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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <memory>
#include "mongo/base/data_range_cursor.h"
#include "mongo/base/init.h"
#include "mongo/transport/message_compressor_registry.h"
#include "mongo/transport/message_compressor_snappy.h"
#include <snappy.h>
namespace mongo {
SnappyMessageCompressor::SnappyMessageCompressor()
: MessageCompressorBase(MessageCompressor::kSnappy) {}
std::size_t SnappyMessageCompressor::getMaxCompressedSize(size_t inputSize) {
return snappy::MaxCompressedLength(inputSize);
}
StatusWith<std::size_t> SnappyMessageCompressor::compressData(ConstDataRange input,
DataRange output) {
size_t outLength = output.length();
if (output.length() < getMaxCompressedSize(input.length())) {
return {ErrorCodes::BadValue, "Output too small for max size of compressed input"};
}
snappy::RawCompress(input.data(), input.length(), const_cast<char*>(output.data()), &outLength);
counterHitCompress(input.length(), outLength);
return {outLength};
}
StatusWith<std::size_t> SnappyMessageCompressor::decompressData(ConstDataRange input,
DataRange output) {
size_t expectedLength = 0;
if (!snappy::GetUncompressedLength(input.data(), input.length(), &expectedLength) ||
expectedLength != output.length()) {
return {ErrorCodes::BadValue, "Compressed message was invalid or corrupted"};
}
if (!snappy::RawUncompress(input.data(), input.length(), const_cast<char*>(output.data()))) {
return Status{ErrorCodes::BadValue, "Compressed message was invalid or corrupted"};
}
counterHitDecompress(input.length(), output.length());
return output.length();
}
MONGO_INITIALIZER_GENERAL(SnappyMessageCompressorInit,
("EndStartupOptionHandling"),
("AllCompressorsRegistered"))
(InitializerContext* context) {
auto& compressorRegistry = MessageCompressorRegistry::get();
compressorRegistry.registerImplementation(std::make_unique<SnappyMessageCompressor>());
}
} // namespace mongo
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