1 /* 2 * Copyright (c) 1997, 2017, 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 /* 27 * Native method support for java.util.zip.Deflater 28 */ 29 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include "jlong.h" 33 #include "jni.h" 34 #include "jni_util.h" 35 #include <zlib.h> 36 37 #include "java_util_zip_Deflater.h" 38 39 #define DEF_MEM_LEVEL 8 40 41 static jfieldID levelID; 42 static jfieldID strategyID; 43 static jfieldID setParamsID; 44 static jfieldID finishID; 45 static jfieldID finishedID; 46 static jfieldID bufID, offID, lenID; 47 48 JNIEXPORT void JNICALL 49 Java_java_util_zip_Deflater_initIDs(JNIEnv *env, jclass cls) 50 { 51 levelID = (*env)->GetFieldID(env, cls, "level", "I"); 52 CHECK_NULL(levelID); 53 strategyID = (*env)->GetFieldID(env, cls, "strategy", "I"); 54 CHECK_NULL(strategyID); 55 setParamsID = (*env)->GetFieldID(env, cls, "setParams", "Z"); 56 CHECK_NULL(setParamsID); 57 finishID = (*env)->GetFieldID(env, cls, "finish", "Z"); 58 CHECK_NULL(finishID); 59 finishedID = (*env)->GetFieldID(env, cls, "finished", "Z"); 60 CHECK_NULL(finishedID); 61 bufID = (*env)->GetFieldID(env, cls, "buf", "[B"); 62 CHECK_NULL(bufID); 63 offID = (*env)->GetFieldID(env, cls, "off", "I"); 64 CHECK_NULL(offID); 65 lenID = (*env)->GetFieldID(env, cls, "len", "I"); 66 CHECK_NULL(lenID); 67 } 68 69 JNIEXPORT jlong JNICALL 70 Java_java_util_zip_Deflater_init(JNIEnv *env, jclass cls, jint level, 71 jint strategy, jboolean nowrap) 72 { 73 z_stream *strm = calloc(1, sizeof(z_stream)); 74 75 if (strm == 0) { 76 JNU_ThrowOutOfMemoryError(env, 0); 77 return jlong_zero; 78 } else { 79 const char *msg; 80 int ret = deflateInit2(strm, level, Z_DEFLATED, 81 nowrap ? -MAX_WBITS : MAX_WBITS, 82 DEF_MEM_LEVEL, strategy); 83 switch (ret) { 84 case Z_OK: 85 return ptr_to_jlong(strm); 86 case Z_MEM_ERROR: 87 free(strm); 88 JNU_ThrowOutOfMemoryError(env, 0); 89 return jlong_zero; 90 case Z_STREAM_ERROR: 91 free(strm); 92 JNU_ThrowIllegalArgumentException(env, 0); 93 return jlong_zero; 94 default: 95 msg = ((strm->msg != NULL) ? strm->msg : 96 (ret == Z_VERSION_ERROR) ? 97 "zlib returned Z_VERSION_ERROR: " 98 "compile time and runtime zlib implementations differ" : 99 "unknown error initializing zlib library"); 100 free(strm); 101 JNU_ThrowInternalError(env, msg); 102 return jlong_zero; 103 } 104 } 105 } 106 107 JNIEXPORT void JNICALL 108 Java_java_util_zip_Deflater_setDictionary(JNIEnv *env, jclass cls, jlong addr, 109 jarray b, jint off, jint len) 110 { 111 Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0); 112 int res; 113 if (buf == 0) {/* out of memory */ 114 return; 115 } 116 res = deflateSetDictionary((z_stream *)jlong_to_ptr(addr), buf + off, len); 117 (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0); 118 switch (res) { 119 case Z_OK: 120 break; 121 case Z_STREAM_ERROR: 122 JNU_ThrowIllegalArgumentException(env, 0); 123 break; 124 default: 125 JNU_ThrowInternalError(env, ((z_stream *)jlong_to_ptr(addr))->msg); 126 break; 127 } 128 } 129 130 JNIEXPORT jint JNICALL 131 Java_java_util_zip_Deflater_deflateBytes(JNIEnv *env, jobject this, jlong addr, 132 jarray b, jint off, jint len, jint flush) 133 { 134 z_stream *strm = jlong_to_ptr(addr); 135 136 jarray this_buf = (*env)->GetObjectField(env, this, bufID); 137 jint this_off = (*env)->GetIntField(env, this, offID); 138 jint this_len = (*env)->GetIntField(env, this, lenID); 139 jbyte *in_buf; 140 jbyte *out_buf; 141 int res; 142 if ((*env)->GetBooleanField(env, this, setParamsID)) { 143 int level = (*env)->GetIntField(env, this, levelID); 144 int strategy = (*env)->GetIntField(env, this, strategyID); 145 in_buf = (*env)->GetPrimitiveArrayCritical(env, this_buf, 0); 146 if (in_buf == NULL) { 147 // Throw OOME only when length is not zero 148 if (this_len != 0 && (*env)->ExceptionOccurred(env) == NULL) 149 JNU_ThrowOutOfMemoryError(env, 0); 150 return 0; 151 } 152 out_buf = (*env)->GetPrimitiveArrayCritical(env, b, 0); 153 if (out_buf == NULL) { 154 (*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0); 155 if (len != 0 && (*env)->ExceptionOccurred(env) == NULL) 156 JNU_ThrowOutOfMemoryError(env, 0); 157 return 0; 158 } 159 160 strm->next_in = (Bytef *) (in_buf + this_off); 161 strm->next_out = (Bytef *) (out_buf + off); 162 strm->avail_in = this_len; 163 strm->avail_out = len; 164 res = deflateParams(strm, level, strategy); 165 (*env)->ReleasePrimitiveArrayCritical(env, b, out_buf, 0); 166 (*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0); 167 switch (res) { 168 case Z_OK: 169 (*env)->SetBooleanField(env, this, setParamsID, JNI_FALSE); 170 case Z_BUF_ERROR: 171 this_off += this_len - strm->avail_in; 172 (*env)->SetIntField(env, this, offID, this_off); 173 (*env)->SetIntField(env, this, lenID, strm->avail_in); 174 return (jint) (len - strm->avail_out); 175 default: 176 JNU_ThrowInternalError(env, strm->msg); 177 return 0; 178 } 179 } else { 180 jboolean finish = (*env)->GetBooleanField(env, this, finishID); 181 in_buf = (*env)->GetPrimitiveArrayCritical(env, this_buf, 0); 182 if (in_buf == NULL) { 183 if (this_len != 0) 184 JNU_ThrowOutOfMemoryError(env, 0); 185 return 0; 186 } 187 out_buf = (*env)->GetPrimitiveArrayCritical(env, b, 0); 188 if (out_buf == NULL) { 189 (*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0); 190 if (len != 0) 191 JNU_ThrowOutOfMemoryError(env, 0); 192 193 return 0; 194 } 195 196 strm->next_in = (Bytef *) (in_buf + this_off); 197 strm->next_out = (Bytef *) (out_buf + off); 198 strm->avail_in = this_len; 199 strm->avail_out = len; 200 res = deflate(strm, finish ? Z_FINISH : flush); 201 (*env)->ReleasePrimitiveArrayCritical(env, b, out_buf, 0); 202 (*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0); 203 switch (res) { 204 case Z_STREAM_END: 205 (*env)->SetBooleanField(env, this, finishedID, JNI_TRUE); 206 /* fall through */ 207 case Z_OK: 208 case Z_BUF_ERROR: 209 this_off += this_len - strm->avail_in; 210 (*env)->SetIntField(env, this, offID, this_off); 211 (*env)->SetIntField(env, this, lenID, strm->avail_in); 212 return len - strm->avail_out; 213 default: 214 JNU_ThrowInternalError(env, strm->msg); 215 return 0; 216 } 217 } 218 } 219 220 JNIEXPORT jint JNICALL 221 Java_java_util_zip_Deflater_getAdler(JNIEnv *env, jclass cls, jlong addr) 222 { 223 return ((z_stream *)jlong_to_ptr(addr))->adler; 224 } 225 226 JNIEXPORT void JNICALL 227 Java_java_util_zip_Deflater_reset(JNIEnv *env, jclass cls, jlong addr) 228 { 229 if (deflateReset((z_stream *)jlong_to_ptr(addr)) != Z_OK) { 230 JNU_ThrowInternalError(env, 0); 231 } 232 } 233 234 JNIEXPORT void JNICALL 235 Java_java_util_zip_Deflater_end(JNIEnv *env, jclass cls, jlong addr) 236 { 237 if (deflateEnd((z_stream *)jlong_to_ptr(addr)) == Z_STREAM_ERROR) { 238 JNU_ThrowInternalError(env, 0); 239 } else { 240 free((z_stream *)jlong_to_ptr(addr)); 241 } 242 }