// Copyright 2021 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "f2fs_layout.h"
#include "third_party/ext2_hash/hash.h"

namespace f2fs {

f2fs_hash_t DentryHash(const char *name, int len) {
  uint32_t hash, minor_hash;
  f2fs_hash_t f2fs_hash;
  const char *p;
  uint32_t in[8], buf[4];

  /* Initialize the default seed for the hash checksum functions */
  buf[0] = 0x67452301;
  buf[1] = 0xefcdab89;
  buf[2] = 0x98badcfe;
  buf[3] = 0x10325476;

  p = name;
  while (len > 0) {
    Str2HashBuf(p, len, in, 4);
    TEATransform(buf, in);
    len -= 16;
    p += 16;
  }
  hash = buf[0];
  minor_hash = buf[1];

  f2fs_hash = hash;
  f2fs_hash &= ~kHashColBit;
  return f2fs_hash;
}

}  // namespace f2fs