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105 lines
3.0 KiB
105 lines
3.0 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "CompressionEngine.h"
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#include <limits>
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#include <android-base/logging.h>
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#include <zlib.h>
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#include <zstd.h>
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CompressionEngine& CompressionEngine::GetInstance() {
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static CompressionEngine* engine = new ZstdCompressionEngine();
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return *engine;
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}
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bool ZlibCompressionEngine::Compress(SerializedData& in, size_t data_length, SerializedData& out) {
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z_stream strm;
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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int ret = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
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if (ret != Z_OK) {
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LOG(FATAL) << "deflateInit() failed";
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}
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CHECK_LE(data_length, in.size());
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CHECK_LE(in.size(), std::numeric_limits<uint32_t>::max());
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uint32_t deflate_bound = deflateBound(&strm, in.size());
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out.Resize(deflate_bound);
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strm.avail_in = data_length;
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strm.next_in = in.data();
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strm.avail_out = out.size();
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strm.next_out = out.data();
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ret = deflate(&strm, Z_FINISH);
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CHECK_EQ(ret, Z_STREAM_END);
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uint32_t compressed_size = strm.total_out;
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deflateEnd(&strm);
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out.Resize(compressed_size);
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return true;
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}
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bool ZlibCompressionEngine::Decompress(SerializedData& in, SerializedData& out) {
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z_stream strm;
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = in.size();
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strm.next_in = in.data();
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strm.avail_out = out.size();
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strm.next_out = out.data();
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inflateInit(&strm);
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int ret = inflate(&strm, Z_NO_FLUSH);
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CHECK_EQ(strm.avail_in, 0U);
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CHECK_EQ(strm.avail_out, 0U);
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CHECK_EQ(ret, Z_STREAM_END);
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inflateEnd(&strm);
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return true;
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}
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bool ZstdCompressionEngine::Compress(SerializedData& in, size_t data_length, SerializedData& out) {
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CHECK_LE(data_length, in.size());
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size_t compress_bound = ZSTD_compressBound(data_length);
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out.Resize(compress_bound);
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size_t out_size = ZSTD_compress(out.data(), out.size(), in.data(), data_length, 1);
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if (ZSTD_isError(out_size)) {
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LOG(FATAL) << "ZSTD_compress failed: " << ZSTD_getErrorName(out_size);
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}
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out.Resize(out_size);
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return true;
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}
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bool ZstdCompressionEngine::Decompress(SerializedData& in, SerializedData& out) {
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size_t result = ZSTD_decompress(out.data(), out.size(), in.data(), in.size());
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if (ZSTD_isError(result)) {
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LOG(FATAL) << "ZSTD_decompress failed: " << ZSTD_getErrorName(result);
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}
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CHECK_EQ(result, out.size());
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return true;
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}
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