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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 "Inflater"
     19 
     20 #include "JniConstants.h"
     21 #include "JniException.h"
     22 #include "ScopedPrimitiveArray.h"
     23 #include "ZipUtilities.h"
     24 #include "zutil.h" // For DEF_WBITS and DEF_MEM_LEVEL.
     25 #include <errno.h>
     26 
     27 static jlong Inflater_createStream(JNIEnv* env, jobject, jboolean noHeader) {
     28     UniquePtr<NativeZipStream> jstream(new NativeZipStream);
     29     if (jstream.get() == NULL) {
     30         jniThrowOutOfMemoryError(env, NULL);
     31         return -1;
     32     }
     33     jstream->stream.adler = 1;
     34 
     35     /*
     36      * See zlib.h for documentation of the inflateInit2 windowBits parameter.
     37      *
     38      * zconf.h says the "requirements for inflate are (in bytes) 1 << windowBits
     39      * that is, 32K for windowBits=15 (default value) plus a few kilobytes
     40      * for small objects." This means that we can happily use the default
     41      * here without worrying about memory consumption.
     42      */
     43     int err = inflateInit2(&jstream->stream, noHeader ? -DEF_WBITS : DEF_WBITS);
     44     if (err != Z_OK) {
     45         throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err, jstream.get());
     46         return -1;
     47     }
     48     return reinterpret_cast<uintptr_t>(jstream.release());
     49 }
     50 
     51 static void Inflater_setInputImpl(JNIEnv* env, jobject, jbyteArray buf, jint off, jint len, jlong handle) {
     52     toNativeZipStream(handle)->setInput(env, buf, off, len);
     53 }
     54 
     55 static jint Inflater_setFileInputImpl(JNIEnv* env, jobject, jobject javaFileDescriptor, jlong off, jint len, jlong handle) {
     56     NativeZipStream* stream = toNativeZipStream(handle);
     57 
     58     // We reuse the existing native buffer if it's large enough.
     59     // TODO: benchmark.
     60     if (stream->inCap < len) {
     61         stream->setInput(env, NULL, 0, len);
     62     } else {
     63         stream->stream.next_in = reinterpret_cast<Bytef*>(&stream->input[0]);
     64         stream->stream.avail_in = len;
     65     }
     66 
     67     // As an Android-specific optimization, we read directly onto the native heap.
     68     // The original code used Java to read onto the Java heap and then called setInput(byte[]).
     69     // TODO: benchmark.
     70     int fd = jniGetFDFromFileDescriptor(env, javaFileDescriptor);
     71     int rc = TEMP_FAILURE_RETRY(lseek(fd, off, SEEK_SET));
     72     if (rc == -1) {
     73         jniThrowIOException(env, errno);
     74         return 0;
     75     }
     76     jint totalByteCount = 0;
     77     Bytef* dst = reinterpret_cast<Bytef*>(&stream->input[0]);
     78     ssize_t byteCount;
     79     while ((byteCount = TEMP_FAILURE_RETRY(read(fd, dst, len))) > 0) {
     80         dst += byteCount;
     81         len -= byteCount;
     82         totalByteCount += byteCount;
     83     }
     84     if (byteCount == -1) {
     85         jniThrowIOException(env, errno);
     86         return 0;
     87     }
     88     return totalByteCount;
     89 }
     90 
     91 static jint Inflater_inflateImpl(JNIEnv* env, jobject recv, jbyteArray buf, int off, int len, jlong handle) {
     92     NativeZipStream* stream = toNativeZipStream(handle);
     93     ScopedByteArrayRW out(env, buf);
     94     if (out.get() == NULL) {
     95         return -1;
     96     }
     97     stream->stream.next_out = reinterpret_cast<Bytef*>(out.get() + off);
     98     stream->stream.avail_out = len;
     99 
    100     Bytef* initialNextIn = stream->stream.next_in;
    101     Bytef* initialNextOut = stream->stream.next_out;
    102 
    103     int err = inflate(&stream->stream, Z_SYNC_FLUSH);
    104     switch (err) {
    105     case Z_OK:
    106         break;
    107     case Z_NEED_DICT:
    108         static jfieldID needsDictionary = env->GetFieldID(JniConstants::inflaterClass, "needsDictionary", "Z");
    109         env->SetBooleanField(recv, needsDictionary, JNI_TRUE);
    110         break;
    111     case Z_STREAM_END:
    112         static jfieldID finished = env->GetFieldID(JniConstants::inflaterClass, "finished", "Z");
    113         env->SetBooleanField(recv, finished, JNI_TRUE);
    114         break;
    115     case Z_STREAM_ERROR:
    116         return 0;
    117     default:
    118         throwExceptionForZlibError(env, "java/util/zip/DataFormatException", err, stream);
    119         return -1;
    120     }
    121 
    122     jint bytesRead = stream->stream.next_in - initialNextIn;
    123     jint bytesWritten = stream->stream.next_out - initialNextOut;
    124 
    125     static jfieldID inReadField = env->GetFieldID(JniConstants::inflaterClass, "inRead", "I");
    126     jint inReadValue = env->GetIntField(recv, inReadField);
    127     inReadValue += bytesRead;
    128     env->SetIntField(recv, inReadField, inReadValue);
    129     return bytesWritten;
    130 }
    131 
    132 static jint Inflater_getAdlerImpl(JNIEnv*, jobject, jlong handle) {
    133     return toNativeZipStream(handle)->stream.adler;
    134 }
    135 
    136 static void Inflater_endImpl(JNIEnv*, jobject, jlong handle) {
    137     NativeZipStream* stream = toNativeZipStream(handle);
    138     inflateEnd(&stream->stream);
    139     delete stream;
    140 }
    141 
    142 static void Inflater_setDictionaryImpl(JNIEnv* env, jobject, jbyteArray dict, int off, int len, jlong handle) {
    143     toNativeZipStream(handle)->setDictionary(env, dict, off, len, true);
    144 }
    145 
    146 static void Inflater_resetImpl(JNIEnv* env, jobject, jlong handle) {
    147     NativeZipStream* stream = toNativeZipStream(handle);
    148     int err = inflateReset(&stream->stream);
    149     if (err != Z_OK) {
    150         throwExceptionForZlibError(env, "java/lang/IllegalArgumentException", err, stream);
    151     }
    152 }
    153 
    154 static jlong Inflater_getTotalOutImpl(JNIEnv*, jobject, jlong handle) {
    155     return toNativeZipStream(handle)->stream.total_out;
    156 }
    157 
    158 static jlong Inflater_getTotalInImpl(JNIEnv*, jobject, jlong handle) {
    159     return toNativeZipStream(handle)->stream.total_in;
    160 }
    161 
    162 static JNINativeMethod gMethods[] = {
    163     NATIVE_METHOD(Inflater, createStream, "(Z)J"),
    164     NATIVE_METHOD(Inflater, endImpl, "(J)V"),
    165     NATIVE_METHOD(Inflater, getAdlerImpl, "(J)I"),
    166     NATIVE_METHOD(Inflater, getTotalInImpl, "(J)J"),
    167     NATIVE_METHOD(Inflater, getTotalOutImpl, "(J)J"),
    168     NATIVE_METHOD(Inflater, inflateImpl, "([BIIJ)I"),
    169     NATIVE_METHOD(Inflater, resetImpl, "(J)V"),
    170     NATIVE_METHOD(Inflater, setDictionaryImpl, "([BIIJ)V"),
    171     NATIVE_METHOD(Inflater, setFileInputImpl, "(Ljava/io/FileDescriptor;JIJ)I"),
    172     NATIVE_METHOD(Inflater, setInputImpl, "([BIIJ)V"),
    173 };
    174 void register_java_util_zip_Inflater(JNIEnv* env) {
    175     jniRegisterNativeMethods(env, "java/util/zip/Inflater", gMethods, NELEM(gMethods));
    176 }
    177