lang/c++/impl/Zigzag.cc

/**
 * 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 {
// TODO: The following two functions have exactly the same code except for the type.
// They should be implemented as a template.
size_t
encodeInt64(int64_t input, std::array<uint8_t, 10> &output) noexcept {
    auto val = encodeZigzag64(input);

    // put values in an array of bytes with variable length encoding
    const int mask = 0x7F;
    auto v = val & mask;
    size_t bytesOut = 0;
    while (val >>= 7) {
        output[bytesOut++] = (v | 0x80);
        v = val & mask;
    }

    output[bytesOut++] = v;
    return bytesOut;
}
size_t
encodeInt32(int32_t input, std::array<uint8_t, 5> &output) noexcept {
    auto val = encodeZigzag32(input);

    // put values in an array of bytes with variable length encoding
    const int mask = 0x7F;
    auto v = val & mask;
    size_t bytesOut = 0;
    while (val >>= 7) {
        output[bytesOut++] = (v | 0x80);
        v = val & mask;
    }

    output[bytesOut++] = v;
    return bytesOut;
}

} // namespace avro