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/*
* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* Native method support for java.util.zip.Deflater
*/
#include <stdio.h>
#include <stdlib.h>
#include <nativehelper/JNIHelp.h>
#include "jlong.h"
#include "jni.h"
#include "jni_util.h"
#include <zlib.h>
#define NATIVE_METHOD(className, functionName, signature) \
{ #functionName, signature, (void*)(className ## _ ## functionName) }
#define DEF_MEM_LEVEL 8
static jfieldID levelID;
static jfieldID strategyID;
static jfieldID setParamsID;
static jfieldID finishID;
static jfieldID finishedID;
static jfieldID bufID, offID, lenID;
static void Deflater_initIDs(JNIEnv *env) {
jclass cls = (*env)->FindClass(env, "java/util/zip/Deflater");
levelID = (*env)->GetFieldID(env, cls, "level", "I");
strategyID = (*env)->GetFieldID(env, cls, "strategy", "I");
setParamsID = (*env)->GetFieldID(env, cls, "setParams", "Z");
finishID = (*env)->GetFieldID(env, cls, "finish", "Z");
finishedID = (*env)->GetFieldID(env, cls, "finished", "Z");
bufID = (*env)->GetFieldID(env, cls, "buf", "[B");
offID = (*env)->GetFieldID(env, cls, "off", "I");
lenID = (*env)->GetFieldID(env, cls, "len", "I");
}
JNIEXPORT jlong JNICALL
Deflater_init(JNIEnv *env, jclass cls, jint level,
jint strategy, jboolean nowrap)
{
z_stream *strm = calloc(1, sizeof(z_stream));
if (strm == 0) {
JNU_ThrowOutOfMemoryError(env, 0);
return jlong_zero;
} else {
const char *msg;
int ret = deflateInit2(strm, level, Z_DEFLATED,
nowrap ? -MAX_WBITS : MAX_WBITS,
DEF_MEM_LEVEL, strategy);
switch (ret) {
case Z_OK:
return ptr_to_jlong(strm);
case Z_MEM_ERROR:
free(strm);
JNU_ThrowOutOfMemoryError(env, 0);
return jlong_zero;
case Z_STREAM_ERROR:
free(strm);
JNU_ThrowIllegalArgumentException(env, 0);
return jlong_zero;
default:
msg = ((strm->msg != NULL) ? strm->msg :
(ret == Z_VERSION_ERROR) ?
"zlib returned Z_VERSION_ERROR: "
"compile time and runtime zlib implementations differ" :
"unknown error initializing zlib library");
free(strm);
JNU_ThrowInternalError(env, msg);
return jlong_zero;
}
}
}
JNIEXPORT void JNICALL
Deflater_setDictionary(JNIEnv *env, jclass cls, jlong addr,
jarray b, jint off, jint len)
{
Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
int res;
if (buf == 0) {/* out of memory */
return;
}
res = deflateSetDictionary((z_stream *)jlong_to_ptr(addr), buf + off, len);
(*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
switch (res) {
case Z_OK:
break;
case Z_STREAM_ERROR:
JNU_ThrowIllegalArgumentException(env, 0);
break;
default:
JNU_ThrowInternalError(env, ((z_stream *)jlong_to_ptr(addr))->msg);
break;
}
}
JNIEXPORT jint JNICALL
Deflater_deflateBytes(JNIEnv *env, jobject this, jlong addr,
jarray b, jint off, jint len, jint flush)
{
z_stream *strm = jlong_to_ptr(addr);
jarray this_buf = (*env)->GetObjectField(env, this, bufID);
jint this_off = (*env)->GetIntField(env, this, offID);
jint this_len = (*env)->GetIntField(env, this, lenID);
jbyte *in_buf;
jbyte *out_buf;
int res;
if ((*env)->GetBooleanField(env, this, setParamsID)) {
int level = (*env)->GetIntField(env, this, levelID);
int strategy = (*env)->GetIntField(env, this, strategyID);
in_buf = (*env)->GetPrimitiveArrayCritical(env, this_buf, 0);
if (in_buf == NULL) {
// Throw OOME only when length is not zero
if (this_len != 0)
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
out_buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
if (out_buf == NULL) {
(*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0);
if (len != 0)
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
strm->next_in = (Bytef *) (in_buf + this_off);
strm->next_out = (Bytef *) (out_buf + off);
strm->avail_in = this_len;
strm->avail_out = len;
res = deflateParams(strm, level, strategy);
(*env)->ReleasePrimitiveArrayCritical(env, b, out_buf, 0);
(*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0);
switch (res) {
case Z_OK:
(*env)->SetBooleanField(env, this, setParamsID, JNI_FALSE);
this_off += this_len - strm->avail_in;
(*env)->SetIntField(env, this, offID, this_off);
(*env)->SetIntField(env, this, lenID, strm->avail_in);
return len - strm->avail_out;
case Z_BUF_ERROR:
(*env)->SetBooleanField(env, this, setParamsID, JNI_FALSE);
return 0;
default:
JNU_ThrowInternalError(env, strm->msg);
return 0;
}
} else {
jboolean finish = (*env)->GetBooleanField(env, this, finishID);
in_buf = (*env)->GetPrimitiveArrayCritical(env, this_buf, 0);
if (in_buf == NULL) {
if (this_len != 0)
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
out_buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
if (out_buf == NULL) {
(*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0);
if (len != 0)
JNU_ThrowOutOfMemoryError(env, 0);
return 0;
}
strm->next_in = (Bytef *) (in_buf + this_off);
strm->next_out = (Bytef *) (out_buf + off);
strm->avail_in = this_len;
strm->avail_out = len;
res = deflate(strm, finish ? Z_FINISH : flush);
(*env)->ReleasePrimitiveArrayCritical(env, b, out_buf, 0);
(*env)->ReleasePrimitiveArrayCritical(env, this_buf, in_buf, 0);
switch (res) {
case Z_STREAM_END:
(*env)->SetBooleanField(env, this, finishedID, JNI_TRUE);
/* fall through */
case Z_OK:
this_off += this_len - strm->avail_in;
(*env)->SetIntField(env, this, offID, this_off);
(*env)->SetIntField(env, this, lenID, strm->avail_in);
return len - strm->avail_out;
case Z_BUF_ERROR:
return 0;
default:
JNU_ThrowInternalError(env, strm->msg);
return 0;
}
}
}
JNIEXPORT jint JNICALL
Deflater_getAdler(JNIEnv *env, jclass cls, jlong addr)
{
return ((z_stream *)jlong_to_ptr(addr))->adler;
}
JNIEXPORT void JNICALL
Deflater_reset(JNIEnv *env, jclass cls, jlong addr)
{
if (deflateReset((z_stream *)jlong_to_ptr(addr)) != Z_OK) {
JNU_ThrowInternalError(env, 0);
}
}
JNIEXPORT void JNICALL
Deflater_end(JNIEnv *env, jclass cls, jlong addr)
{
if (deflateEnd((z_stream *)jlong_to_ptr(addr)) == Z_STREAM_ERROR) {
JNU_ThrowInternalError(env, 0);
} else {
free((z_stream *)jlong_to_ptr(addr));
}
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(Deflater, init, "(IIZ)J"),
NATIVE_METHOD(Deflater, setDictionary, "(J[BII)V"),
NATIVE_METHOD(Deflater, deflateBytes, "(J[BIII)I"),
NATIVE_METHOD(Deflater, getAdler, "(J)I"),
NATIVE_METHOD(Deflater, reset, "(J)V"),
NATIVE_METHOD(Deflater, end, "(J)V"),
};
void register_java_util_zip_Deflater(JNIEnv* env) {
jniRegisterNativeMethods(env, "java/util/zip/Deflater", gMethods, NELEM(gMethods));
Deflater_initIDs(env);
}
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