[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 26674 2013-01-10 03:30:25Z davidb $
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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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[26674] | 34 | #ifdef __MINGW32__
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| 35 | #define MSDOS
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| 36 | #endif
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| 37 |
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| 38 | #if defined (_MSC_VER)
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[10753] | 39 | #include <gdbmdefs.h>
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| 40 | #include <gdbmerrno.h>
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| 41 | #define GDBM_FILE gdbm_file_info *
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| 42 | extern char* gdbm_version;
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| 43 | #else
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[10737] | 44 | #include <gdbm.h>
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[10753] | 45 | #endif
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[10737] | 46 |
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| 47 | #include <jni.h>
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| 48 |
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[26674] | 49 | #ifdef __MINGW32__
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| 50 |
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| 51 | /* (Cross) compiling for Windows Want the type definitions in *win32*
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| 52 | version of jni_md.h but with the mingw c compiler this then leads
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| 53 | to C-mangled style functions (param/num args encoded in function
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| 54 | name) which we *don't* want. The following achieves this */
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| 55 |
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| 56 | #undef JNIEXPORT
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| 57 | #undef JNIIMPORT
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| 58 | #undef JNICALL
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| 59 |
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| 60 | #define JNIEXPORT
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| 61 | #define JNIIMPORT
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| 62 | #define JNICALL
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| 63 | #endif
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| 64 |
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[10737] | 65 | #include <GdbmFile.h>
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| 66 |
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| 67 | #ifdef DEBUG
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| 68 | #define ASSERT(x) if (!(x)) { \
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| 69 | fprintf(stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
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| 70 | abort(); }
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| 71 | #else /* !DEBUG */
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| 72 | #define ASSERT(x)
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| 73 | #endif /* !DEBUG */
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| 74 |
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| 75 | /* The Java class within which the native methods are declared */
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| 76 | #define JAVA_CLASS "au.com.pharos.gdbm.GdbmFile"
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| 77 |
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| 78 | #define NULL_PTR_EXCEPTION(env) nullPtrException(env, __FILE__, __LINE__)
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| 79 | #define GDBM_EXCEPTION(env) gdbmException(env, __FILE__, __LINE__)
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| 80 |
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| 81 | #define CHECK_NOT_NULL(ptr, env) if (!ptr) { NULL_PTR_EXCEPTION(env); return 0; }
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| 82 | #define CHECK_NOT_NULL_VOID(ptr, env) if (!ptr) { NULL_PTR_EXCEPTION(env); return; }
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| 83 |
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| 84 | void gdbmException(JNIEnv *env, const char *file, int line);
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| 85 | void nullPtrException(JNIEnv *env, const char *file, int line);
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| 86 |
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| 87 | void releaseArray(JNIEnv *env, jbyteArray array, datum *fromDatum);
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| 88 | void releaseArrayAbort(JNIEnv *env, jbyteArray array, datum *fromDatum);
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| 89 | int arrayToDatum(JNIEnv *env, jbyteArray fromArray, datum *toDatum);
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| 90 | jbyteArray datumToArray(JNIEnv *env, datum *fromDatum);
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| 91 |
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| 92 | /* Convert between a jlong and a void ptr using a well-defined cast.
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| 93 | * (Casting between a pointer and an integer of different sizes spooks
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| 94 | * both gcc and mbp. */
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| 95 | #if (SIZEOF_VOID_P == SIZEOF_LONG)
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| 96 | # define DBF_TO_JLONG(x) ((jlong)((long) x))
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| 97 | # define JLONG_TO_DBF(x) ((GDBM_FILE)((long) x))
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| 98 | #elif (SIZEOF_VOID_P == SIZEOF_INT)
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| 99 | # define DBF_TO_JLONG(x) ((jlong)((int) (x)))
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| 100 | # define JLONG_TO_DBF(x) ((GDBM_FILE)((int) (x)))
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| 101 | #else
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| 102 | # define DBF_TO_JLONG(x) ((jlong)(x))
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| 103 | # define JLONG_TO_DBF(x) ((GDBM_FILE)(x))
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| 104 | #endif
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| 105 |
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| 106 |
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| 107 | JNIEXPORT jlong JNICALL
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| 108 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1open
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| 109 | (JNIEnv *env, jobject obj, jstring fileName, jint flags)
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| 110 | {
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| 111 | GDBM_FILE dbf;
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| 112 | const char *utfFileName;
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[10762] | 113 |
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[10737] | 114 | utfFileName = (*env)->GetStringUTFChars(env, fileName, 0);
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| 115 | if (!utfFileName)
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| 116 | return 0;
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| 117 |
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| 118 | setbuf(stderr, 0);
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[10762] | 119 |
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[10737] | 120 | /* XXX: Should we let the caller specify the file mode? I think
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| 121 | * not -- Java is above the level of octal file modes. [mbp] */
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[10765] | 122 | /* Couldn't get it to work properly on Windows without the 0 here -
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| 123 | wouldn't allow mulitple READs on a single file [kjdon] */
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| 124 | #if defined (__WIN32__)
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[10762] | 125 | dbf = gdbm_open((char *) utfFileName, 0, flags, 0660, NULL, 0);
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[10765] | 126 | #else
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| 127 | dbf = gdbm_open((char *) utfFileName, 0, flags, 0660, NULL);
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| 128 | #endif
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[10737] | 129 | if (utfFileName)
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| 130 | (*env)->ReleaseStringUTFChars(env, fileName, utfFileName);
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| 131 |
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| 132 | if (!dbf) {
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| 133 | GDBM_EXCEPTION(env);
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| 134 | return 0;
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| 135 | }
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[10762] | 136 |
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[10737] | 137 | return DBF_TO_JLONG(dbf);
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| 138 | }
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| 139 |
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| 140 |
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| 141 |
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| 142 |
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| 143 |
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| 144 | JNIEXPORT jbyteArray JNICALL
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| 145 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1firstkey
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| 146 | (JNIEnv *env, jobject obj, jlong dbf)
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| 147 | {
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| 148 | datum keyDatum;
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| 149 | jbyteArray keyArray;
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| 150 |
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| 151 | CHECK_NOT_NULL(dbf, env);
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| 152 |
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| 153 | keyDatum = gdbm_firstkey(JLONG_TO_DBF(dbf));
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| 154 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 155 | GDBM_EXCEPTION(env);
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| 156 | return 0;
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| 157 | }
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| 158 | if ( !keyDatum.dptr )
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| 159 | return 0;
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| 160 |
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| 161 | keyArray = datumToArray(env, &keyDatum);
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| 162 | free(keyDatum.dptr);
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| 163 |
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| 164 | return keyArray;
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| 165 | }
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| 166 |
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| 167 |
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| 168 |
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| 169 |
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| 170 |
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| 171 | JNIEXPORT jbyteArray JNICALL
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| 172 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1nextkey
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| 173 | (JNIEnv *env, jobject this, jlong dbf, jbyteArray keyArray)
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| 174 | {
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| 175 | datum keyDatum;
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| 176 | datum nextDatum;
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| 177 | jbyteArray nextArray;
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| 178 |
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| 179 | CHECK_NOT_NULL(dbf, env);
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| 180 |
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| 181 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 182 | NULL_PTR_EXCEPTION(env);
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| 183 | return 0;
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| 184 | }
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| 185 |
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| 186 | nextDatum = gdbm_nextkey(JLONG_TO_DBF(dbf), keyDatum);
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| 187 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 188 |
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| 189 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 190 | GDBM_EXCEPTION(env);
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| 191 | return 0;
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| 192 | }
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| 193 | if ( !nextDatum.dptr )
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| 194 | return 0;
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| 195 |
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| 196 | nextArray = datumToArray(env, &nextDatum);
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| 197 | free(nextDatum.dptr);
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| 198 |
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| 199 | return nextArray;
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| 200 | }
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| 201 |
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| 202 |
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| 203 |
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| 204 |
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| 205 |
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| 206 |
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| 207 | JNIEXPORT jbyteArray JNICALL
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| 208 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1fetch
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| 209 | (JNIEnv *env, jobject this, jlong dbf, jbyteArray keyArray)
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| 210 | {
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| 211 | datum keyDatum;
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| 212 | datum valueDatum;
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| 213 | jbyteArray valueArray;
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| 214 |
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| 215 | CHECK_NOT_NULL(dbf, env);
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| 216 |
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| 217 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 218 | NULL_PTR_EXCEPTION(env);
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| 219 | return 0;
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| 220 | }
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| 221 |
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| 222 | valueDatum = gdbm_fetch(JLONG_TO_DBF(dbf), keyDatum);
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| 223 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 224 |
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| 225 | if ( !valueDatum.dptr )
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| 226 | return 0;
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| 227 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 228 | GDBM_EXCEPTION(env);
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| 229 | return 0;
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| 230 | }
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| 231 |
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| 232 | valueArray = datumToArray(env, &valueDatum);
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| 233 | free(valueDatum.dptr);
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| 234 |
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| 235 | return valueArray;
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| 236 | }
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| 237 |
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| 238 |
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| 239 |
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| 240 | JNIEXPORT jboolean JNICALL
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| 241 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1exists
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| 242 | (JNIEnv *env, jobject obj, jlong dbf, jbyteArray keyArray)
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| 243 | {
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| 244 | datum keyDatum;
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| 245 | int result;
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| 246 |
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| 247 | CHECK_NOT_NULL(dbf, env);
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| 248 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 249 | NULL_PTR_EXCEPTION(env);
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| 250 | return JNI_FALSE;
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| 251 | }
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| 252 | result = gdbm_exists(JLONG_TO_DBF(dbf), keyDatum);
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| 253 | if ( gdbm_errno != GDBM_NO_ERROR ) {
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| 254 | GDBM_EXCEPTION(env);
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| 255 | return 0;
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| 256 | }
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| 257 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 258 | return result ? JNI_TRUE : JNI_FALSE;
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| 259 | }
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| 260 |
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| 261 |
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| 262 |
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| 263 |
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| 264 |
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| 265 | JNIEXPORT void JNICALL
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| 266 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1store
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| 267 | (JNIEnv *env, jobject obj, jlong dbf,
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| 268 | jbyteArray keyArray, jbyteArray valueArray, jboolean replace)
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| 269 | {
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| 270 | datum keyDatum;
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| 271 | datum valueDatum;
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| 272 |
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| 273 | CHECK_NOT_NULL_VOID(dbf, env);
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| 274 |
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| 275 | if ( !arrayToDatum(env, keyArray, &keyDatum)
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| 276 | || !arrayToDatum(env, valueArray, &valueDatum) ) {
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| 277 | NULL_PTR_EXCEPTION(env);
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| 278 | return;
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| 279 | }
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| 280 |
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| 281 | gdbm_store(JLONG_TO_DBF(dbf), keyDatum, valueDatum,
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| 282 | replace ? GDBM_REPLACE : 0);
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| 283 |
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| 284 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 285 | releaseArrayAbort(env, valueArray, &valueDatum);
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| 286 |
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| 287 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 288 | GDBM_EXCEPTION(env);
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| 289 | }
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| 290 |
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| 291 |
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| 292 |
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| 293 | JNIEXPORT void JNICALL
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| 294 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1delete
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| 295 | (JNIEnv *env, jobject obj, jlong dbf, jbyteArray keyArray)
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| 296 | {
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| 297 | datum keyDatum;
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| 298 |
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| 299 | CHECK_NOT_NULL_VOID(dbf, env);
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| 300 |
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| 301 | if (!arrayToDatum(env, keyArray, &keyDatum)) {
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| 302 | NULL_PTR_EXCEPTION(env);
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| 303 | return;
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| 304 | }
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| 305 |
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| 306 | gdbm_delete(JLONG_TO_DBF(dbf), keyDatum);
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| 307 |
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| 308 | releaseArrayAbort(env, keyArray, &keyDatum);
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| 309 |
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| 310 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 311 | GDBM_EXCEPTION(env);
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| 312 | }
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| 313 |
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| 314 |
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| 315 |
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| 316 | JNIEXPORT jstring JNICALL
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| 317 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1getversion
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| 318 | (JNIEnv *env, jclass cls)
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| 319 | {
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| 320 | return (*env)->NewStringUTF(env, gdbm_version);
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| 321 | }
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| 322 |
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| 323 |
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| 324 | JNIEXPORT jstring JNICALL
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| 325 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1wrapperVersion
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| 326 | (JNIEnv *env, jclass cls)
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| 327 | {
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[10753] | 328 | return (*env)->NewStringUTF(env, "JavaGDBM release 0005 built " __DATE__);
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[10737] | 329 | }
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| 330 |
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| 331 |
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| 332 |
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| 333 |
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| 334 | JNIEXPORT void JNICALL
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| 335 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1reorganize
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| 336 | (JNIEnv *env, jobject obj, jlong dbf)
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| 337 | {
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| 338 | CHECK_NOT_NULL_VOID(dbf, env);
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| 339 |
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| 340 | gdbm_reorganize(JLONG_TO_DBF(dbf));
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| 341 |
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| 342 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 343 | GDBM_EXCEPTION(env);
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| 344 | }
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| 345 |
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| 346 |
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| 347 |
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| 348 | JNIEXPORT void JNICALL
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| 349 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1close
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| 350 | (JNIEnv *env, jobject obj, jlong dbf)
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| 351 | {
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| 352 | CHECK_NOT_NULL_VOID(dbf, env);
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| 353 |
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| 354 | gdbm_close(JLONG_TO_DBF(dbf));
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| 355 |
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| 356 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 357 | GDBM_EXCEPTION(env);
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| 358 | }
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| 359 |
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| 360 |
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| 361 |
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| 362 | JNIEXPORT void JNICALL
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| 363 | Java_au_com_pharos_gdbm_GdbmFile_gdbm_1sync
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| 364 | (JNIEnv *env, jobject obj, jlong dbf)
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| 365 | {
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| 366 | CHECK_NOT_NULL_VOID(dbf, env);
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| 367 |
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| 368 | gdbm_sync(JLONG_TO_DBF(dbf));
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| 369 |
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| 370 | if ( gdbm_errno != GDBM_NO_ERROR )
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| 371 | GDBM_EXCEPTION(env);
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| 372 | }
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| 373 |
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| 374 |
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| 375 |
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| 376 |
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| 377 | /**********************************************************************
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| 378 | *
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| 379 | * Following are support functions which aid in interfacing C to
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| 380 | * Java. */
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| 381 |
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| 382 | /** Create a new Java byte array from a GDBM datum, and return a
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| 383 | * pointer thereto. */
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| 384 |
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| 385 | jbyteArray datumToArray(JNIEnv *env, datum *fromDatum)
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| 386 | {
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| 387 | jbyteArray toArray;
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| 388 |
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| 389 | if (!fromDatum || !fromDatum->dptr)
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| 390 | return 0;
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| 391 |
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| 392 | toArray = (*env)->NewByteArray(env, fromDatum->dsize);
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| 393 | ASSERT(toArray);
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| 394 | (*env)->SetByteArrayRegion(env, toArray,
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| 395 | 0, fromDatum->dsize, fromDatum->dptr);
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| 396 |
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| 397 | return toArray;
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| 398 | }
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| 399 |
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| 400 | /** Convert a Java byte array to a GDBM datum.
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| 401 | *
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| 402 | * The Java array is pinned or copied for use in the datum, and must
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| 403 | * be released after use by releaseBytes.
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| 404 | *
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| 405 | * Returns true if the array is non-null and could be pinned. Otherwise,
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| 406 | * returns false.
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| 407 | */
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| 408 | int arrayToDatum(JNIEnv *env, jbyteArray fromArray, datum *toDatum)
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| 409 | {
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| 410 | if (fromArray) {
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| 411 | toDatum->dptr = (*env)->GetByteArrayElements(env, fromArray, 0);
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| 412 | toDatum->dsize = (*env)->GetArrayLength(env, fromArray);
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| 413 | return (int) toDatum->dptr;
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| 414 | }
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| 415 | else
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| 416 | return 0;
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| 417 | }
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| 418 |
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| 419 | /** Release a byte array pinned or copied for use in a datum. */
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| 420 | void releaseArray(JNIEnv *env, jbyteArray array, datum *fromDatum)
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| 421 | {
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| 422 | ASSERT(fromDatum->dptr);
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| 423 | (*env)->ReleaseByteArrayElements(env, array, fromDatum->dptr, 0);
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| 424 | fromDatum->dptr = 0; /* no longer valid */
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| 425 | }
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| 426 |
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| 427 | /** Release a byte array pinned or copied for use in a datum, aborting
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| 428 | * any changes. This potentially saves the runtime from having to
|
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| 429 | * copy back an unchanged array. */
|
---|
| 430 | void releaseArrayAbort(JNIEnv *env, jbyteArray array, datum *fromDatum)
|
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| 431 | {
|
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| 432 | ASSERT(fromDatum->dptr);
|
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| 433 | (*env)->ReleaseByteArrayElements(env, array, fromDatum->dptr,
|
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| 434 | JNI_ABORT);
|
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| 435 | fromDatum->dptr = 0; /* no longer valid */
|
---|
| 436 | }
|
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| 437 |
|
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| 438 |
|
---|
| 439 | /** Throw a null pointer exception. */
|
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| 440 | void nullPtrException(JNIEnv *env, const char *file, int line)
|
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| 441 | {
|
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| 442 | jclass exClass;
|
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| 443 | char reason[1024];
|
---|
| 444 | sprintf(reason, "Null pointer exception in GDBM wrapper (%s:%d)",
|
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| 445 | file, line);
|
---|
| 446 |
|
---|
| 447 | exClass = (*env)->FindClass(env, "java/lang/NullPointerException");
|
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| 448 | ASSERT(exClass);
|
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| 449 |
|
---|
| 450 | (*env)->ThrowNew(env, exClass, reason);
|
---|
| 451 | }
|
---|
| 452 |
|
---|
| 453 | /** Translate the GDBM error into throw a Java exception, and throw
|
---|
| 454 | * same.
|
---|
| 455 | *
|
---|
| 456 | * TODO: Throw different classes of exceptions depending on what the
|
---|
| 457 | * underlying error is.
|
---|
| 458 | */
|
---|
| 459 | void gdbmException(JNIEnv *env, const char *file, int line) {
|
---|
| 460 | jclass exClass;
|
---|
| 461 | static char reason[1500];
|
---|
| 462 | static char srcLocation[500];
|
---|
| 463 |
|
---|
| 464 | exClass = (*env)->FindClass(env, "au/com/pharos/gdbm/GdbmException");
|
---|
| 465 | ASSERT(exClass);
|
---|
| 466 |
|
---|
| 467 | strncpy(reason, gdbm_strerror(gdbm_errno), 500);
|
---|
| 468 | sprintf(srcLocation, " (%s:%d)", file, line);
|
---|
| 469 |
|
---|
| 470 | /* If the error code suggests that an OS or stdio error may have occurred,
|
---|
| 471 | * include supplementary information from errno. */
|
---|
| 472 | switch (gdbm_errno) {
|
---|
| 473 | case GDBM_FILE_OPEN_ERROR:
|
---|
| 474 | case GDBM_FILE_WRITE_ERROR:
|
---|
| 475 | case GDBM_FILE_SEEK_ERROR:
|
---|
| 476 | case GDBM_FILE_READ_ERROR:
|
---|
| 477 | case GDBM_MALLOC_ERROR:
|
---|
| 478 | case GDBM_REORGANIZE_FAILED:
|
---|
| 479 | strcat(reason, ": ");
|
---|
| 480 | strncat(reason, strerror(errno), 490);
|
---|
| 481 | strcat(reason, "?");
|
---|
| 482 | default:
|
---|
| 483 | /* errno is probably not useful */
|
---|
| 484 | ;
|
---|
| 485 | }
|
---|
| 486 |
|
---|
| 487 | strncat(reason, srcLocation, 495);
|
---|
| 488 | gdbm_errno = GDBM_NO_ERROR; /* this one has been handled */
|
---|
| 489 | (*env)->ThrowNew(env, exClass, reason);
|
---|
| 490 | }
|
---|
| 491 |
|
---|
| 492 | /*
|
---|
| 493 | * Local variables:
|
---|
| 494 | * c-basic-offset: 4
|
---|
| 495 | * End:
|
---|
| 496 | */
|
---|