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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "config.h"
#include "org_apache_hadoop.h"
#include "org_apache_hadoop_io_compress_lz4_Lz4Compressor.h"
// Simple Functions
extern int LZ4_compress (const char* source, char* dest, int isize);
LZ4_compress() :
return : the number of bytes in compressed buffer dest
note : destination buffer must be already allocated.
To avoid any problem, size it to handle worst cases situations (input data not compressible)
Worst case size is : "inputsize + 0.4%", with "0.4%" being at least 8 bytes.
static jfieldID Lz4Compressor_clazz;
static jfieldID Lz4Compressor_uncompressedDirectBuf;
static jfieldID Lz4Compressor_uncompressedDirectBufLen;
static jfieldID Lz4Compressor_compressedDirectBuf;
static jfieldID Lz4Compressor_directBufferSize;
JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_initIDs
(JNIEnv *env, jclass clazz){
Lz4Compressor_clazz = (*env)->GetStaticFieldID(env, clazz, "clazz",
Lz4Compressor_uncompressedDirectBuf = (*env)->GetFieldID(env, clazz,
Lz4Compressor_uncompressedDirectBufLen = (*env)->GetFieldID(env, clazz,
"uncompressedDirectBufLen", "I");
Lz4Compressor_compressedDirectBuf = (*env)->GetFieldID(env, clazz,
Lz4Compressor_directBufferSize = (*env)->GetFieldID(env, clazz,
"directBufferSize", "I");
JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_compressBytesDirect
(JNIEnv *env, jobject thisj){
// Get members of Lz4Compressor
jobject clazz = (*env)->GetStaticObjectField(env, thisj, Lz4Compressor_clazz);
jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_uncompressedDirectBuf);
jint uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen);
jobject compressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_compressedDirectBuf);
jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_directBufferSize);
// Get the input direct buffer
LOCK_CLASS(env, clazz, "Lz4Compressor");
const char* uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
UNLOCK_CLASS(env, clazz, "Lz4Compressor");
if (uncompressed_bytes == 0) {
return (jint)0;
// Get the output direct buffer
LOCK_CLASS(env, clazz, "Lz4Compressor");
char* compressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
UNLOCK_CLASS(env, clazz, "Lz4Compressor");
if (compressed_bytes == 0) {
return (jint)0;
compressed_direct_buf_len = LZ4_compress(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len);
if (compressed_direct_buf_len < 0){
THROW(env, "Ljava/lang/InternalError", "LZ4_compress failed");
(*env)->SetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen, 0);
return (jint)compressed_direct_buf_len;