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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 #define LOG_TAG "Deflater"
     19 
     20 #include "JniConstants.h"
     21 #include "ScopedPrimitiveArray.h"
     22 #include "zip.h"
     23 
     24 static void Deflater_setDictionaryImpl(JNIEnv* env, jobject, jbyteArray dict, int off, int len, jlong handle) {
     25     toNativeZipStream(handle)->setDictionary(env, dict, off, len, false);
     26 }
     27 
     28 static jlong Deflater_getTotalInImpl(JNIEnv*, jobject, jlong handle) {
     29     return toNativeZipStream(handle)->stream.total_in;
     30 }
     31 
     32 static jlong Deflater_getTotalOutImpl(JNIEnv*, jobject, jlong handle) {
     33     return toNativeZipStream(handle)->stream.total_out;
     34 }
     35 
     36 static jint Deflater_getAdlerImpl(JNIEnv*, jobject, jlong handle) {
     37     return toNativeZipStream(handle)->stream.adler;
     38 }
     39 
     40 static jlong Deflater_createStream(JNIEnv * env, jobject, jint level, jint strategy, jboolean noHeader) {
     41     UniquePtr<NativeZipStream> jstream(new NativeZipStream);
     42     if (jstream.get() == NULL) {
     43         jniThrowOutOfMemoryError(env, NULL);
     44         return -1;
     45     }
     46 
     47     /*
     48      * See zlib.h for documentation of the deflateInit2 windowBits and memLevel parameters.
     49      *
     50      * zconf.h says the "requirements for deflate are (in bytes):
     51      *         (1 << (windowBits+2)) +  (1 << (memLevel+9))
     52      * that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
     53      * plus a few kilobytes for small objects."
     54      */
     55     int windowBits = noHeader ? -DEF_WBITS : DEF_WBITS;
     56     int memLevel = DEF_MEM_LEVEL;
     57     int err = deflateInit2(&jstream->stream, level, Z_DEFLATED, windowBits, memLevel, strategy);
     58     if (err != Z_OK) {
     59         throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err);
     60         return -1;
     61     }
     62     return reinterpret_cast<uintptr_t>(jstream.release());
     63 }
     64 
     65 static void Deflater_setInputImpl(JNIEnv* env, jobject, jbyteArray buf, jint off, jint len, jlong handle) {
     66     toNativeZipStream(handle)->setInput(env, buf, off, len);
     67 }
     68 
     69 static jint Deflater_deflateImpl(JNIEnv* env, jobject recv, jbyteArray buf, int off, int len, jlong handle, int flushStyle) {
     70     NativeZipStream* stream = toNativeZipStream(handle);
     71     ScopedByteArrayRW out(env, buf);
     72     if (out.get() == NULL) {
     73         return -1;
     74     }
     75     stream->stream.next_out = reinterpret_cast<Bytef*>(out.get() + off);
     76     stream->stream.avail_out = len;
     77 
     78     Bytef* initialNextIn = stream->stream.next_in;
     79     Bytef* initialNextOut = stream->stream.next_out;
     80 
     81     int err = deflate(&stream->stream, flushStyle);
     82     switch (err) {
     83     case Z_OK:
     84         break;
     85     case Z_STREAM_END:
     86         static jfieldID finished = env->GetFieldID(JniConstants::deflaterClass, "finished", "Z");
     87         env->SetBooleanField(recv, finished, JNI_TRUE);
     88         break;
     89     case Z_BUF_ERROR:
     90         // zlib reports this "if no progress is possible (for example avail_in or avail_out was
     91         // zero) ... Z_BUF_ERROR is not fatal, and deflate() can be called again with more
     92         // input and more output space to continue compressing".
     93         break;
     94     default:
     95         throwExceptionForZlibError(env, "java/util/zip/DataFormatException", err);
     96         return -1;
     97     }
     98 
     99     jint bytesRead = stream->stream.next_in - initialNextIn;
    100     jint bytesWritten = stream->stream.next_out - initialNextOut;
    101 
    102     static jfieldID inReadField = env->GetFieldID(JniConstants::deflaterClass, "inRead", "I");
    103     jint inReadValue = env->GetIntField(recv, inReadField);
    104     inReadValue += bytesRead;
    105     env->SetIntField(recv, inReadField, inReadValue);
    106     return bytesWritten;
    107 }
    108 
    109 static void Deflater_endImpl(JNIEnv*, jobject, jlong handle) {
    110     NativeZipStream* stream = toNativeZipStream(handle);
    111     deflateEnd(&stream->stream);
    112     delete stream;
    113 }
    114 
    115 static void Deflater_resetImpl(JNIEnv* env, jobject, jlong handle) {
    116     NativeZipStream* stream = toNativeZipStream(handle);
    117     int err = deflateReset(&stream->stream);
    118     if (err != Z_OK) {
    119         throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err);
    120     }
    121 }
    122 
    123 static void Deflater_setLevelsImpl(JNIEnv* env, jobject, int level, int strategy, jlong handle) {
    124     NativeZipStream* stream = toNativeZipStream(handle);
    125     // The deflateParams documentation says that avail_out must never be 0 because it may be
    126     // necessary to flush, but the Java API ensures that we only get here if there's nothing
    127     // to flush. To be on the safe side, make sure that we're not pointing to a no longer valid
    128     // buffer.
    129     stream->stream.next_out = reinterpret_cast<Bytef*>(NULL);
    130     stream->stream.avail_out = 0;
    131     int err = deflateParams(&stream->stream, level, strategy);
    132     if (err != Z_OK) {
    133         throwExceptionForZlibError(env, "java/lang/IllegalStateException", err);
    134     }
    135 }
    136 
    137 static JNINativeMethod gMethods[] = {
    138     NATIVE_METHOD(Deflater, createStream, "(IIZ)J"),
    139     NATIVE_METHOD(Deflater, deflateImpl, "([BIIJI)I"),
    140     NATIVE_METHOD(Deflater, endImpl, "(J)V"),
    141     NATIVE_METHOD(Deflater, getAdlerImpl, "(J)I"),
    142     NATIVE_METHOD(Deflater, getTotalInImpl, "(J)J"),
    143     NATIVE_METHOD(Deflater, getTotalOutImpl, "(J)J"),
    144     NATIVE_METHOD(Deflater, resetImpl, "(J)V"),
    145     NATIVE_METHOD(Deflater, setDictionaryImpl, "([BIIJ)V"),
    146     NATIVE_METHOD(Deflater, setInputImpl, "([BIIJ)V"),
    147     NATIVE_METHOD(Deflater, setLevelsImpl, "(IIJ)V"),
    148 };
    149 void register_java_util_zip_Deflater(JNIEnv* env) {
    150     jniRegisterNativeMethods(env, "java/util/zip/Deflater", gMethods, NELEM(gMethods));
    151 }
    152