b6cb992cf3
Turns out std::vector::resize() and std::vector::clear() don't actually deallocate any memory. std::vector::shrink_to_fit() can be used for this but isn't a 'guarantee'. Instead of trying to get std::vector to play nice, this change replaces std::vector<uint8_t> with std::unique_ptr<uint8_t[]>, which is more accurate to how I'm using this memory anyway. Test: logging unit tests Change-Id: I9638e90bbf50bcf316c5aa172c8278ea945d27e7
104 lines
3 KiB
C++
104 lines
3 KiB
C++
/*
|
|
* 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;
|
|
}
|