1 /*
2 * Copyright (c) 2003, 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 #include <sys/types.h>
26
27 #include <stdio.h>
28 #include <string.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31
32
33 #include <limits.h>
34
35 #include <com_sun_java_util_jar_pack_NativeUnpack.h>
36
37 #include "jni_util.h"
38
39 #include "defines.h"
40 #include "bytes.h"
41 #include "utils.h"
42 #include "coding.h"
43 #include "bands.h"
44 #include "constants.h"
45 #include "zip.h"
46 #include "unpack.h"
47
48
49 static jfieldID unpackerPtrFID;
50 static jmethodID currentInstMID;
51 static jmethodID readInputMID;
52 static jclass NIclazz;
53 static jmethodID getUnpackerPtrMID;
54
55 static char* dbg = null;
56
57 #define THROW_IOE(x) JNU_ThrowIOException(env,x)
58
59 static jlong read_input_via_jni(unpacker* self,
60 void* buf, jlong minlen, jlong maxlen);
61
62 static unpacker* get_unpacker(JNIEnv *env, jobject pObj, bool noCreate=false) {
63 unpacker* uPtr;
64 jlong p = env->CallLongMethod(pObj, getUnpackerPtrMID);
65 uPtr = (unpacker*)jlong2ptr(p);
66 if (uPtr == null) {
67 if (noCreate) return null;
68 uPtr = new unpacker();
69 if (uPtr == null) {
70 THROW_IOE(ERROR_ENOMEM);
71 return null;
72 }
73 //fprintf(stderr, "get_unpacker(%p) uPtr=%p initializing\n", pObj, uPtr);
74 uPtr->init(read_input_via_jni);
75 uPtr->jniobj = (void*) env->NewGlobalRef(pObj);
76 env->SetLongField(pObj, unpackerPtrFID, ptr2jlong(uPtr));
77 }
78 uPtr->jnienv = env; // keep refreshing this in case of MT access
79 return uPtr;
80 }
81
82 // This is the harder trick: Pull the current state out of mid-air.
83 static unpacker* get_unpacker() {
84 //fprintf(stderr, "get_unpacker()\n");
85 JavaVM* vm = null;
86 jsize nVM = 0;
87 jint retval = JNI_GetCreatedJavaVMs(&vm, 1, &nVM);
88 // other VM implements may differ, thus for correctness, we need these checks
89 if (retval != JNI_OK || nVM != 1)
90 return null;
91 void* envRaw = null;
92 vm->GetEnv(&envRaw, JNI_VERSION_1_1);
93 JNIEnv* env = (JNIEnv*) envRaw;
94 //fprintf(stderr, "get_unpacker() env=%p\n", env);
95 if (env == null)
96 return null;
97 jobject pObj = env->CallStaticObjectMethod(NIclazz, currentInstMID);
98 //fprintf(stderr, "get_unpacker0() pObj=%p\n", pObj);
99 if (pObj != null) {
100 // Got pObj and env; now do it the easy way.
101 return get_unpacker(env, pObj);
102 }
103 // this should really not happen, if it does something is seriously
104 // wrong throw an exception
105 THROW_IOE(ERROR_INTERNAL);
106 return null;
107 }
108
109 static void free_unpacker(JNIEnv *env, jobject pObj, unpacker* uPtr) {
110 if (uPtr != null) {
111 //fprintf(stderr, "free_unpacker(%p) uPtr=%p\n", pObj, uPtr);
112 env->DeleteGlobalRef((jobject) uPtr->jniobj);
113 uPtr->jniobj = null;
114 uPtr->free();
115 delete uPtr;
116 env->SetLongField(pObj, unpackerPtrFID, (jlong)null);
117 }
118 }
119
120 unpacker* unpacker::current() {
121 return get_unpacker();
122 }
123
124 // Callback for fetching data, Java style. Calls NativeUnpack.readInputFn().
125 static jlong read_input_via_jni(unpacker* self,
126 void* buf, jlong minlen, jlong maxlen) {
127 JNIEnv* env = (JNIEnv*) self->jnienv;
128 jobject pbuf = env->NewDirectByteBuffer(buf, maxlen);
129 return env->CallLongMethod((jobject) self->jniobj, readInputMID,
130 pbuf, minlen);
131 }
132
133 JNIEXPORT void JNICALL
134 Java_com_sun_java_util_jar_pack_NativeUnpack_initIDs(JNIEnv *env, jclass clazz) {
135 #ifndef PRODUCT
136 dbg = getenv("DEBUG_ATTACH");
137 while( dbg != null) { sleep(10); }
138 #endif
139 NIclazz = (jclass) env->NewGlobalRef(clazz);
140 unpackerPtrFID = env->GetFieldID(clazz, "unpackerPtr", "J");
141 currentInstMID = env->GetStaticMethodID(clazz, "currentInstance",
142 "()Ljava/lang/Object;");
143 readInputMID = env->GetMethodID(clazz, "readInputFn",
144 "(Ljava/nio/ByteBuffer;J)J");
145 getUnpackerPtrMID = env->GetMethodID(clazz, "getUnpackerPtr", "()J");
146
147 if (unpackerPtrFID == null ||
148 currentInstMID == null ||
149 readInputMID == null ||
150 NIclazz == null ||
151 getUnpackerPtrMID == null) {
152 THROW_IOE("cannot init class members");
153 }
154 }
155
156 JNIEXPORT jlong JNICALL
157 Java_com_sun_java_util_jar_pack_NativeUnpack_start(JNIEnv *env, jobject pObj,
158 jobject pBuf, jlong offset) {
159 // try to get the unpacker pointer the hard way first, we do this to ensure
160 // valid object pointers and env is intact, if not now is good time to bail.
161 unpacker* uPtr = get_unpacker();
162 //fprintf(stderr, "start(%p) uPtr=%p initializing\n", pObj, uPtr);
163 if (uPtr == null) {
164 return -1;
165 }
166 // redirect our io to the default log file or whatever.
167 uPtr->redirect_stdio();
168
169 void* buf = null;
170 size_t buflen = 0;
171 if (pBuf != null) {
172 buf = env->GetDirectBufferAddress(pBuf);
173 buflen = (size_t)env->GetDirectBufferCapacity(pBuf);
174 if (buflen == 0) buf = null;
175 if (buf == null) { THROW_IOE(ERROR_INTERNAL); return 0; }
176 if ((size_t)offset >= buflen)
177 { buf = null; buflen = 0; }
178 else
179 { buf = (char*)buf + (size_t)offset; buflen -= (size_t)offset; }
180 }
181 // before we start off we make sure there is no other error by the time we
182 // get here
183 if (uPtr->aborting()) {
184 THROW_IOE(uPtr->get_abort_message());
185 return 0;
186 }
187 uPtr->start(buf, buflen);
188 if (uPtr->aborting()) {
189 THROW_IOE(uPtr->get_abort_message());
190 return 0;
191 }
192
193 return ((jlong)
194 uPtr->get_segments_remaining() << 32)
195 + uPtr->get_files_remaining();
196 }
197
198 JNIEXPORT jboolean JNICALL
199 Java_com_sun_java_util_jar_pack_NativeUnpack_getNextFile(JNIEnv *env, jobject pObj,
200 jobjectArray pParts) {
201
202 unpacker* uPtr = get_unpacker(env, pObj);
203 unpacker::file* filep = uPtr->get_next_file();
204
205 if (uPtr->aborting()) {
206 THROW_IOE(uPtr->get_abort_message());
207 return false;
208 }
209
210 if (filep == null) {
211 return false; // end of the sequence
212 }
213 assert(filep == &uPtr->cur_file);
214
215 int pidx = 0, iidx = 0;
216 jintArray pIntParts = (jintArray) env->GetObjectArrayElement(pParts, pidx++);
217 jint* intParts = env->GetIntArrayElements(pIntParts, null);
218 intParts[iidx++] = (jint)( (julong)filep->size >> 32 );
219 intParts[iidx++] = (jint)( (julong)filep->size >> 0 );
220 intParts[iidx++] = filep->modtime;
221 intParts[iidx++] = filep->deflate_hint() ? 1 : 0;
222 env->ReleaseIntArrayElements(pIntParts, intParts, JNI_COMMIT);
223
224 env->SetObjectArrayElement(pParts, pidx++, env->NewStringUTF(filep->name));
225
226 jobject pDataBuf = null;
227 if (filep->data[0].len > 0)
228 pDataBuf = env->NewDirectByteBuffer(filep->data[0].ptr,
229 filep->data[0].len);
230 env->SetObjectArrayElement(pParts, pidx++, pDataBuf);
231 pDataBuf = null;
232 if (filep->data[1].len > 0)
233 pDataBuf = env->NewDirectByteBuffer(filep->data[1].ptr,
234 filep->data[1].len);
235 env->SetObjectArrayElement(pParts, pidx++, pDataBuf);
236
237 return true;
238 }
239
240
241 JNIEXPORT jobject JNICALL
242 Java_com_sun_java_util_jar_pack_NativeUnpack_getUnusedInput(JNIEnv *env, jobject pObj) {
243 unpacker* uPtr = get_unpacker(env, pObj);
244 unpacker::file* filep = &uPtr->cur_file;
245
246 if (uPtr->aborting()) {
247 THROW_IOE(uPtr->get_abort_message());
248 return false;
249 }
250
251 // We have fetched all the files.
252 // Now swallow up any remaining input.
253 if (uPtr->input_remaining() == 0) {
254 return null;
255 } else {
256 bytes remaining_bytes;
257 remaining_bytes.malloc(uPtr->input_remaining());
258 remaining_bytes.copyFrom(uPtr->input_scan(), uPtr->input_remaining());
259 return env->NewDirectByteBuffer(remaining_bytes.ptr, remaining_bytes.len);
260 }
261 }
262
263 JNIEXPORT jlong JNICALL
264 Java_com_sun_java_util_jar_pack_NativeUnpack_finish(JNIEnv *env, jobject pObj) {
265 unpacker* uPtr = get_unpacker(env, pObj, false);
266 if (uPtr == null) return 0;
267 size_t consumed = uPtr->input_consumed();
268 free_unpacker(env, pObj, uPtr);
269 return consumed;
270 }
271
272 JNIEXPORT jboolean JNICALL
273 Java_com_sun_java_util_jar_pack_NativeUnpack_setOption(JNIEnv *env, jobject pObj,
274 jstring pProp, jstring pValue) {
275 unpacker* uPtr = get_unpacker(env, pObj);
276 const char* prop = env->GetStringUTFChars(pProp, JNI_FALSE);
277 const char* value = env->GetStringUTFChars(pValue, JNI_FALSE);
278 jboolean retval = uPtr->set_option(prop, value);
279 env->ReleaseStringUTFChars(pProp, prop);
280 env->ReleaseStringUTFChars(pValue, value);
281 return retval;
282 }
283
284 JNIEXPORT jstring JNICALL
285 Java_com_sun_java_util_jar_pack_NativeUnpack_getOption(JNIEnv *env, jobject pObj,
286 jstring pProp) {
287
288 unpacker* uPtr = get_unpacker(env, pObj);
289 const char* prop = env->GetStringUTFChars(pProp, JNI_FALSE);
290 const char* value = uPtr->get_option(prop);
291 env->ReleaseStringUTFChars(pProp, prop);
292 if (value == null) return null;
293 return env->NewStringUTF(value);
294 }