1// Copyright (c) 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4//
5// This is a utility executable used for generating hashes for pepper
6// interfaces for inclusion in tools/metrics/histograms/histograms.xml. Every
7// interface-version pair must have a corresponding entry in the enum there.
8//
9// The hashing logic here must match the hashing logic at
10// ppapi/proxy/interface_list.cc.
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15
16#include "base/hash.h"
17#include "base/macros.h"
18
19int main(int argc, char **argv) {
20  if (argc < 2) {
21    fprintf(stderr, "Usage: %s <interface1> <interface2> <...>\n", argv[0]);
22    fprintf(stderr, "\n");
23    fprintf(stderr, "Prints hashes for interface names.\n");
24    fprintf(stderr, "Example: %s \"PPB_Var;1.1\" \"PPB_FileIO;1.2\"\n",
25            argv[0]);
26    return 1;
27  }
28  for (int i = 1; i < argc; i++) {
29    uint32 data = base::Hash(argv[i], strlen(argv[i]));
30
31    // Strip off the signed bit because UMA doesn't support negative values,
32    // but takes a signed int as input.
33    int hash = static_cast<int>(data & 0x7fffffff);
34    printf("<int value=\"%d\" label=\"%s\"/>\n", hash, argv[i]);
35  }
36  return 0;
37}
38