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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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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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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44 | #include <gdbm.h>
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45 | #endif
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46 |
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47 | #include <jni.h>
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48 |
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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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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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113 |
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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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119 |
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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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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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125 | dbf = gdbm_open((char *) utfFileName, 0, flags, 0660, NULL, 0);
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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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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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136 |
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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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328 | return (*env)->NewStringUTF(env, "JavaGDBM release 0005 built " __DATE__);
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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. */
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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 */
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436 | }
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437 |
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438 |
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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];
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444 | sprintf(reason, "Null pointer exception in GDBM wrapper (%s:%d)",
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445 | file, line);
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446 |
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447 | exClass = (*env)->FindClass(env, "java/lang/NullPointerException");
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448 | ASSERT(exClass);
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449 |
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450 | (*env)->ThrowNew(env, exClass, reason);
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451 | }
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452 |
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453 | /** Translate the GDBM error into throw a Java exception, and throw
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454 | * same.
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455 | *
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456 | * TODO: Throw different classes of exceptions depending on what the
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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 | */
|
---|