1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include "jni.h" 27 #include "jni_util.h" 28 #include "jvm.h" 29 #include "jlong.h" 30 31 #include <dlfcn.h> 32 #include <string.h> 33 34 #define MAGIC_MIME_TYPE 0x000010 /* Return the MIME type */ 35 36 typedef struct magic_set magic_t; 37 38 typedef magic_t* (*magic_open_func)(int flags); 39 typedef int (*magic_load_func)(magic_t* cookie, const char* filename); 40 typedef const char* (*magic_file_func)(magic_t* cookie, const char* filename); 41 typedef void (*magic_close_func)(magic_t* cookie); 42 43 static void* magic_handle; 44 static magic_open_func magic_open; 45 static magic_load_func magic_load; 46 static magic_file_func magic_file; 47 static magic_close_func magic_close; 48 49 #include "sun_nio_fs_MagicFileTypeDetector.h" 50 51 JNIEXPORT jboolean JNICALL 52 Java_sun_nio_fs_MagicFileTypeDetector_initialize0 53 (JNIEnv* env, jclass this) 54 { 55 magic_handle = dlopen("libmagic.so", RTLD_LAZY); 56 if (magic_handle == NULL) { 57 magic_handle = dlopen("libmagic.so.1", RTLD_LAZY); 58 if (magic_handle == NULL) { 59 return JNI_FALSE; 60 } 61 } 62 63 magic_open = (magic_open_func)dlsym(magic_handle, "magic_open"); 64 65 magic_load = (magic_load_func)dlsym(magic_handle, "magic_load"); 66 67 magic_file = (magic_file_func)dlsym(magic_handle, "magic_file"); 68 69 magic_close = (magic_close_func)dlsym(magic_handle, "magic_close"); 70 71 if (magic_open == NULL || 72 magic_load == NULL || 73 magic_file == NULL || 74 magic_close == NULL) 75 { 76 dlclose(magic_handle); 77 return JNI_FALSE; 78 } 79 80 return JNI_TRUE; 81 } 82 83 JNIEXPORT jbyteArray JNICALL 84 Java_sun_nio_fs_MagicFileTypeDetector_probe0 85 (JNIEnv* env, jclass this, jlong pathAddress) 86 { 87 char* path = (char*)jlong_to_ptr(pathAddress); 88 magic_t* cookie; 89 jbyteArray result = NULL; 90 91 cookie = (*magic_open)(MAGIC_MIME_TYPE); 92 93 if (cookie != NULL) { 94 if ((*magic_load)(cookie, NULL) != -1) { 95 const char* type = (*magic_file)(cookie, path); 96 if (type != NULL) { 97 jsize len = strlen(type); 98 result = (*env)->NewByteArray(env, len); 99 if (result != NULL) { 100 (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)type); 101 } 102 } 103 } 104 (*magic_close)(cookie); 105 } 106 107 return result; 108 }