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#include "zutil.h"
27
28static void throwExceptionForZlibError(JNIEnv* env, const char* exceptionClassName, int error) {
29    if (error == Z_MEM_ERROR) {
30        jniThrowOutOfMemoryError(env, NULL);
31    } else {
32        jniThrowException(env, exceptionClassName, zError(error));
33    }
34}
35
36class NativeZipStream {
37public:
38    UniquePtr<jbyte[]> input;
39    int inCap;
40    z_stream stream;
41
42    NativeZipStream() : input(NULL), inCap(0), mDict(NULL) {
43        // Let zlib use its default allocator.
44        stream.opaque = Z_NULL;
45        stream.zalloc = Z_NULL;
46        stream.zfree = Z_NULL;
47    }
48
49    ~NativeZipStream() {
50    }
51
52    void setDictionary(JNIEnv* env, jbyteArray javaDictionary, int off, int len, bool inflate) {
53        UniquePtr<jbyte[]> dictionaryBytes(new jbyte[len]);
54        if (dictionaryBytes.get() == NULL) {
55            jniThrowOutOfMemoryError(env, NULL);
56            return;
57        }
58        env->GetByteArrayRegion(javaDictionary, off, len, &dictionaryBytes[0]);
59        const Bytef* dictionary = reinterpret_cast<const Bytef*>(&dictionaryBytes[0]);
60        int err;
61        if (inflate) {
62            err = inflateSetDictionary(&stream, dictionary, len);
63        } else {
64            err = deflateSetDictionary(&stream, dictionary, len);
65        }
66        if (err != Z_OK) {
67            throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err);
68            return;
69        }
70        mDict.reset(dictionaryBytes.release());
71    }
72
73    void setInput(JNIEnv* env, jbyteArray buf, jint off, jint len) {
74        input.reset(new jbyte[len]);
75        if (input.get() == NULL) {
76            inCap = 0;
77            jniThrowOutOfMemoryError(env, NULL);
78            return;
79        }
80        inCap = len;
81        if (buf != NULL) {
82            env->GetByteArrayRegion(buf, off, len, &input[0]);
83        }
84        stream.next_in = reinterpret_cast<Bytef*>(&input[0]);
85        stream.avail_in = len;
86    }
87
88private:
89    UniquePtr<jbyte[]> mDict;
90
91    // Disallow copy and assignment.
92    NativeZipStream(const NativeZipStream&);
93    void operator=(const NativeZipStream&);
94};
95
96static NativeZipStream* toNativeZipStream(jlong address) {
97    return reinterpret_cast<NativeZipStream*>(static_cast<uintptr_t>(address));
98}
99
100#endif /* zip_h */
101