1 /*
   2  * Copyright (c) 1997, 2019, 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 JNIEXPORT jlong JNICALL
  42 Java_java_util_zip_Deflater_init(JNIEnv *env, jclass cls, jint level,
  43                                  jint strategy, jboolean nowrap)
  44 {
  45     z_stream *strm = calloc(1, sizeof(z_stream));
  46 
  47     if (strm == 0) {
  48         JNU_ThrowOutOfMemoryError(env, 0);
  49         return jlong_zero;
  50     } else {
  51         const char *msg;
  52         int ret = deflateInit2(strm, level, Z_DEFLATED,
  53                                nowrap ? -MAX_WBITS : MAX_WBITS,
  54                                DEF_MEM_LEVEL, strategy);
  55         switch (ret) {
  56           case Z_OK:
  57             return ptr_to_jlong(strm);
  58           case Z_MEM_ERROR:
  59             free(strm);
  60             JNU_ThrowOutOfMemoryError(env, 0);
  61             return jlong_zero;
  62           case Z_STREAM_ERROR:
  63             free(strm);
  64             JNU_ThrowIllegalArgumentException(env, 0);
  65             return jlong_zero;
  66           default:
  67             msg = ((strm->msg != NULL) ? strm->msg :
  68                    (ret == Z_VERSION_ERROR) ?
  69                    "zlib returned Z_VERSION_ERROR: "
  70                    "compile time and runtime zlib implementations differ" :
  71                    "unknown error initializing zlib library");
  72             free(strm);
  73             JNU_ThrowInternalError(env, msg);
  74             return jlong_zero;
  75         }
  76     }
  77 }
  78 
  79 static void checkSetDictionaryResult(JNIEnv *env, jlong addr, jint res)
  80 {
  81     switch (res) {
  82     case Z_OK:
  83         break;
  84     case Z_STREAM_ERROR:
  85         JNU_ThrowIllegalArgumentException(env, 0);
  86         break;
  87     default:
  88         JNU_ThrowInternalError(env, ((z_stream *)jlong_to_ptr(addr))->msg);
  89         break;
  90     }
  91 }
  92 
  93 JNIEXPORT void JNICALL
  94 Java_java_util_zip_Deflater_setDictionary(JNIEnv *env, jclass cls, jlong addr,
  95                                           jbyteArray b, jint off, jint len)
  96 {
  97     int res;
  98     Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
  99     if (buf == NULL) /* out of memory */
 100         return;
 101     res = deflateSetDictionary(jlong_to_ptr(addr), buf, len);
 102     (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
 103     checkSetDictionaryResult(env, addr, res);
 104 }
 105 
 106 JNIEXPORT void JNICALL
 107 Java_java_util_zip_Deflater_setDictionaryBuffer(JNIEnv *env, jclass cls, jlong addr,
 108                                           jlong bufferAddr, jint len)
 109 {
 110     int res;
 111     Bytef *buf = jlong_to_ptr(bufferAddr);
 112     res = deflateSetDictionary(jlong_to_ptr(addr), buf, len);
 113     checkSetDictionaryResult(env, addr, res);
 114 }
 115 
 116 static jint doDeflate(JNIEnv *env, jlong addr,
 117                        jbyte *input, jint inputLen,
 118                        jbyte *output, jint outputLen,
 119                        jint flush, jint params)
 120 {
 121     z_stream *strm = jlong_to_ptr(addr);
 122     int setParams = params & 1;
 123     int res;
 124 
 125     strm->next_in  = (Bytef *) input;
 126     strm->next_out = (Bytef *) output;
 127     strm->avail_in  = inputLen;
 128     strm->avail_out = outputLen;
 129 
 130     if (setParams) {
 131         int strategy = (params >> 1) & 3;
 132         int level = params >> 3;
 133         res = deflateParams(strm, level, strategy);
 134     } else {
 135         res = deflate(strm, flush);
 136     }
 137     return res;
 138 }
 139 
 140 static jlong checkDeflateStatus(JNIEnv *env, jlong addr,
 141                         jint inputLen,
 142                         jint outputLen,
 143                         jint params, int res)
 144 {
 145     z_stream *strm = jlong_to_ptr(addr);
 146     jint inputUsed = 0, outputUsed = 0;
 147     int finished = 0;
 148     int setParams = params & 1;
 149 
 150     if (setParams) {
 151         switch (res) {
 152         case Z_OK:
 153             setParams = 0;
 154             /* fall through */
 155         case Z_BUF_ERROR:
 156             inputUsed = inputLen - strm->avail_in;
 157             outputUsed = outputLen - strm->avail_out;
 158             break;
 159         default:
 160             JNU_ThrowInternalError(env, strm->msg);
 161             return 0;
 162         }
 163     } else {
 164         switch (res) {
 165         case Z_STREAM_END:
 166             finished = 1;
 167             /* fall through */
 168         case Z_OK:
 169         case Z_BUF_ERROR:
 170             inputUsed = inputLen - strm->avail_in;
 171             outputUsed = outputLen - strm->avail_out;
 172             break;
 173         default:
 174             JNU_ThrowInternalError(env, strm->msg);
 175             return 0;
 176         }
 177     }
 178     return ((jlong)inputUsed) | (((jlong)outputUsed) << 31) | (((jlong)finished) << 62) | (((jlong)setParams) << 63);
 179 }
 180 
 181 JNIEXPORT jlong JNICALL
 182 Java_java_util_zip_Deflater_deflateBytesBytes(JNIEnv *env, jobject this, jlong addr,
 183                                          jbyteArray inputArray, jint inputOff, jint inputLen,
 184                                          jbyteArray outputArray, jint outputOff, jint outputLen,
 185                                          jint flush, jint params)
 186 {
 187     jbyte *input = (*env)->GetPrimitiveArrayCritical(env, inputArray, 0);
 188     jbyte *output;
 189     jlong retVal;
 190     jint res;
 191 
 192     if (input == NULL) {
 193         if (inputLen != 0 && (*env)->ExceptionOccurred(env) == NULL)
 194             JNU_ThrowOutOfMemoryError(env, 0);
 195         return 0L;
 196     }
 197     output = (*env)->GetPrimitiveArrayCritical(env, outputArray, 0);
 198     if (output == NULL) {
 199         (*env)->ReleasePrimitiveArrayCritical(env, inputArray, input, 0);
 200         if (outputLen != 0 && (*env)->ExceptionOccurred(env) == NULL)
 201             JNU_ThrowOutOfMemoryError(env, 0);
 202         return 0L;
 203     }
 204 
 205      res = doDeflate(env, addr, input + inputOff, inputLen,output + outputOff,
 206                      outputLen, flush, params);
 207 
 208     (*env)->ReleasePrimitiveArrayCritical(env, outputArray, output, 0);
 209     (*env)->ReleasePrimitiveArrayCritical(env, inputArray, input, 0);
 210 
 211     retVal = checkDeflateStatus(env, addr, inputLen, outputLen, params, res);
 212     return retVal;
 213 }
 214 
 215 
 216 JNIEXPORT jlong JNICALL
 217 Java_java_util_zip_Deflater_deflateBytesBuffer(JNIEnv *env, jobject this, jlong addr,
 218                                          jbyteArray inputArray, jint inputOff, jint inputLen,
 219                                          jlong outputBuffer, jint outputLen,
 220                                          jint flush, jint params)
 221 {
 222     jbyte *input = (*env)->GetPrimitiveArrayCritical(env, inputArray, 0);
 223     jbyte *output;
 224     jlong retVal;
 225     jint res;
 226     if (input == NULL) {
 227         if (inputLen != 0 && (*env)->ExceptionOccurred(env) == NULL)
 228             JNU_ThrowOutOfMemoryError(env, 0);
 229         return 0L;
 230     }
 231     output = jlong_to_ptr(outputBuffer);
 232 
 233     res = doDeflate(env, addr, input + inputOff, inputLen, output, outputLen,
 234                     flush, params);
 235 
 236     (*env)->ReleasePrimitiveArrayCritical(env, inputArray, input, 0);
 237 
 238     retVal = checkDeflateStatus(env, addr, inputLen, outputLen, params, res);
 239     return retVal;
 240 }
 241 
 242 JNIEXPORT jlong JNICALL
 243 Java_java_util_zip_Deflater_deflateBufferBytes(JNIEnv *env, jobject this, jlong addr,
 244                                          jlong inputBuffer, jint inputLen,
 245                                          jbyteArray outputArray, jint outputOff, jint outputLen,
 246                                          jint flush, jint params)
 247 {
 248     jbyte *input = jlong_to_ptr(inputBuffer);
 249     jbyte *output = (*env)->GetPrimitiveArrayCritical(env, outputArray, 0);
 250     jlong retVal;
 251     jint res;
 252     if (output == NULL) {
 253         if (outputLen != 0 && (*env)->ExceptionOccurred(env) == NULL)
 254             JNU_ThrowOutOfMemoryError(env, 0);
 255         return 0L;
 256     }
 257 
 258     res = doDeflate(env, addr, input, inputLen, output + outputOff, outputLen,
 259                     flush, params);
 260     (*env)->ReleasePrimitiveArrayCritical(env, outputArray, input, 0);
 261 
 262     retVal = checkDeflateStatus(env, addr, inputLen, outputLen, params, res);
 263     return retVal;
 264 }
 265 
 266 JNIEXPORT jlong JNICALL
 267 Java_java_util_zip_Deflater_deflateBufferBuffer(JNIEnv *env, jobject this, jlong addr,
 268                                          jlong inputBuffer, jint inputLen,
 269                                          jlong outputBuffer, jint outputLen,
 270                                          jint flush, jint params)
 271 {
 272     jbyte *input = jlong_to_ptr(inputBuffer);
 273     jbyte *output = jlong_to_ptr(outputBuffer);
 274     jlong retVal;
 275     jint res;
 276 
 277     res = doDeflate(env, addr, input, inputLen, output, outputLen, flush, params);
 278     retVal = checkDeflateStatus(env, addr, inputLen, outputLen, params, res);
 279     return retVal;
 280 }
 281 
 282 JNIEXPORT jint JNICALL
 283 Java_java_util_zip_Deflater_getAdler(JNIEnv *env, jclass cls, jlong addr)
 284 {
 285     return ((z_stream *)jlong_to_ptr(addr))->adler;
 286 }
 287 
 288 JNIEXPORT void JNICALL
 289 Java_java_util_zip_Deflater_reset(JNIEnv *env, jclass cls, jlong addr)
 290 {
 291     if (deflateReset((z_stream *)jlong_to_ptr(addr)) != Z_OK) {
 292         JNU_ThrowInternalError(env, 0);
 293     }
 294 }
 295 
 296 JNIEXPORT void JNICALL
 297 Java_java_util_zip_Deflater_end(JNIEnv *env, jclass cls, jlong addr)
 298 {
 299     if (deflateEnd((z_stream *)jlong_to_ptr(addr)) == Z_STREAM_ERROR) {
 300         JNU_ThrowInternalError(env, 0);
 301     } else {
 302         free((z_stream *)jlong_to_ptr(addr));
 303     }
 304 }