| /** |
| * 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 |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #include "CompressionCodecZLib.h" |
| |
| #include <zlib.h> |
| #include <cstring> |
| #include <cstdlib> |
| #include <cmath> |
| #include "LogUtils.h" |
| |
| DECLARE_LOG_OBJECT() |
| |
| namespace pulsar { |
| |
| SharedBuffer CompressionCodecZLib::encode(const SharedBuffer &raw) { |
| // Get the max size of the compressed data and allocate a buffer to hold it |
| int maxCompressedSize = compressBound(raw.readableBytes()); |
| SharedBuffer compressed = SharedBuffer::allocate(maxCompressedSize); |
| |
| unsigned long bytesWritten = maxCompressedSize; |
| int res = compress((Bytef *)compressed.mutableData(), &bytesWritten, (const Bytef *)raw.data(), |
| raw.readableBytes()); |
| if (res != Z_OK) { |
| LOG_ERROR("Failed to compress buffer. res=" << res); |
| abort(); |
| } |
| |
| compressed.bytesWritten(bytesWritten); |
| return compressed; |
| } |
| |
| static bool buffer_uncompress(const char *compressedBuffer, unsigned long compressedSize, char *resultBuffer, |
| uint32_t uncompressedSize) { |
| z_stream stream; |
| stream.next_in = (Bytef *)compressedBuffer; |
| stream.avail_in = compressedSize; |
| stream.zalloc = NULL; |
| stream.zfree = NULL; |
| stream.opaque = NULL; |
| |
| int res = inflateInit2(&stream, MAX_WBITS); |
| if (res != Z_OK) { |
| LOG_ERROR("Failed to initialize inflate stream: " << res); |
| return false; |
| } |
| |
| stream.next_out = (Bytef *)resultBuffer; |
| stream.avail_out = uncompressedSize; |
| |
| res = inflate(&stream, Z_PARTIAL_FLUSH); |
| inflateEnd(&stream); |
| |
| if (res == Z_OK || res == Z_STREAM_END) { |
| return true; |
| } else { |
| LOG_ERROR("Failed to decompress zlib buffer: " << res << " -- compressed size: " << compressedSize |
| << " -- uncompressed size: " << uncompressedSize); |
| return false; |
| } |
| } |
| |
| bool CompressionCodecZLib::decode(const SharedBuffer &encoded, uint32_t uncompressedSize, |
| SharedBuffer &decoded) { |
| SharedBuffer decompressed = SharedBuffer::allocate(uncompressedSize); |
| |
| if (buffer_uncompress(encoded.data(), encoded.readableBytes(), decompressed.mutableData(), |
| uncompressedSize)) { |
| decoded = decompressed; |
| decoded.setWriterIndex(uncompressedSize); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } // namespace pulsar |