNICALL
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| 88 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1open
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| 89 | (JNIEnv *env, jobject obj, jstring fileName, jint flags)
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| 90 | {
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| 91 | GDBM_FILE dbf;
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| 92 | const char *utfFileName;
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[10762] | 93 |
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[10737] | 94 | utfFileName = (*env)->GetStringUTFChars(env, fileName, 0);
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| 95 | if (!utfFileName)
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| 96 | return 0;
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| 97 |
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| 98 | setbuf(stderr, 0);
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[10762] | 99 |
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[10737] | 100 | /* XXX: Should we let the caller specify the file mode? I think
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| 101 | * not -- Java is above the level of octal file modes. [mbp] */
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[10765] | 102 | /* Couldn't get it to work properly on Windows without the 0 here -
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| 103 | wouldn't allow mulitple READs on a single file [kjdon] */
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| 104 | #if defined (__WIN32__)
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[10762] | 105 | dbf = gdbm_open((char *) utfFileName, 0, flags, 0660, NULL, 0);
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[10765] | 106 | #else
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| 107 | dbf = gdbm_open((char *) utfFileName, 0, flags, 0660, NULL);
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| 108 | #endif
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[10737] | 109 | if (utfFileName)
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| 110 | (*env)->ReleaseStringUTFChars(env, fileName, utfFileName);
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| 111 |
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| 112 | if (!dbf) {
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| 113 | GDBM_EXCEPTION(env);
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| 114 | return 0;
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| 115 | }
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[10762] | 116 |
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[10737] | 117 | return DBF_TO_JLONG(dbf);
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| 118 | }
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| 119 |
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| 120 |
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| 121 |
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| 122 |
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| 123 |
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| 124 | JNIEXPORT jbyteArray JNICALL
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| 125 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1firstkey
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| 126 | (JNIEnv *env, jobject obj, jlong dbf)
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| 127 | {
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| 128 | datum keyDatum;
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| 129 | jbyteArray keyArray;
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| 130 |
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| 131 | CHECK_NOT_NULL(dbf, env);
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| 132 |
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| 133 | keyDatum = gdbm_firstkey(JLONG_TO_DBF(dbf));
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| 134 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 135 | GDBM_EXCEPTION(env);
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| 136 | return 0;
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| 137 | }
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| 138 | if ( !keyDatum.dptr )
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| 139 | return 0;
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| 140 |
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| 141 | keyArray = datumToArray(env, &keyDatum);
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| 142 | free(keyDatum.dptr);
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| 143 |
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| 144 | return keyArray;
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| 145 | }
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| 146 |
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| 147 |
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| 148 |
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| 149 |
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| 150 |
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| 151 | JNIEXPORT jbyteArray JNICALL
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| 152 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1nextkey
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| 153 | (JNIEnv *env, jobject this, jlong dbf, jbyteArray keyArray)
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| 154 | {
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| 155 | datum keyDatum;
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| 156 | datum nextDatum;
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| 157 | jbyteArray nextArray;
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| 158 |
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| 159 | CHECK_NOT_NULL(dbf, env);
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| 160 |
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| 161 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 162 | NULL_PTR_EXCEPTION(env);
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| 163 | return 0;
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| 164 | }
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| 165 |
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| 166 | nextDatum = gdbm_nextkey(JLONG_TO_DBF(dbf), keyDatum);
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| 167 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 168 |
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| 169 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 170 | GDBM_EXCEPTION(env);
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| 171 | return 0;
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| 172 | }
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| 173 | if ( !nextDatum.dptr )
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| 174 | return 0;
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| 175 |
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| 176 | nextArray = datumToArray(env, &nextDatum);
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| 177 | free(nextDatum.dptr);
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| 178 |
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| 179 | return nextArray;
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| 180 | }
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| 181 |
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| 182 |
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| 183 |
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| 184 |
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| 185 |
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| 186 |
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| 187 | JNIEXPORT jbyteArray JNICALL
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| 188 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1fetch
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| 189 | (JNIEnv *env, jobject this, jlong dbf, jbyteArray keyArray)
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| 190 | {
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| 191 | datum keyDatum;
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| 192 | datum valueDatum;
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| 193 | jbyteArray valueArray;
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| 194 |
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| 195 | CHECK_NOT_NULL(dbf, env);
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| 196 |
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| 197 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 198 | NULL_PTR_EXCEPTION(env);
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| 199 | return 0;
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| 200 | }
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| 201 |
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| 202 | valueDatum = gdbm_fetch(JLONG_TO_DBF(dbf), keyDatum);
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| 203 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 204 |
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| 205 | if ( !valueDatum.dptr )
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| 206 | return 0;
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| 207 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 208 | GDBM_EXCEPTION(env);
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| 209 | return 0;
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| 210 | }
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| 211 |
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| 212 | valueArray = datumToArray(env, &valueDatum);
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| 213 | free(valueDatum.dptr);
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| 214 |
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| 215 | return valueArray;
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| 216 | }
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| 217 |
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| 218 |
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| 219 |
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| 220 | JNIEXPORT jboolean JNICALL
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| 221 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1exists
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| 222 | (JNIEnv *env, jobject obj, jlong dbf, jbyteArray keyArray)
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| 223 | {
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| 224 | datum keyDatum;
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| 225 | int result;
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| 226 |
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| 227 | CHECK_NOT_NULL(dbf, env);
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| 228 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 229 | NULL_PTR_EXCEPTION(env);
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| 230 | return JNI_FALSE;
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| 231 | }
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| 232 | result = gdbm_exists(JLONG_TO_DBF(dbf), keyDatum);
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| 233 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 234 | GDBM_EXCEPTION(env);
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| 235 | return 0;
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| 236 | }
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| 237 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 238 | return result ? JNI_TRUE : JNI_FALSE;
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| 239 | }
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| 240 |
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| 241 |
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| 242 |
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| 243 |
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| 244 |
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| 245 | JNIEXPORT void JNICALL
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| 246 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1store
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| 247 | (JNIEnv *env, jobject obj, jlong dbf,
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| 248 | jbyteArray keyArray, jbyteArray valueArray, jboolean replace)
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| 249 | {
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| 250 | datum keyDatum;
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| 251 | datum valueDatum;
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| 252 |
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| 253 | CHECK_NOT_NULL_VOID(dbf, env);
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| 254 |
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| 255 | if ( !arrayToDatum(env, keyArray, &keyDatum)
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| 256 | || !arrayToDatum(env, valueArray, &valueDatum) ) {
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| 257 | NULL_PTR_EXCEPTION(env);
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| 258 | return;
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| 259 | }
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| 260 |
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| 261 | gdbm_store(JLONG_TO_DBF(dbf), keyDatum, valueDatum,
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| 262 | replace ? GDBM_REPLACE : 0);
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| 263 |
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| 264 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 265 | releaseArrayAbort(env, valueArray, &valueDatum);
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| 266 |
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| 267 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 268 | GDBM_EXCEPTION(env);
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| 269 | }
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| 270 |
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| 271 |
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| 272 |
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| 273 | JNIEXPORT void JNICALL
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| 274 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1delete
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| 275 | (JNIEnv *env, jobject obj, jlong dbf, jbyteArray keyArray)
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| 276 | {
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| 277 | datum keyDatum;
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| 278 |
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| 279 | CHECK_NOT_NULL_VOID(dbf, env);
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| 280 |
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| 281 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 282 | NULL_PTR_EXCEPTION(env);
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| 283 | return;
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| 284 | }
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| 285 |
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| 286 | gdbm_delete(JLONG_TO_DBF(dbf), keyDatum);
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| 287 |
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| 288 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 289 |
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| 290 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 291 | GDBM_EXCEPTION(env);
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| 292 | }
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| 293 |
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| 294 |
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| 295 |
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| 296 | JNIEXPORT jstring JNICALL
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| 297 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1getversion
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| 298 | (JNIEnv *env, jclass cls)
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| 299 | {
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| 300 | return (*env)->NewStringUTF(env, gdbm_version);
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| 301 | }
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| 302 |
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| 303 |
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| 304 | JNIEXPORT jstring JNICALL
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| 305 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1wrapperVersion
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| 306 | (JNIEnv *env, jclass cls)
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| 307 | {
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[10753] | 308 | return (*env)->NewStringUTF(env, "JavaGDBM release 0005 built " __DATE__);
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[10737] | 309 | }
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| 310 |
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| 311 |
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| 312 |
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| 313 |
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| 314 | JNIEXPORT void JNICALL
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| 315 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1reorganize
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| 316 | (JNIEnv *env, jobject obj, jlong dbf)
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| 317 | {
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| 318 | CHECK_NOT_NULL_VOID(dbf, env);
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| 319 |
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| 320 | gdbm_reorganize(JLONG_TO_DBF(dbf));
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| 321 |
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| 322 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 323 | GDBM_EXCEPTION(env);
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| 324 | }
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| 325 |
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| 326 |
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| 327 |
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| 328 | JNIEXPORT void JNICALL
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| 329 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1close
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| 330 | (JNIEnv *env, jobject obj, jlong dbf)
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| 331 | {
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| 332 | CHECK_NOT_NULL_VOID(dbf, env);
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| 333 |
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| 334 | gdbm_close(JLONG_TO_DBF(dbf));
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| 335 |
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| 336 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 337 | GDBM_EXCEPTION(env);
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| 338 | }
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| 339 |
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| 340 |
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| 341 |
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| 342 | JNIEXPORT void JNICALL
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| 343 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1sync
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| 344 | (JNIEnv *env, jobject obj, jlong dbf)
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| 345 | {
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| 346 | CHECK_NOT_NULL_VOID(dbf, env);
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| 347 |
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| 348 | gdbm_sync(JLONG_TO_DBF(dbf));
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| 349 |
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| 350 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 351 | GDBM_EXCEPTION(env);
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| 352 | }
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| 353 |
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| 354 |
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| 355 |
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| 356 |
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| 357 | /**********************************************************************
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| 358 | *
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| 359 | * Following are support functions which aid in interfacing C to
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| 360 | * Java. */
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| 361 |
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| 362 | /** Create a new Java byte array from a GDBM datum, and return a
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| 363 | * pointer thereto. */
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| 364 |
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| 365 | jbyteArray datumToArray(JNIEnv *env, datum *fromDatum)
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| 366 | {
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| 367 | jbyteArray toArray;
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| 368 |
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| 369 | if (!fromDatum || !fromDatum->dptr)
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| 370 | return 0;
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| 371 |
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| 372 | toArray = (*env)->NewByteArray(env, fromDatum->dsize);
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| 373 | ASSERT(toArray);
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| 374 | (*env)->SetByteArrayRegion(env, toArray,
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| 375 | 0, fromDatum->dsize, fromDatum->dptr);
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| 376 |
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| 377 | return toArray;
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| 378 | }
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| 379 |
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| 380 | /** Convert a Java byte array to a GDBM datum.
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| 381 | *
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| 382 | * The Java array is pinned or copied for use in the datum, and must
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| 383 | * be released after use by releaseBytes.
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| 384 | *
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| 385 | * Returns true if the array is non-null and could be pinned. Otherwise,
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| 386 | * returns false.
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| 387 | */
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| 388 | int arrayToDatum(JNIEnv *env, jbyteArray fromArray, datum *toDatum)
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| 389 | {
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| 390 | if (fromArray) {
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| 391 | toDatum->dptr = (*env)->GetByteArrayElements(env, fromArray, 0);
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| 392 | toDatum->dsize = (*env)->GetArrayLength(env, fromArray);
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| 393 | return (int) toDatum->dptr;
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| 394 | }
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| 395 | else
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| 396 | return 0;
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| 397 | }
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| 398 |
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| 399 | /** Release a byte array pinned or copied for use in a datum. */
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| 400 | void releaseArray(JNIEnv *env, jbyteArray array, datum *fromDatum)
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| 401 | {
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| 402 | ASSERT(fromDatum->dptr);
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| 403 | (*env)->ReleaseByteArrayElements(env, array, fromDatum->dptr, 0);
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| 404 | fromDatum->dptr = 0; /* no longer valid */
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| 405 | }
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| 406 |
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| 407 | /** Release a byte array pinned or copied for use in a datum, aborting
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| 408 | * any changes. This potentially saves the runtime from having to
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| 409 | * copy back an unchanged array. */
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| 410 | void releaseArrayAbort(JNIEnv *env, jbyteArray array, datum *fromDatum)
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| 411 | {
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| 412 | ASSERT(fromDatum->dptr);
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| 413 | (*env)->ReleaseByteArrayElements(env, array, fromDatum->dptr,
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| 414 | JNI_ABORT);
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| 415 | fromDatum->dptr = 0; /* no longer valid */
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| 416 | }
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| 417 |
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| 418 |
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| 419 | /** Throw a null pointer exception. */
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| 420 | void nullPtrException(JNIEnv *env, const char *file, int line)
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| 421 | {
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| 422 | jclass exClass;
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| 423 | char reason[1024];
|
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| 424 | sprintf(reason, "Null pointer exception in GDBM wrapper (%s:%d)",
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| 425 | file, line);
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| 426 |
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| 427 | exClass = (*env)->FindClass(env, "java/lang/NullPointerException");
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| 428 | ASSERT(exClass);
|
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| 429 |
|
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| 430 | (*env)->ThrowNew(env, exClass, reason);
|
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| 431 | }
|
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| 432 |
|
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| 433 | /** Translate the GDBM error into throw a Java exception, and throw
|
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| 434 | * same.
|
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| 435 | *
|
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| 436 | * TODO: Throw different classes of exceptions depending on what the
|
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| 437 | * underlying error is.
|
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| 438 | */
|
---|
| 439 | void gdbmException(JNIEnv *env, const char *file, int line) {
|
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| 440 | jclass exClass;
|
---|
| 441 | static char reason[1500];
|
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| 442 | static char srcLocation[500];
|
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| 443 |
|
---|
| 444 | exClass = (*env)->FindClass(env, "au/com/pharos/gdbm/GdbmException");
|
---|
| 445 | ASSERT(exClass);
|
---|
| 446 |
|
---|
| 447 | strncpy(reason, gdbm_strerror(gdbm_errno), 500);
|
---|
| 448 | sprintf(srcLocation, " (%s:%d)", file, line);
|
---|
| 449 |
|
---|
| 450 | /* If the error code suggests that an OS or stdio error may have occurred,
|
---|
| 451 | * include supplementary information from errno. */
|
---|
| 452 | switch (gdbm_errno) {
|
---|
| 453 | case GDBM_FILE_OPEN_ERROR:
|
---|
| 454 | case GDBM_FILE_WRITE_ERROR:
|
---|
| 455 | case GDBM_FILE_SEEK_ERROR:
|
---|
| 456 | case GDBM_FILE_READ_ERROR:
|
---|
| 457 | case GDBM_MALLOC_ERROR:
|
---|
| 458 | case GDBM_REORGANIZE_FAILED:
|
---|
| 459 | strcat(reason, ": ");
|
---|
| 460 | strncat(reason, strerror(errno), 490);
|
---|
| 461 | strcat(reason, "?");
|
---|
| 462 | default:
|
---|
| 463 | /* errno is probably not useful */
|
---|
| 464 | ;
|
---|
| 465 | }
|
---|
| 466 |
|
---|
| 467 | strncat(reason, srcLocation, 495);
|
---|
| 468 | gdbm_errno = GDBM_NO_ERROR; /* this one has been handled */
|
---|
| 469 | (*env)->ThrowNew(env, exClass, reason);
|
---|
| 470 | }
|
---|
| 471 |
|
---|
| 472 | /*
|
---|
| 473 | * Local variables:
|
---|
| 474 | * c-basic-offset: 4
|
---|
| 475 | * End:
|
---|
| 476 | */
|
---|