github.com/apache/arrow/go/v14@v14.0.1/parquet/internal/utils/_lib/unpack_bool.c

// 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
//
// 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 <arch.h>
#include <stdbool.h>
#include <stdint.h>

void FULL_NAME(bytes_to_bools)(const uint8_t bytes[], const int len, bool out[], const int outlen) {
  for (int i = 0; i < len; i++) {
    for (int j = 0; j < 8; j++) {
      int idx = 8*i+j;
      if (idx >= outlen) { break; }
      out[idx] = (bytes[i] & (1 << j)) != 0;
    }
  }
}