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/**
* 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
*
* https://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 "Zigzag.hh"
namespace avro {
uint64_t
encodeZigzag64(int64_t input)
{
// cppcheck-suppress shiftTooManyBitsSigned
return ((input << 1) ^ (input >> 63));
}
int64_t
decodeZigzag64(uint64_t input)
{
return static_cast<int64_t>(((input >> 1) ^ -(static_cast<int64_t>(input) & 1)));
}
uint32_t
encodeZigzag32(int32_t input)
{
// cppcheck-suppress shiftTooManyBitsSigned
return ((input << 1) ^ (input >> 31));
}
int32_t
decodeZigzag32(uint32_t input)
{
return static_cast<int32_t>(((input >> 1) ^ -(static_cast<int64_t>(input) & 1)));
}
size_t
encodeInt64(int64_t input, std::array<uint8_t, 10> &output)
{
// get the zigzag encoding
uint64_t val = encodeZigzag64(input);
// put values in an array of bytes with variable length encoding
const int mask = 0x7F;
output[0] = val & mask;
size_t bytesOut = 1;
while( val >>=7 ) {
output[bytesOut-1] |= 0x80;
output[bytesOut++] = (val & mask);
}
return bytesOut;
}
size_t
encodeInt32(int32_t input, std::array<uint8_t, 5> &output)
{
// get the zigzag encoding
uint32_t val = encodeZigzag32(input);
// put values in an array of bytes with variable length encoding
const int mask = 0x7F;
output[0] = val & mask;
size_t bytesOut = 1;
while( val >>=7 ) {
output[bytesOut-1] |= 0x80;
output[bytesOut++] = (val & mask);
}
return bytesOut;
}
} // namespace avro
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