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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed 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 "CompressionEngine.h"
#include <limits>
#include <android-base/logging.h>
#include <zlib.h>
#include <zstd.h>
CompressionEngine& CompressionEngine::GetInstance() {
static CompressionEngine* engine = new ZstdCompressionEngine();
return *engine;
}
bool ZlibCompressionEngine::Compress(SerializedData& in, size_t data_length, SerializedData& out) {
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
int ret = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
if (ret != Z_OK) {
LOG(FATAL) << "deflateInit() failed";
}
CHECK_LE(data_length, in.size());
CHECK_LE(in.size(), std::numeric_limits<uint32_t>::max());
uint32_t deflate_bound = deflateBound(&strm, in.size());
out.Resize(deflate_bound);
strm.avail_in = data_length;
strm.next_in = in.data();
strm.avail_out = out.size();
strm.next_out = out.data();
ret = deflate(&strm, Z_FINISH);
CHECK_EQ(ret, Z_STREAM_END);
uint32_t compressed_size = strm.total_out;
deflateEnd(&strm);
out.Resize(compressed_size);
return true;
}
bool ZlibCompressionEngine::Decompress(SerializedData& in, SerializedData& out) {
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = in.size();
strm.next_in = in.data();
strm.avail_out = out.size();
strm.next_out = out.data();
inflateInit(&strm);
int ret = inflate(&strm, Z_NO_FLUSH);
CHECK_EQ(strm.avail_in, 0U);
CHECK_EQ(strm.avail_out, 0U);
CHECK_EQ(ret, Z_STREAM_END);
inflateEnd(&strm);
return true;
}
bool ZstdCompressionEngine::Compress(SerializedData& in, size_t data_length, SerializedData& out) {
CHECK_LE(data_length, in.size());
size_t compress_bound = ZSTD_compressBound(data_length);
out.Resize(compress_bound);
size_t out_size = ZSTD_compress(out.data(), out.size(), in.data(), data_length, 1);
if (ZSTD_isError(out_size)) {
LOG(FATAL) << "ZSTD_compress failed: " << ZSTD_getErrorName(out_size);
}
out.Resize(out_size);
return true;
}
bool ZstdCompressionEngine::Decompress(SerializedData& in, SerializedData& out) {
size_t result = ZSTD_decompress(out.data(), out.size(), in.data(), in.size());
if (ZSTD_isError(result)) {
LOG(FATAL) << "ZSTD_decompress failed: " << ZSTD_getErrorName(result);
}
CHECK_EQ(result, out.size());
return true;
}
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