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      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one or more
      3  * contributor license agreements.  See the NOTICE file distributed with
      4  * this work for additional information regarding copyright ownership.
      5  * The ASF licenses this file to You under the Apache License, Version 2.0
      6  * (the "License"); you may not use this file except in compliance with
      7  * the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 #if !defined(zip_h)
     19 #define zip_h
     20 
     21 #include "JNIHelp.h"
     22 #include "JniException.h"
     23 #include "UniquePtr.h"
     24 #include "jni.h"
     25 #include "zlib.h"
     26 
     27 static void throwExceptionForZlibError(JNIEnv* env, const char* exceptionClassName, int error) {
     28     if (error == Z_MEM_ERROR) {
     29         jniThrowOutOfMemoryError(env, NULL);
     30     } else {
     31         jniThrowException(env, exceptionClassName, zError(error));
     32     }
     33 }
     34 
     35 class NativeZipStream {
     36 public:
     37     UniquePtr<jbyte[]> input;
     38     int inCap;
     39     z_stream stream;
     40 
     41     NativeZipStream() : input(NULL), inCap(0), mDict(NULL) {
     42         // Let zlib use its default allocator.
     43         stream.opaque = Z_NULL;
     44         stream.zalloc = Z_NULL;
     45         stream.zfree = Z_NULL;
     46     }
     47 
     48     ~NativeZipStream() {
     49     }
     50 
     51     void setDictionary(JNIEnv* env, jbyteArray javaDictionary, int off, int len, bool inflate) {
     52         UniquePtr<jbyte[]> dictionaryBytes(new jbyte[len]);
     53         if (dictionaryBytes.get() == NULL) {
     54             jniThrowOutOfMemoryError(env, NULL);
     55             return;
     56         }
     57         env->GetByteArrayRegion(javaDictionary, off, len, &dictionaryBytes[0]);
     58         const Bytef* dictionary = reinterpret_cast<const Bytef*>(&dictionaryBytes[0]);
     59         int err;
     60         if (inflate) {
     61             err = inflateSetDictionary(&stream, dictionary, len);
     62         } else {
     63             err = deflateSetDictionary(&stream, dictionary, len);
     64         }
     65         if (err != Z_OK) {
     66             throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err);
     67             return;
     68         }
     69         mDict.reset(dictionaryBytes.release());
     70     }
     71 
     72     void setInput(JNIEnv* env, jbyteArray buf, jint off, jint len) {
     73         input.reset(new jbyte[len]);
     74         if (input.get() == NULL) {
     75             inCap = 0;
     76             jniThrowOutOfMemoryError(env, NULL);
     77             return;
     78         }
     79         inCap = len;
     80         if (buf != NULL) {
     81             env->GetByteArrayRegion(buf, off, len, &input[0]);
     82         }
     83         stream.next_in = reinterpret_cast<Bytef*>(&input[0]);
     84         stream.avail_in = len;
     85     }
     86 
     87 private:
     88     UniquePtr<jbyte[]> mDict;
     89 
     90     // Disallow copy and assignment.
     91     NativeZipStream(const NativeZipStream&);
     92     void operator=(const NativeZipStream&);
     93 };
     94 
     95 static NativeZipStream* toNativeZipStream(jlong address) {
     96     return reinterpret_cast<NativeZipStream*>(static_cast<uintptr_t>(address));
     97 }
     98 
     99 #endif /* zip_h */
    100