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 "ZipUtilities.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